“Ion-imprinting” strategy towards metal sulfide scavenger enables the highly selective capture of radiocesium

Jun-Hao Tang, Shao-Qing Jia, Jia-Ting Liu, Lu Yang, Hai-Yan Sun, Mei-Ling Feng () and Xiao-Ying Huang
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Jun-Hao Tang: Chinese Academy of Sciences
Shao-Qing Jia: HTA Co., Ltd.
Jia-Ting Liu: Chinese Academy of Sciences
Lu Yang: Chinese Academy of Sciences
Hai-Yan Sun: Chinese Academy of Sciences
Mei-Ling Feng: Chinese Academy of Sciences
Xiao-Ying Huang: Chinese Academy of Sciences

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

Abstract: Abstract Highly selective capture of radiocesium is an urgent need for environmental radioactive contamination remediation and spent fuel disposal. Herein, a strategy is proposed for construction of “inorganic ion-imprinted adsorbents” with ion recognition-separation capabilities, and a metal sulfide Cs2.33Ga2.33Sn1.67S8·H2O (FJSM-CGTS) with “imprinting effect” on Cs+ is prepared. We show that the K+ activation product of FJSM-CGTS, Cs0.51K1.82Ga2.33Sn1.67S8·H2O (FJMS-KCGTS), can reach adsorption equilibrium for Cs+ within 5 min, with a maximum adsorption capacity of 246.65 mg·g−1. FJMS-KCGTS overcomes the hindrance of Cs+ adsorption by competing ions and realizes highly selective capture of Cs+ in complex environments. It shows successful cleanup for actual 137Cs-liquid-wastes generated during industrial production with removal rates of over 99%. Ion-exchange column filled with FJMS-KCGTS can efficiently treat 540 mL Cs+-containing solutions (31.995 mg·L−1) and generates only 0.12 mL of solid waste, which enables waste solution volume reduction. Single-crystal structural analysis and density functional theory calculations are used to visualize the “ion-imprinting” process and confirm that the “imprinting effect” originates from the spatially confined effect of the framework. This work clearly reveals radiocesium capture mechanism and structure-function relationships that could inspire the development of efficient inorganic adsorbents for selective recognition and separation of key radionuclides.

Date: 2024
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DOI: 10.1038/s41467-024-48565-x

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