Superior Iodine Uptake Capacities Enabled by an Open Metal-Sulfide Framework Composed of Three Types of Active Sites

Abstract
Efficient adsorption of gaseous radioiodine is pivotal for the sustainable development of nuclear energy and long-term safety of the ecological system. However, state of art adsorbents (e.g. MOFs and COFs) currently under exploration severely suffer from limited adsorption capacity, especially under a real-world scenario with extremely low radioiodine concentration and elevated temperature. This mostly originates from the relatively weak sorption driving forces determined by the iodine-adsorbent interaction consisting of non-covalent interactions in major with a small fraction of strong chemical bonding. Here, we document the discovery of an open metal-sulfide framework ((NH4)2(Sn3S7), donated as SCU-SnS) constructed by three different types of active sites as a superior iodine adsorbent. Benefiting from the iodine pre-enrich ability into the framework by charge-balancing NH4+ through N-H⋯I interaction, the efficient reduction of I2 affording I- by S2-, and extremely high binding affinity between Sn4+ and I-, SCU-SnS exhibits record-breaking iodine adsorption capacity (2.12 g/g) under dynamic breakthrough conditions and highest static capacity (6.12 g/g) among all reported inorganic adsorbents both at 348 K. Its facile synthesis and low cost endow SCU-SnS with powerful application potentials in the nuclear industry.

Citation
Zhang, Y., He, L., Pan, T., Xie, J., Wu, F., Dong, X., Wang, X., Chen, L., Gong, S., Liu, W., Kang, L., Chen, J., Chen, L., Chen, L., Han, Y., & Wang, S. (2022). Superior Iodine Uptake Capacities Enabled by an Open Metal-Sulfide Framework Composed of Three Types of Active Sites. CCS Chemistry, 1–21. https://doi.org/10.31635/ccschem.022.202201966

Acknowledgements
The authors gratefully acknowledge the financial support from the National Key R&D Program of China (2021YFB3200400 and 2018YFB1900203), the National Natural Science Foundation of China (21825601, 21790374, 22176139, 21906113, and 22176163), Young Taishan Scholars Program (tsqn201909082), and the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX22_3212)

Publisher
Chinese Chemical Society

Journal
CCS Chemistry

DOI
10.31635/ccschem.022.202201966

Additional Links
http://www.chinesechemsoc.org/doi/10.31635/ccschem.022.202201966

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