Cesium exchange, selectivity, and fixation properties of γ-titanium phosphate

Layered γ-titanium phosphate exhibits selective Cs/sup +/ exchange with H/sup +/ and is superior to α-titanium phosphate in this respect. However, γ-titanium phosphate is much less selective for cesium than γ-zirconium phosphate. As an example, the cesium adsorption Kαs of γ-titanium phosphate, α-titanium phosphate, and γ-zirconium phosphate are 2560, 340, and 15130, respectively, from a 0.04N NaNO/sub 3/ solution. The total cesium-exchange capacity of the γ-titanium phosphate was determined by an adsorption isotherm to be 1.6 meq/g at the solution pH exchange. The exchanged cesium can be easily fixed in the interlayers of γ-titanium phosphate by its complete dehydration at only 1000C. The γ-titanium phosphate may be useful for Cs exchange in an ion-exchange process such as the Sandia titanate process for partitioning high-level commercial wastes