Journal
CCS CHEMISTRY
Volume 5, Issue 7, Pages 1540-1548Publisher
CHINESE CHEMICAL SOC
DOI: 10.31635/ccschem.022.202201966
Keywords
iodine; metal-sulfide framework; removal; active sites; dynamic adsorption
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SCU-SnS, an open metal-sulfide framework with three different types of active sites, exhibits superior iodine adsorption capacity through mechanisms such as charge balancing and strong binding affinity.
Efficient adsorption of gaseous radioiodine is pivotal for the sustainable development of nuclear energy and the long-term radiation safety of the ecological system. However, state-of-the-art adsorbents (e.g. metal-organic frameworks and covalent-organic frameworks) currently under exploration suffer severely 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 mainly determined by the iodine-adsorbent interaction consisting of noncovalent interactions 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 ability of iodine for pre-enrichment into the framework by charge-balancing NH4+ through N-H center dot center dot center dot I interaction, the efficient reduction of I-2 affording I- by S2-, and extremely high binding affinity between Sn4+ and I-, SCU-SnS exhibit a record-breaking iodine adsorption capacity (2.12 g/g) under dynamic breakthrough conditions and the 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 potential for the nuclear industry. [GRAPHICS] .
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