The redox transformations of arsenite (As(III)) and chromate (Cr(VI)) on iron and manganese oxide in the dark and in the presence of light will be presented. On iron oxides, which include ferrihydrite and goethite, the coadsorption of As(III) and Cr(VI) results in redox chemistry resulting in the formation of arsenate, As(V), and Cr(III). This reaction occurs with faster kinetics in the presence of light. Mechanistic details of this redox chemistry will be presented. Also presented will be research that investigated the redox chemistry of As(III) on the manganese oxide, birnessite, in the dark and in the presence of light. The kinetics of the redox transformation of As(III) to As(V) in the presence of birnessite is shown to increase in the presence of light. Experiments also were conducted to determine the possible contribution of reactive oxygen species on this redox chemistry.

Redox chemistry of As(III) and Cr(VI) on iron and manganese oxide

254th National Meeting (2017)

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