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Evaluation of the possible use of a Bulgarian clinoptilolite for removing strontium from water media

Published online by Cambridge University Press:  02 January 2018

N. Lihareva ,
O. Petrov ,
Y. Tzvetanova ,
M. Kadiyski  and
V.A. Nikashina
N. Lihareva
Affiliation:
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, 1113 Sofia, Bulgaria
O. Petrov*
Affiliation:
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, 1113 Sofia, Bulgaria
Y. Tzvetanova
Affiliation:
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, 1113 Sofia, Bulgaria
M. Kadiyski
Affiliation:
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, 1113 Sofia, Bulgaria
V.A. Nikashina
Affiliation:
Vernadsky Institute of Geochemistry and Analytical Chemistry RAS, Moscow, Russia
*
*E-mail: opetrov@dir.bg
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Abstract

The sorption of Sr2+ ions by natural clinoptilolite was investigated using the batch method. The effects of pH, contact time and strontium concentrations were tested and the optimal conditions for sorption were determined. The process was very fast initially and equilibrium was reached within 24 h. Kinetic sorption data were fitted to pseudo-first-order, pseudo-second-order and intra-particle diffusion models. The simple pseudo-second-order rate model provides good agreement with the experimental data for Sr2+ uptake. The respective rate constants, k2, calculated at different initial Sr2+ concentrations, were obtained. The equilibrium data were analysed by applying the Langmuir, Freundlich and Dubinin–Raduchkevich isotherm models. The Langmuir model describes the observed Sr2+ uptake most accurately and the value of the monolayer sorption capacity is 32.81 mg Sr2+/g. The effect of Na+ ions and the effectiveness of uptake from low saline groundwater simulated solutions were also studied and discussed.

Keywords

clinoptiloliteSr2+ uptakeion exchangekineticsequilibrium
Type
Research Article
Information
Clay Minerals , Volume 50 , Issue 1 , March 2015 , pp. 55 - 64
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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