On the mechanism of ion exchange in zirconium phosphates—XXIV Exchange of alkali metal ions on γ-zirconium phosphate
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γ-Zirconium phosphate, Zr(HPO4)2·2H2O, was found to vary in water content from about 1-3 moles without change in its interlayer spacing. Two types of ion exchange behavior were found with alkali metal cations. Lithium ion formed a two phase system up to about 25% of exchange. Then, a single exchanged phase existed to half exchange where the first endpoint occured. A single Li+ phase was also observed at higher loadings. With K+, Rb+ and probably Cs+ a single phase was obtained from very low loads to 50% uptake. The water content of these phases was low (∼ 1 mole) and their interlayer spacings less than that of the original γ-zirconium phosphate. Above 50% loading the water contents and interlayer spacings increased. Sodium ion exhibited features common to both types of behavior. Li+ and Na+ yielded reversible titration curves (exchange behavior) but K+ and Rb+ did not. © 1979.
author list (cited authors)
Clearfield, A., & Garces, J. M.