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Factors affecting the hydrothermal synthesis and durability of pollucite: towards the practical radioactive Cs immobilization

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Abstract

Hydrothermal synthesis of pollucite by investigating the experimental parameters of heating time, alkalinity, additional Na+ and Ca2+, Cs+–Na+ and Cs+–K+ replacement, at basic bulk composition of Cs2O:Al2O3:4SiO2:111H2O was conducted, and ion exchange behavior of the synthesized pollucite was discussed. Results showed that alkaline (OH−) was a key factor governing the formation of pollucite, where additional alkali was necessary for practical soil decontamination. Pollucite structure was stable under the coexistence or replacement of other cations, and Cs2O content was reduced partly by the co-crystallizaiton of other metal ions. Under the surrounding of K+ or Na+, 14–17 mol% Cs+ in pollucite released from pollucite (220 °C), and there was a strict selectivity between ANA minerals and specific cations. For the harmless management of real radioactive Cs polluted soil, it is necessary to give careful evaluation on the immobilization ability of pollucite under the influence of other metal ions.

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Acknowledgements

This work was financially supported by the Natural Science Foundation of Hebei Province (D2019403110), the Young Foundation from Education Department of Hebei Province (QN2019070), and the Construction Subsidy for Academician Workstation (204790416H).

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Authors and Affiliations

  1. College of Gemmology and Materials Science, HeBei GEO University, No.136, Huai’an East Road, Shijiazhuang, 050031, People’s Republic of China

    Changjiang Liu,  Ling Guo & Xiaocong Tong

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  1. Changjiang Liu
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  2. Ling Guo
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  3. Xiaocong Tong
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Correspondence to Changjiang Liu.

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Liu, C., Guo, . & Tong, X. Factors affecting the hydrothermal synthesis and durability of pollucite: towards the practical radioactive Cs immobilization. J Radioanal Nucl Chem 329, 621–631 (2021). https://doi.org/10.1007/s10967-021-07809-6

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  • DOI: https://doi.org/10.1007/s10967-021-07809-6

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