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The effect of different divalent cations on the reduction of hexavalent chromium by zerovalent iron

Paper ID Volume ID Publish Year Pages File Format Full-Text
47908 46485 2008 6 PDF Available
Title
The effect of different divalent cations on the reduction of hexavalent chromium by zerovalent iron
Abstract

The effects of ferrous cation (Fe2+), copper cation (Cu2+) and calcium cation (Ca2+) on the reduction of hexavalent chromium Cr(VI) by zerovalent iron (Fe0) were investigated. The pseudo-first-order kinetic model was used for describing the reduction of Cr(VI). The experimental results showed that Cu2+ and Fe2+ could improve the reduction of Cr(VI) but Ca2+ might inhibit the reduction of Cr(VI) by Fe0. The improvement of the reduction of Cr(VI) by Cu2+ on Fe0 might be ascribed to Cu2+ acting as a catalyst or the media of charge transfer during the reaction. Different concentration of Cu2+ might lead to the different reduction kinetics of Cr(VI) by Fe0. The X-ray diffraction (XRD) results showed that the reacted iron powder was coated by a small amount of β-FeOOH. The results of scanning electron microscope (SEM), energy dispersive X-ray spectrometer (EDS) and Fourier-transform infra-red (FTIR) showed that the Fe–Cr coprecipitate or Fe–Cr–Cu coprecipitate might be formed during the reaction.

Keywords
Chromium; Divalent cation; Zerovalent iron; Reduction
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The effect of different divalent cations on the reduction of hexavalent chromium by zerovalent iron
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 84, Issues 1–2, 25 October 2008, Pages 170–175
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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