On the passivation mechanism of Fe3O4 nanoparticles during Cr(VI) removal from water: A XAFS study

On the passivation mechanism of Fe3O4 nanoparticles during Cr(VI) removal from water: A XAFS study Article history: X-Ray Absorption Spectroscopies (XAFS) are employed in order to gather a thorough insight on the uptake Received 18 September 2015 mechanism of Cr(VI) by Fe O nanoparticles under water treatment conditions. The XANES measure- 3 4 Received in revised form 6 November 2015 ments identify that the reducing potential of Fe O activates the precipitation of Cr(VI) in the form 3 4 Accepted 6 November 2015 of insoluble and non-toxic Cr(III). However, electron donation from Fe(II) is responsible for its gradual Available online 12 November 2015 consumption, resulting in the presence of a surface maghemite layer and the formation of structural vacancies. EXAFS analysis reveal that adsorption of Cr(III)-oxyanions occurs on sorption sites provided Keywords: by the vacancies in the maghemite layer, where Cr(III) is involved in a bidentate binuclear ( E) geometry Cr(VI) removal with Fe-octahedra while it also forms monodentate ( V) complexes with the Fe(III)O tetrahedra. The Fe O nanoparticles 3 4 surface maghemitization along with the reduced Cr(III) adsorption into the vacancies, tracks the degree Water treatment of Cr-reduction, since this surface structural modifications hinder Cr(VI) access to the Fe(II) ions of the EXAFS XANES magnetite nanoparticles. Thus, high surface coverage leads to http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied Surface Science Elsevier

On the passivation mechanism of Fe3O4 nanoparticles during Cr(VI) removal from water: A XAFS study

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Publisher
Elsevier
Copyright
Copyright © 2015 Elsevier B.V.
ISSN
0169-4332
eISSN
1873-5584
D.O.I.
10.1016/j.apsusc.2015.11.063
Publisher site
See Article on Publisher Site

Abstract

Article history: X-Ray Absorption Spectroscopies (XAFS) are employed in order to gather a thorough insight on the uptake Received 18 September 2015 mechanism of Cr(VI) by Fe O nanoparticles under water treatment conditions. The XANES measure- 3 4 Received in revised form 6 November 2015 ments identify that the reducing potential of Fe O activates the precipitation of Cr(VI) in the form 3 4 Accepted 6 November 2015 of insoluble and non-toxic Cr(III). However, electron donation from Fe(II) is responsible for its gradual Available online 12 November 2015 consumption, resulting in the presence of a surface maghemite layer and the formation of structural vacancies. EXAFS analysis reveal that adsorption of Cr(III)-oxyanions occurs on sorption sites provided Keywords: by the vacancies in the maghemite layer, where Cr(III) is involved in a bidentate binuclear ( E) geometry Cr(VI) removal with Fe-octahedra while it also forms monodentate ( V) complexes with the Fe(III)O tetrahedra. The Fe O nanoparticles 3 4 surface maghemitization along with the reduced Cr(III) adsorption into the vacancies, tracks the degree Water treatment of Cr-reduction, since this surface structural modifications hinder Cr(VI) access to the Fe(II) ions of the EXAFS XANES magnetite nanoparticles. Thus, high surface coverage leads to

Journal

Applied Surface ScienceElsevier

Published: Jan 1, 2016

References

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