Enhanced oxidative and adsorptive removal of arsenite by the heterogeneous interfacial reaction of sulfidated nanoscale zerovalent iron

After sulfidation, sulfur is doped into the iron core, endowing S-nZVI with lower corrosion, stronger adsorption and interfacial oxidation of As( iii ). Arsenic atoms diffuse the inner area and form arsenic sulfide stabilizing in the S-nZVI core.