Original scientific paper
Thermodynamics and Adsorption Isotherms of Copper Ions Removal from Solutions Using Synthetic Zeolite X
S. Svilović
orcid.org/0000-0003-0300-8932
; Department of Chemical Engineering Faculty of Chemistry and Technology, University of Split, Teslina 10/V, 21000 Split, Croatia
D. Rušić
; Department of Chemical Engineering Faculty of Chemistry and Technology, University of Split, Teslina 10/V, 21000 Split, Croatia
R. Žanetić
; Department of Chemical Engineering Faculty of Chemistry and Technology, University of Split, Teslina 10/V, 21000 Split, Croatia
Abstract
The sorptive removal of copper ions from aqueous solutions using zeolite X has been studied by a batch technique. The impact of solute concentration and temperature on the process of sorption were examined. Using obtained experimental values thermodynamic parameters such as: G0, H0 and S0 were calculated.
Langmuir, Freundlich, Dubinin-Radushkevich and Sips isotherms were fitted to experimental data, and their goodness-of-fit were compared.
The isotherms that take into account some sort of heterogeneity were found to give a better fit to experimental data than Langmuir. An apparent free energy, calculated using Dubinin-Radushkevich isotherm, showed ion-exchange type of spontaneous and endothermic sorption.
The results indicated that synthetic zeolite X can be used as an efficient ion-exchange material for the removal of copper ions from wastewaters.
Keywords
zeolite X; copper; isotherms; thermodynamics
Hrčak ID:
26761
URI
Publication date:
25.9.2008.
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