摘要
Post-synthetic functionalization of covalent organic frameworks(COFs)is an alternative way to enhance and broaden their properties and potential applications.However,the chemical functionalization of COFs is a great challenge because traditional procedures are often time-and energy-consuming,while the crystallinity of COFs can be damaged under harsh conditions.Here we report the in-situ introduction of functional graft chains onto the skeleton of COFs during the synthesis process through the combination of radiation-induced synthesis and graft polymerization techniques under ^(60)Co gamma-ray radiation.The synthesis and functionalization of COFs are simultaneously accomplished in a chemical system under ambient conditions yielding a large number of different functionalized COFs.The obtained carboxyl-functionalized COFs exhibit excellent radioactive uranium removal capabilities from aqueous solution with fast uptake dynamics,high adsorption capacity,and excellent selectivity over other competing metal ions.
基金
supported by the National Key R&D Program of China(2021YFB3200400)
the National Natural Science Foundation of China(21825601,21790374)
the fellowship of China National Postdoctoral Program for Innovative Talents(BX20220223)
the fellowship of China Postdoctoral Science Foundation(2022M710103)
Jiangsu Postdoctoral Program for Excellence(2022ZB588)。
