Synthetic inorganic ion-exchange materials—XVIII: Ion-exchange equilibria of crystalline antimonic(V) acid with alkali metal ions

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Abstract

Exchange isotherms for hydrogen ion/alkali metal ions have been measured at 20 and 40°C, with a solution ionic strength of 0.1, in crystalline antimonic(V) acid as a cation-exchanger. The isotherms showed S-shaped curves for the systems of H+Na+, H+K+, H+Rb+ and H+Cs+, but not for H+Li+ exchange. The selectivity coefficients (logarithm scale) vs equivalent fraction (XM+) of alkali metal ions in the exchanger give linear functions for all systems studied. The selectivity sequences as a function of XM+ decrease in the order; Na+>Rb+>Cs+>K+ for 0.0 – 0.1 of XM+, Na+>Rb+>K+>Cs+ for 0.1 – 0.32 and Na+>K+>Rb+>Cs+ for 0.32 – 1.0. Overall and hypothetical (zero loading) thermodynamic equilibrium constants were evaluated for these ion-exchange reactions.

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