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Abiotic As (III) oxidation by hydrated Fe (III) oxide (HFO) microparticles in a plug flow columnar configuration

Abstract:

Scientific evidence pertaining to selective sorption of As(V) species or arsenates and As(III) species or arsenites onto Fe(III) oxide microparticles is widely available in the literature. Practical implications of this phenomenon are well recognized for both natural and engineered systems. The previous investigations to this effect have clearly established that such selective sorption processes are accompanied by formation of inner-sphere complexes between the surface functional groups of Fe(III) oxides and As(V) or As(III) species in question. Although thermodynamically favorable, oxidation of As(III) or arsenite by Fe(III) oxides has not been reported to date. Experimental studies for all such investigations were, however, carried out in continuously stirred batch reactors. The results of the present study confirm that, in a plug flow configuration with stationary Fe(III) oxide microparticles in a column, aqueous-phase As(III …