Abstract
Kaolin was utilized as a raw material for geopolymers with various Si/Al ratios, and a hydrothermal-microwave treatment was proposed to obtain Cs-containing ceramics to immobilize 137Cs. The results show that with Si/Al from 1/1 to 3/1, the hydrothermal treatment will tend to produce CsAlSiO4, pollucite (CsAlSi2O6) and pollucite solid solutions, respectively. Following the hydrothermal reaction, a rapid microwave process (30 min) enhances the loose microstructure of hydrothermal products, and higher microwave temperatures promote pollucite crystallization. Cs-containing ceramics with high Cs content (31%) and low leaching rate (9.7 × 10−4 g m−2 d−1) are obtained at 800 °C with Si/Al ratio of 2/1.
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This work was supported by the Project Approved by the Natural science foundation of Hunan Province (Grant Nos. 2021JJ40463; 2020JJ5463); the Provincial Education Department of Hunan Province, China (No.19A420).
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Huang, P., He, Z., Xie, Y. et al. Rapid immobilization of Cs+ using Cs-containing ceramics obtained by hydrothermal-microwave treatment. J Radioanal Nucl Chem 332, 3813–3825 (2023). https://doi.org/10.1007/s10967-023-09070-5
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DOI: https://doi.org/10.1007/s10967-023-09070-5