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Functionalized nanomaterials for the removal of chromium (VI) from aqueous solutions
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Functional Materials, FNM.
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. , 76 p.
Series
Trita-ICT/MAP AVH, ISSN 1653-7610 ; 2013:07
Keyword [en]
adsorption, chromium(VI), extractant, nanofiber, superparamagnetic iron oxide nanoparticle (SPION)
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-138512ISBN: 978-91-7501-954-3 (print)OAI: oai:DiVA.org:kth-138512DiVA: diva2:681215
Presentation
2013-12-18, Sal/Hall Darlington, Electrum, KTH-ICT, Isafjordsgatan 26, Kista, 11:00
Opponent
Supervisors
Note

QC 20131219

Available from: 2013-12-19 Created: 2013-12-19Bibliographically approved
List of papers
1. Removal of Chromium(VI) Using Surface Modified Superparamagnetic Iron Oxide Nanoparticles
Open this publication in new window or tab >>Removal of Chromium(VI) Using Surface Modified Superparamagnetic Iron Oxide Nanoparticles
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2013 (English)In: Separation science and technology (Print), ISSN 0149-6395, E-ISSN 1520-5754, Vol. 48, no 8, 1243-1251 p.Article in journal (Refereed) Published
Abstract [en]

This study describes the removal of Chromium(VI) from aqueous solutions using surface tailored superparamagnetic iron oxide nanoparticles (SPION) coated with bis(2,4,4-trimethylpentyl)dithiophosphinic acid (Cyanex-301). The synthesized Cyanex-301 coated SPION has been characterized by Transmission Electron Microscopy (TEM), Fourier-Transfer Infrared Spectroscopy (FT-IR), X-ray Photonic Spectroscopy (XPS), and Thermogravimetric Analysis (TGA). The adsorption mechanism was proposed to be via complexation between the thiol group on Cyanex-301 and Cr(VI) ions based on the XPS and FTIR analysis. It has been found that the equilibrium can be attained in less than 2hr. The adsorption behavior of Cr(VI) on the Cyanex-301 coated SPION can be well described by the Langmuir model and the maximum adsorption capacity for Cr(VI) was estimated to be 30.8mg/g. The selectivity of the Cyanex-301 coated SPION adsorbent towards Cr(VI) ions was found to be high and the maximum loading capacity obtained is up to an order of magnitude higher than that of other adsorbents reported in the literature. The desorption studies showed that more than 70% of Cr(VI) can be recovered using HNO3 as eluting solution. Our findings suggest a high potential of the designed adsorbent material for the treatment of industrial wastewater containing Cr(VI).

Keyword
adsorption, Chromium(VI), Cyanex-301, SPION
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-123435 (URN)10.1080/01496395.2012.734364 (DOI)000318293700013 ()2-s2.0-84877284511 (Scopus ID)
Funder
EU, FP7, Seventh Framework Programme
Note

QC 20130614

Available from: 2013-06-14 Created: 2013-06-10 Last updated: 2017-12-06Bibliographically approved
2. Studies on the adsorption of chromium(VI) onto 3-Mercaptopropionic acid coated superparamagnetic iron oxide nanoparticles
Open this publication in new window or tab >>Studies on the adsorption of chromium(VI) onto 3-Mercaptopropionic acid coated superparamagnetic iron oxide nanoparticles
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2014 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 425, 36-43 p.Article in journal (Refereed) 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).

Keyword
SPION, Chromium, 3-Mercaptopropionic acid, Adsorption
National Category
Other Chemistry Topics
Identifiers
urn:nbn:se:kth:diva-138311 (URN)10.1016/j.jcis.2014.03.025 (DOI)000335620500006 ()2-s2.0-84897518040 (Scopus ID)
Funder
EU, FP7, Seventh Framework Programme
Note

QC 20140609. Updated from submitted to published.

Available from: 2013-12-18 Created: 2013-12-18 Last updated: 2017-12-06Bibliographically approved
3. Surface functionalized nanofibers for the removal of chromium(VI) from aqueous solutions
Open this publication in new window or tab >>Surface functionalized nanofibers for the removal of chromium(VI) from aqueous solutions
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2014 (English)In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 245, 201-209 p.Article in journal (Refereed) Published
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.

Keyword
Nanofibers, Polyacrylonitrile, Adsorption, Chromium
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-138316 (URN)10.1016/j.cej.2014.02.034 (DOI)000335275200025 ()2-s2.0-84896750603 (Scopus ID)
Note

QC 20140611. Updated from submitted to published.

Available from: 2013-12-18 Created: 2013-12-18 Last updated: 2017-12-06Bibliographically approved

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