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<p>The global investigation of geological barriers is advancing for their use in nuclear waste management. Argillaceous clay-based repositories appear to be a suitable and viable option for the management of high-level nuclear waste (HLW). The retention behaviour of Cs(I) and Am(III) on Vindhyan argillaceous clay has been examined from this perspective. The characterization of Vindhyan argillaceous clay indicated that it mostly comprises illite (25%) and quartz (75%), with a cation exchange capacity (CEC) of 210&#xa0;meq&#xa0;kg<sup>−1</sup>, which is notably higher compared to other clays. The investigation of the influence of time, pH, ionic strength, radionuclide concentration, and temperature on the sorption of Cs(I) and Am(III) by Vindhyan argillaceous clay indicated that Cs(I) sorption occurs through ion exchange, whereas Am(III) sorption become apparent through both ion exchange and surface complexation. Thermodynamic parameters for the sorption reactions were derived from equilibrium constants determined by modelling the profiles of Cs(I) and Am(III). The sorption of Cs(I) was enthalpy-driven, whereas the sorption of Am(III) was entropy-driven.</p>

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Understanding of Cs(I) and Am(III) retention behaviour on Vindhyan argillaceous clay for evaluating its suitability for nuclear waste management

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  • 发表日期：

    2025年5月15日

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  • Aishwarya Soumitra Kar,
  • Priyanka Balan,
  • M. K. Das,
  • S. Jeyakumar,
  • R. K. Bajpai,
  • M. K. Saxena

摘要

The global investigation of geological barriers is advancing for their use in nuclear waste management. Argillaceous clay-based repositories appear to be a suitable and viable option for the management of high-level nuclear waste (HLW). The retention behaviour of Cs(I) and Am(III) on Vindhyan argillaceous clay has been examined from this perspective. The characterization of Vindhyan argillaceous clay indicated that it mostly comprises illite (25%) and quartz (75%), with a cation exchange capacity (CEC) of 210 meq kg−1, which is notably higher compared to other clays. The investigation of the influence of time, pH, ionic strength, radionuclide concentration, and temperature on the sorption of Cs(I) and Am(III) by Vindhyan argillaceous clay indicated that Cs(I) sorption occurs through ion exchange, whereas Am(III) sorption become apparent through both ion exchange and surface complexation. Thermodynamic parameters for the sorption reactions were derived from equilibrium constants determined by modelling the profiles of Cs(I) and Am(III). The sorption of Cs(I) was enthalpy-driven, whereas the sorption of Am(III) was entropy-driven.