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

Abstract Uranium is a key element in the nuclear industry, but its unintended leakage has caused health and environmental concerns. Here we report a sp 2 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 UO 2 2+ 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 UO 2 2+ suitable for on-site and…

• NN
  National Natural Science Foundation of China

  Awards: 21675078, 21775065, and 21976077, 21976077, 21675078, 21775065
• NS
  Natural Science Foundation of Jiangxi Province

  Awards: 21775065, 20165BCB18022