Raman and IR spectra were recorded of the As-loaded Mn(3)O(4) magnetic composites obtained from the adsorption studies performed with As(III). XANES results for the composite after As(III) removal tests show that the As adsorbed is at the oxidized arsenic form, As(V). Monodentate and bidentate surface complexes are suggested for arsenic adsorption onto the composite (5-16 mg/g). Precipitation of manganese arsenate is observed for high As loading (35 mg/g).
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