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
Applied Surface Science – Elsevier
Published: Jan 1, 2016
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