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Geochemical and thermodynamic aspects of sorption of strontium on kaolinite dominated clay samples at Kalpakkam

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Abstract

The mobility of strontium in subsurface is largely influenced by sorption on to clay minerals. In the present study, kaolinite clay samples collected from the Kalpakkam nuclear plant site were employed to understand the sorption characteristics of strontium by batch method. The effect of several parameters such as time, strontium ion concentration, pH, temperature and ionic strength was investigated. The kinetic studies suggested pseudo-second-order mechanism. The experimental sorption data was fitted to Langmuir adsorption model for obtaining the sorption capacity of the sorbent. The maximum sorption capacity was 5.77 mg/g at 298 K and was found to increase with an increase in temperature. It was observed that the distribution coefficient (K d) of strontium on clay increased as the pH of the solution increased. The distribution coefficient was found to decrease with an increase in concentration of Na+ and Ca2+ ions. This variation of K d suggests that cation exchange is the predominant sorption process. It was also observed that sorption process is endothermic. The thermodynamic parameters such as ∆G 0, ∆H 0 and ∆S 0 were calculated. The negative values obtained for ∆G 0 indicated that the sorption of strontium on clay was spontaneous at all studied concentrations. ∆G 0 becomes more negative with an increase in temperature, suggests that the sorption process is more favorable at higher temperatures.

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Acknowledgments

One of the authors, Ms. Deepthi Rani, gratefully acknowledges the research fellowship extended by Atomic Energy Regulatory Board (AERB), Government of India, Niyamak Bhavan, Mumbai, to pursue the present investigations. The authors gratefully acknowledge the help rendered by Chemistry Group of Indira Gandhi Centre for Atomic Research (IGCAR) for analysis using Atomic Absorption Spectroscopy.

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  1. Safety Research Institute, Atomic Energy Regulatory Board, Kalpakkam, 603102, India

    R. Deepthi Rani & P. Sasidhar

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  1. R. Deepthi Rani
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  2. P. Sasidhar
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Correspondence to P. Sasidhar.

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Deepthi Rani, R., Sasidhar, P. Geochemical and thermodynamic aspects of sorption of strontium on kaolinite dominated clay samples at Kalpakkam. Environ Earth Sci 65, 1265–1274 (2012). https://doi.org/10.1007/s12665-011-1374-4

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  • DOI: https://doi.org/10.1007/s12665-011-1374-4

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