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Abstract <p>Geopolymer matrices based on alkali-activated natural aluminosilicates—kaolinite and clinoptilolite—are obtained. Their potential application for the immobilization of radionuclides is studied using Cs<sup>+</sup> as an example. The optimal kaolinite/clinoptilolite ratios are determined, enabling the production of matrices with compressive strengths of up to 40 MPa and an immobilized cesium content of up to 1.5 wt % (as Cs<sub>2</sub>O). The leaching rate of Cs<sup>+</sup> from the geopolymer matrix is estimated in aqueous and alkaline environments. It is shown that geopolymer matrices are promising materials for the disposal of radioactive waste.</p>

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Development of Geopolymeric Kaolinite/Clinoptilolite Matrices for Radioactive Waste Disposal

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • A. A. Alekseev,
  • A. V. Kuz’mina,
  • E. Yu. Brazovskaya,
  • Yu. A. Alikina,
  • L. N. Kurilenko,
  • O. Yu. Golubeva

摘要

Abstract

Geopolymer matrices based on alkali-activated natural aluminosilicates—kaolinite and clinoptilolite—are obtained. Their potential application for the immobilization of radionuclides is studied using Cs+ as an example. The optimal kaolinite/clinoptilolite ratios are determined, enabling the production of matrices with compressive strengths of up to 40 MPa and an immobilized cesium content of up to 1.5 wt % (as Cs2O). The leaching rate of Cs+ from the geopolymer matrix is estimated in aqueous and alkaline environments. It is shown that geopolymer matrices are promising materials for the disposal of radioactive waste.