Calcium Sulfite Solids Activated by Iron for Enhancing As(III) Oxidation in Water |
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| Authors: | Minjuan Cai Sen Quan Jinjun Li Feng Wu Gilles Mailhot |
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| Institution: | 1.Hubei Key Lab of Biomass Resource Chemistry and Environmental Biotechnology, School of Resources and Environmental Science, Wuhan University, Wuhan 430079, China; (M.C.); (J.L.); (F.W.);2.Hubei Academy of Environmental Science, Wuhan 430072, China;3.CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand, Université Clermont Auvergne, F-63000 Clermont–Ferrand, France; |
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| Abstract: | Desulfurized gypsum (DG) as a soil modifier imparts it with bulk solid sulfite. The Fe(III)–sulfite process in the liquid phase has shown great potential for the rapid removal of As(III), but the performance and mechanism of this process using DG as a sulfite source in aqueous solution remains unclear. In this work, employing solid CaSO3 as a source of SO32−, we have studied the effects of different conditions (e.g., pH, Fe dosage, sulfite dosage) on As(III) oxidation in the Fe(III)–CaSO3 system. The results show that 72.1% of As(III) was removed from solution by centrifugal treatment for 60 min at near-neutral pH. Quenching experiments have indicated that oxidation efficiencies of As(III) are due at 67.5% to HO•, 17.5% to SO5•− and 15% to SO4•−. This finding may have promising implications in developing a new cost-effective technology for the treatment of arsenic-containing water using DG. |
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| Keywords: | desulfurized gypsum Fe(III) CaSO3 As(III) resource utilization |
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