Abstract
The Nernst−Planck equations are applied to study the ion-exchange kinetics on the surface of zirconium(IV) aluminophosphate for Li+/H+, Na+/H+, K+/H+, Mg2+/H+, Ca2+/H+, and Sr2+/H+ exchanges in the forward and reverse directions under the conditions favoring particle diffusion. On the basis of these studies, various physical parameters such as the self-diffusion coefficient (D0), the energy of activation (Ea), and the entropy of activation (ΔS*) have been determined and a correlation has been made of these parameters with the ion-exchange characteristics of the material. The study gives an insight into the ion-exchange processes going on in the exchanger phase and its potential use in metal ion separations.
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