Abstract
Layered γ-titanium phosphate (γ-TiP), Ti (HPO4) 2⋅2H2O, is well known as the host material of intercalation compounds and the inorganic ion-exchanger of H+/metal ion system. It was found to have high ion-exchange selectivity for Rb+ and Cs+ among alkali metal ions. The ionexchange reactions for these ions progressed in two steps according to pH. Part of water molecules in the mterlayer of γ-TiP was taken away during ion-exchange reaction and an amorphous γ-TiP resulted. This phenomenon was first studied by thermal analysis and further investigation was carried out using solid NMR of 1H and 133Cs in detail. Moreover, the interaction between Fe2+ and Cs+ for the ion-exchange reaction was investigated. Despite Fe2+ was hard to adsorb to γ-TiP, the amount of sorbed Fe2+ increased when Cs+ coexisted and the amount of sorbed Cs+ decreased.
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