Regenerable and stable sp2 carbon-conjugated covalent organic frameworks for selective detection and extraction of uranium

Wei-Rong Cui, Cheng-Rong Zhang, Wei Jiang, Fang-Fang Li, Ru-Ping Liang, Juewen Liu and Jian-Ding Qiu ()
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Wei-Rong Cui: Nanchang University
Cheng-Rong Zhang: Nanchang University
Wei Jiang: Nanchang University
Fang-Fang Li: Nanchang University
Ru-Ping Liang: Nanchang University
Juewen Liu: University of Waterloo, Waterloo
Jian-Ding Qiu: Nanchang University

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Uranium is a key element in the nuclear industry, but its unintended leakage has caused health and environmental concerns. Here we report a sp2 carbon-conjugated fluorescent covalent organic framework (COF) named TFPT-BTAN-AO with excellent chemical, thermal and radiation stability is synthesized by integrating triazine-based building blocks with amidoxime-substituted linkers. TFPT-BTAN-AO shows an exceptional UO22+ adsorption capacity of 427 mg g−1 attributable to the abundant selective uranium-binding groups on the highly accessible pore walls of open 1D channels. In addition, it has an ultra-fast response time (2 s) and an ultra-low detection limit of 6.7 nM UO22+ suitable for on-site and real-time monitoring of UO22+, allowing not only extraction but also monitoring the quality of the extracted water. This study demonstrates great potential of fluorescent COFs for radionuclide detection and extraction. By rational designing target ligands, this strategy can be extended to the detection and extraction of other contaminants.

Date: 2020
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DOI: 10.1038/s41467-020-14289-x

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