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<p>This study investigated the interactions of two superplasticizers (SPs) with various cementitious materials to assess their impact on radionuclide retention in cement barriers used for radioactive waste disposal. Batch sorption experiments and <i>ζ</i>-potential measurements evaluated SP retention and its influence on the surface properties of these solids. Sorption of <sup>152</sup>Eu and <sup>238</sup>Pu on the cementitious materials remained very high (<i>Kd</i> &gt; 10<sup>4</sup>&#xa0;mL&#xa0;g⁻<sup>1</sup>), with no significant effects observed in the presence of SPs at realistic concentrations (0.5–5% wt). The mechanism likely ensuring radionuclide retention involves the formation of ternary complexes among cementitious solids, SPs, and radionuclides.</p>

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Adsorption of superplasticizers on cementitious solids and impact on 152Eu and 238Pu sorption

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月10日

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  • Oscar Almendros-Ginestà,
  • Elena Remedios-Nombela,
  • M. Teresa Sevilla del Pozo,
  • Miguel García-Gutiérrez,
  • Tiziana Missana

摘要

This study investigated the interactions of two superplasticizers (SPs) with various cementitious materials to assess their impact on radionuclide retention in cement barriers used for radioactive waste disposal. Batch sorption experiments and ζ-potential measurements evaluated SP retention and its influence on the surface properties of these solids. Sorption of 152Eu and 238Pu on the cementitious materials remained very high (Kd > 104 mL g⁻1), with no significant effects observed in the presence of SPs at realistic concentrations (0.5–5% wt). The mechanism likely ensuring radionuclide retention involves the formation of ternary complexes among cementitious solids, SPs, and radionuclides.