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Removal of Chromium(VI) Using Surface Modified Superparamagnetic Iron Oxide Nanoparticles
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Functional Materials, FNM.
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Functional Materials, FNM.
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Functional Materials, FNM.ORCID iD: 0000-0001-5380-975X
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Functional Materials, FNM.
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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).

Place, publisher, year, edition, pages
2013. Vol. 48, no 8, 1243-1251 p.
Keyword [en]
adsorption, Chromium(VI), Cyanex-301, SPION
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-123435DOI: 10.1080/01496395.2012.734364ISI: 000318293700013Scopus ID: 2-s2.0-84877284511OAI: oai:DiVA.org:kth-123435DiVA: diva2:628685
Funder
EU, FP7, Seventh Framework Programme
Note

QC 20130614

Available from: 2013-06-14 Created: 2013-06-10 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Functionalized nanomaterials for the removal of chromium (VI) from aqueous solutions
Open this publication in new window or tab >>Functionalized nanomaterials for the removal of chromium (VI) from aqueous solutions
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
adsorption, chromium(VI), extractant, nanofiber, superparamagnetic iron oxide nanoparticle (SPION)
National Category
Engineering and Technology
Identifiers
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
Supervisors
Note

QC 20131219

Available from: 2013-12-19 Created: 2013-12-19Bibliographically approved
2. Application of Nanomaterials for the Removal of Hexavalent Chromium and their Biological Implications
Open this publication in new window or tab >>Application of Nanomaterials for the Removal of Hexavalent Chromium and their Biological Implications
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
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.

Place, publisher, year, edition, pages
KTH: KTH Royal Institute of Technology, 2016. 76 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2016:4
Keyword
Nanomaterials, Chromium, Biology
National Category
Engineering and Technology
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-179871 (URN)978-91-7595-813-2 (ISBN)
Public defence
2016-01-29, sal D2, Lindstedisvägen 5, KTH, Stockholm, 10:00 (English)
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Supervisors
Note

QC 20160111

Available from: 2016-01-11 Created: 2016-01-04 Last updated: 2016-01-11Bibliographically approved

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Saleemi, MohsinToprak, Muhammet S.

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