Development of kinetic and equilibrium models for removal of Cd2+ and Zn2+ ions from aqueous solutions by clinoptilolite

The ability of clinoptilolite to remove Cd2+ and Zn2+ from aqueous solution was studied. In this regard, the effects of important parameters such as initial concentration, initial pH, chemical conditioning, environmental temperature, and contact time on the Zn2+ and Cd2+ sorption were investigated. The results showed that the Zn2+ and Cd2+ sorption behavior was highly dependent on the pH. Sorption data were interpreted in terms of Langmuir and Freundlich equations. As a result, sorption isotherms of Zn2+ and Cd2+ ions could be best modeled by the Langmuir equation. The maximum capacity of Zn2+ and Cd2+ using modified clinoptilolite was found to be 229 and 72.30 mg/g. Furthermore, kinetic investigations showed that the adsorption rate was best described by a pseudo‐second‐order kinetic model. With respect to the results, clinoptilolite has a particularly high potential for Cd2+ and Zn2+ removal. © 2015 American Institute of Chemical Engineers Environ Prog, 35: 633–641, 2016

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