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X-ray Photoelectron Studies of Anion Adsorption on Goethite¹

ABSTRACT

X-ray photoelectron spectroscopy (XPS) was evaluated as a technique to study anion adsorption on soil minerals; in this case, the well-characterized systems of phosphate, sulfate, and selenite adsorption on goethite (-FeOOH). X-ray photoelectron spectroscopy measured directly the surface coverage, the form of the adsorbed species and substrate, and the pH dependence of adsorption. The results confirm the previously reported adsorption mode in which two A-type hydroxyls are replaced by coordination of two of the oxygen atoms of the anion.

¹ Cooperative studies between Dep. of Chemistry, Univ. of Western Ontario, London, Ontario, Canada N6A 5B7, and School of Science, Griffith Univ., Nathan, Brisbane, Australia, 4111. Supported by a travel grant from UWO.

² Associate Professor, Dep. of Chemistry, Univ. of Western Ontario, and Associate Professor, School of Science, Griffith Univ., respectively.

Received for publication March 19, 1986.

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