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<p>CO<sub>2</sub> may erode cement structure of geological disposal repository in the long-term disposal process. This study investigates the adsorption behavior and mechanism of carbonated cement for Co<sup>2+</sup> via characterization and adsorption experiments. Characterization experiments show that the carbonation does not change the adsorption mechanism of cement for Co<sup>2+</sup>. Adsorption experiments show that carbonation reduces the adsorption capacity of cement. In general, the adsorption of Co<sup>2+</sup> by both pristine and carbonated cement involves multiple mechanisms including ion exchange and chemical adsorption. This study provides critical data for safety assessments of the geological disposal repository.</p>

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Adsorption mechanism of carbonated cement in geological disposal environments for cobalt

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Hui Tang,
  • Qiao Jiang,
  • Songlin Zhu,
  • Qiang Yang,
  • Hong Gu,
  • Pei Liu,
  • Tao Hong,
  • Zehua Li,
  • Yangchun Leng

摘要

CO2 may erode cement structure of geological disposal repository in the long-term disposal process. This study investigates the adsorption behavior and mechanism of carbonated cement for Co2+ via characterization and adsorption experiments. Characterization experiments show that the carbonation does not change the adsorption mechanism of cement for Co2+. Adsorption experiments show that carbonation reduces the adsorption capacity of cement. In general, the adsorption of Co2+ by both pristine and carbonated cement involves multiple mechanisms including ion exchange and chemical adsorption. This study provides critical data for safety assessments of the geological disposal repository.