The mechanism of diffusion of Cs+, Co2+, and Cd2+ ions in the H-form of tin-vanadate as cation exchanger was studied as a function of particle size, concentration of the exchanging ions, reaction temperature, and drying temperature. The exchange rate was controlled by a particle diffusion mechanism as a limited batch technique and is confirmed from straight lines of B versus 1/r2 plots. The values of diffusion coefficients, activation energy, and entropy of activation were calculated and their significance was discussed. The data obtained were compared with those reported for other inorganic ion exchangers.
Key words: Diffusion mechanism, cesium, cobalt, cadmium, tin vanadate, cation exchanger.
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