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

文献类型： 外文期刊

作者： Hou, Meifang 1 ; Wan, Hongfu 1 ; Liu, Tinglin 1 ; Fan, Yanning 1 ; Liu, Xinming 1 ; Wang, Xugang 1 ;

作者机构： 1.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Guangdong, Peoples R China

关键词： Chromium;Divalent cation;Zerovalent iron;Reduction

期刊名称：APPLIED CATALYSIS B-ENVIRONMENTAL （ 影响因子：19.503； 五年影响因子：17.291 ）

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收录情况： SCI

摘要： The effects of ferrous cation (Fe~(2+)), copper cation (Cu~(2+)) and calcium cation (Ca~(2+)) on the reduction of hexavalent chromium Cr(VI) by zerovalent iron (Fe~0) were investigated. The pseudo-first-order kinetic model was used for describing the reduction of Cr(VI). The experimental results showed that Cu~(2+) and Fe could improve the reduction of Cr(VI) but Ca~(2+) might inhibit the reduction of Cr(VI) by Fe~0 The improvement of the reduction of Cr(VI) by Cu~(2+) on Fe~0 might be ascribed to Cu~(2+) acting as a catalyst or the media of charge transfer during the reaction. Different concentration of Cu~(2+) might lead to the different reduction kinetics of Cr(VI) by Fe~0. 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.

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