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Development of kinetic and equilibrium models for removal of C d 2+ and Z n 2+ ions from aqueous solutions by clinoptilolite
Author(s) -
Irannajad Mehdi,
Kamran Haghighi Hossein,
Safarzadeh Eshagh
Publication year - 2016
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.12260
Subject(s) - clinoptilolite , sorption , aqueous solution , langmuir , chemistry , freundlich equation , adsorption , kinetic energy , ion , langmuir adsorption model , inorganic chemistry , nuclear chemistry , zeolite , analytical chemistry (journal) , chromatography , organic chemistry , physics , catalysis , quantum mechanics
The ability of clinoptilolite to remove Cd 2+ and Zn 2+ 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 Zn 2+ and Cd 2+ sorption were investigated. The results showed that the Zn 2+ and Cd 2+ 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 Zn 2+ and Cd 2+ ions could be best modeled by the Langmuir equation. The maximum capacity of Zn 2+ and Cd 2+ 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 Cd 2+ and Zn 2+ removal. © 2015 American Institute of Chemical Engineers Environ Prog, 35: 633–641, 2016