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Studies on the adsorption of chromium(VI) onto 3-Mercaptopropionic acid coated superparamagnetic iron oxide nanoparticles
KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Funktionella material, FNM.
KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Funktionella material, FNM.
Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, Sweden.
KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Materialfysik, MF.
Visa övriga samt affilieringar
2014 (Engelska)Ingår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 425, s. 36-43Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Chromium (Cr) in the form of Cr(VI) is deemed toxic in water due to its mutagenic and carcinogenic properties. For the successful removal of Cr(VI), we demonstrate a novel adsorbent consisting of superparamagnetic iron oxide nanoparticles (SPION) functionalized with 3-Mercaptopropionic acid (3-MPA). Fourier transform infrared spectroscopy (FT-IR) confirmed the functionalization of nanoparticles and presence of sulfonate groups. Batch adsorption experiments showed that the functionalized adsorbent recovered 45 mg of Cr(VI)/g of 3-MPA coated SPION at initial concentration of 50 mg/L aqueous solution at pH 1 with less than 1% of Fe dissolution from SPION. The results from X-ray photoelectron spectroscopy confirmed that Cr(VI) chemisorbed onto the adsorbent. Hence, the XPS spectra did not indicate any reduction of Cr(VI) to Cr(III) upon adsorption. The adsorption data were better fitted for the Freundlich model. Moreover, the Cr(VI) adsorption kinetics on functionalized SPION followed a pseudo-second order rate, revealing chemisorption as the dominant mechanism. The high Cr(VI) removal, rapid adsorption kinetics and stability of adsorbent indicate that 3-MPA coated SPION could be an efficient adsorbent for the removal of Cr(VI).

Ort, förlag, år, upplaga, sidor
2014. Vol. 425, s. 36-43
Nyckelord [en]
SPION, Chromium, 3-Mercaptopropionic acid, Adsorption
Nationell ämneskategori
Annan kemi
Identifikatorer
URN: urn:nbn:se:kth:diva-138311DOI: 10.1016/j.jcis.2014.03.025ISI: 000335620500006Scopus ID: 2-s2.0-84897518040OAI: oai:DiVA.org:kth-138311DiVA, id: diva2:680831
Forskningsfinansiär
EU, FP7, Sjunde ramprogrammet
Anmärkning

QC 20140609. Updated from submitted to published.

Tillgänglig från: 2013-12-18 Skapad: 2013-12-18 Senast uppdaterad: 2017-12-06Bibliografiskt granskad
Ingår i avhandling
1. Functionalized nanomaterials for the removal of chromium (VI) from aqueous solutions
Öppna denna publikation i ny flik eller fönster >>Functionalized nanomaterials for the removal of chromium (VI) from aqueous solutions
2013 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2013. s. 76
Serie
Trita-ICT/MAP AVH, ISSN 1653-7610 ; 2013:07
Nyckelord
adsorption, chromium(VI), extractant, nanofiber, superparamagnetic iron oxide nanoparticle (SPION)
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:kth:diva-138512 (URN)978-91-7501-954-3 (ISBN)
Presentation
2013-12-18, Sal/Hall Darlington, Electrum, KTH-ICT, Isafjordsgatan 26, Kista, 11:00
Opponent
Handledare
Anmärkning

QC 20131219

Tillgänglig från: 2013-12-19 Skapad: 2013-12-19Bibliografiskt granskad
2. Application of Nanomaterials for the Removal of Hexavalent Chromium and their Biological Implications
Öppna denna publikation i ny flik eller fönster >>Application of Nanomaterials for the Removal of Hexavalent Chromium and their Biological Implications
2016 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The International Agency for Research on Cancer (IARC) stated that chromium in the form of Cr(VI) has been deemed to be a class-A human carcinogen. It has been a major contaminant associated with wastewater. Moreover, the existence of heavy metals in aquatic systems is a critical concern for the environment as well as industries that manufacture or consume these particular elements. In order to remove these particular toxic metals, several well-known conventional methods including ion-exchange, filtration and adsorption are used. Amongst these methods, adsorption offers significant advantages such as the low-cost materials, ease of operation and efficiency in comparison to the other conventional methods.

The aim of this work was to develop nanomaterials (particles and fibers) to address some critical issues for the treatment of heavy metals, especially chromium in aqueous systems. Furthermore, the use of nanomaterials and how they relate to nanoscale operations at the biological level has generated considerable concerns in spite of their novel properties.

The first part of this thesis deals with the synthesis and characterizations of Fe3O4, magnetite, as nanoparticles which were further coated with surfactants bis(2,4,4-trimethylpentyl)dithiophosphinic acid, Cyanex-301, and 3-Mercaptopropionic acid with the active compound being the thiol (SH) groups, that will suffice as a viable material for Cr(VI) removal from aqueous solutions. The proposed mechanism was the complexation between the thiol group on Cyanex-301 and 3-Mercaptopropionic acid, respectively. The effect of different parameters on the adsorption including contact time, initial and final Cr(VI) ion concentration and solution pH was investigated.

The second part of this thesis encompassed the fabrication of flexible nanocomposite materials, with a large surface area and architecture for the removal of Cr(VI) in batch and continuous flow mode. A technique known as electrospinning was used to produce the nanofibers. The flexible yet functional materials architecture has been achieved by growing ZnO nanorod arrays through chemical bath deposition on synthesized electrospun poly-L-lactide nanofibers. Moreover, polyacrylonitrile nanofibers (PAN) were synthesized and adapted by the addition of hydroxylamine hydrochloride to produce amidoxime polyacrylonitrile nanofibers (A-PAN). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to identify the morphologies and particle sizes whereas Fourier-Transform Infrared spectroscopy (FT-IR) was used to identify either the presence or absence of functional groups for the formation of PAN and A-PAN nanofibers. The optimization of functionalized nanoadsorbents to adsorb Cr(VI) was also carried out to investigate the effect of experimental parameters: contact time, solution pH, initial, final and other metal ion concentration. Commercially manufactured pristine engineered (TiO2, ZnO and SiO2) nanoparticles and lab-made functionalized (Fe3O4 and CeO2) nanoparticles were studied while the powders were suspended in appropriate media by Dynamic Light Scattering (DLS) to identify their cytotoxicity effects.

Ort, förlag, år, upplaga, sidor
KTH: KTH Royal Institute of Technology, 2016. s. 76
Serie
TRITA-CHE-Report, ISSN 1654-1081 ; 2016:4
Nyckelord
Nanomaterials, Chromium, Biology
Nationell ämneskategori
Teknik och teknologier
Forskningsämne
Kemiteknik
Identifikatorer
urn:nbn:se:kth:diva-179871 (URN)978-91-7595-813-2 (ISBN)
Disputation
2016-01-29, sal D2, Lindstedisvägen 5, KTH, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 20160111

Tillgänglig från: 2016-01-11 Skapad: 2016-01-04 Senast uppdaterad: 2016-01-11Bibliografiskt granskad

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