A Molecular Coordination Template Strategy for Designing Selective Porous Aromatic Framework Materials for Uranyl Capture
| Autor: | Hongming He, Dan Deng, Haoyan Sha, Zeyu Wang, Yihan Huang, Ye Yuan, Qinghao Meng, Fuxing Sun, Muhammad Faheem, Yajie Yang, Zhangnan Li, Guangshan Zhu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Energy demand
Materials science 010405 organic chemistry business.industry General Chemical Engineering Fossil fuel Vanadium chemistry.chemical_element General Chemistry Uranium 010402 general chemistry Uranyl 01 natural sciences 0104 chemical sciences Chemistry chemistry.chemical_compound Chemical engineering chemistry Seawater business Porosity QD1-999 Volume concentration Research Article |
| Zdroj: | ACS Central Science ACS Central Science, Vol 5, Iss 8, Pp 1432-1439 (2019) |
| ISSN: | 2374-7951 2374-7943 |
| DOI: | 10.1021/acscentsci.9b00494 |
| Popis: | Uranium capture from seawater could solve increasing energy demand and enable a much needed relaxing from fossil fuels. Low concentration (∼3 ppb), competing cations (especially vanadium) and pH-dependent speciation prohibit highly efficient uranium uptake. Despite intensive research, selective extraction of uranyl ions over vanadyl units remains a tremendous challenge. Here, we adopted a molecular coordination template strategy to design a uranyl-specific bis-salicylaldoxime entity and decorated it into a highly porous aromatic framework (PAF-1) by programmable assembly. The superstructure (MISS-PAF-1) gives a strong affinity that removes 99.97% of uranium in 120 min. Notably, it binds to the uranyl ion at least 100 times more selectively than 14 different cations tested, including the vanadyl ion, in simulated seawater at ambient pH. Real seawater samples collected from the Bohai Sea achieve 5.79 mg g–1 of uranium capacity over 56 days without PAF degradation, exceeding a 4-fold higher amount than commercial adsorbents. A uranyl-specific bis-salicylaldoxime entity is designed and decorated in the porous skeleton with a shape persistent structure, which enforces specific bonding geometries to uranyl ions. |
| Databáze: | OpenAIRE |
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