Endre søk
Begrens søket
12 1 - 50 of 57
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Treff pr side
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
Merk
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 1.
    Abdelhamid, Hani Nasser
    et al.
    Stockholm Univ, Div Mat & Environm Chem, Svante Arrhenius Väg 16 C, SE-10691 Stockholm, Sweden.;Assiut Univ, Fac Sci, Dept Chem, Adv Multifunct Mat Lab, Assiut 71515, Egypt..
    Georgouvelas, Dimitrios
    Stockholm Univ, Div Mat & Environm Chem, Svante Arrhenius Väg 16 C, SE-10691 Stockholm, Sweden..
    Edlund, Ulrica
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Polymerteknologi.
    Mathew, Aji P.
    Stockholm Univ, Div Mat & Environm Chem, Svante Arrhenius Väg 16 C, SE-10691 Stockholm, Sweden..
    CelloZIFPaper: Cellulose-ZIF hybrid paper for heavy metal removal and electrochemical sensing2022Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 446, artikkel-id 136614Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The processing of hierarchical porous zeolitic imidazolate frameworks (ZIF-8) into a cellulose paper using sheet former Rapid-Kothen (R.K.) is reported. The procedure is a promising route to overcome a significant bottleneck towards applying metal-organic frameworks (MOFs) in commercial products. ZIF-8 crystals were integrated into cellulose pulp (CP) or TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical)-oxidized cellulose nanofibrils (TOCNF) following an in-situ or ex-situ process; the materials were denoted as CelloZIFPaper_In Situ and CelloZIFPaper_Ex Situ, respectively. The materials were applied as adsorbents to remove heavy metals from water, with adsorption capacities of 66.2-354.0 mg/g. CelloZIFPaper can also be used as a stand-alone working electrode for the selective sensing of toxic heavy metals, for instance, lead ions (Pb2+), using electrochemical-based methods with a limit of detection (LOD) of 8 mu M. The electrochemical measurements may advance 'Lab-onCelloZIFPaper' technologies for label-free detection of heavy metal ions.

  • 2. Al-Sabahi, J.
    et al.
    Bora, T.
    Claereboudt, M.
    Al-Abri, M.
    Dutta, Joydeep
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    Visible light photocatalytic degradation of HPAM polymer in oil produced water using supported zinc oxide nanorods2018Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 351, s. 56-64Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Polymer flooding displacement ability during petroleum extraction from the earth's crust plays an important role in enhanced oil recovery processes. Produced water, as a byproduct, still contain high concentrations of petroleum hydrocarbons and partially hydrolyzed polyacrylamide (HPAM) which is a serious environmental concern. Remediating produced water economically is a big challenge for meeting the permissible discharge limits leading to failure in the effectiveness of the conventional water treatment technologies. Advanced oxidation processes (AOPs) are playing increasing role in the treatment of polluted water and is receiving much attention in recent times as a green and safer water treatment technology. Here we report a new approach to use vertically aligned zinc oxide nanorods (ZnO NRs) supported on substrates engineered for improving their visible light harvesting capacity for effective solar photocatalytic degradation of HPAM. The viscosity of collected oilfield produced water containing HPAM were found to be reduced dramatically when the samples are photocatalytically degraded using ZnO nanorod catalysts irradiated with simulated solar light showing a reduction of 51% within 6 h. With high pressure liquid chromatography 68, 62, 56 and 45% removal of 25, 50, 100 and 150 ppm HPAM, respectively, was demonstrated. The pH of the solution was observed to move to acidic region due to acetamide, nitrate, propionamide and acetic acid which are the intermediate byproducts formed during degradation as determined by mass spectrometry. Zinc oxide nanorod coatings showed about 74% removal efficiency over 5 cycles with less than 1.2% removal of zinc ions after 6 h of light irradiation.

  • 3.
    Al-Soubaihi, Rola
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Material- och nanofysik.
    Saoud, Khaled Mohammad
    Virginia Commonwealth Univ Qatar, Liberal Arts & Sci Program, POB 8095, Doha, Qatar..
    Dutta, Joydeep
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Material- och nanofysik.
    Low-temperature CO oxidation by silver nanoparticles in silica aerogel mesoreactors2023Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 455, s. 140576-, artikkel-id 140576Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Low-temperature carbon monoxide (CO) oxidation on silver/silica aerogel (Ag/SiO2 AG) catalyst prepared by one-pot sol-gel synthesis followed by supercritical ethanol drying method is reported. Highly stable and sinterproof catalyst led to easy reactant diffusion to the active sites. The Ag/SiO2 AG catalyst showed enhanced catalytic activity toward low-temperature CO oxidation by preventing agglomeration of silver nanoparticles inside pores and facilitating well-dispersed active sites to enhance the mass heat transfer in the mesopores. Catalyst pretreatment conditions were found to play a crucial role in achieving high CO conversion efficiency at low light-off temperatures. Inverse counter-clockwise CO oxidation hysteresis was found to occur after the first run. The active sites contributing to this enhanced catalytic behavior were confirmed to be Ag0 from XPS, XRD, and TEM analysis. The catalyst exhibited good thermal stability up to 450 degrees C over repeated number of cycles.

  • 4.
    Ashour, Radwa M.
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Funktionella material, FNM. Nuclear Materials Authority, Egypt.
    El-sayed, R.
    Abdel-Magied, A. F.
    Abdel-khalek, A. A.
    Ali, M. M.
    Forsberg, Kerstin
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik, Resursåtervinning.
    Uheida, Abdusalam
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Funktionella material, FNM.
    Muhammed, Mamoun
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Funktionella material, FNM.
    Dutta, Joydeep
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Funktionella material, FNM.
    Selective separation of rare earth ions from aqueous solution using functionalized magnetite nanoparticles: kinetic and thermodynamic studies2017Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 327, s. 286-296Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Separation of rare earth ions (RE3+) from aqueous solution is a tricky problem due to their physico-chemical similarities of properties. In this study, we investigate the influence of the functionalized ligands on the adsorption efficiency and selective adsorption of La3+, Nd3+, Gd3+ and Y3+ from aqueous solution using Magnetite (Fe3O4) nanoparticles (NPs) functionalized with citric acid (CA@Fe3O4 NPs) or L-cysteine (Cys@Fe3O4 NPs). The microstructure, thermal behavior and surface functionalization of the synthesized nanoparticles were studied. The general adsorption capacity of Cys@Fe3O4 NPs was found to be high (98 mg g−1) in comparison to CA@Fe3O4 NPs (52 mg g−1) at neutral pH 7.0. The adsorption kinetic studies revealed that the adsorption of RE3+ ions follows a pseudo second-order model and the adsorption equilibrium data fits well to the Langmuir isotherm. Thermodynamic studies imply that the adsorption process was endothermic and spontaneous in nature. Controlled desorption within 30 min of the adsorbed RE3+ ions from both Cys@Fe3O4 NPs and CA@Fe3O4 NPs was achieved with 0.5 M HNO3. Furthermore, Cys@Fe3O4 NPs exhibited a higher separation factor (SF) in the separation of Gd3+/La3+, Gd3+/Nd3+, Gd3+/Y3+ ions compared to CA@Fe3O4 NPs.

  • 5.
    Avila, Marta
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Funktionella material, FNM.
    Burks, Terrance
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Funktionella material, FNM.
    Akhtar, F.
    Department of Materials and Environmental Chemistry, Stockholm Universtiy, Stockholm, Sweden.
    Göthelid, Mats
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Materialfysik, MF.
    Lansåker, P. C.
    Department of Engineering Sciences, The Ångström Laboratory, Uppsala University, Uppsala, Sweden.
    Toprak, Muhammet S.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Funktionella material, FNM.
    Muhammed, Mamoun
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Funktionella material, FNM.
    Uheida, Abdusalam
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Funktionella material, FNM.
    Surface functionalized nanofibers for the removal of chromium(VI) from aqueous solutions2014Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 245, s. 201-209Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Polyacrylonitrile (PAN) nanofibers functionalized with amine groups (PAN-NH2) were prepared using a simple one-step reaction route. The PAN-NH2 nanofibers were investigated for the removal of chromium(VI) from aqueous solutions. The adsorption and the kinetic characteristics were evaluated in batch process. The adsorption process showed pH dependence and the maximum Cr(VI) adsorption occurred at pH = 2. The Langmuir adsorption model described well the experimental adsorption data and estimated a maximum loading capacity of 156 mg/g, which is a markedly high value compared to other adsorbents reported. The kinetics studies indicated that the equilibrium was attained after 90 min and the experimental data followed a pseudo-second order model suggesting a chemisorption process as the rate limiting step. X-ray Photoelectron Spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR) revealed that the adsorption of Cr(VI) species on PAN-NH2 was facilitated through both electrostatic attraction and surface complexation. High desorption efficiency (> 90%) of Cr(VI) was achieved using diluted base solutions that may allow the reuse of PAN-NH2 nanofibers.

  • 6.
    Chen, Yangyang
    et al.
    Guangxi Univ, Coll Light Ind & Food Engn, Nanning 530004, Peoples R China.;Guangxi Key Lab Clean Pulp & Papermaking & Pollut, Nanning 530004, Peoples R China..
    Hou, Hewei
    Guangxi Univ, Coll Light Ind & Food Engn, Nanning 530004, Peoples R China.;Guangxi Key Lab Clean Pulp & Papermaking & Pollut, Nanning 530004, Peoples R China..
    Liu, Bing
    Guangxi Univ, Coll Light Ind & Food Engn, Nanning 530004, Peoples R China.;Guangxi Key Lab Clean Pulp & Papermaking & Pollut, Nanning 530004, Peoples R China..
    Li, Moyang
    Guangxi Univ, Coll Light Ind & Food Engn, Nanning 530004, Peoples R China.;Guangxi Key Lab Clean Pulp & Papermaking & Pollut, Nanning 530004, Peoples R China..
    Chen, Lan
    Guangxi Univ, Coll Light Ind & Food Engn, Nanning 530004, Peoples R China.;Guangxi Key Lab Clean Pulp & Papermaking & Pollut, Nanning 530004, Peoples R China..
    Chen, Changzhou
    Guangxi Univ, Coll Light Ind & Food Engn, Nanning 530004, Peoples R China.;Guangxi Key Lab Clean Pulp & Papermaking & Pollut, Nanning 530004, Peoples R China..
    Wang, Shuangfei
    Guangxi Univ, Coll Light Ind & Food Engn, Nanning 530004, Peoples R China.;Guangxi Key Lab Clean Pulp & Papermaking & Pollut, Nanning 530004, Peoples R China..
    Li, Yuanyuan
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Centra, Wallenberg Wood Science Center. KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Biokompositer. Guangxi Univ, Coll Light Ind & Food Engn, Nanning 530004, Peoples R China..
    Min, Douyong
    Guangxi Univ, Coll Light Ind & Food Engn, Nanning 530004, Peoples R China.;Guangxi Key Lab Clean Pulp & Papermaking & Pollut, Nanning 530004, Peoples R China..
    Wood-derived scaffolds decorating with nickel cobalt phosphate nanosheets and carbon nanotubes used as monolithic electrodes for assembling high-performance asymmetric supercapacitor2023Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 454, artikkel-id 140453Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Lightweight carbonized wood (CW) loaded with pseudocapacitive materials has demonstrated excellent energy density. However, the direct loading of active materials usually results in poor rate performance and cycling stability. Herein, we fabricated a CW electrode with high loading of active materials and conductivity through chemical vapor deposition (CVD) and electrodeposition to sequentially incorporate carbon nanotubes (CNTs) and nickel-cobalt phosphate (NiCo-P) nanosheets. This integrated NiCo-P/CNT/CW electrode exhibited a promising areal capacitance of 11.2F cm-2 at a current density of 10 mA cm-2, and a notable capacitance retention rate of 86.6 % at 60 mA cm-2. The asymmetric supercapacitor (ASC) device assembled with the prepared electrode as anode and the self-activated carbonized wood (SCW) electrode as cathode delivers outstanding energy density of 5.74 mWh cm-3 (12.1 Wh kg -1) at power density of 18.75 mW cm-3 (39.5 W kg -1) while maintaining a high capacitance retention of 92.4 % after 10,000 charge-discharge cycles. This work provides an advanced approach for constructing supercapacitors with remarkable energy density and rate performance from the natural wood derived electrodes.

  • 7.
    Chen, Yujie
    et al.
    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China..
    Chen, Zhen
    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China..
    Chen, Chi
    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China..
    Rehman, Hafeez Ur
    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China..
    Liu, Hezhou
    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China..
    Li, Hua
    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China..
    Hedenqvist, Mikael S.
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Polymera material.
    A gradient-distributed liquid-metal hydrogel capable of tunable actuation2021Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 421, s. 127762-, artikkel-id 127762Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Although thermoresponsive hydrogels have numerous applications that range from soft robots, biomedical engineering, and actuators to sensors for artificial muscles, the existing hydrogel actuators undergo only unidirectional deformation under a single thermal stimulus and suffer from slow actuation and unstable interfacial adhesion in multiple layers. Herein, hydrogels containing gradient-distributed polydopamine-coated eutectic gallium-indium (PDA-EGaIn) nanodroplets in a poly(N-isopropylacrylamide) (PNIPAM) matrix and thus featuring a gradient distribution of thermal conductivity and an increased barrier towards water loss are shown to be capable of a rapid and tuneable thermoresponse. Notably, whereas hydrogels with a low content of PDAEGaIn undergo rapid one-way bending under a single thermal (45 degrees C) stimulus, those with a high content of PDAEGaIn undergo sequential bidirectional (bending) actuation. The ability of these hydrogels to undergo fast and tuneable actuation under a single thermal stimulus makes them suitable for use in grab-release instruments and soft robots.

  • 8. Cloete, Schalk
    et al.
    Khan, Mohammed Nazeer
    Nazir, Shareq Mohd
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik, Energiprocesser.
    Amini, Shahriar
    Cost-effective clean ammonia production using membrane-assisted autothermal reforming2021Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 404Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Ammonia is a widely produced industrial chemical, primarily for use in the fertilizer industry. Recently, interest has also grown in ammonia as a carbon-free energy carrier because it is easier to store and transport than hydrogen. However, ammonia is primarily produced from natural gas with a considerable carbon footprint if the produced CO2 is not captured and stored. This work therefore presents a new ammonia production method based on membrane-assisted autothermal reforming (MA-ATR) for hydrogen production from natural gas with integrated CO2 capture. The MA-ATR reactor offers great process intensification benefits, leading to considerable efficiency gains as well as a simpler and cheaper plant. In the base case, MA-ATR achieves 10.7% greater efficiency, 14.9% lower NH3 production costs and 16.5%-points greater CO2 avoidance than a conventional ammonia plant where captured CO2 is compressed for transport and storage. This economic advantage of MA-ATR increases with higher natural gas prices, lower electricity prices, lower membrane costs and higher CO2 prices. All elements of the proposed plant are mature technologies aside from the membranes and the oxygen carrier material. Further development and demonstration of these two elements is therefore recommended to realize the promising techno-economic performance reported in this study.

    Fulltekst (pdf)
    fulltext
  • 9. Danwittayakul, S.
    et al.
    Dutta, Joydeep
    Center of Excellence in Nanotechnology, Asian Institute of Technology.
    Two step copper impregnated zinc oxide microball synthesis for the reduction of activation energy of methanol steam reformation2013Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 223, s. 304-308Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Cu/ZnO microball catalysts were prepared by a two-step process, where ZnO nanorods supports were first grown hydrothermally followed by the impregnation of copper nanoparticles. Catalytic activities for methanol steam reforming by using Cu/ZnO microball were found to increase with higher copper content. Addition of urea during the metal impregnation process was found to enhance the methanol steam reforming catalytic activity attributed to the larger surface area of the catalyst. Activation energies of synthesized catalyst and CuZnAl commercial catalyst were calculated from the Arrhenius plots of the rate of reaction and were found to affect hydrogen yield. The lowest activation energy of 4.74 kJ mol(-1) was achieved for the optimized catalyst which was half of the activation energy of commercial catalysts.

  • 10.
    Feng, Zhaoxuan
    et al.
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi.
    Odelius, Karin
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi.
    Rajarao, Gunaratna Kuttuva
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Industriell bioteknologi.
    Hakkarainen, Minna
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Polymerteknologi.
    Microwave carbonized cellulose for trace pharmaceutical adsorption2018Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 346, s. 557-566Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A promising sustainable strategy to valorize cellulose to high-value adsorbents for trace pharmaceuticals, like diclofenac sodium (DCF), in the water is demonstrated. Carbon nanospheres (CN) as the DCF adsorbent were derived from cellulose through a one-pot microwave-assisted hydrothermal carbonization method. CN exhibited efficient DCF removal (100% removal of 0.001 mg/mL DCF in 30 s and 59% removal of 0.01 mg/mL DCF in 1 h). The adsorption kinetics and isotherm data were well-fitted with the pseudo-second-order kinetic model and Langmuir model, respectively. The adsorption process was endothermic and spontaneous as confirmed by the thermodynamic parameters. Multiple characterization techniques including SEM/EDS, FTIR, FTIR-imaging and zeta potential were applied to qualitatively investigate the adsorption process. π-π stacking and hydrogen bonding were proposed as the dominant adsorption interactions. CN also demonstrated effective adsorption capacity towards three other commonly-detected contaminants in the wastewater including ketoprofen (KP), benzophenone (BZP), and diphenylamine (DPA), each bearing partial structural similarity with DCF. The affinity of the contaminants towards CN followed the order DPA > BZP > DCF > KP, which could be explained by the different configurations and chemical units. It was speculated that for DCF and KP, the steric hindrance and electrostatic repulsion produced by dissociated carboxyl groups can impede the adsorption process as compared to DPA and BZP. This methodology could offer further insights into the drug adsorption on the cellulose-derived carbon adsorbents and the use of bioderived carbons for treatment of wastewaters contaminated with pharmaceuticals.

  • 11.
    Feng, Zhaoxuan
    et al.
    State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China.
    Xu, Yanan
    State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China.
    Ding, Wenli
    State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China.
    Li, Qingqing
    State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China.
    Zhao, Xiaoli
    State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China.
    Wei, Xin-Feng
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi.
    Hakkarainen, Minna
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi.
    Wu, Mingbo
    State Key Laboratory of Heavy Oil Processing, College of New Energy, China University of Petroleum (East China), Qingdao 266580, China.
    Nano graphene oxide creates a fully biobased 3D-printed membrane with high-flux and anti-fouling oil/water separation performance2024Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 485, artikkel-id 149603Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Facile fabrication of green and renewable bio-based membranes with good anti-fouling and oil/water separation performance is of great importance to solve the oil spills and industrial oily wastewater threatening the ecological environment. Here, a fully biobased oil/water separation membrane with an ordered porous structure was 3D printed ultraviolet-assisted direct ink writing. The components of the bio-ink were obtained by methacrylation of chitosan (CS) and gelatin (GEL) to synthesize methacrylated chitosan (CSMA) and methacrylated gelatin (GELMA), while the nanographene oxide (nGO) was derived from CS through a simple microwave-assisted hydrothermal carbonization followed by oxidation step. The addition of nGO boosted the printability of the bio-ink, and the anti-fouling property and water permeation flux of the printed membranes. As a result, the membrane M−CSMA/GELMA/nGO-0.7 with the optimal performance possessed a low water contact angle in air of 0°, and high underwater oil contact angle of 161.5°, demonstrating a combination of superhydrophilic and underwater superoleophobic properties. M−CSMA/GELMA/nGO-0.7 has good corrosion resistance and long service life as evidenced from the separation efficiency of n-heptane/water, which kept above 99.5 % and a high water permeation flux above 38,300 L m−2h−1 after 20 cyclic tests in the harsh aquatic conditions containing 1 M NaCl, 1 M HCl, or 1 M NaOH, respectively. This shows promising potential for real-life applications.

  • 12.
    Fijoł, Natalia
    et al.
    Department of Materials and Environmental Chemistry, Stockholm University, Frescativägen 8, 106 91, Stockholm, Sweden; Wallenberg Wood Science Center, Teknikringen 56-58, 100 44, Stockholm, Sweden.
    Aguilar-Sánchez, Andrea
    Department of Materials and Environmental Chemistry, Stockholm University, Frescativägen 8, 106 91, Stockholm, Sweden.
    Ruiz-Caldas, Maria Ximena
    Department of Materials and Environmental Chemistry, Stockholm University, Frescativägen 8, 106 91, Stockholm, Sweden.
    Redlinger-Pohn, Jakob D.
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Fiberprocesser.
    Mautner, Andreas
    Polymer and Composite Engineering (PaCE) Group, Institute of Materials Chemistry and Research, Faculty of Chemistry, University of Vienna, Währinger Str. 42, 1090 Wien, Austria.
    Mathew, Aji P.
    Department of Materials and Environmental Chemistry, Stockholm University, Frescativägen 8, 106 91, Stockholm, Sweden; Wallenberg Wood Science Center, Teknikringen 56-58, 100 44, Stockholm, Sweden.
    3D printed polylactic acid (PLA) filters reinforced with polysaccharide nanofibers for metal ions capture and microplastics separation from water2023Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 457, artikkel-id 141153Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The need for multifunctional, robust, reusable, and high-flux filters is a constant challenge for sustainable water treatment. In this work, fully biobased and biodegradable water purification filters were developed and processed by the means of three-dimensional (3D) printing, more specifically by fused deposition modelling (FDM). The polylactic acid (PLA) – based composites reinforced with homogenously dispersed TEMPO-oxidized cellulose nanofibers (TCNF) or chitin nanofibers (ChNF) were prepared within a four-step process; i. melt blending, ii. thermally induced phase separation (TIPS) pelletization method, iii. freeze drying and iv. single-screw extrusion to 3D printing filaments. The monolithic, biocomposite filters were 3D printed in cylindrical as well as hourglass geometries with varying, multiscale pore architectures. The filters were designed to control the contact time between filter's active surfaces and contaminants, tailoring their permeance. All printed filters exhibited high print quality and high water throughput as well as enhanced mechanical properties, compared to pristine PLA filters. The improved toughness values of the biocomposite filters clearly indicate the reinforcing effect of the homogenously dispersed nanofibers (NFs). The homogenous dispersion is attributed to the TIPS method. The NFs effect is also reflected in the adsorption capacity of the filters towards copper ions, which was shown to be as high as 234 and 208 mg/gNF for TCNF and ChNF reinforced filters, respectively, compared to just 4 mg/g for the pure PLA filters. Moreover, the biocomposite-based filters showed higher potential for removal of microplastics from laundry effluent water when compared to pure PLA filters with maximum separation efficiency of 54 % and 35 % for TCNF/PLA and ChNF/PLA filters, respectively compared to 26 % for pure PLA filters, all that while maintaining their high permeance. The combination of environmentally friendly materials with a cost and time-effective technology such as FDM allows the development of customized water filtration systems, which can be easily adapted in the areas most affected by the inaccessibility of clean water.

  • 13.
    Ghorbani, Morteza
    et al.
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Medicinteknik och hälsosystem, Medicinsk avbildning. Mechatronics Engineering Program, Faculty of Engineering and Natural Science, Sabanci University, 34956 Tuzla, Istanbul, Turkey.
    Araz, Sheybani Aghdam
    Faculty of Engineering and Natural Sciences, Sabanci University, Tuzla, Istanbul 34956, Turkey.
    Talebian, Moein
    Mechatronics Engineering Program, Faculty of Engineering and Natural Science, Sabanci University, 34956 Tuzla, Istanbul, Turkey.
    Kosar, Ali
    Mechatronics Engineering Program, Faculty of Engineering and Natural Science, Sabanci University, 34956 Tuzla, Istanbul, Turkey ; Sabanci University Nanotechnology Research and Application Center, 34956 Tuzla, Istanbul, Turkey ; Center of Excellence for Functional Surfaces and Interfaces for Nano-Diagnostics (EFSUN), Sabanci University, Orhanli, 34956 Tuzla, Istanbul, Turkey.
    Cakmak Cebeci, Fevzi
    Faculty of Engineering and Natural Sciences, Sabanci University, Tuzla, Istanbul 34956, Turkey ; Sabanci University Nanotechnology Research and Application Center, 34956 Tuzla, Istanbul, Turkey.
    Grishenkov, Dmitry
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Medicinteknik och hälsosystem, Medicinsk avbildning.
    Svagan, Anna Justina
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi.
    Facile Hydrodynamic Cavitation ON CHIP via Cellulose Nanofibers Stabilized Perfluorodroplets inside Layer-by-Layer Assembled SLIPS Surfaces2019Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The tremendous potential of “hydrodynamic cavitation on microchips” has been highlighted during recent years in various applications. Cavitating flow patterns, substantially depending upon thermophysical and geometrical characteristics, promote diverse industrial and engineering applications, including food and biomedical treatment. Highly vaporous and fully developed patterns in microfluidic devices are of particular interest. In this study, the potential of a new approach, which includes cellulose nanofiber (CNF)- stabilized perfluorodroplets (PFC5s), was assessed inside microfluidic devices. The surfaces of these devices were modified by assembling various sizes of silica nanoparticles, which facilitated in the generation of cavitation bubbles. To examine the pressure effects on the stabilized droplets in the microfluidic devices, the upstream pressure was varied, and the cavitation phenomenon was characterized under different experimental conditions. The results illustrate generation of interesting, fully developed, cavitating flows at low pressures for the stabilized droplets, which has not been previously observed in the literature. Supercavitation flow pattern, filling the entire microchannel, were recorded at the upstream pressure of 1.7 MPa for the case of CNF-stabilized PFC5s, which hardly corresponds to cavitation inception for pure water in the same microfluidic device.

    Fulltekst (pdf)
    fulltext
  • 14.
    Halakarni, Mahaveer A.
    et al.
    Jain Univ, Ctr Nano & Mat Sci, Jain Global Campus, Bangalore 562112, India..
    Polisetti, Veerababu
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Polymera material. KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Centra, Wallenberg Wood Science Center.
    Samage, Anita A.
    Jain Univ, Ctr Nano & Mat Sci, Jain Global Campus, Bangalore 562112, India..
    Mahto, Ashesh
    Jain Univ, Ctr Nano & Mat Sci, Jain Global Campus, Bangalore 562112, India..
    Svagan, Anna Justina
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi. KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Centra, Wallenberg Wood Science Center.
    Hedenqvist, Mikael S.
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Polymera material. KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Centra, Wallenberg Wood Science Center.
    Nataraj, Sanna Kotrappanavar
    Jain Univ, Ctr Nano & Mat Sci, Jain Global Campus, Bangalore 562112, India..
    Design of selective and self-cleaning iron aminoclay thin film nanocomposite membranes2023Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 456, artikkel-id 140941Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Selective separation using efficient high-performance nanofiltration membranes has the potential for widespread application in multiple fields, including dye desalination, industrial wastewater treatment, and resource recovery from different feed streams. This study focused on the design of selective and self-cleaning nanofiltration membranes by incorporating iron aminoclay nanoparticles in a piperazine-based polyamide active layer supported on an ultrafiltration PAN substrate. Fe-AC nanoparticles and thin film nanocomposites (TFNC) were characterized for their morphology, surface chemistry, roughness, and surface area. In terms of wettability/hydrophilicity, TFNC membranes with Fe-AC incorporated had the lowest contact angle of 33.5 degrees, while that of the pristine TFNC0 membrane was 60.5 degrees. They also had a higher surface negative zeta potential and smoother surface morphology. The TFNC membranes also exhibited higher water fluxes and enhanced selectivity towards molecular separation compared to the control membranes. The water flux of the optimized AC polyamide membrane, TFNC3, was 19.70 +/- 0.5 LMH (L. m- 2.h-1), while that of the pristine TFNC0 membrane was 4.85 +/- 0.6 LMH at 4 bar. 98.0-99.0 % rejection of model organic moieties was achieved at a constant flux (Congo red, Eriochrome Black T, methylene blue, Rhodamine 6G, and Crystal violet). When simulated wastewater was purified, the Fe-AC TFNC showed 98.0 % rejection of dyes and 20.0 % rejection of inorganic salts. In long-term filtration studies (>210 h) using simulated wastewater spiked with multiple foulants, >98.0 % rejection of organic matter and foulants was recorded with a stable long-term flux profile. A leaching study confirmed that the membranes were structurally stable, even after the self-cleaning process and at elevated temperatures, without any significant reduction in flux or rejection. Comparing the fouling performance between TFNC3 membranes and commercial reverse osmosis (RO) membranes, the FDR and Flux Recovery Ratio (FRR) values of commercial RO membranes were 58.0 % and 73.0 %, while those of TFNC3 were 47.0 % and 97.0 %, respectively. The results show that the membranes have lower fouling values and higher FRR values when iron clay is present. These results demonstrate the potential of the membranes for effective pre-treatment of various industrial wastewaters and selective separation.

  • 15.
    Hamisi, Rajabu
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Hållbar utveckling, miljövetenskap och teknik, Vatten- och miljöteknik.
    Renman, Agnieszka
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Hållbar utveckling, miljövetenskap och teknik, Vatten- och miljöteknik.
    Renman, Gunno
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Hållbar utveckling, miljövetenskap och teknik, Vatten- och miljöteknik.
    Wörman, Anders
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Hållbar utveckling, miljövetenskap och teknik, Resurser, energi och infrastruktur.
    Thunvik, Roger
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Hållbar utveckling, miljövetenskap och teknik, Vatten- och miljöteknik.
    Optimization of on-site wastewater treatment efficiency and recovery based on nutrient mobility and adsorption kinetics modelling using HYDRUS-2D coupled with PHREEQC2024Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 492, artikkel-id 152308Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A closed-loop on-site wastewater treatment system (OWT) was studied comprising steps of septic tank to remove organics (Biological Oxygen Demand (BOD)), biofiltration clarifier for biological removal of nitrogen (N), phosphorus (P) and BOD, reactive Polonite® filter for chemical adsorption and precipitation removal of dissolved P, and tidal flow constructed wetland (TFCW) sand filter for polishing the effluent to low P and N effluent Swedish standards. The field experimental data that have been used to optimize TFCW design in the numerical modelling using HYDRUS-2D coupled with and without PHREEQC indicated that the adsorption efficiency of the reactive Polonite® adsorbent was nearly double to that obtained in TFCW sand filters for PO4-P (95 %) and Total-P (85 %) removal in summer at a high temperature range (15.4–18.8 °C) and pH range (9.9–10.8). The weaker PO4-P (53 %) and Total-P (25 %) removal efficiency in winter was due to a low temperature (1.5–8.1 °C) and low pH (7.2–7.9). This decrease in pH was attributed to salinity in the domestic wastewater and dilution of rainwater. Modelling results revealed that the transport mechanisms and rate of P adsorption kinetics in the TFCW sand filters enhanced with calcium and iron flow from chemical dissolution in the preceding Polonite® adsorbent was increased with the increase in temperature. However, the P adsorption was less sensitive at high ferrihydrite (Fe(OH)3) dose, suggesting limited effects of cations dissolution and abundance of metal oxides and hydroxide ions at the mineral surface for anions exchange with phosphate for surface complexation. The strategy of combining field data and modelling provided valuable insights for assessing adaptability and optimizing TFCW design under variable fluxes and scenario effects of insulated/uninsulated and dilution by rainwater in cold-climate regions.

  • 16.
    Han, Tong
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Ding, Saiman
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik.
    Yang, Weihong
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Jönsson, Pär
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Catalytic pyrolysis of lignin using low-cost materials with different acidities and textural properties as catalysts2019Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 373, s. 846-856Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Catalytic fast pyrolysis of lignin was performed using low-cost materials with different acidities and textural properties as catalysts in the present work. The main focus is to understand the role of low-cost catalysts in the fast pyrolysis of lignin. The four most commonly used low-cost catalysts, ilmenite (FeTiO3), bentonite (Al-Si-OH), activated carbon (AC) and red mud (RM), were selected. The results show that bentonite, red mud and activated carbon effectively enhance the dehydration reaction, which is regarded as the dominant way to eliminate oxygen during the pyrolysis process, due to the existence of strong acidic sites. However, only activated carbon is found to be effective in promoting the production of monocyclic aromatic hydrocarbons (MAHs). Two metallic catalysts, i. e., bentonite and red mud, have strong acidities but quite low surface areas and less porous structures. Therefore, the dehydrated intermediates produced are especially easy to repolymerize to form char or coke without the restriction of obtaining a porous structure during the pyrolysis process. Activated carbon has not only a certain acidity but also a rich porous structure. Lignin fast pyrolysis-derived oxygenates can diffuse and react on the well-dispersed active sites within the pores of activated carbons. The catalytic performance of the activated carbon are supposed to be determined by the pore size. Only pores of similar size to lignin fast pyrolysis-derived oxygenates (0.6-1 nm) seems to be effective for the production of MAHs. Pores larger or smaller than lignin fast pyrolysis-derived oxygenates both tend to cause coke deposition rather than MAHs formation.

  • 17.
    Han, Tong
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Yang, Weihong
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Jönsson, Pär
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Pyrolysis and subsequent steam gasification of metal dry impregnated lignin for the production of H2-rich syngas and magnetic activated carbon2020Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 394, artikkel-id 124902Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    An integrated process that includes the pyrolysis of FeSO4 dry impregnated lignin and subsequent steam gasification of the produced biochar has been performed to produce H2-rich syngas and magnetic activated carbon. The results show that gasification is more beneficial for hydrogen production than pyrolysis. Increasing the pyrolysis temperature from 550 °C to 800 °C and iron loading from 4% to 8% not only promotes the extension decomposition of lignin but also induces the production of char, which is more effective for gasification. As a result, the syngas yield and H2 volumetric percentage of both the pyrolysis and steam gasification processes are enhanced. The maximum overall H2 yield and exergy efficiency for producing H2 are estimated to be 42.73 mol/kg-lignin and 46.63%, respectively. Magnetic activated carbon materials produced from the proposed integrated process have a good porous property and high saturation magnetization value. Magnetic activated carbon that is produced from the same process that achieves a maximum H2 yield is obtained and exhibits an approximate 70% total phosphate and 20% ammonia and nitrogen removal efficiency for treating real domestic wastewater.

  • 18.
    Jagodzińska, Katarzyna
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Jönsson, Pär Göran
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Processer.
    Yang, Weihong
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Processer.
    Pyrolysis and in-line catalytic decomposition of excavated landfill waste to produce carbon nanotubes and hydrogen over Fe- and Ni-based catalysts - Investigation of the catalyst type and process temperature2022Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 446, artikkel-id 136808Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Undeniably, non-sanitary landfills existing worldwide pose considerable environmental risks related to air, water and soil pollution. Despite that, the landfill mining concept does not spread swiftly around the world. To prevent its fading into oblivion, it is necessary to transform the perception of landfills as waste to seeing them as stocks of valuable materials. Guided by this idea, this novel study investigates the possibility of producing carbon nanotubes (CNTs) and hydrogen-rich gas, materials crucial for our transition towards a more sustainable future, from excavated waste as these. To the best of our knowledge, this is the first study on catalytic pyrolysis of excavated waste. For this purpose, excavated waste was subjected to pyrolysis followed by in-line catalytic decomposition of the produced pyrovapours. The impact of the catalyst type and catalyst bed temperature on the process performance was analysed. Six types of monometallic and bimetallic Ni- and Fe- based catalysts, synthesised using two methods (the sol-gel and the impregnation method), were considered. Three catalyst bed temperatures were taken into account, namely 700 degrees C, 800 degrees C, and 900 degrees C. The results showed that the bimetallic catalyst prepared by using the sol-gel method (FeNi/Al_Sg) outperformed the other analysed catalysts, yielding 9 mmol/g(sample_daf) of H-2 and 76 mg/g(sample_daf) of CNTs at 800 degrees C. The product yields and quality were comparable to those reported in the open literature for homogeneous plastic waste pyrolysis. Eventually, the future research directions were discussed.

  • 19.
    Karatzas, Xanthias
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk teknologi.
    Nilsson, Marita
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk teknologi.
    Dawody, Jazaer
    Lindström, Bard
    Pettersson, Lars J.
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk teknologi.
    Characterization and optimization of an autothermal diesel and jet fuel reformer for 5 kW(e) mobile fuel cell applications2010Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 156, nr 2, s. 366-379Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The present paper describes the characterization of an autothermal reformer designed to generate hydrogen by autothermal reforming (ATR) from commercial diesel fuel (similar to 10 ppm S) and jet fuel (similar to 200 ppm S) for a 5 kW(e) polymer electrolyte fuel cell (PEFC). Commercial noble metal-based catalysts supported on 900 cpsi cordierite monoliths substrates were used for ATR with reproducible results. Parameters investigated in this study were the variation of the fuel inlet temperature, fuel flow and the H2O/C and O-2/C ratios. Temperature profiles were studied both in the axial and radial directions of the reformer. Product gas composition was analyzed using gas chromatography. It was concluded from the experiments that an elevated fuel inlet temperature (>= 60 degrees C) and a higher degree of fuel dispersion, generated via a single-fluid pressurized-swirl nozzle at high fuel flow, significantly improved the performance of the reformer. Complete fuel conversion, a reforming efficiency of 81% and an H-2 selectivity of 96% were established for ATR of diesel at P=5kW(e), H2O/C = 2.5, O-2/C = 0.49 and a fuel inlet temperature of 60 degrees C. No hot-spot formation and negligible coke formation were observed in the reactor at these operating conditions. The reforming of jet fuel resulted in a reforming efficiency of only 42%. A plausible cause is the coke deposition, originating from the aromatics present in the fuel, and the adsorption of S-compounds on the active sites of the reforming catalyst. Our results indicate possibilities for the developed catalytic reformer to be used in mobile fuel cell applications for energy-efficient hydrogen production from diesel fuel.

  • 20.
    Kivisaari, Timo
    et al.
    KTH, Tidigare Institutioner (före 2005), Kemi.
    Björnbom, Pehr
    KTH, Tidigare Institutioner (före 2005), Kemi.
    Sylwan, Christopher
    KTH, Tidigare Institutioner (före 2005), Kemiteknik.
    Jacquinot, B.
    Jansen, D.
    de Groot, A.
    The feasibility of a coal gasifier combined with a high-temperature fuel cell2004Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 100, nr 03-jan, s. 167-180Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The purpose of the study presented in this paper was to find out the feasibility of integrating a 50MW fuel cell system, fed by gas from a coal gasifier. with an existing network for distribution of heat and power. The work presented is the results of the technical evaluation of a 50MW coal fired high-temperature fuel cell power plant. The overall system can be divided into four subsystems including: coal gasification, gas cleaning, power generation and heat recovery. The final system, a entrained flow gasifier combined with standard low-temperature gas cleanup and SOFC, resulted in an overall electrical efficiency of about 47%, and an overall efficiency close to 85%.

  • 21. Krawczyk, H.
    et al.
    Oinonen, Petri
    KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi, Träkemi och massateknologi.
    Jönsson, A. -S
    Combined membrane filtration and enzymatic treatment for recovery of high molecular mass hemicelluloses from chemithermomechanical pulp process water2013Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 225, s. 292-299Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Hemicelluloses with high molecular mass are needed for the manufacture of value added products such as food packaging barrier films. In this work such molecules were recovered from chemithermomechanical pulp (CTMP) process water using an innovative three-stage process comprising membrane separation and enzymatic treatment with laccase. Microfiltration followed by ultrafiltration was found to be a suitable combination in the first stage, providing a concentrated and purified hemicellulose fraction suitable for enzymatic treatment. In both membrane processes a high average flux (260 and 115 l/m(2) h) and a low fouling tendency were observed. A marked increase in the average molecular mass of hemicelluloses with bound lignin moieties was achieved by laccase treatment in the second stage. The enzymatically crosslinked hemicelluloses were finally recovered in the third stage using ultrafiltration. In the final high molecular mass solution the hemicellulose concentration was 54 g/l, the contribution of hemicelluloses to the total solids content 43%, and the viscosity of the solution 27 mPa s. The results demonstrate that a hemicellulose fraction of high quality can be produced from CTMP process water, and that this could constitute a suitable feedstock for the production of, for example, barrier films for renewable packaging.

  • 22.
    $$$Kumar Kalita, Naba
    et al.
    KTH Royal Institute of Technology, Department of Fibre and Polymer Technology, Teknikringen 58, 100 44 Stockholm, Sweden, Teknikringen 58.
    $$$Hazarika, Doli
    KTH Royal Institute of Technology, Department of Fibre and Polymer Technology, Teknikringen 58, 100 44 Stockholm, Sweden, Teknikringen 58.
    Srivastava, Rajiv K.
    Department of Textile and Fibre Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India, New Delhi.
    $$$Hakkarainen, Minna
    KTH Royal Institute of Technology, Department of Fibre and Polymer Technology, Teknikringen 58, 100 44 Stockholm, Sweden, Teknikringen 58.
    Faster biodegradable and chemically recyclable polycaprolactone with embedded enzymes: Revealing new insights into degradation kinetics2024Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 496, artikkel-id 153982Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Embedding immobilized lipase (IL) enzymes into polycaprolactone (PCL) matrix was demonstrated as a promising route to faster biodegradable and chemically recyclable PCL products. Furthermore, the materials could be thermally processed by extrusion and 3D printed by fused filament fabrication technique. The embedded-enzymes were shown to effectively accelerate the degradation of PCL under simulated industrial composting conditions and in aqueous solution in combination with external enzymes. To reveal deeper insights into the underlying mechanisms, the biodegradation kinetic parameters governing organic carbon (OC) mineralization were calculated. Furthermore, the concept of biodegradation half-life (B1/2) was introduced and correlated with the organic carbon (OC) mineralization rate of enzyme-embedded PCL films and filaments, especially under thermophilic composting conditions. This sheds light on how the incorporation of immobilized enzymes into PCL facilitates the degradation process. Furthermore, the feasibility of enzyme-catalyzed chemical recycling under mild conditions followed by enzyme-catalyzed repolymerization was demonstrated. The applied material design principle holds promise for addressing the pressing challenges associated with plastic waste, when moving forward towards a more sustainable and environmentally conscious future.

  • 23.
    Kumar, Manish
    et al.
    Univ Petr & Energy Studies, Sch Engn, Sustainabil Cluster, Dehra Dun 248007, Uttarakhand, India..
    Jiang, Guangming
    Univ Wollongong, Sch Civil Min & Environm Engn, Wollongong, NSW, Australia.;Univ Wollongong, Illawarra Hlth & Med Res Inst IHMRI, Wollongong, NSW, Australia..
    Thakur, Alok Kumar
    Indian Inst Technol Gandhinagar, Discipline Earth Sci, Gandhinagar 382355, Gujarat, India..
    Chatterjee, Shreya
    Encore Insoltech Pvt Ltd, Gandhinagar 382307, Gujarat, India..
    Bhattacharya, Tanushree
    Birla Inst Technol, Dept Civil & Environm Engn, Mesra 835215, India..
    Mohapatra, Sanjeeb
    Natl Univ Singapore, NUS Environm Res Inst, Singapore, Singapore..
    Chaminda, Tushara
    Univ Ruhuna, Dept Civil & Environm Engn, Matara, Sri Lanka..
    Tyagi, Vinay Kumar
    Indian Inst Technol Roorkee, Dept Civil Engn, Environm BioTechnol Grp EBiTG, Roorkee, Uttarakhand, India..
    Vithanage, Meththika
    Univ Petr & Energy Studies, Sch Engn, Sustainabil Cluster, Dehra Dun 248007, Uttarakhand, India.;Univ Sri Jayewardenepura, Fac Appl Sci, Ecosphere Resilience Res Ctr, Nugegoda 10250, Sri Lanka..
    Bhattacharya, Prosun
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Hållbar utveckling, miljövetenskap och teknik, Vatten- och miljöteknik.
    Nghiem, Long D.
    Univ Technol Sydney, Ctr Technol Water & Wastewater, Ultimo 2007, Australia..
    Sarkar, Dibyendu
    Stevens Inst Technol, Dept Civil Environm & Ocean Engn, Hoboken, NJ 07030 USA..
    Sonne, Christian
    Univ Petr & Energy Studies, Sch Engn, Sustainabil Cluster, Dehra Dun 248007, Uttarakhand, India.;Aarhus Univ, Dept Ecosci, DK-4000 Roskilde, Denmark..
    Mahlknecht, Jurgen
    Tecnol Monterrey, Escuela Ingn & Ciencias, Campus Monterey, Monterrey 64849, Nuevo Leon, Mexico..
    Lead time of early warning by wastewater surveillance for COVID-19: Geographical variations and impacting factors2022Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 441, artikkel-id 135936Artikkel, forskningsoversikt (Fagfellevurdert)
    Abstract [en]

    The global data on the temporal tracking of the COVID-19 through wastewater surveillance needs to be comparatively evaluated to generate a proper and precise understanding of the robustness, advantages, and sensitivity of the wastewater-based epidemiological (WBE) approach. We reviewed the current state of knowledge based on several scientific articles pertaining to temporal variations in COVID-19 cases captured via viral RNA predictions in wastewater. This paper primarily focuses on analyzing the WBE-based temporal variation reported globally to check if the reported early warning lead-time generated through environmental surveillance is pragmatic or latent. We have compiled the geographical variations reported as lead time in various WBE reports to strike a precise correlation between COVID-19 cases and genome copies detected through wastewater surveillance, with respect to the sampling dates, separately for WASH and non-WASH countries. We highlighted sampling methods, climatic and weather conditions that significantly affected the concentration of viral SARS-CoV-2 RNA detected in wastewater, and thus the lead time reported from the various climatic zones with diverse WASH situations were different. Our major findings are: i) WBE reports around the world are not comparable, especially in terms of gene copies detected, lag-time gained between monitored RNA peak and outbreak/peak of reported case, as well as per capita RNA concentrations; ii) Varying sanitation facility and climatic conditions that impact virus degradation rate are two major interfering features limiting the comparability of WBE results, and iii) WBE is better applicable to WASH countries having well-connected sewerage system.

  • 24.
    Kumar, Manish
    et al.
    Indian Inst Technol Gandhinagar, Discipline Earth Sci, Gandhinagar 382355, Gujarat, India.;Indian Inst Technol Gandhinagar, Kiran C Patel Ctr Sustainable Dev, Gandhinagar, Gujarat, India..
    Kuroda, Keisuke
    Toyama Prefectural Univ, Dept Environm & Civil Engn, Imizu, Toyama 9390398, Japan..
    Joshi, Madhvi
    Gujarat Biotechnol Res Ctr GBRC, Sect 11, Gandhinagar 382011, Gujarat, India..
    Bhattacharya, Prosun
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Hållbar utveckling, miljövetenskap och teknik, Vatten- och miljöteknik.
    Barcelo, Damia
    Inst Environm Assessment & Water Res IDAEA CSIC, Barcelona, Spain.;Catalan Inst Water Res ICRA CERCA, Girona, Spain..
    First comparison of conventional activated sludge versus root-zone treatment for SARS-CoV-2 RNA removal from wastewaters: Statistical and temporal significance2021Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 425, artikkel-id 130635Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In the initial pandemic phase, effluents from wastewater treatment facilities were reported mostly free from Severe Acute Respiratory Coronavirus 2 (SARS-CoV-2) RNA, and thus conventional wastewater treatments were generally considered effective. However, there is a lack of first-hand data on i) comparative efficacy of various treatment processes for SARS-CoV-2 RNA removal; and ii) temporal variations in the removal efficacy of a given treatment process in the backdrop of active COVID-19 cases. This work provides a comparative account of the removal efficacy of conventional activated sludge (CAS) and root zone treatments (RZT) based on weekly wastewater surveillance data, consisting of forty-four samples, during a two-month period. The average genome concentration was higher in the inlets of CAS-based wastewater treatment plant (WWTP) in the Sargasan ward (1.25 x 10(3) copies/L), than that of RZT-based WWTP (7.07 x 10(2) copies/L) in an academic institution campus of Gandhinagar, Gujarat, India. ORF 1ab and S genes appeared to be more sensitive to treatment i.e., significantly reduced (p < 0.05) than N genes (p > 0.05). CAS treatment exhibited better RNA removal efficacy (p = 0.014) than RZT (p = 0.032). Multivariate analyses suggested that the effective genome concentration should be calculated based on the presence/absence of multiple genes. The present study stresses that treated effluents are not always free from SARS-CoV-2 RNA, and the removal efficacy of a given WWTP is prone to exhibit temporal variability owing to variations in active COVID-19 cases in the vicinity and genetic material accumulation over the time. Disinfection seems less effective than the adsorption and coagulation processes for SARS-CoV-2 removal. Results stress the need for further research on mechanistic insight on SARS-CoV-2 removal through various treatment processes taking solid-liquid partitioning into account.

  • 25.
    Li, Jingwen
    et al.
    Zhejiang Ocean Univ, Sch Food & Pharm, Zhoushan 316022, Peoples R China..
    Zhang, Xiaofang
    Zhejiang Ocean Univ, Sch Food & Pharm, Zhoushan 316022, Peoples R China..
    Zhao, Yadong
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi. Zhejiang Ocean Univ, Sch Food & Pharm, Zhoushan 3.
    Ma, Mingzhu
    Zhejiang Marine Dev Res Inst, Zhoushan 316000, Peoples R China..
    Song, Yan
    Zhejiang Ocean Univ, Sch Food & Pharm, Zhoushan 316022, Peoples R China..
    Zheng, Bin
    Zhejiang Ocean Univ, Sch Food & Pharm, Zhoushan 316022, Peoples R China..
    Zhou, Rusen
    Queensland Univ Technol, Sch Chem & Phys, Brisbane, Qld 4000, Australia.;Queensland Univ Technol, Ctr Mat Sci, Brisbane, Qld 4000, Australia..
    Ostrikov, Kostya (Ken)
    Queensland Univ Technol, Sch Chem & Phys, Brisbane, Qld 4000, Australia.;Queensland Univ Technol, Ctr Mat Sci, Brisbane, Qld 4000, Australia..
    Nisin electroadsorption-enabled multifunctional bacterial cellulose membranes for highly efficient removal of organic and microbial pollutants in water2022Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 440, s. 135922-, artikkel-id 135922Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Membranes fabricated from bacteria-produced cellulose have many practical and technological advantages over other means of cellulose fiber production, however, their functionality for targeted applications is limited and requires complex, multi-stage processing, while the mechanisms underpinned the optimum improvements remain largely unknown. Focusing on one of the highest-demand applications in wastewater treatment, here we resolve the three persistent issues in bacterial cellulose membranes (BCMs), namely poor fibrillar network quality, insufficient functionality and unsatisfactory performance, and discover the counterintuitive, yet most effective mechanism of imparting the multifunctional properties. First, innovative application of the Hestrin-Shramm medium instead of the CM0986 medium stimulated Taonella mepensis to produce BCMs with higher yields, more uniform fibrils and developed fibrillar networks, higher crystallinity indexes, better mechanical and thermal properties. Second, a novel but facile electroadsorption method was developed to enhance BCM functionality via bonding a natural bactericidal peptide-Nisin to the deliberately activated terminals on the BCM surface, achieving great antibacterial activity, good durability, well-preserved nanoporous network, outstanding water retention and low toxicity. Third, due to the synergetic effects of surface adsorption, ionic bonding, physical retention and active microbial killing, the Nisin-decorated BCMs enabled outstanding organic dye removal and excellent disinfection performance, among the best in the available reports. Collectively, this study demonstrates that electroadsorption is a promising and potentially generic strategy to fabricate Nisin-decorated and functionalized BCMs for next-generation membrane filters toward water purification.

  • 26. Lilja, J.
    et al.
    Warna, J.
    Salmi, T.
    Pettersson, Lars J.
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk teknologi.
    Ahlkvist, J.
    Grenman, H.
    Ronnholm, M.
    Murzin, D. Y.
    Esterification of propanoic acid with ethanol, 1-propanol and butanol over a heterogeneous fiber catalyst2005Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 115, nr 02-jan, s. 1-12Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Esterification kinetics of propanoic acid with ethanol, 1-propanol and butanol over a fibrous polymer-supported sulphonic acid catalyst (Smopex-101) was studied. Experiments were carried out in a batch reactor operating isothermally at three different temperatures: 60, 70 and 75 degrees C (80 degrees C for butanol) and with different initial molar ratios of propanoic acid and alcohol (1:1, 1:2 and 2:1). The fiber catalyst was active and stable in all the experiments. The experimental results were modeled according to a Langmuir-Hinshelwood model and with an advanced adsorption-based model. The activity coefficients were calculated according to the UNIFAC model. The activation energy of esterification of propanoic acid with ethanol was found to be 52.6 kJ/mol, 49.9 kJ/mol with 1-propanol and 47.3 kJ/mol with butanol. The kinetic model, which includes the adsorption of carboxylic acid and water combined with the activities of the species, explained the experimentally recorded concentrations well.

  • 27. Lindström, B.
    et al.
    Agrell, J.
    Pettersson, Lars J.
    KTH, Tidigare Institutioner (före 2005), Kemiteknik.
    Combined methanol reforming for hydrogen generation over monolithic catalysts2003Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 93, nr 1, s. 91-101Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    An experimental investigation on hydrogen generation from methanol using monolithic catalysts is presented in this paper. The activity and carbon dioxide selectivity for the reforming of methanol over various binary copper-based materials, Cu/Cr, Cu/Zn and Cu/Zr, have been evaluated. The methanol reforming was performed using steam reforming and combined reforming (CMR, a combination of steam reforming and partial oxidation). The CMR process was carried out at two modes of operation: near auto-thermal and at slightly exothermal conditions. The catalysts have been characterized using BET surface area measurement, X-ray diffraction (XRD), temperature programmed reduction (TPR) and scanning electron microscopy (SEM-EDS). The results show that the choice of catalytic material has a great influence on the methanol conversion and carbon dioxide selectivity of the reforming reaction. The zinc-containing catalyst showed the highest activity for the steam reforming process, whereas the copper/chromium catalyst had the highest activity for the CMR process. The copper/zirconium catalyst had the highest CO2 selectivity for all the investigated process alternatives.

  • 28.
    Lo Re, Giada
    et al.
    Chalmers Univ Technol, Ind & Mat Sci IMS, SE-41296 Gothenburg, Sweden.;Chalmers Univ Technol, FibRe Ctr Lignocellulose Based Thermoplast, Dept Phys, SE-41296 Gothenburg, Sweden..
    Engel, Emile R.
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Fiberteknologi.
    Bjorn, Linnea
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden.;Chalmers Univ Technol, FibRe Ctr Lignocellulose Based Thermoplast, Dept Phys, SE-41296 Gothenburg, Sweden..
    Sicairos, Manuel Guizar
    Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland..
    Liebi, Marianne
    Chalmers Univ Technol, FibRe Ctr Lignocellulose Based Thermoplast, Dept Phys, SE-41296 Gothenburg, Sweden.;Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland.;Empa, Ctr Xray Analyt, Swiss Fed Labs Mat Sci & Technol, CH-9014 St Gallen, Switzerland..
    Wahlberg, Jan
    Tetra Pak, SE-22186 Lund, Sweden..
    Jonasson, Katarina
    Chalmers Univ Technol, Ind & Mat Sci IMS, SE-41296 Gothenburg, Sweden.;Tetra Pak, SE-22186 Lund, Sweden..
    Larsson, Per A.
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Fiberteknologi. Chalmers Univ Technol, Ind & Mat Sci IMS, SE-41296 Gothenburg, Sweden..
    Melt processable cellulose fibres engineered for replacing oil-based thermoplastics2023Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 458, s. 141372-, artikkel-id 141372Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    If cellulosic materials are to replace materials derived from non-renewable resources, it is necessary to overcome intrinsic limitations such as fragility, permeability to gases, susceptibility to water vapour and poor three-dimensional shaping. Novel properties or the enhancement of existing properties are required to expand the applications of cellulosic materials and will create new market opportunities. Here we have overcome the well-known restrictions that impede melt-processing of high cellulose content composites. Cellulose fibres, partially derivatised to dialcohol cellulose, have been used to manufacture three-dimensional high-density materials by conventional melt processing techniques, with or without the addition of a thermoplastic polymer. This work demonstrates the use of melt processable chemically modified cellulose fibres in the preparation of a new generation of highly sustainable materials with tuneable properties that can be tailored for specific applications requiring complex three-dimensional parts.

  • 29.
    Montecchio, Francesco
    et al.
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik. KTH, Dept Chem Engn, SE-10044 Stockholm, Sweden..
    Altimira, Mireia
    KTH, Skolan för teknikvetenskap (SCI), Mekanik.
    Andersson, Anna
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik.
    Engvall, Klas
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik, Processteknologi.
    Fluid dynamics modelling of UV reactors in advanced oxidation processes for VOC abatement applications2019Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 369, s. 280-291Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The present work focuses on the treatment of VOC emissions from industrial processes, since they represent a very severe environmental hazard. For removing the VOC, an AOP (Advanced Oxidation Process) stage based on UV light and ozone was considered, analyzing the methods for the unit scale-up. An innovative CFD (Computational Fluid Dynamics) model, combining UV irradiation, reaction kinetics and fluid dynamics, describing the behavior of UV reactors in the laboratory scale, was developed. This model was verified against experimental results, displaying good agreement. Therefore, we concluded the CFD model could adequately describe relevant features regarding the performance of UV reactors. After analyzing the laboratory reactors, two designed and scaled up prototypes, were simulated using the CFD model. While the first prototype has a standard lamps configuration, the second presents an innovative lamps distribution. As for the laboratory cases, the most relevant features in terms of irradiation and reaction were described for the prototypes, comparing their performance. We evaluated both the overall VOC conversion and VOC conversion per UV lamp, analyzing the energy efficiency of each configuration with adequately accuracy. Therefore, we conclude the developed CFD model to be an important tool for reactor scale-up as a result of the good prediction of experimental results and the accurate description of the governing phenomena. By using the developed model, the scale-up process of UV reactors can be quickly improved, by screening various configurations with the simulator before testing them, saving significant time and effort in the development of full-scale reactors.

  • 30.
    Montecchio, Francesco
    et al.
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik.
    Bäbler, Matthäus
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik.
    Engvall, Klas
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik.
    Development of an irradiation and kinetic model for UV processes in volatile organic compounds abatement applications2018Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 348, s. 569-582Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Air pollution from volatile organic compounds (VOCs) is one of the most important environmental hazards. Advanced oxidation processes (AOPs) with UV systems have been showing high potential for the abatement of VOCs. This work is aimed at modeling UV reactors for scaling-up AOPs from lab-scale to full-scale. The proposed model has a novel approach coupling the UV fluence rate to the photo-kinetic mechanism, for a robust understanding of the phenomena involved. The results show that the 185 nm wavelength is deeply absorbed within few centimeters by oxygen, while the 254 nm wavelength is weakly absorbed by the ozone generated in the reactor. Based on the fluence rate calculations, the reactions of ozone generation and depletion were modeled. The ozone net concentration was compared to the experimental results, for model verification. The model accurately predicts the effect of the airflow rate and reactor diameter for the tested cases. The acetaldehyde oxidation reaction was modeled using a simplified kinetic mechanism, using the experimental data of VOC conversion for a further model verification. The suggested reactor models accurately predicted the effect of airflow rate, while exhibiting limitations for the effect of different reactor diameters. Therefore, a computational fluid dynamics (CFD) investigation is needed for an accurate modeling of the VOCs oxidation reaction, implementing the developed analytical expression for reducing the computational workload. By combining the developed model with a CFD simulator, it would be possible to simulate several reactors, also at full-scale, for predicting their performance and identifying optimal configurations.

  • 31.
    Montecchio, Francesco
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk teknologi.
    Persson, Henry
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik.
    Engvall, Klas
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk teknologi.
    Delin, Jack
    Scandinavian Centriair AB, Sweden.
    Lanza, Roberto
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik.
    Development of a stagnation point flow system to screen and test TiO2-based photocatalysts in air purification applications2016Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 306, s. 734-744Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    An innovative system suitable for the abatement of VOCs (Volatile Organic Compounds), using photo catalysis under UV light, was designed and built. The design of the reactor is based on the stagnation point flow geometry and the fluid dynamics of the system was carefully investigated in order to avoid mass transfer limitations. The proportions of the elements in the reactor were adjusted in order to homogenize the UV irradiation on the catalyst surface. The supports used for the coating of the catalysts were aluminum plates in order to accurately reproduce industrial conditions. After each test, the catalytic plate was examined to evaluate the mechanical strength of the bonding between the catalyst powder and the metallic support. The coating proved to be sufficiently stable for tests in the designed set up. The potential scale-up of the features of the system was considered throughout the design and especially the power of the UV lamps was decided in order to be representative of the industrial cases. In order to evaluate the suitability of the system for catalysis investigations, various photocatalysts, both synthesized and commercial, were screened. Analyzing the activity results, using acetyl aldehyde as a model VOC, it was possible to evaluate clear differences between the samples and P90 proved to be the most active sample. All the aspects investigated in this work demonstrate that the design of the reactor is in accordance with the expectations and that the system is suitable for screening and testing of photocatalysts for VOCs removal applications.

  • 32.
    Nilsson, Marita
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk teknologi.
    Karatzas, Xanthias
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk teknologi.
    Lindström, Bård
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk teknologi.
    Pettersson, Lars J.
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk teknologi.
    Assessing the adaptability to varying fuel supply of an autothermal reformer2008Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 142, s. 309-317Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The present paper describes the study of an autothermal reformer and its fuel-flexible capabilities. Experiments have been performed in a reactor designed to generate hydrogen by autothermal reforming for a 1-5 kW(e) polymer electrolyte fuel cell. Both logistic fuels (diesel, gasoline, and E85) and alternative fuel candidates (methanol, ethanol, and dimethyl ether) were tested in the reformer. The same catalyst composition, Rh supported on Ce/La-doped gamma-Al2O3 and deposited on cordierite monoliths, was used for all fuels. The practical feasibility of reforming each fuel in the present reactor design was tested and evaluated in terms of fuel conversion and selectivity to hydrogen and carbon dioxide. Temperature profiles were studied both in the axial and radial direction of the reformer. It was concluded from the experiments that the reformer design was most suitable for use with hydrocarbon mixtures Such as diesel, gasoline, and E85, where it represents a good basis for an optimized multifuel-reformer design.

  • 33.
    Noor, Imtisal E.
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
    Martin, Andrew R.
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
    Dahl, Olli
    Water recovery from flue gas condensate in municipal solid waste fired cogeneration plants using membrane distillation2020Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 399, artikkel-id 125707Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In cogeneration plants with wet scrubbing of exhaust gases, the resulting flue gas condensate passes through various treatment steps prior to its discharge to recipient water body or for use as boiler feed water. The present investigation examines membrane distillation (MD) as an alternative treatment method, potentially overcoming bio-fouling and other known drawbacks of established membrane technologies while making efficient use of available heat sources and sinks. Laboratory and pilot scale experiments are performed using air gap MD system where acid neutralization has been considered as a pretreatment step in order to avoid ammonia slip. Separation efficiency, transmembrane flux, specific heat demand and net heat demand were determined at different operating conditions. Resultant separation efficiency of the contaminants shows the successful application of MD for flue gas condensate treatment, achieving results that are comparable or even better than separation with reverse osmosis (RO). The obtained transmembrane flux varied between 1.6 and 7.2 L/m2h per module depending upon the hot and cold side temperatures. For various operating conditions, specific heat demand ranged from 400 to 1000 kWh/m3 per module and corresponding net heat demand was around 17.5–110 kWh/m3. The reconcentration study found that 92% of water could be recovered from the tested flue gas condensate. Process economy shows that estimated clean condensate production cost can be as low as 1.7 $/m3.

  • 34.
    Rovira, Marc
    et al.
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik, Processteknologi.
    Engvall, Klas
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik, Processteknologi.
    Duwig, Christophe
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik, Processteknologi.
    Identifying key features in reactive flows: A tutorial on combining dimensionality reduction, unsupervised clustering, and feature correlation2022Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 438, artikkel-id 135250Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This study examines the capabilities of a data-driven workflow for automated key feature identification in reactive flows. The proposed approach aims at expediting the analysis of chemical engineering datasets by generating an automatic and explainable classification of regions showcasing distinct physics. The three main steps of this process, i.e., dimensionality reduction, unsupervised clustering, and feature correlation are discussed. A previously published framework based on these steps is used to compare against our proposed workflow, which employs different and more modern algorithms. The theoretical and practical differences between the previous and current algorithms are demonstrated in full. Overall, the key feature identification capability of the updated workflow is shown to be faster, more accurate, more robust, and closer to human intuition than previous methods. Throughout this study no substantial knowledge of machine learning is required from the reader. This makes this work also double up as a tutorial for researchers aiming at applying these algorithms.

    Fulltekst (pdf)
    fulltext
  • 35.
    Rusli, Andri
    et al.
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi.
    Hedenqvist, Mikael S.
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Polymera material.
    Yin, Haiyan
    RISE Res Inst Sweden, Div Bioecon & Hlth Mat & Surface Design, Box 5607, SE-11486 Stockholm, Sweden..
    Feng, Zhaoxuan
    China Univ Petr East China, Coll Chem Engn, State Key Lab Heavy Oil Proc, Qingdao 266580, Peoples R China..
    Liu, Baicang
    Sichuan Univ, Coll Architecture & Environm, State Key Lab Hydraul & Mt River Engn, Chengdu 610065, Sichuan, Peoples R China..
    Wei, Xin-Feng
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Polymera material.
    Eco-Friendly fabrication of nanoplastic particles and fibrils using polymer blends as templates2024Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 495, artikkel-id 153615Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Plastic pollution poses a critical global environmental challenge, and within this context, nanoplastics (NPs), the smallest plastic fragments, remain poorly understood. The progress in studying NP toxicity and developing analytical methods highly depends on access to well-defined NP materials. Herein, a straightforward and ecofriendly method for fabricating NP particles and fibrils using polymer blends as templates is presented. The process began with blending plastics with a water-soluble polymer (polyvinyl alcohol (PVA)), followed by the dissolution of the PVA matrix in water and the isolation of the NPs through a two-stage filtration process. NP materials from three widely used plastics, polyethylene, polypropylene, and polystyrene, were prepared, underscoring the versatility of this method. The resulting NPs were primarily submicron in size, and their size distribution was tuned by varying the blend ratio. Furthermore, by incorporating a stretch operation during the extrusion, the NP shape could be varied, enabling the fabrication of NP fibril materials. This method, which does not rely heavily on specialized equipment and avoids the use of harsh solvents, offers a viable and eco-friendly approach to fabricating NP samples suitable for a broad range of research applications.

  • 36.
    Salmeron-Sanchez, Ivan
    et al.
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik, Tillämpad elektrokemi. Universidad Autónoma de Madrid (UAM), Departamento de Química Física Aplicada, C/Francisco Tomás y Valiente 7, 28049 Madrid, Spain, C/Francisco Tomás y Valiente 7.
    Mansouri Bakvand, Pegah
    Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden, P.O. Box 124.
    Shirole, Anuja
    Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden, P.O. Box 124.
    Ramón Avilés-Moreno, Juan
    Universidad Autónoma de Madrid (UAM), Departamento de Química Física Aplicada, C/Francisco Tomás y Valiente 7, 28049 Madrid, Spain, C/Francisco Tomás y Valiente 7.
    Ocón, Pilar
    Universidad Autónoma de Madrid (UAM), Departamento de Química Física Aplicada, C/Francisco Tomás y Valiente 7, 28049 Madrid, Spain, C/Francisco Tomás y Valiente 7.
    Jannasch, Patric
    Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden, P.O. Box 124.
    Wreland Lindström, Rakel
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik, Tillämpad elektrokemi.
    Khataee, Amirreza
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik, Tillämpad elektrokemi.
    Zwitterionic poly(terphenylene piperidinium) membranes for vanadium redox flow batteries2023Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 474, artikkel-id 145879Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Over recent years, non-fluorinated ion exchange membranes based on poly(terphenylene) backbones carrying different functional groups have shown potential application for vanadium redox flow batteries (VRFBs). Generally, the ion exchange membrane in VRFBs is a critical component in terms of the output power, long-term stability and cost. Yet, the shortcomings of commercial membranes (e.g., Nafion) have become a substantial barrier to further commercializing VRFBs. After successfully fabricating and testing poly(terphenylene)-based membranes carrying piperidinium and sulfonic acid groups, respectively, for VRFBs, we have in the present work combined both these ionic groups in a single zwitterionic membrane. A series of poly(terphenylene)-based membranes containing zwitterionic (sulfoalkylated piperidinium) and cationic (piperidinium) groups in different ratios (40–60%) were synthesized and investigated. The VRFB using the zwitterionic membranes showed competitive performance compared to Nafion 212 regarding ionic conductivity, capacity retention, and chemical stability. In addition, it was shown that the VRFB performance was improved by increasing the content of zwitterionic groups within the membrane. A self-discharge time of more than 800 h and 78.7% average capacity retention for 500 VRFB cycles were achieved using a membrane with an optimized ratio (60% zwitterionic and 40% piperidinium groups). Furthermore, the chemical stability was promising, as there was no change in the chemical structure after 500 cycles. Our results represent a critical step for developing novel and competitive ion exchange membranes as an excellent alternative to the Nafion benchmark.

  • 37.
    Sebelius, Sara
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik.
    Le, Tan Thanh
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik.
    Pettersson, Lars J.
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk teknologi.
    Lind, Hanna
    Identification of urea decomposition from an SCR perspective: A combination of experimental work and molecular modeling2013Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 231, s. 220-226Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    For the automotive industry selective catalytic reduction (SCR) is the most effective way to get rid of poisonous nitrogen oxides (NOX) in the exhaust. Urea is used as precursor for the reducing agent ammonia. The stricter legislation on NOX emissions for heavy duty vehicles in Euro 6 makes it even more important to optimize the conversion of urea to ammonia.Competing with ammonia formation is the formation of two byproducts commonly observed in the SCR system, biuret and cyanuric acid. These byproducts are formed before the SCR catalyst in the trucks. In the literature different possibilities on the reaction pathway to biuret and cyanuric acid are described. The aim of this study is to understand which of these pathways that is more likely to occur.In this study, the decomposition and synthesis pathways from urea to biuret and cyanuric acid were identified by a combination of laboratory experiments and Density Functional Theory (DFT) calculations. This is the first DFT study on these reactions performed without the influence of a catalyst. Accordingly, this is a study of the reactions where they do occur, before and not over the catalyst. A new gas phase FTIR method for urea and its byproducts was developed.

  • 38.
    Shin, Sung-Ho
    et al.
    Korea Res Inst Chem Technol, Res Ctr Biobased Chem, Ulsan 44429, South Korea..
    Lee, Woojoo
    Korea Res Inst Chem Technol, Res Ctr Biobased Chem, Ulsan 44429, South Korea..
    Kim, Seon-Mi
    Korea Res Inst Chem Technol, Res Ctr Biobased Chem, Ulsan 44429, South Korea..
    Lee, Minkyung
    Korea Res Inst Chem Technol, Res Ctr Biobased Chem, Ulsan 44429, South Korea..
    Koo, Jun Mo
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi.
    Hwang, Sung Yeon
    Korea Res Inst Chem Technol, Res Ctr Biobased Chem, Ulsan 44429, South Korea.;Univ Sci & Technol, Adv Mat & Chem Engn, Daejeon 34113, South Korea..
    Oh, Dongyeop X.
    Korea Res Inst Chem Technol, Res Ctr Biobased Chem, Ulsan 44429, South Korea.;Univ Sci & Technol, Adv Mat & Chem Engn, Daejeon 34113, South Korea..
    Park, Jeyoung
    Korea Res Inst Chem Technol, Res Ctr Biobased Chem, Ulsan 44429, South Korea.;Univ Sci & Technol, Adv Mat & Chem Engn, Daejeon 34113, South Korea..
    Ion-conductive self-healing hydrogels based on an interpenetrating polymer network for a multimodal sensor2019Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 371, s. 452-460Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Conductive self-healing polymer hydrogel and related soft sensor devices are receiving considerable attention from academia to industry because of their impacts on the lifetime and ergonomic design of soft robotics, prosthesis, and health monitoring systems. However, the development of such a material has thus far been limited considering performances and accessibility. Herein, robustness, self-healing, and conductivity for soft electronic skin are realized by an interpenetrating polymer network (IPN) system based on chemical/ionic cross-inked poly(acrylic acid) containing ferric ions, intercalated with physically cross-linked poly(vinyl alcohol). This IPN hydrogel successfully satisfies all three aforementioned capabilities; elongation at break greater than 1400%; recovery to original mechanical properties greater than 80% after 24 h; and 0.14 Sm-1 of ionic conductivity, which is electrically healable. Such ionic conductivity of hydrogels enables multimodal sensing capabilities, i.e., for strain, pressure, and temperature. Particularly, a uniquely designed dual sensor attached to a finger simultaneously detects mechanical folding and pressure changes independently and can undergo large deformation 1000 times repeated and heating up to 90 degrees C.

  • 39.
    Solberg, Simon B.B.
    et al.
    Norwegian University of Science and Technology, Department of Energy and Process Engineering, Høgskoleringen 1, Trondheim, NO-7491, Norway.
    Gómez-Coma, Lucía
    University of Cantabria, Department of Chemical and Biomolecular Engineering, Av. Los Castros 46, Santander, 39005, Spain.
    Wilhelmsen, Øivind
    Department of Chemistry, Norwegian University of Science and Technology, Høgskoleringen 1, Trondheim, NO-7491, Norway.
    Forsberg, Kerstin
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik, Resursåtervinning.
    Burheim, Odne S.
    Norwegian University of Science and Technology, Department of Energy and Process Engineering, Høgskoleringen 1, Trondheim, NO-7491, Norway.
    Electrodialysis for efficient antisolvent recovery in precipitation of critical metals and lithium-ion battery recycling2024Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 486, artikkel-id 150281Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    It has proven effective to recover metal compounds from aqueous mixtures by use of antisolvents; organic compounds that induce selective precipitation. A challenge with antisolvents is that they are both costly to produce and recover on an industrial scale. In recycling of lithium-ion batteries and recovering critical metals, we find that electrodialysis can be a competitive method for purifying and recycling antisolvents. In this study we investigate the use of electrodialysis to separate salt and water from a ternary solution of water, KCl and ethanol. A coupled non-equilibrium electrochemical model is developed to understand how such systems may be operated, designed, and which characteristics that are required for the ion exchange membranes. We demonstrate how the water transference coefficients of the membranes should be tuned in the process optimisation and why membrane property design is crucial to the success of this concept. Residual mixtures from antisolvent precipitation, with ethanol (EtOH) solvent weight fractions around 0.6-0.7, can be demineralised and the EtOH fraction increased by 0.1-0.2 at an energy requirement of 60-200 kWh mEtOH−3 by use of electrodialysis. In an example application of the concept, aqueous KCl is precipitated by recycled ethanol in a cyclic process, requiring 0.161 kWh molKCl−1. This example case considers complete ethanol rejection by the membranes and abundant water co-transport, characterised by the transference coefficients: tw=15 and ta=0 for water and EtOH respectively. The findings pave the way for new applications with aqueous mixtures of critical metals.

  • 40.
    Svensson, Per H.
    et al.
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemi, Tillämpad fysikalisk kemi. RISE Res Inst Sweden, Chem & Pharmaceut Dev, SE-15136 Södertälje, Sweden..
    Yushmanov, Pavel
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemi, Tillämpad fysikalisk kemi.
    Tot, Aleksandar
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemi, Tillämpad fysikalisk kemi.
    Kloo, Lars
    KTH, Skolan för kemivetenskap (CHE), Centra, Molekylär elektronik, CMD. KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemi, Tillämpad fysikalisk kemi.
    Berg, Erik
    Uppsala Univ, Dept Chem, Angstrom Lab, Box 538, SE-75121 Uppsala, Sweden..
    Edstro, Kristina
    Uppsala Univ, Dept Chem, Angstrom Lab, Box 538, SE-75121 Uppsala, Sweden..
    Robotised screening and characterisation for accelerated discovery of novel Lithium-ion battery electrolytes: Building a platform and proof of principle studies2023Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 455, s. 140955-, artikkel-id 140955Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A fast transition towards the use of clean and green energy sources requires accelerated discovery of new energy storage systems and devices. In this concept automation and robotics can play a key role. Here we present the development of a robotized platform, Poseidon, for the screening and discovery of new water-based electrolyte candidate systems for lithium-ion batteries (LIBs) systems. We have successfully demonstrated the Poseidon screening and characterisation capabilities for electrolytic discovery, which includes a range of steps such as electrolyte formulation, Raman spectroscopic characterization, coin-cell mounting/disassembling and electro-chemical battery evaluation via an accelerated screening cycling procedure. A comparison with analogous manual laboratory experiments shows that relevant accuracy for robotized screening purposes has been estab-lished. Furthermore, the presented accelerated charge/discharge cycling procedure is shown to be adequate for screening purposes of the test system.

  • 41.
    Talabazar, Farzad Rokhsar
    et al.
    Sabanci Univ, Fac Engn & Nat Sci, TR-34956 Istanbul, Turkey.;Sabanci Univ, Nanotechnol Res & Applicat Ctr, TR-34956 Istanbul, Turkey..
    Aghdam, Araz Sheibani
    Sabanci Univ, Fac Engn & Nat Sci, TR-34956 Istanbul, Turkey.;Sabanci Univ, Nanotechnol Res & Applicat Ctr, TR-34956 Istanbul, Turkey..
    Jafarpour, Mohammad
    Sabanci Univ, Fac Engn & Nat Sci, TR-34956 Istanbul, Turkey.;Sabanci Univ, Nanotechnol Res & Applicat Ctr, TR-34956 Istanbul, Turkey..
    Grishenkov, Dmitry
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Medicinteknik och hälsosystem, Medicinsk avbildning.
    Kosar, Ali
    Sabanci Univ, Fac Engn & Nat Sci, TR-34956 Istanbul, Turkey.;Sabanci Univ, Nanotechnol Res & Applicat Ctr, TR-34956 Istanbul, Turkey.;Sabanci Univ, Ctr Excellence Funct Surfaces & Interfaces Nanodia, TR-34956 Istanbul, Turkey..
    Ghorbani, Morteza
    Sabanci Univ, Fac Engn & Nat Sci, TR-34956 Istanbul, Turkey.;Sabanci Univ, Nanotechnol Res & Applicat Ctr, TR-34956 Istanbul, Turkey.;Sabanci Univ, Ctr Excellence Funct Surfaces & Interfaces Nanodia, TR-34956 Istanbul, Turkey..
    Chemical effects in "hydrodynamic cavitation on a chip": The role of cavitating flow patterns2022Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 445, artikkel-id 136734Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Amongst the advanced oxidation processes (AOPs), hydrodynamic cavitation (HC) has emerged as one of the most cost-efficient, simple and ecologically friendly approaches in the recent decade. This type of the cavitation, in contrast to its counterpart (acoustic cavitation), has a huge potential to upscale to the industrial levels. In the recent years, the micro-scale HC (HC on a chip concept) has exhibited favorable efficacy in terms of nucleation type, surface effects and flow pattern dominancy. In this study, the chemical effects of the HC on a chip concept are shown for the first time by considering the effects of the cavitating flow patterns. So, this is the first attempt to understand the effects of the inception and developed cavitating flow patterns on the chemical reactions during the bubble collapse in the micro-scale. In addition, a particular attention is paid to the chemical reaction effects before the cavitation bubble observation in this investigation. Our results indicated that the triiodide releasing amount was interestingly maximum before the inception occurred, especially at the first cycle. The released amount decreased at the inception and increased for the case of the developed twin cavities. We also showed that, comparing to our previous studies, the cavitation arrived at a relatively lower upstream pressure in the open loop cavitation test rig. Therefore, the outcome of this approach reveals the significance of the in-depth investigations of the complex and very transient nature of the cavitation at different flow patterns. Furthermore, this study implied that reactors benefitting HC on a chip concept will be environmentally friendly tools for producing products from the wastes and worthless materials in the near future.

  • 42.
    Talabazar, Farzad Rokhsar
    et al.
    Sabanci Univ, Fac Engn & Nat Sci, TR-34956 Tuzla, Istanbul, Turkiye.;Sabanci Univ, Nanotechnol Res & Applicat Ctr, TR-34956 Tuzla, Istanbul, Turkiye..
    Baresel, Christian
    IVL Swedish Environm Res Inst, Box 210 60, S-10031 Stockholm, Sweden..
    Ghorbani, Reza
    Ankara Univ, Dept Biol, TR-06100 Tandogan, Ankara, Turkiye..
    Tzanakis, Iakovos
    Oxford Brookes Univ, Fac Technol Design & Environm, Oxford OX33 1HX, England.;Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England..
    Kosar, Ali
    Sabanci Univ, Fac Engn & Nat Sci, TR-34956 Tuzla, Istanbul, Turkiye.;Sabanci Univ, Nanotechnol Res & Applicat Ctr, TR-34956 Tuzla, Istanbul, Turkiye.;Sabanci Univ, Ctr Excellence Funct Surfaces & Interfaces Nanodia, Orhanli, TR-34956 Tuzla, Istanbul, Turkiye..
    Grishenkov, Dmitry
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Medicinteknik och hälsosystem, Medicinsk avbildning.
    Ghorbani, Morteza
    Sabanci Univ, Fac Engn & Nat Sci, TR-34956 Tuzla, Istanbul, Turkiye.;Sabanci Univ, Nanotechnol Res & Applicat Ctr, TR-34956 Tuzla, Istanbul, Turkiye.;Oxford Brookes Univ, Fac Technol Design & Environm, Oxford OX33 1HX, England.;Sabanci Univ, Ctr Excellence Funct Surfaces & Interfaces Nanodia, Orhanli, TR-34956 Tuzla, Istanbul, Turkiye..
    Removal of per- and polyfluoroalkyl substances (PFAS) from wastewater using the hydrodynamic cavitation on a chip concept2024Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 495, artikkel-id 153573Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The elimination of micropollutants such as highly fluorinated substances, including per- and polyfluoroalkyl substances (PFAS), in wastewater treatment plants has been receiving growing attention due to the urgent need to minimize their adverse effects on natural water and associated ecosystems. Conventional treatment methods often fall short in effectively removing PFAS. In this study, the Hydrodynamic Cavitation on a Chip concept (HCOC) was utilized to degrade 11 common PFAS variants (PFAS11) for the first time in three different hydrodynamic cavitation reactor set-ups, each enhanced with surface modifications involving roughness elements. Stockholm municipal wastewater treated by a Membrane BioReactor (MBR) process was subjected to fully developed cavitating flow treatment using the three distinct microscale hydrodynamic cavitation (HC) reactors. The obtained results indicate that the chemical-free HCOC technique employed in this study has a significant potential in the degradation of nearly all investigated PFAS11 compounds at a notable rate of 36.1 % while the combination with MBR process can prevent blockage within the fluidic channels, enabling continuous operation with high throughput processing rates. Our proposed methodology demonstrated promising results in eliminating PFAS and could contribute to advancements in the use of microscale HC to treat micropollutants in wastewater. These findings could be a major leap in water treatment technologies addressing the global burden of resource-efficient micropollutant water treatment.

  • 43.
    Tian, Weiqian
    et al.
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Fiberteknologi. School of Chemistry, Beihang University, Beijing, 100191, China.
    Gao, Q.
    VahidMohammadi, Armin
    Dang, J.
    Li, Z.
    Liang, X.
    Hamedi, M. M.
    Zhang, L.
    Liquid-phase exfoliation of layered biochars into multifunctional heteroatom (Fe, N, S) co-doped graphene-like carbon nanosheets2020Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, artikkel-id 127601Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We here report a liquid-phase exfoliation strategy to delaminate multilayered biochars into multi-heteroatom (Fe, N, S) co-doped graphene-like carbon nanosheets, in which the multilayered biochars derived from naturally evolved layer-by-layer precursors. This strategy provides the versatile capability to tailor the textural properties of the as-synthesized carbon nanosheets, such as obtaining a controllable specific surface area of up to 2491 m2 g−1. Thanks to the unique integration of graphene-like microstructures with a thickness of 4.3 nm, large specific surface area and hierarchical pores, homogenous co-doping of N, S, and Fe, and high electronic conductivity, the as-synthesized Fe-N-S co-doped carbon nanosheets could act as multifunctional electrodes for electrocatalytic process of oxygen reduction reaction (ORR) and capacitive energy storage. The optimized nanosheets showed a better ORR catalytic performance than commercial Pt/C catalyst, with a more positive onset potential (1.026 V) and half-wave potential (0.829 V), higher long-term stability, and outstanding methanol tolerance in alkaline mediums. Furthermore, the porous carbon nanosheets exhibited excellent supercapacitive performances which delivered a high energy density of 29.1 Wh kg−1 at a high power density of up to 39.5 kW kg−1 in an ionic liquid electrolyte. This liquid-phase exfoliation strategy will offer new inspiration for the synthesis of various biomass-derived graphene-like carbon nanosheets for multifunctional applications.

  • 44.
    Tu, Suo
    et al.
    Tech Univ Munich, Lehrstuhl Funkt Mat, Phys Dept, James Franck Str 1, D-85748 Garching, Germany..
    Tian, Ting
    Tech Univ Munich, Lehrstuhl Funkt Mat, Phys Dept, James Franck Str 1, D-85748 Garching, Germany..
    Oechsle, Anna Lena
    Tech Univ Munich, Lehrstuhl Funkt Mat, Phys Dept, James Franck Str 1, D-85748 Garching, Germany..
    Yin, Shanshan
    Tech Univ Munich, Lehrstuhl Funkt Mat, Phys Dept, James Franck Str 1, D-85748 Garching, Germany..
    Jiang, Xinyu
    Tech Univ Munich, Lehrstuhl Funkt Mat, Phys Dept, James Franck Str 1, D-85748 Garching, Germany..
    Cao, Wei
    Tech Univ Munich, Lehrstuhl Funkt Mat, Phys Dept, James Franck Str 1, D-85748 Garching, Germany..
    Li, Nian
    Tech Univ Munich, Lehrstuhl Funkt Mat, Phys Dept, James Franck Str 1, D-85748 Garching, Germany..
    Scheel, Manuel A.
    Tech Univ Munich, Lehrstuhl Funkt Mat, Phys Dept, James Franck Str 1, D-85748 Garching, Germany..
    Reb, Lennart K.
    Tech Univ Munich, Lehrstuhl Funkt Mat, Phys Dept, James Franck Str 1, D-85748 Garching, Germany..
    Hou, Shujin
    Tech Univ Munich, Phys Energy Convers & Storage, Physik Dept, James Franck Str 1, D-85748 Garching, Germany..
    Bandarenka, Aliaksandr S.
    Tech Univ Munich, Phys Energy Convers & Storage, Physik Dept, James Franck Str 1, D-85748 Garching, Germany..
    Schwartzkopf, Matthias
    Deutsch Elektronen Synchrotron DESY, Notkestr 85, D-22603 Hamburg, Germany..
    Roth, Stephan V.
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi. Deutsch Elektronen Synchrotron DESY, Notkestr 85, D-22603 Hamburg, Germany..
    Muller-Buschbaum, Peter
    Tech Univ Munich, Lehrstuhl Funkt Mat, Phys Dept, James Franck Str 1, D-85748 Garching, Germany.;Tech Univ Munich, Heinz Maier Leibnitz Zentrum MLZ, Lichtenbergstr 1, D-85748 Garching, Germany..
    Improvement of the thermoelectric properties of PEDOT:PSS films via DMSO addition and DMSO/salt post-treatment resolved from a fundamental view2022Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 429, artikkel-id 132295Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The combination of dimethyl sulfoxide (DMSO)-solvent doping and physical-chemical DMSO/salt de-doping in a sequence has been used to improve the thermoelectric (TE) properties of poly(3,4-ethylenedioxythiophene):poly (4-styrenesulfonate) (PEDOT:PSS) films. A high power factor of ca.105.2 mu W m(-1) K-2 has been achieved for the PEDOT:PSS film after post-treatment with 10 % sodium sulfite (Na2SO3) in the DMSO/salt mixture (v/v), outperforming sodium bicarbonate (NaHCO3). The initial DMSO-doping treatment induces a distinct phase separation by facilitating the aggregation of the PEDOT molecules. At the same time, the subsequent DMSO/salt dedoping post-treatment strengthens the selective removal of the surplus non-conductive PSS chains. Substantial alterations in the oxidation level, chain conformations, PEDOT crystallites and their preferential orientation are observed upon treatment on the molecular level. At the mesoscale level, the purification and densification of PEDOT-rich domains enable the realization of inter-grain coupling by the formation of the electronically well-percolated network. Thereby, both electrical conductivity and Seebeck coefficient are optimized.

  • 45. Vrabel, P.
    et al.
    van der Lans, Rgjm
    van der Schot, F. N.
    Luyben, Kcam
    Xu, B.
    Enfors, Sven-Olof
    KTH, Tidigare Institutioner (före 2005), Bioteknologi.
    CMA: integration of fluid dynamics and microbial kinetics in modelling of large-scale fermentations2001Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 84, nr 3, s. 463-474Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Transport limitation is regarded as one of the major phenomena leading to process yield reduction in large-scale fermentations. Knowledge of both the fluid dynamics and the microbial kinetics is needed for understanding and describing situations in large-scale production bioreactors. Microbial kinetics of Escherichia coli including flow metabolism was determined in lab-scale batch and fed-batch experiments. The effect of high substrate fluctuations on metabolism was quantified in scale-down experiments. This knowledge was incorporated into a flow model based on the compartment model approach (CMA). The flow model was verified by mixing time experiments on aerated reactors mixed with multiple impellers at different regimes with liquid volumes 8-22 m(3). The integral model, predicting local glucose, acetate and biomass concentrations in different parts of the reactor, was compared to three large-scale fermentations performed in two different reactors. If lab-scale kinetics was used, the biomass prediction overestimated the biomass concentration. Lab-scale kinetics modified by the results of scale-down experiments incorporating the effect of substrate fluctuations gave a rather satisfying description of biomass concentration. Glucose gradients in different parts of the reactor and acetate produced as a result of overflow metabolism were predicted on a qualitative level. The simulations show that at present the decisive factor for a successful integration of fluid dynamics and microbial kinetics is the kinetics.

  • 46.
    Wang, Kui
    et al.
    College of Sciences, Henan Agricultural University, Nongye Road 63, 450002 Zhengzhou, China; Zhengzhou Public Utilities Investment Development Co., LTD, Shang Ding Road 89, 450016 Zhengzhou, China.
    Zhao, Hailiang
    School of Environmental Engineering, Henan University of Technology, Lianhua Street 100, 450001 Zhengzhou, China.
    Zhang, Yingming
    School of Environmental Engineering, Henan University of Technology, Lianhua Street 100, 450001 Zhengzhou, China.
    Li, Xu
    College of Sciences, Henan Agricultural University, Nongye Road 63, 450002 Zhengzhou, China.
    Xu, Mengyi
    College of Sciences, Henan Agricultural University, Nongye Road 63, 450002 Zhengzhou, China.
    Song, Meirong
    College of Sciences, Henan Agricultural University, Nongye Road 63, 450002 Zhengzhou, China.
    Ru, Guangxin
    College of Forestry, Henan Agricultural University, Nongye Road 63, Zhengzhou 450002, China.
    Jiang, Xiaolei
    College of Sciences, Henan Agricultural University, Nongye Road 63, 450002 Zhengzhou, China.
    Zhu, Xiuhong
    College of Forestry, Henan Agricultural University, Nongye Road 63, Zhengzhou 450002, China.
    Han, Dandan
    College of Sciences, Henan Agricultural University, Nongye Road 63, 450002 Zhengzhou, China.
    Dong, Yutao
    College of Sciences, Henan Agricultural University, Nongye Road 63, 450002 Zhengzhou, China.
    Shen, Kexin
    College of Sciences, Henan Agricultural University, Nongye Road 63, 450002 Zhengzhou, China.
    Pang, Xinchang
    Materials Science and Engineering, Zhengzhou University, Science Avenue 100, 450001 Zhengzhou, China.
    Li, Yuan
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Centra, Wallenberg Wood Science Center. KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Biokompositer.
    Zhang, Yixiang
    Zhengzhou Public Utilities Investment Development Co., LTD, Shang Ding Road 89, 450016 Zhengzhou, China.
    Sheng, Xia
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Centra, Wallenberg Wood Science Center. KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Biokompositer. College of Sciences, Henan Agricultural University, Nongye Road 63, 450002 Zhengzhou, China; Zhengzhou Public Utilities Investment Development Co., LTD, Shang Ding Road 89, 450016 Zhengzhou, China; Materials Science and Engineering, Zhengzhou University, Science Avenue 100, 450001 Zhengzhou, China; Huaxia Green Water Technology Co., LTD, Dongfeng South Road 36, 450046 Zhengzhou, China.
    Efficient electro-demulsification of O/W emulsions and simultaneous oil removal enabled by a multiscale porous biocarbon electrode2024Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 481, artikkel-id 148655Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Emulsion wastewater contain substantial amounts of oil and various additives, which pose threats to the environment and human health. Demulsification is a crucial pretreatment stage for wastewater. This study aims to identify a novel electro-demulsification method with high oil removal efficiency and low energy consumption. Modified carbonized birch wood with a unique isotropic multiscale pore structure is used as a self-standing electrode to treat a toluene oil-in-water (O/W) emulsion. The electrode must have a highly porous structure to facilitate efficient water diffusion and oil adsorption. It must also have high electronic conductivity to expedite polarized molecular electrophoresis to realize penetration into the pores and, subsequently, demulsification. Guided by an applied electric field force, polarized O/W droplets are drawn toward the electrode, revealing electrical characteristics distinct from those of polarized organic molecules. This electric field force augments the capture and adhesion of droplets by the electric double layer at the electrode interface. Consequently, adsorbed droplets in close proximity to the electrode rupture due to the combined influence of the electric field force and the electrostatic effects stemming from the electrode's multiscale porous structure. This synergistic action enables demulsification to occur efficiently at low energy consumption levels. This study has revealed that electro-demulsification can effectively treat toluene emulsions stabilized by various surfactants and microemulsion containing toluene. Therefore, this electro-demulsification technology can be further developed for various types of water pollution.

  • 47.
    Wang, Shule
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Wen, Yuming
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Shi, Ziyi
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Niedzwiecki, Lukasz
    Wroclaw Univ Sci & Technol, Wybrzeze Stanislawa Wyspianskiego 27, PL-50370 Wroclaw, Poland..
    Baranowski, Marcin
    Wroclaw Univ Sci & Technol, Wybrzeze Stanislawa Wyspianskiego 27, PL-50370 Wroclaw, Poland..
    Czerep, Michal
    Wroclaw Univ Sci & Technol, Wybrzeze Stanislawa Wyspianskiego 27, PL-50370 Wroclaw, Poland..
    Mu, Wangzhong
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Kruczek, Halina Pawlak
    Wroclaw Univ Sci & Technol, Wybrzeze Stanislawa Wyspianskiego 27, PL-50370 Wroclaw, Poland..
    Jönsson, Pär
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Yang, Weihong
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Effect of hydrothermal carbonization pretreatment on the pyrolysis behavior of the digestate of agricultural waste: A view on kinetics and thermodynamics2022Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 431, s. 133881-, artikkel-id 133881Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Anaerobic digestion is the most promising disposal methods to treat organic waste. Also, a feasible management is necessary for the resulted digestate. Hydrothermal carbonization (HTC) combination with pyrolysis could be a proper solution to use for the treatment of digestate. In this study, the effect of an HTC on the pyrolysis of the digestate of agricultural waste (AWD) was investigated, focusing on the kinetic and thermodynamic aspects. Three model-free methods, including Friedman, KAS, and OFW methods, were used to evaluate the kinetic performance of the total and pseudo pyrolytic reactions of AWD and its hydrochar. Furthermore, kinetic predictions were made to provide more information for further studies. It was found that the HTC treatment decreased the activation energy ranges of the pyrolysis of AWD from 182.9-274.43 kJ/mol to 144.59-205.20 kJ/mol by using the Friedman method. For a more thorough understanding of the effect of HTC treatment on the pyrolysis of AWD, the pyrolysis reactions of AWD and its hydrochar were divided into two pseudoreactions using the Fraser-Suzuki deconvolution method. The mean activation energy of the deduced pseudo 2 pyrolytic reaction of hydrochar was 175.64 kJ/mol, which was 28.11 kJ/mol less than that of AWD. In addition, the Delta H(double dagger )values of the pseudo 2 reactions of AWD and its hydrochar were 197.97 and 169.68 kJ/mol, respectively. The results of kinetic isothermal predictions suggested that the peak temperature for the further research and application of the pyrolysis of AWD and its hydmchar should not be lower than 450 degrees C.

  • 48.
    Wei, Xin-Feng
    et al.
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Polymera material. RISE Res Inst Sweden, Dept Polymers & Composites, SE-50115 Borås, Sweden.
    Rindzevicius, Tomas
    Tech Univ Denmark, Ctr Intelligent Drug Delivery & Sensing Using Mic, Dept Hlth Technol, DK-2800 Lyngby, Denmark..
    Wu, Kaiyu
    Shanghai Jiao Tong Univ, Dept Micro Nano Elect, Natl Key Lab Sci & Technol Micro Nano Fabricat, Shanghai 200240, Peoples R China..
    Bohlén, Martin
    RISE Res Inst Sweden, Dept Polymers & Composites, SE-50115 Borås, Sweden..
    Hedenqvist, Mikael S.
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Polymera material.
    Boisen, Anja
    Tech Univ Denmark, Ctr Intelligent Drug Delivery & Sensing Using Mic, Dept Hlth Technol, DK-2800 Lyngby, Denmark..
    Hakonen, Aron
    RISE Res Inst Sweden, Dept Chem Biomat & Text, SE-50115 Borås, Sweden.;Sensor Vis AB, SE-45522 Hisings Backa, Sweden..
    Visualizing undyed microplastic particles and fibers with plasmon-enhanced fluorescence2022Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 442, artikkel-id 136117Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Despite widespread awareness that enormous consumption of plastics is not sustainable, the global production and use of plastics continue to grow. This generates vast amounts of plastic waste and micmplastics, ending up e. g., in the marine environment. There are serious challenges in detecting and measuring microplastics, especially in highly diluted natural samples. Here, a new alternative microplastic detection method based on plasmon-enhanced fluorescence (PEF) was developed and tested using fluorescence microscopy. In particular, gold nanopillar-based substrates, displaying (i) high electromagnetic field enhancement, and (ii) surface super-hydrophobicity and high adhesion properties, were utilized to enhance the fluorescence emission signal from microplastics in water samples. The fluorescence microscopy imaging revealed remarkable fluorescence enhancement by the PEF substrates on the microplastic particles and fibers with different sizes of both conventional, low-density polyethylene, and biodegradable poly (butylene adipate-co-terephthalate). The limit of detection and quantification by this method was estimated to be as low as 0.35 and 1.2 femtograms, respectively. The observed fluorescence enhancement of the gold nanopillar substrates for the microplastics was ca. 70 times greater than the case of having the microplastics on a glass substrate. Additionally, 3D FEM simulations were performed to further investigate the system's electromagnetic field distribution near the nanostructures. This new method makes undyed microplastics visible in fluorescence microscopy, even particles and fibres too small to be imaged with conventional light microscopy. This can be a great tool for micmplastic research, helping us to detect, study, understand microplastic dynamics in water based systems.

  • 49.
    Wen, Yuming
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Shi, Ziyi
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Wang, Shule
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Mu, Wangzhong
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Strukturer.
    Jönsson, Pär
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Processer.
    Yang, Weihong
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Processer.
    Pyrolysis of raw and anaerobically digested organic fractions of municipal solid waste: Kinetics, thermodynamics, and product characterization2021Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 415, artikkel-id 129064Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Treating the solid residue after anaerobic digestion (AD) of the organic fraction of municipal solid waste (OFMSW) is currently a challenge. Here, pyrolysis is a promising way of recovering energy and materials from these solid residues. Thus, the objective of this study was to investigate the pyrolysis performance of these solid residues. The effect of AD on the pyrolysis of OFMSW was also studied. Thermogravimetry (TG), differential thermal analysis (DTA), and bench-scale pyrolysis experiments were performed by using OFMSW and anaembically digested OFMSW. Mathematical deconvolution analysis (MDA), model-free methods, and model-based methods were applied to study the kinetics. Thereafter, thermodynamic parameters were estimated based on the deduced kinetic results. The char, liquid, and permanent gas products from bench-scale experiments were characterized. The pyrolysis results show that the activation energies of the pseudoreactions of OFMSW are higher than those of the corresponding pseudoreactions of digestate. Moreover, the entropy reduction for digestate is larger than that for OFMSW. The characterization results of the products from the bench-scale experiments show that the interactions among feedstock components (lipids, lignocellulose, and proteins) during pyrolysis are enhanced by the application of AD. However, the pyrolysis yields of both heavy organics and gas are inhibited by the application of AD, while the char yield shows the opposite trend.

  • 50.
    Woldemariam, Daniel
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Kraft- och värmeteknologi.
    Kullab, Alaa
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Kraft- och värmeteknologi.
    Martin, Andrew
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Kraft- och värmeteknologi.
    Membrane distillation pilot plant trials with pharmaceutical residues and energy demand analysis2016Inngår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 306, s. 471-483Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this study, an air gap membrane distillation (AGMD) system at pilot scale is applied for purification of effluent from a municipal wastewater treatment plant. A district heating network (DHN) is considered as a heat source for the membrane distillation system. Removal performance of pharmaceutical residuals, specific heat demand, and economic assessments were analyzed on the membrane distillation plant. Almost all targeted pharmaceutical compounds were removed to a very high degree, often below the method detection limit. The heat requirement for the MD process could be sufficiently supplied by the low-temperature district heating return line. Specific heat demands for the AGMD ranges from 692 to 875 kWh/m3 without heat recovery and as low as 105 kWh/m3 when heat recovery is possible. Different approaches to integrating the MD within the DHN system were analyzed; the advantages and shortcomings of each are discussed with emphasis on the MD system’s capacity requirement and annual heat demand. The thermoeconomic analyses from this study presented the potential for energy optimization regarding heat recovery and module design improvement of the current MD equipment.

12 1 - 50 of 57
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf