Abstract
The ion-exchange properties of the titanium silicate, M 2Ti 2O 3SiO 4· nH 2O (M=H,Na), towards alkali ions has been examined. Potentiometric titration of the highly crystalline phase in the proton form, H 2Ti 2O 3(SiO 4)·1.6H 2O, showed a dependency of the exchange on the size and charge of the ion and the pH of the solution. It was found that the accessability of three different ion-exchange sites in the titanium silicate framework controls the uptake of ions: 100% of the total amount of the ion-exchange sites could be occupied at pH 12.5 by sodium and lithium ions, about 75% by potassium and rubidium ions and only 25% by cesium ion. The ion-exchange isotherms of alkali metal ions were determined and the corrected selectivity coefficients as a function of metal loading were analyzed. Sodium titanium silicate exhibits a high affinity for heavy alkali metals with the selectivity order Cs +>Rb +>K +. By studying the cesium and strontium uptake in the presence of NaNO 3, CaCl 2, NaOH, NaOH+KOH, and HNO 3 (in the range of 0.01–6 M) the titanium silicate was found to be an efficient Cs + ion exchanger in acid, neutral and alkaline media, which makes it promising for treatment of different types of nuclear waste and contaminated environmental and biological liquors.
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