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Influence of contact time, pH, soil humic/fulvic acids, ionic strength and temperature on sorption of U(VI) onto MX-80 bentonite

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Abstract

The sorption of U(VI) from aqueous solution on MX-80 bentonite was studied as a function of contact time, pH, ionic strength, solid contents, humic acid (HA), fulvic acid (FA) and temperature under ambient conditions using batch technique. The results indicate that sorption of U(VI) on MX-80 bentonite is strongly dependent on pH and ionic strength. The removal of U(VI) to MX-80 bentonite is rather quick and the kinetic sorption data is simulated well by a pseudo-second-order rate equation. The presence of HA enhances the sorption of U(VI) on MX-80 bentonite obviously, but the influence of FA on U(VI) sorption is not obvious. The thermodynamic parameters (ΔH 0, ΔS 0, and ΔG 0) for the sorption of U(VI) calculated from temperature dependent sorption suggest that the sorption reaction is endothermic and spontaneous.

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Acknowledgments

Financial supports from National Natural Science Foundation of China (20677058; 20501019) and Special Foundation for High-level Waste Disposal (2007-840) are gratefully acknowledged.

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Correspondence to Jiaxing Li.

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Ren, X., Wang, S., Yang, S. et al. Influence of contact time, pH, soil humic/fulvic acids, ionic strength and temperature on sorption of U(VI) onto MX-80 bentonite. J Radioanal Nucl Chem 283, 253–259 (2010). https://doi.org/10.1007/s10967-009-0323-0

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  • DOI: https://doi.org/10.1007/s10967-009-0323-0

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