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The sorption equilibria in natural zeolite - aqueous solutions systems

Equilibrium properties of the hydrolysis and ion exchange process have been examined in natural and pre-treated zeolite-clinoptilolite by measuring the concentration of exchangeable Na^+, K^+, Ca^2+ and Mg^2+ ions with time in the liquid phase. The analysis of the relation of concentrations of ionic species leaving the zeolite and those entering the zeolite structure (H^+, Zn^2+) has found this process to be a non-stoichiometric one.The established non-stoichiometry of the overall mass transfer process through the outer and inner surface of zeolite particles is due to the strength of the bond of exchangeable ions in the structure, as a phenomenon of sorption. The sorption takes place on characteristic locations on the zeolite particle surface, which has been confirmed by SEM images and EDX analysis.

natural zeolite; sorption; Zn-ions

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