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• W2193342281 abstract "Abstract Thioarsenates have been found to be major arsenic species in some sulfidic waters and their interactions with minerals play an important role in the geochemical cycling of arsenic. This work investigated the sorption behavior of monothioarsenate (mtAs V ) on amorphous aluminum hydroxide (am-Al(OH) 3 ) at various pHs and characterized the adsorbed arsenic by using X-ray absorption spectroscopy (XAS) and Fourier transform infrared spectroscopy (FTIR). The uptake of arsenic by am-Al(OH) 3 from mtAs V solution (86–16 mg·g − 1 ) was found to be much less than that from arsenate (As V ) solution (112–50.5 mg·g − 1 ) at all pHs applied (4–10). MtAs V was partly reduced to arsenite with concurrent production of elemental sulfur, and the interaction with am-Al(OH) 3 at acidic pH enhanced the reduction, which is attributed to acid-catalysis at the am-Al(OH) 3 surface. Transformation of mtAs V to arsenate also occurred during the adsorption process. The linear combination fitting (LCF) of As K-edge X-ray absorption near edge structure (XANES) spectra indicated that the arsenic adsorbed on am-Al(OH) 3 was present dominantly as mtAs V , with minor amounts as arsenite and arsenate. The As K-edge extended X-ray absorption fine structure (EXAFS) and FTIR results suggested that bidentate binuclear complexation was involved in the adsorption of mtAs V on am-Al(OH) 3 . This study is the first documentation of mtAs V sorption on aluminum hydroxides and is necessary to assess geochemical cycling of arsenic in sulfidic natural or mining-impacted environments." @default.
• W2193342281 created "2016-06-24" @default.
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• W2193342281 date "2015-06-01" @default.
• W2193342281 modified "2023-10-15" @default.
• W2193342281 title "Adsorption of monothioarsenate on amorphous aluminum hydroxide under anaerobic conditions" @default.
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• W2193342281 doi "https://doi.org/10.1016/j.chemgeo.2015.04.018" @default.
• W2193342281 hasPublicationYear "2015" @default.
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