Abstract

The H +/Sr 2+ ion-exchange in γ-Ti(HPO 4) 2 · 2H 2O was studied. Exchange isotherms and pH curves were obtained at 298.15, 313.15 and 328.15(± 0.1) K. The half-exchanged phase TiHSr 0.5(PO 4) 2 · 3H 2O (interlayer distance 1.34 nm) was detected. The equilibrium constants and the standard molar Gibbs free energy, enthalpy and entropy of the exchange reaction were determined.

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