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- Title
Selective incarceration of caesium ions by Venus flytrap action of a flexible framework sulfide.
- Authors
Ding, Nan; Kanatzidis, Mercouri G.
- Abstract
The selective capture of Cs+ from solution is relevant to the remediation of nuclear waste and remains a significant challenge. Here we describe a new framework composed of [(CH3)2NH2]+ and [Ga2Sb2S7]2− layers, which are perforated with holes. Shape selectivity couples with framework flexibility, allowing the compound to respond to the ion-exchange process. The size, shape and flexibility of the holes allow Cs+ ions in an aqueous solution to selectively pass through and enter the material via an ion-exchange process. Following capture, the structure dynamically closes its holes in a manner reminiscent of a Venus flytrap, which prevents the Cs+ ions from leaching out. This process has useful implications in the separation science of Cs as it relates to the clean-up of nuclear waste. The dynamic response we describe here provides important insights for designing new materials for the selective removal of difficult-to-capture ions.
- Subjects
RADIOACTIVE wastes; ION exchange (Chemistry); AQUEOUS polymeric coatings; VENUS'S flytrap; ELECTRONS; CESIUM; SOLUTION (Chemistry); CLEANUP of radioactive waste sites; INORGANIC compounds
- Publication
Nature Chemistry, 2010, Vol 2, Issue 3, p187
- ISSN
1755-4330
- Publication type
Article
- DOI
10.1038/nchem.519