Ion Exchange Properties of Amorphous Zirconium Phosphate in Mixed Solvents

Abstract

Tracer equilibria measurements for sorption on zirconium phosphate (ZrP) of Na + in up to 90 % methanol and acetone and of Cs + in up to 90% methanol and 60% isopropanol and acetone have shown that in all these solutions, ion exchange is the main sorption mechanism. With the exception of the Na + capacity in 90% methanol, the Na + -and Cs + -capacities of ZrP, are higher in solutions containing up to 90% methanol, 60% isopropanol and 60% acetone than in water, which is probably due to the higher basicity of the mixed solvents and a possible dehydration of Na + and Cs + , particularly in solutions of relatively high organic solvent contents. The diffusion coefficient of Na + in ZrP decreases on addition of up to 90% methanol and acetone and the decrease is highest in the presence of 90% methanol.

Aspects of the Adsorption Behavior of Cu2+, Zn2+, and Ni2+Ions on Lithium Titanate Ion Exchanger

“…[13,14] In this regard, two different assumptions describe the nature of the adsorbed ions. [15] The last behavior was observed for adsorption of Cs þ and Na þ ions on amorphous [15] and for Cu 2þ , Zn 2þ , Co 2þ , Ni 2þ , and Mn 2þ ions on hydrous tin(IV) oxide. [13] The second is explained by the fact that the alkaline metal ions are retained by the exchanger as essentially hydrated (or solvated) ions and thus the affinity is higher for the smaller solvated ion (large ionic radii) for which more exchange sites are accessible.…”