IR SPECTROSCOPY OF SURFACE PHOSPHATE COMPLEXES ON (HYDRO) OXIDE PHASES OF IRON (REVIEW).

A review is given on the study of the nature of surface phosphate complexes on iron (hydr)oxide phases using IR spectroscopy. IR spectroscopy is very popular for studying surface phosphate complexes on various iron (hydr)oxides. This research method is “very sensitive” to the coordination environment and protonated states of phosphate complexes. The adsorption of phosphate ions on the surface of (hydr)iron oxides depends on pH. Protonation of surface inner-sphere complexes is assumed in almost all studies, especially in the case of complexes formed at low pH values. The nature of surface phosphate complexes on iron (hydr)oxides depends on the hydrogen phosphate and dihydrogen phosphate ions that interact with Fe (II) and Fe (III) ions on the surface.