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Kinetics and mechanisms of amorphous FeS2 induced Cr(VI) reduction
Yunyi Li1, Jialiang Liang1, Xiao He1
1College of Environmental Sciences and Engineering, Peking University, Beijing Key Laboratory for Solid Waste Utilization and Management, 100871, PR China.
Abstract:
A novel reductant, amorphous FeS2 (FeS2(am)) was synthesized to remove hexavalent chromium (Cr(VI)). The stoichiometry, kinetics and mechanisms of FeS2(am) induced Cr(VI) reduction were studied under anaerobic conditions with a pH range of 5.0-13.0. Results showed that FeS2(am) was efficient in removing aqueous Cr(VI) with a stoichiometry of Cr(VI): FeS2(am) ∼1: 0.9. Moreover, the reduction kinetics decreased with the growth of pH within the pH range from 5.0 to 10.0, but increased within pH 10.0-13.0. The dissolution kinetics of FeS2(am) was found to be mainly responsible for the varied Cr(VI) reduction kinetics, and the mechanisms involved in the reduction process were further confirmed by X-ray photoelectron spectroscopy analysis. In addition, O2 was found to compete with Cr(VI) in the reduction process and subsequently impede the Cr(VI) reduction rate.
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