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The Mechanism of Sulfate Adsorption on Iron Oxides¹

ABSTRACT

Adsorption isotherms were determined for sulfate adsorption on iron oxides under acid conditions. The product of the surface reaction between the iron oxides and sulfate ions was examined by infrared spectroscopy which showed four bands in the v S-O stretching region. Thus a structural model could be obtained for the reaction. Two surface hydroxyl groups (or OH₂⁺ ions) are replaced by one sulfate ion, and two oxygen atoms of the sulfate ion are coordinated each to a different Fe³⁺ ion, resulting in the binuclear bridging surface complex Fe-O-S(O₂)-O-Fe. The complex is formed on the surfaces of goethite (-FeOOH), akaganéite (ß-FeOOH), lepidocrocite (-FeOOH), hematite (-Fe₂O₃) and amorphous ferric hydroxide.

¹ Contribution from Agric. and Chem. Dep., Univ. of Papua New Guinea.

² Formerly Senior Lecturer in Soil Science. Present address: Soil Bureau, D.S.I.R., Lower Hutt, New Zealand.

³ Senior Lecturer in Chemistry. School of Science, Griffith Univ., Nathan. 4111, Queensland, Australia.

Received for publication April 18, 1977. Accepted for publication August 29, 1977.

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