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• W2991154075 abstract "Calcium polysulfide (CPS) has been widely used for the remediation of hexavalent chromium (Cr(VI))-contaminated environments; however, the roles of natural iron oxides during the process of Cr(VI) sequestration are not well understood. In this study, we investigated the impact of natural iron oxides on the remediation of environments containing Cr(VI) using CPS and the mechanisms underlying such effects. Goethite and hematite markedly accelerated Cr(VI) sequestration by CPS, while Cr(VI) removal efficiency and apparent rate constant were increased at pH 7.0. Goethite increased the Cr(VI) removal efficiency of CPS from 80.6% to 98.6% at pH 7.0, while the apparent rate constant increased from 0.0074 to 0.028 L mol−1 min−1. Similarly, hematite increased the Cr(VI) removal efficiency of CPS to 98.4%, while the apparent rate constant increased to 0.024 L mol−1 min−1. pH had a negligible impact on the efficiency of Cr(VI) uptake by CPS with goethite or hematite under acidic conditions, whereas a pronounced effect on Cr(VI) removal efficiency was shown under basic conditions. Moreover, pH could significantly influence processes of promoted Cr(VI) sequestration using CPS with goethite or hematite. At acidic pH, increased Cr(VI) uptake was attributed mainly to the adsorption of Cr(VI) on goethite and hematite, which was accompanied by minor Cr(VI) reduction by electrons from the surface channel of >Fe(III)-O-Fe(II) ↔ >Fe(II)-O-Fe(III) and Fe(II) from CPS-reacted goethite and hematite. At neutral and basic pH, polysulfide-activated Fe(III) on the surface of goethite and hematite acted as a bridge between CPS and Cr(VI), which accelerated electron shuttling from polysulfides to Cr(VI), while Cr(VI) reduction was enhanced by the reactions of Cr(VI) with FeS2 and compounds containing Fe(II)-S bonds. Our study demonstrates that natural iron minerals can enhance Cr(VI) sequestration using CPS during the remediation of Cr(VI)-contaminated environments rich in iron oxides." @default.
• W2991154075 created "2019-12-05" @default.
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• W2991154075 date "2020-04-01" @default.
• W2991154075 modified "2023-09-29" @default.
• W2991154075 title "Roles of natural iron oxides in the promoted sequestration of chromate using calcium polysulfide: pH effect and mechanisms" @default.
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• W2991154075 doi "https://doi.org/10.1016/j.seppur.2019.116350" @default.
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