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<p>This study investigated the adsorption behaviour of Sr<sup>2+</sup> by GMZ bentonite, considering the effects of time and initial concentration, and quantified the ion exchange contribution. Results showed that Sr<sup>2+</sup> adsorption reached equilibrium within 48&#xa0;h. As the initial Sr<sup>2+</sup> concentration increased, the adsorption capacity increased, whereas the adsorption rate declined. Meanwhile, the ion exchange adsorption capacity increased and reached a plateau at high concentrations, while the ion exchange adsorption ratio decreased from 95.7% to 68.8%. Sorption process is governed by ion exchange. As ion exchange sites saturate, multilayer adsorption occurs and surface or edge interactions become significant.</p>

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Role of ion exchange in the adsorption of Sr2+ by bentonite

  • 期刊论文

  • 发表日期：

    2025年8月5日

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  • Jingru Ji,
  • Weiyun Liang,
  • Rongtao Yan,
  • Jiaying Ji,
  • Qin Zhang

摘要

This study investigated the adsorption behaviour of Sr2+ by GMZ bentonite, considering the effects of time and initial concentration, and quantified the ion exchange contribution. Results showed that Sr2+ adsorption reached equilibrium within 48 h. As the initial Sr2+ concentration increased, the adsorption capacity increased, whereas the adsorption rate declined. Meanwhile, the ion exchange adsorption capacity increased and reached a plateau at high concentrations, while the ion exchange adsorption ratio decreased from 95.7% to 68.8%. Sorption process is governed by ion exchange. As ion exchange sites saturate, multilayer adsorption occurs and surface or edge interactions become significant.