Ion exchange of Cu²⁺, Ni²⁺, Pb²⁺ and Zn²⁺ in analcime (ANA) synthesized from Thai perlite

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• 作者：Tangkawanit ; Sudaporn ; Rangsriwatananon ; Kunwadee ; Dyer ; Alan
• 关键词：Ion exchange ; Perlite ; Analcime ; Heavy metals ; Selectivity ; Thermodynamic parameters
• 刊名：Microporous and Mesoporous Materials
• 出版年：2005
• 期刊代码：78_13871811
• 类别：ch
• 出版时间：April 1, 2005
• 卷：79
• 期：1-3
• 页码：171-175
• 文件大小：143 K

摘要

This work studied the ion exchange of Cu²⁺, Ni²⁺, Pb²⁺ and Zn²⁺ 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 Pb²⁺ > Cu²⁺ > Zn²⁺ > Ni²⁺, as indicated by values of ΔG⁰. The results demonstrated that the enthalpy of cation hydration determined the selectivity of the zeolite. ΔS⁰ 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.