期刊
CHEMISTRY OF MATERIALS
卷 31, 期 5, 页码 1628-1634出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.8b04877
关键词
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资金
- National Science Foundation [DMR-1708254]
- NSFC [51762039, 21871167]
- 1331 project
- National Plan for 10 000 Talents in China
- [2017XS03]
Removal of Cs-137(+), one of the most hazardous radionuclides, from nuclear waste, is a challenging task because it requires simultaneously high capacity and high selectivity. Chalcogenides offer a great opportunity to design and create high-performance Cs-137(+) absorbents. We report a new material (InSnOS) with facile ion-exchange properties. The anionic framework is based on corner-shared pseudo-T4 supertetrahedral oxysulfide [In8Sn12O10S34](16-) clusters, resulting in the formula [In8Sn12O10S32](12-). The crystal structure features the interpenetration of two independent oxysulfide cluster frameworks which create pincer cavities based on sulfur atoms that prove highly effective for capturing Cs+ ions. The binding mode of the Cs+ ions by the material was determined by a single crystal structure refinement of a fully ion-exchanged single crystal. The structure determinations show that the small pores created by the two interpenetrating frameworks are the optimal size for capturing Cs+. This advantage makes the material very effective for the removal and recovery of Cs-137(+) from aqueous solution. This framework shows not only extremely high exchange capacity (q(m)), 537.7 mg per g of anionic [In8Sn12O10S32](12-) framework, ranking it among the best reported Cs+ sorbents, but also superior affinity and selectivity when using complex solutions simulating industrial and nuclear waste conditions.
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