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<p>This study evaluated the potential of&#xa0;kaolin as a natural barrier in underground radioactive waste disposal systems. Laboratory tests assessed its chemical and physical properties, including a low swelling ratio of 1.5%, supporting its use as a low-permeability material. Kaolin effectively retained cobalt and cesium ions from aqueous solutions, with sorption influenced by the studied environmental factors. The process was diffusion-controlled, endothermic, and followed Langmuir isotherm, and fractal-like mixed-order model. Kaolin performed best under mildly acidic or alkaline conditions. Column and modeling studies (Brigham and plume models) confirmed the ability of&#xa0;kaolin to impede ions transport, supporting its environmental safety potential under saturated conditions.</p>

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Confinement of cobalt and cesium ions onto kaolin as a natural clay barrier under static and dynamic conditions

  • 期刊论文

  • 发表日期：

    2025年7月3日

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  • O. A. Abdel Moamen,
  • Lamis A. Attia,
  • H. S. Hassan

摘要

This study evaluated the potential of kaolin as a natural barrier in underground radioactive waste disposal systems. Laboratory tests assessed its chemical and physical properties, including a low swelling ratio of 1.5%, supporting its use as a low-permeability material. Kaolin effectively retained cobalt and cesium ions from aqueous solutions, with sorption influenced by the studied environmental factors. The process was diffusion-controlled, endothermic, and followed Langmuir isotherm, and fractal-like mixed-order model. Kaolin performed best under mildly acidic or alkaline conditions. Column and modeling studies (Brigham and plume models) confirmed the ability of kaolin to impede ions transport, supporting its environmental safety potential under saturated conditions.