Raman and IR spectroscopic investigation of As adsorbed on Mn_3O_4 magnetic composites

摘要

Raman and IR spectra were recorded of the As-loaded Mn3O4 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).