A comparative study of the uptake of the cations, Cu~(2+), Ni~(2+), Co~(2+) and Ca~(2+) by hydrous titanium oxides unheated and heat-treated at 400°C was carried out. The hydrous oxides were prepared at different pH values, using titanous chloride as starting material and hydrogen peroxide as oxidizing agent. Similarly to the unheated oxides, the heat-treated samples were found to be amphoteric in nature and exhibited an isolelectric point of ～6.6. The total ion exchange capacity was found to generally decrease with heat treatment, so did the selectivity to a number of cations. Characterization of the samples by infrared and nitrogen adsorption studies were also carried out.
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