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Sorption of strontium on Slovak bentonites

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Abstract

Sorption of Sr on five Slovak bentonites of deposits has been studied with the use of batch technique. In the experiments there have been used natural, chemically modified and irradiated samples, in three different kinds of grain size. The pH influence on sorption of strontium on bentonites, pH change after sorption and influence of competitive ions have been studied. Distribution ratios have been determined for bentonite–strontium solution system as a function of contact time, pH and sorbate concentration. The data have been interpreted in term of Langmuir isotherm. The uptake of Sr has been rapid and the sorption of strontium has increased by increasing pH. The percentage sorption has decreased with increasing metal concentrations. The pH value after sorption for the natrificated forms of bentonite starts already in the alkaline area and moves to the higher values. For the natural bentonites the values occur in the neutral or in the acidic area. Sorption of Sr has been suppressed by presence of competitive cations as follows: Ba2+ > Ca2+ > Mg2+ > NH4 + > K+ > Na+. By sorption on natrificated samples colloidal particles and pH value increase have been formed. The bentonite exposure as a result of interaction of γ-rays has led to expansion of the specific surface, increasing of the sorption capacity and to the change in the solubility of the clay materials.

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Acknowledgments

This work has been supported by Task of research and development no. 2003 SP/26 028 0C 00/028 0C 02. Authors are grateful to Mgr. P. Babic, MA for his help with translation of this paper.

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Authors and Affiliations

  1. Department of Nuclear Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská Dolina, 851 01, Bratislava, Slovak Republic

    M. Galamboš, J. Kufčáková & P. Rajec

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  1. M. Galamboš
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  2. J. Kufčáková
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  3. P. Rajec
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Galamboš, M., Kufčáková, J. & Rajec, P. Sorption of strontium on Slovak bentonites. J Radioanal Nucl Chem 281, 347–357 (2009). https://doi.org/10.1007/s10967-009-0017-7

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