Binary adsorption of nickel and zinc from aqueous solutions onto the Serbian natural clinoptilolite

Sorption of the Zn2+ and Ni2+ ions by the Na+-enriched natural clinoptilolite (Na-CLI) from aqueous solutions containing both Zn2+ and Ni2+ ions at a range of concentrations has been studied at 298, 308, and 318 K. It was found that the sorption of a particular ion by Na-CLI increases with the incre...

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Bibliographic Details
Published in:Desalination and water treatment 2016-08, Vol.57 (40), p.18748-18754
Main Authors: Stojakovic, Djordje, Milenkovic, Jelena, Stupar, Stevan, Velickovic, Zlate, Rajic, Nevenka
Format: Article
Language:English
Subjects:
Adsorption
Aqueous solutions
Binary
Clinoptilolite
Entropy
Exothermic reactions
Heavy metal
Ions
Kinetics
Mathematical models
Nickel
Rate constants
Sorption
Zeolite
Zinc
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Summary:Sorption of the Zn2+ and Ni2+ ions by the Na+-enriched natural clinoptilolite (Na-CLI) from aqueous solutions containing both Zn2+ and Ni2+ ions at a range of concentrations has been studied at 298, 308, and 318 K. It was found that the sorption of a particular ion by Na-CLI increases with the increase in the initial concentration of the solution of that ion. At a given initial concentration, the sorption degree increases with temperature. Also, the sorption of a particular ion is greater when the initial solution contains a second ion than it is when the particular ion is present alone. The sorption kinetics is in accord with the pseudo-second-order reaction rate model. The values of the k2 rate constant do not show a regular change with the initial Zn2+/Ni2+ concentrations probably because the presence of the second ion has a significant effect on the reaction rate. Thermodynamic study has shown that the sorption is exothermic, occurring spontaneously in the 298–318 K range and with a positive entropy change.
ISSN:1944-3986
1944-3994
1944-3986
DOI:10.1080/19443994.2015.1094426