期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 45, 页码 16110-16114出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201909718
关键词
metal-organic frameworks; photocatalysis; polyoxometalates; reduction; uranium
资金
- Science Challenge Project [TZ2016004]
- National Natural Science Foundation of China [21825601, 21790374, U1532259]
- China Postdoctoral Science Foundation [2019M651802]
- State Key Laboratory of Environment-friendly Energy Materials [17kffk16]
The design and synthesis of uranium sorbent materials with high uptake efficiency, capacity and selectivity, as well as excellent hydrolytic stability and radiation resistance remains a challenge. Herein, a polyoxometalate (POM)-organic framework material (SCU-19) with a rare inclined polycatenation structure was designed, synthesized through a solvothermal method, and tested for uranium separation. Under dark conditions, SCU-19 can efficiently capture uranium through ligand complexation using its exposed oxo atoms and partial chemical reduction from U-VI to U-IV by the lowvalent Mo atoms in the POM. An additional U-VI photocatalytic reduction mechanism can occur under visible light irradiation, leading to a higher uranium removal without saturation and faster sorption kinetics. SCU-19 is the only uranium sorbent material with three distinct sorption mechanisms, as further demonstrated by X-ray photoelectron spectroscopy (XPS) and X-ray absorption near edge structure (XANES) analysis.
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