kth.sePublications
Change search
Refine search result
1 - 14 of 14
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Aguilar-Sanchez, Andrea
    et al.
    Stockholm Univ, Div Mat & Environm Chem, Frescativagen 8, S-10691 Stockholm, Sweden..
    Jalvo, Blanca
    Stockholm Univ, Div Mat & Environm Chem, Frescativagen 8, S-10691 Stockholm, Sweden..
    Mautner, Andreas
    Univ Vienna, Fac Chem, Inst Mat Chem & Res, Polymer & Composite Engn PaCE Grp, Wahringer Str 42, A-1090 Vienna, Austria..
    Nameer, Samer
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Coating Technology.
    Pohler, Tiina
    VTT Tech Res Ctr Finland, Solut Nat Resources & Environm, POB 1000, FI-02044 Espoo, Finland..
    Tammelin, Tekla
    VTT Tech Res Ctr Finland, Solut Nat Resources & Environm, POB 1000, FI-02044 Espoo, Finland..
    Mathew, Aji P.
    Stockholm Univ, Div Mat & Environm Chem, Frescativagen 8, S-10691 Stockholm, Sweden..
    Waterborne nanocellulose coatings for improving the antifouling and antibacterial properties of polyethersulfone membranes2021In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 620, article id 118842Article in journal (Refereed)
    Abstract [en]

    This article presents a waterborne nanocellulose coating process to change the surface characteristics and mitigate fouling of commercially available polyethersulfone (PES) microfiltration membranes. An extensive comparative study between nanoporous and nano-textured layers composed of cellulose nanocrystals (CNC) or TEMPO-oxidized cellulose nanofibrils (T-CNF), which were coated on the PES membrane by taking advantage of the electrostatic interactions between the PES substrate, a polyallylamine hydrochloride (PAHC1) anchoring layer, and the nanocellulose functional layer. Coated PES membranes exhibited decreased surface roughness and pore sizes as well as rejection of compounds with a M-w above 150 kDa, while the water permeability and mechanical properties of remained largely unaffected. The coatings improved the wettability as confirmed by a reduction of the contact angle by up to 52% and exhibited a higher negative surface charge compared to the uncoated membranes over a pH range of 4-8. A significant reduction in organic fouling was observed for the coated membranes demonstrated by bovine serum albumin (BSA) adsorption studies on T-CNF and CNC surfaces using Quartz Crystal Microbalance with Dissipation monitoring (QCM-D), UV-vis spectroscopy and FTIR mapping after exposing the membranes to dynamic adsorption of BSA. The T-CNF coating exhibited effective antibacterial action against Escherichia coli (E. coli) attributed to the pH reduction effect induced by the carboxyl groups; while CNC coatings did not show this property. This work demonstrates a simple, green, and easy-to-scale layer-by-layer coating process to tune the membrane rejection and to improve antifouling and antibacterial properties of commercially available membranes.

  • 2.
    Dong, Qian
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Corrosion Science.
    An experimental method to identify various oxygen species transported in oxides2007In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 306, no 1-2, p. 166-172Article in journal (Refereed)
    Abstract [en]

    Oxygen transport in oxides can take place in molecular, atomic and ionic form. An experimental method is described which separates the contributions of molecules, atoms and ions to the overall oxygen transport in oxides. The method comprises gas phase analysis and the use of oxygen isotopes O-16 and O-18. In the general case, exposure to non-equilibrated O-2 containing 60-70% O-18 is optimal to obtain the highest accuracy in the measurement. The method is exemplified by distinguishing non-ionic (molecular and atomic) oxygen transport from ionic oxygen transport in a commercial yttria-stabilized zirconia (YSZ) sample in the temperature range of 600-900 degrees C. There is approximately 35% molecular, 20% atomic transport and 45% ionic oxygen transport in YSZ at 600 degrees C. It is found that the fraction percent of non-ionic oxygen transport decreases with increasing temperature, and ionic oxygen transport increases sharply with increasing temperature.

  • 3.
    Essalhi, Mohamed
    et al.
    Department of Chemistry, Umeå University, 90187, Umeå, Sweden.; African Sustainable Agriculture Research Institute (ASARI), Mohammed VI Polytechnic University (UM6P), Laayoune, 70000, Morocco.
    Afsar, Noor Ul
    Department of Chemistry, Umeå University, 90187, Umeå, Sweden..
    Bouyer, Denis
    Institut Europeen des Membranes, IEM, UMR 5635, ENSCM, CNRS, Univ Montpellier, Montpellier, France.
    Sundman, Ola
    Department of Chemistry, Umeå University, 90187, Umeå, Sweden..
    Holmboe, Michael
    Department of Chemistry, Umeå University, 90187, Umeå, Sweden..
    Khayet, Mohamed
    Department of Structure of Matter, Thermal Physics and Electronics, Faculty of Physics, University Complutense of Madrid, Avda. Complutense s/n, 28040, Madrid, Spain., Avda. Complutense s/n.
    Jonsson, Mats
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Applied Physical Chemistry.
    Tavajohi, Naser
    Department of Chemistry, Umeå University, 90187, Umeå, Sweden..
    Gamma-irradiated janus electrospun nanofiber membranes for desalination and nuclear wastewater treatment2024In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 700, article id 122726Article in journal (Refereed)
    Abstract [en]

    This study presents the fabrication of double-layer electrospun nanofibrous membranes (DL-ENMs) using polyvinylidene fluoride (PVDF) and polyether sulfone (PES) based polymers with different degrees of hydrophilicity (PES, sulfonated PES, and PES with hydroxyl terminals). A comparative analysis was carried out with single-layer electrospun nanofiber membranes (SL-ENM) with a total thickness of about 375 μm. Using feed solutions, including sodium chloride, sodium nitrate, and simulated nuclear wastewater (SNWW), the performance of DL-ENMs was evaluated for desalination and radionuclide decontamination by direct contact membrane distillation (DCMD) and air gap membrane distillation (AGMD) techniques. The results showed that DL-ENMs, especially those incorporating a sulfonated PES-based hydrophilic layer, exhibited superior permeate fluxes, reaching values of 72.72 kg/m2.h and 73.27 kg/m2.h in the DCMD using aqueous feed solutions of NaCl and NaNO3, respectively, and 70.80 kg/m2.h and 41.96 kg/m2.h using aqueous feed solutions of SNWW in DCMD and AGMD, respectively. Both SL-ENMs and DL-ENMs exhibited high rejection efficiencies and decontamination factors for the feed solutions (>99.9%). In addition, the prepared ENMs were exposed to gamma radiation to evaluate their applicability in real-life applications. The result of irradiation revealed the negative impact of gamma radiation on the fluorine content of PVDF which could be a critical point in using PVDF as a hydrophobic material for decontaminating nuclear wastewater by membrane distillation.

  • 4.
    Khataee, Amirreza
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry.
    Nederstedt, Hannes
    Lund Univ, Dept Chem, POB 124, SE-22100 Lund, Sweden..
    Jannasch, Patric
    Lund Univ, Dept Chem, POB 124, SE-22100 Lund, Sweden..
    Lindström, Rakel
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry.
    Poly(arylene alkylene)s functionalized with perfluorosulfonic acid groups as proton exchange membranes for vanadium redox flow batteries2023In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 671, article id 121390Article in journal (Refereed)
    Abstract [en]

    With the aim to develop vanadium redox flow battery (VRFB) membranes beyond state of the art, we have in the present work functionalized poly(p-terphenylene)s with highly acidic perfluorosulfonic groups and investigated their performance as proton exchange membranes (PEMs). Consequently, two poly(p-terphenylene alkylene)s tethered with perfluoroalkylsulfonic acid and perfluorophenylsulfonic acid, respectively, were synthesized through superacid-mediated polyhydroxyalkylations and cast into PEMs. Compared with Nafion 212, the PEM carrying perfluorophenylsulfonic acid groups (PTPF-Phenyl-SA) was found to exhibit higher ionic conductivity and eight times lower vanadium (IV) permeation rate. The latter explains the longer self-discharge duration of the VRFB based on the PTPF-Phenyl-SA. In addition, the VRFB assembled with the PTPF-Phenyl-SA PEM exhibited a high average coulombic efficiency of 99.6% for over 100 cycles with a capacity fade of 0.24% per cycle, which was 50% lower than when Nafion 212 was used. More importantly, excellent capacity retention was achieved through electrochemical rate performance experiments at different current densities.

  • 5. Lewis, William J. T.
    et al.
    Mattsson, Tuve
    KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center. Chalmers University of Technology, Sweden.
    Chew, Y. M. John
    Bird, Michael R.
    Investigation of cake fouling and pore blocking phenomena using fluid dynamic gauging and critical flux models2017In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 533, p. 38-47Article in journal (Refereed)
    Abstract [en]

    Cake growth during a low pressure cross-flow microfiltration (MF) of a Kraft lignin suspension was studied using fluid dynamic gauging (FDG). This is the first paper to discuss the identification of fouling mechanisms and their transition points based on simultaneous, in situ and in real-time FDG measurements of cake layer thickness and flux. The FDG results were used to quantify the significance of membrane pore-level fouling phenomena which occur at an early stage of the filtration. A flux decline of approximately 75% was attributed to membrane pore fouling i.e. deposition on the surface of the membrane which caused direct blocking of the membrane pores. We present here a novel toolset for quick and achievable diagnosis of membrane fouling mechanisms, which can accelerate innovations in membrane technology and process optimisation. Furthermore, this innovative approach showed good agreement with a mathematical approach, based on a critical flux model, which was applied to raw flux data. In addition to cake thickness measurements, destructive strength testing of the fouling layer showed an increase in cohesive strength over time. The results showed that filter cakes formed by Kraft lignin become harder to remove by shear stress as they become thicker during the course of the filtration. A removal mechanism for lignin layer under stress is also proposed. The methodology described here can be applied to rapidly predict and assess routes to performance improvements in cross-flow MF.

  • 6.
    Lv, Yuexia
    et al.
    Key Laboratory of Pressurized Systems and Safety, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology.
    Yu, Xinhai
    Key Laboratory of Pressurized Systems and Safety, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology.
    Tu, Shan-Tung
    Key Laboratory of Pressurized Systems and Safety, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology.
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
    Dahlquist, Erik
    School of Sustainable Development of Society and Technology, Mälardalen University.
    Wetting of polypropylene hollow fiber membrane contactors2010In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 362, no 1-2, p. 444-452Article in journal (Refereed)
    Abstract [en]

    Membrane wetting by absorbents leads to an Increase in mass transfer resistance and a deterioration in CO2 absorption performance during the membrane gas absorption process In order to better understand the wetting mechanism of membrane pores during their prolonged contact with adsorbents, polypropylene (PP) hollow fibers were Immersed in three different absorbents for up to 90 days Monoethanolamine, methyldiethanolamine, and deionized water were applied as absorbent solutions The characterization results of membrane samples confirm that the absorbent molecules diffuse into PP polymers during the exposure process, resulting in the swelling of the membranes The absorption-swelling wetting mechanism is proposed to explain observations made during the wetting process The strong reduction of contact angles indicates that the membrane surface hydrophobicity decreases remarkably during immersion due to membrane-absorbent interaction Membrane surface morphologies and surface roughness suffer from significant and complicated changes after immersing the membrane fibers in the absorbents. Immersion in an absorbent with a high surface tension results in small changes in membrane surface morphology. As indicated by the experimental results, improving membrane surface hydrophobicity may be an effective way of overcoming wetting problems.

  • 7.
    Noor, Imtisal-e-
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Coenen, J.
    Martin, Andrew R.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Dahl, O.
    Åslin, M.
    Experimental investigation and techno-economic analysis of tetramethylammonium hydroxide removal from wastewater in nano-electronics manufacturing via membrane distillation2019In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 579, p. 283-293Article in journal (Refereed)
    Abstract [en]

    In nano-electronics manufacturing, tetramethylammonium hydroxide (TMAH) is extensively used in the photo-lithography and etching processes, leading to a waste disposal issue. The present study focuses on TMAH wastewater treatment in nano-electronics industries by using membrane distillation technology. Actual TMAH wastewater samples were collected at imec, Belgium. An air gap membrane distillation bench unit was employed to perform the experiments for different operating conditions i.e., feed temperatures and flow rates. High quality water is recovered after reducing the TMAH concentration to 1 ppm and lowering the TOC to 0.8 ppm from 8 ppm. For the industrial scale TMAH wastewater treatment, industrial waste heat driven and district heating driven membrane distillation systems are designed and analyzed. It is determined that 14 GWh thermal energy is required annually to treat 20,000 m 3 of TMAH wastewater/year while considering 65 °C as the membrane distillation feed temperature. Expected unit water treatment cost is found as low as 16 $/m 3 of TMAH wastewater, roughly 80% lower than current disposal costs.

  • 8.
    Owusu-Agyeman, Isaac
    et al.
    Karlsruhe Institute of Technology (KIT), Germany.
    Jeihanipour, Azam
    Luxbacher, Thomas
    Schäfer, Andrea Iris
    Implications of humic acid, inorganic carbon and speciation on fluoride retention mechanisms in nanofiltration and reverse osmosis2017In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 528, p. 82-94Article in journal (Refereed)
    Abstract [en]

    The impact of pH and humic acid (HA) on the retention of fluoride (F) and inorganic carbon (IC) by nanofiltration (NF) and reverse osmosis (RO) membranes was determined. Synthetic waters were prepared using realistic ranges of F, IC and HA for carbonaceous waters found for example in the fluoride rich waters in Tanzania. These waters were filtered using NF270 and BW30 membranes to determine retention mechanisms. IC changes speciation with pH. The dominant species at pH < 6, 6-10 and > 10 are H2CO3, HCO3 and CO32- respectively. This results in changes in charge and size of the hydrated ion radius. The mechanism for IC retention by the NF270 and BW30 membranes are charge repulsion and size exclusion, respectively. F retention increases with pH. IC influenced F retention at pH > 10 where IC exists as divalent CO32- and is retained more easily than the monovalent F. HA enhances the retention of F by NF/RO membranes under certain conditions. The enhancement effect is more pronounced at neutral than at acidic pH and basic pH. The mechanism for the enhancement is attributed to the change in surface charge of the membranes by adsorption of HA. At high HA concentration the F retention enhancement is annulled by deposit formation on the membrane. The results obtained in this study indicate the complexity of retention in real surface- and ground waters that can alter significantly in pH as well as IC and HA content. The research is situated in the context of developing membrane technologies for autonomous systems in remote locations where water quality is variable and mechanisms of membrane performance are poorly understood.

  • 9. Rezzadori, Katia
    et al.
    Penha, Frederico Marques
    Univ Fed Santa Catarina, Dept Chem & Food Engn, BR-88040970 Florianopolis, SC, Brazil.
    Proner, Mariane Carolina
    Zin, Guilherme
    Cunha Petrus, Jose Carlos
    Pradanos, Pedro
    Palacio, Laura
    Hernandez, Antonio
    Di Luccio, Marco
    Evaluation of reverse osmosis and nanofiltration membranes performance in the permeation of organic solvents2015In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 492, p. 478-489Article in journal (Refereed)
    Abstract [en]

    The aim of this study was to evaluate the influence of different solvents and time conditionings in the permeation of n-hexane and oil/n-hexane solutions through several reverse osmosis (ORAK - Osmonics, BW30 - Dow Filmtec) and nanofiltration (NF270 - Dow Filmtec, NP030 - Microdyn Nadir) polymeric membranes. The study of the influence of membrane conditioning on the n-hexane flux was carried out using different solvents (n-hexane, ethanol, n-propanol, iso-propanol and butanol) as pretreating agents in different time intervals. Membrane performance was tested by measuring n-hexane fluxes and rejections of dissolved castor oil. The conditioning with ethanol increased n-hexane fluxes in the polyamide membranes ORAK, NF270 and BW30, while the polyethersullone membrane NP030 did not present any increase in permeability. An increase in contact angle after membrane conditioning was detected, as well as a reduction in free surface energy. This suggests that pretreatment steps alter the surface hydrophilic character. Salt rejections for all the membranes decreased after the pretreatments and permeation with n-hexane for 8 h. These rejections dropped from 87-99% to 72-77% for membranes NF270, NP030 and BW30; and from 99% to 88% for ORAK, which showed better stability to solvent exposure. For castor oil, the highest retention was 60% for reverse osmosis membrane ORAK. The results obtained in this work with commercial RO and NF membranes, normally used in aqueous solutions operations, indicate that most of these membranes do not present adequate stability towards nonaqueous solvents.

  • 10. Rezzadori, Katia
    et al.
    Veneral, Josamaique Gilson
    Silveira, Julia Carolina Medeiros
    Penha, Frederico Marques
    Univ Fed Santa Catarina, EQA CTC UFSC, Chem & Food Engn Dept, BR-88040900 Florianopolis, SC, Brazil.
    Cunha Petals, Jose Carlos
    Pradanos, Pedro
    Palacio, Laura
    Hernandez, Antonio
    Di Luccio, Marco
    Effect of dense CO2 on polymeric reverse osmosis and nanofiltration membranes and permeation of mixtures of macauba oil (Acrocomia aculeata) and CO22015In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 481, p. 195-206Article in journal (Refereed)
    Abstract [en]

    The performance of four commercial membranes upon subcritical and supercritical CO2 treatments have been characterised by different methods. The membranes were treated up to 8 h in static process, using two different conditions (18 MPa/313.15 K - supercritical and 8 MPa/293.15 K - subcritical). The possible changes in membrane characteristics were investigated by atomic force microscopy (AFM), contact angle and surface free energy, thermogravimetric analysis (TGA), scanning electronic microscopy (SEM). Membrane performance was also evaluated by measuring CO2 flux ancl macauba oil retention factors. Changes in membrane roughness ancl in contact angles were observed for all membranes after sub and supercritical CO2 treatments. Moreover, the surface free energy and the polar component showed a decrease after CO2 exposure, confirming an increase in surface hydrophobicity of membranes detected from contact angle results. This empowerment of hydrophobicity is associated mainly with the CO2-polymer interaction. Other intra and interchain effects should not affect the thermal stability leaving TGA results unchanged after CO2 exposure. ORAK and NP030 membranes showed high macauba oil retentions; 95% and 85%, respectively in supercritical condition. This latter revealed to cause important changes in the membranes due to the higher solubility of CO2 in polymeric matrix at this condition. However, the selectivity was not changed and it is possible to use commercial polymeric membranes in supercritical systems for CO2 regeneration and partial fatty acid fractioning.

  • 11. Salazar-Alvarez, G.
    et al.
    Bautista-Flores, A. N.
    Miguel, E. R. D.
    Muhammed, Mamoun
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    de Gyves, J.
    Transport characterisation of a PIM system used for the extraction of Pb(II) using D2EHPA as carrier2005In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 250, no 02-jan, p. 247-257Article in journal (Refereed)
    Abstract [en]

    The facilitated transport of lead(II) through polymeric inclusion membranes consisting of cellulose triacetate as polymeric support, his(2-ethylhexyl)-phosphoric acid (D2EHPA) as carrier, and tris-(2-butoxyethyl)phosphate as plasticiser (TBEP), is investigated. The influence of some of the aqueous and membrane components on the permeability of Pb(II) was studied. The maximum flux obtained with these membranes is 3.5 x 10(-6) mol m(-2) s(-1), which is of the same order of magnitude of those reported for supported liquid membranes and is in the upper range of those reported for polymeric inclusion membranes. Aqueous and membranes resistances were determined from a model that describes the transport mechanism across the membranes using the stoichiometric relationship Ph R(2)2HR and the extraction equilibrium constant value of 6.2 x 10(-4) determined independently by solid-liquid extraction. An activation energy of I I kJ mol(-1) was also determined for Pb(II) migration, which suggest that the transport of Pb(II) is controlled by a membrane diffusion mechanism. Membrane characterisation was per-formed using several techniques including atomic force microscopy, scanning electron microscopy coupled with energy-dispersive spectroscopy, and thermal analysis.

  • 12. Shi, Wenbin
    et al.
    Zhang, Linjun
    Deng, Jie
    Wang, Dongsheng
    Sun, Shudong
    Zhao, Weifeng
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology. Sichuan University, China.
    Zhao, Changsheng
    Redox-responsive polymeric membranes via supermolecular host-guest interactions2015In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 480, p. 139-152Article in journal (Refereed)
    Abstract [en]

    Redox-responsive materials have attracted much attention, and redox-responsive membrane is strongly desired since enormous numbers of redox reactions carry out in living systems. Herein, a novel polymeric membrane with redox-resposive hydraulic permeability is fabricated by introducing a reversible redox-responsive system based on the host guest complex between ferrocene (Fc) and beta-cyclodextrin (1 CD) into polyethersulfone (PES) membrane. As the result of reversible radox-responsive formation or deformation of the complex, the water flux for the membrane with 18.3 wt% redox-responsive materials was 270 mL/m(2) mmHg h in original state, while increased to 1022 mL/m(2) mmHg h in oxidation state and decreased to 538 mL/m(2) mmHg h in reduction state. In addition, the results of water contact angle, surface zeta potential and the gas flow/liquid displacement confirmed that the origin of the reclox-responsive hydraulic permeability were the change of the pore size and porosity for the modified membranes. The redox-responsive membranes have great potential to be utilized in the Fields of chemical detection, drug delivery, biological treatments and so On.

  • 13.
    Uheida, Abdusalam
    et al.
    KTH, Superseded Departments (pre-2005), Materials Science and Engineering.
    Zhang, Yu
    KTH, Superseded Departments (pre-2005), Chemistry.
    Muhammed, Mamoun
    KTH, Superseded Departments (pre-2005), Materials Science and Engineering.
    Transport of palladium(II) through hollow fiber supported liquid membrane facilitated by nonylthiourea2004In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 241, no 2, p. 289-295Article in journal (Refereed)
    Abstract [en]

    The facilitated transport of Pd(II) from chloride media has been investigated through a hollow-fiber supported liquid membrane using nonylthiourea (NTH) as a carrier. The influence of the chemical conditions on the permeability of Pd(II) is reported. A model is presented that describes the transport mechanism, consisting of diffusion through a feed aqueous diffusion layer, a fast interfacial chemical reaction, and diffusion of carrier and its metal complex through the organic membrane. The diffusion resistances through organic membrane (Delta(org)) and through aqueous layer (Delta(aq)), respectively, have been calculated from the proposed model. The permeability of Pd(II) seems to be governed by the diffusion of Pd(II) species through the hollow fiber supported liquid membrane with PdCl2(NTH)(2) as a predominant carrier and PdCl2(NTH)to a lesser extent, though both have similar diffusion coefficients.

  • 14. Yu, X.
    et al.
    An, L.
    Yang, J.
    Tu, S. -T
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes. Mälardalen University, Sweden.
    CO2 capture using a superhydrophobic ceramic membrane contactor2015In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 496, p. 1-12, article id 13949Article in journal (Refereed)
    Abstract [en]

    The wetting and fouling of a membrane contactor deteriorated performance of the membrane gas absorption system for CO<inf>2</inf> post-combustion capture in coal-fired power plants. To solve these problems, in this study, a superhydrophobic ceramic (SC) membrane contactor was fabricated from an alumina tube with a ZrO<inf>2</inf> layer by means of grafting with fluoroalkylsilane (FAS) in a triethoxy-1H,1H,2H,2H-tridecafluoro-n-octylsilane solution. The performances of the SC membrane contactor and polypropylene (PP) hollow fiber membrane contactor were compared through experiments conducted in a CO<inf>2</inf> absorption experimental system using a monoethanolamine (MEA) aqueous solution. Although the membrane fabrication cost per effective membrane area (CPA) of the SC membrane is 12.5 times that of the PP hollow fiber membrane, the SC membrane fabrication cost per absorbed CO<inf>2</inf> flux (CPC) was lower than that of the PP membrane. For the SC membrane, the detrimental effect of wetting can be alleviated by periodic drying to ensure a high CO<inf>2</inf> removal efficiency (>90%). Drying does not work for the PP membrane because the swelling of the PP fibers is irreversible. The SC membrane contactor exhibited a better anti-fouling ability than the PP membrane contactor because the superhydrophobic surface can self-clean. To ensure a continuous, high-efficiency CO<inf>2</inf> removal, a method was proposed in which two-hollow fiber SC membrane contactors operate alternately with the addition of periodic drying. The SC hollow fiber membrane contactor shows great potential in real industrial CO<inf>2</inf> post-combustion capture because of its good anti-wetting and anti-fouling features.

1 - 14 of 14
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf