Reactions of metal ions at surfaces of hydrous iron oxide

摘要: Abstract Cu, Ag and Cr concentrations in natural water may be lowered by mild chemical reduction involving ferric hydroxide-ferrous ion redox processes. V Mo solubilities controlled precipitation of ferrous vanadate or molybdate. Concentrations as low 10−8.00 10−9.00 M are readily attainable for all these metals oxygen-depleted systems that relatively rich Fe. Deposition manganese oxides such Mn3O4 can catalyzed oxygenated coupling to ferrous-ferric reactions. Once formed, disproportionate, giving Mn4+ oxides. This reaction produces strongly oxidizing conditions at oxide surfaces. The solubility As is significantly influenced iron only pH. Spinel structures chromite ferrites Ni, Zn, very stable if locally developed on hydroxide surfaces could bring about much below divalent near neutral Solubilities calculated from thermodynamic data shown graphically compared with observed some systems.