Abstract
This work studied the ion exchange of Cu 2+, Ni 2+, Pb 2+ and Zn 2+ into an analcime (ANA) in the temperature range 298–333 K. The analcime was produced from an economically available Thai perlite. The selectivity sequence for ions entering analcime in its as-synthesized sodium form was Pb 2+ > Cu 2+ > Zn 2+ > Ni 2+, as indicated by values of Δ G 0. The results demonstrated that the enthalpy of cation hydration determined the selectivity of the zeolite. Δ S 0 values were related to changes in water content. A comparison of the selectivity series for Pb, Cu, Ni, and Zn cation uptake into analcime to those of other zeolites shows similar trends.
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