Covalent organic frameworks(COFs)have emerged as auspicious porous adsorbents for radioiodine capture.However,their conventional solvothermal synthesis demands multiday synthetic times and anaerobic conditions,largely...Covalent organic frameworks(COFs)have emerged as auspicious porous adsorbents for radioiodine capture.However,their conventional solvothermal synthesis demands multiday synthetic times and anaerobic conditions,largely hampering their practical use.To tackle these challenges,we present a facile microwave-assisted synthesis of 2D imine-linked COFs,Mw-TFB-BD-X,(X=−CH_(3) and−OCH_(3))under air within just 1 h.The resultant COFs possessed higher crystallinity,better yields,and more uniform morphology than their solvothermal counterparts.Remarkably,Mw-TFB-BD-CH_(3) and Mw-TFB-BDOCH_(3) exhibited exceptional iodine adsorption capacities of 7.83 g g^(−1) and 7.05 g g^(−1),respectively,placing them among the bestperforming COF adsorbents for static iodine vapor capture.Moreover,Mw-TFB-BD-CH_(3) and Mw-TFB-BD-OCH_(3) can be reused 5 times with no apparent loss in the adsorption capacity.The exceptionally high iodine adsorption capacities and excellent reusability of COFs were mainly attributed to their uniform spherical morphology and enhanced chemical stability due to the in-built electron-donating groups,despite their low surface areas.This work establishes a benchmark for developing advanced iodine adsorbents that combine fast kinetics,high capacity,excellent reusability,and facile rapid synthesis,a set of appealing features that remain challenging to merge in COF adsorbents so far.展开更多
基金supported by the U.S.Department of Energy Office of Science Early Career Research Program(DESC0022000)the National Science Foundation HBCU-UPRIA program(no.2100360)+2 种基金the U.S.Department of Defense,the Office of Naval Research(no:N00014-20-1-2523)supported by the Office of Science,Office of Basic Energy Sciences,of the U.S.Department of Energy under Contract No.DE-AC02-05CH11231the support from Qassim University.S.C.is grateful for the support from the National Natural Science Foundation of China(no.22171092).
文摘Covalent organic frameworks(COFs)have emerged as auspicious porous adsorbents for radioiodine capture.However,their conventional solvothermal synthesis demands multiday synthetic times and anaerobic conditions,largely hampering their practical use.To tackle these challenges,we present a facile microwave-assisted synthesis of 2D imine-linked COFs,Mw-TFB-BD-X,(X=−CH_(3) and−OCH_(3))under air within just 1 h.The resultant COFs possessed higher crystallinity,better yields,and more uniform morphology than their solvothermal counterparts.Remarkably,Mw-TFB-BD-CH_(3) and Mw-TFB-BDOCH_(3) exhibited exceptional iodine adsorption capacities of 7.83 g g^(−1) and 7.05 g g^(−1),respectively,placing them among the bestperforming COF adsorbents for static iodine vapor capture.Moreover,Mw-TFB-BD-CH_(3) and Mw-TFB-BD-OCH_(3) can be reused 5 times with no apparent loss in the adsorption capacity.The exceptionally high iodine adsorption capacities and excellent reusability of COFs were mainly attributed to their uniform spherical morphology and enhanced chemical stability due to the in-built electron-donating groups,despite their low surface areas.This work establishes a benchmark for developing advanced iodine adsorbents that combine fast kinetics,high capacity,excellent reusability,and facile rapid synthesis,a set of appealing features that remain challenging to merge in COF adsorbents so far.
