Boosting selective Cs+ uptake through the modulation of stacking modes in layered niobate-based perovskites

Hai-Yan Sun, Zhi-Hua Chen, Bing Hu, Jun-Hao Tang, Lu Yang, Yan-Ling Guo, Yue-Xin Yao, Mei-Ling Feng () and Xiao-Ying Huang
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Hai-Yan Sun: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou
Zhi-Hua Chen: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou
Bing Hu: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou
Jun-Hao Tang: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou
Lu Yang: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou
Yan-Ling Guo: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou
Yue-Xin Yao: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou
Mei-Ling Feng: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou
Xiao-Ying Huang: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Selective separation of 137Cs is significant for the sustainable development of nuclear energy and environmental protection, due to its strong radioactivity and long half-life. However, selective capture of 137Cs+ from radioactive liquid waste is challenging due to strong coulomb interactions between the adsorbents and high-valency metal ions. Herein, we propose a strategy to resolve this issue and achieve specific Cs+ ion recognition and separation by modulating the stacking modes of layered perovskites. We demonstrate that among niobate-based perovskites, ALaNb2O7 (A = Cs, H, K, and Li), HLaNb2O7 shows an outstanding selectivity for Cs+ even in the presence of a large amount of competing Mn+ ions (Mn+ = K+, Ca2+, Mg2+, Sr2+, Eu3+, and Zr4+) owing to its suitable void fraction and space shape, brought by the stacking mode of layers. The Cs+ capture mechanism is directly elucidated at molecular level by single-crystal structural analyses and density functional theory calculations. This work not only provides key insights in the design and property optimization of perovskite-type materials for radiocesium separation, but also paves the way for the development of efficient inorganic materials for radionuclides remediation.

Date: 2024
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DOI: 10.1038/s41467-024-52920-3

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