Multicomponent ion exchange on zeolite 4A

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2011

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Kadaifci, Bijen

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In this study binary and ternary ion exchange on Zeolite NaA using silver and cadmium ions were investigated. Ion exchange were conducted at constant temperature (25oC) and normality (0.1N) in a batch system for both binary and ternary experiments. Zeolite weights were varied between 0.1 and 1 g for binary experiments. Thermodynamic analysis of binary ion exchange between Cd2+-Na+ and Ag+-Na+ were examined and thermodynamic equilibrium constant and Gibbs free energy were calculated. Thermodynamic equilibrium constants were found as respectively 28.2 and 300.4 for Cd2+-Na+ and Ag+-Na+ binary system. Standart free energy of Cd2+-Na+ and Ag+-Na+ binary exchange were calculated as -4.1 kJ/mol and -14.1 kJ/mol respectively. In literature Ay (2008) calculated the Gibbs free energy for Ag+-Na+ binary system as -14.4 kJ/mol and Biskup and Subotic (2010) and Gal et al. (1970) calculated the Gibbs free energy for Cd2+-Na+ binary system as -3.7 kJ/mol and -4.4 kJ/mol respectively. It is concluded Zeolite 4A has higher affinity to silver than cadmium and selectivity sequence was found as; Ag+>Cd2+>Na+. Langmuir and Freundlich isotherms were drawn to describe experimental data. As compared the R2 of isotherms, it is clearly seen that Freundlich isotherm provides better fit for Cd2+-Na+ binary ion exchange and Ag+-Na+ binary ion exchange. The ternary ion exchange isotherms were plotted using equivalent fraction of three ions (Ag+,Na+,Cd2+) which participated in ion exchange experiments to determine selectivity of zeolite 4A for cadmium and silver. Selectivity sequence was determined as Ag+ > Cd2+ >Na+ for ternary ion exchange.

Subject Keywords

Ion exchange.

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http://etd.lib.metu.edu.tr/upload/12613916/index.pdf
https://hdl.handle.net/11511/20822

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

B. Kadaifci, “Multicomponent ion exchange on zeolite 4A,” M.S. - Master of Science, Middle East Technical University, 2011.