Ion exchange properties of tin(IV) materials—IV: Crystalline tin(IV) phosphate

Abstract

The preparation is described of a crystalline tin(IV) phosphate ion exchanger, which exhibits a better base stability than amorphous tin(IV) phosphate gel. On the basis of analytical, ion-exchange and thermal analysis data the formula Sn(HPO 4) 2· nH 2O has been assigned to the crystalline material, whose cation-exchange capacity (5·6–6·0 m-equiv. g −1) is equal to the theoretical required for complete displacement of the acid phosphate hydrogen. The exchanger, which is monofunctional, can be fully converted to the Li +, Na + and K + forms, but Cs + is only partially sorbed. X-ray data for the H + form and alkali metal forms of the exchanger are presented and discussed.