Decorating Covalent Organic Frameworks with High-density Chelate Groups for Uranium Extraction  

作　　者：QIN Xudong TANG Xiaohui MA Yu XU Hong XU Qing YANG Weiting GU Cheng 

机构地区：[1]State Key Laboratory of Luminescent Materials and Devices,Institute of Polymer Optoelectronic Materials and Devices,South China University of Technology,Guangzhou 510640,P.R.China [2]Key Laboratory of Advanced Materials of Tropical Island Resources,Ministry of Eduction,School of Chemical Engineering and Technology,Hainan University,Haikou 570228,P.R.China [3]CAS Key Laboratory of Low-Carbon Conversion Science and Engineering,Shanghai Advanced Research Institute(SARI),Chinese Academy of Sciences(CAS),Shanghai 201210,P.R.China [4]Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,P.R.China [5]Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates,South China University of Technology,Guangzhou 510640,P.R.China

出　　处：《Chemical Research in Chinese Universities》2022年第2期433-439,共7页高等学校化学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.21975078,22061014);the Guangdong Basic and Applied Basic Research Foundation,China(No.2021A1515010311);the Natural Science Foundation of Guangdong Province,China(No.2019B030301003);the 111 Project,and the Thousand Youth Talents Plan.GU Cheng acknowledges the scholarship support from the China Scholarship Council(No.202006155049).

摘　　要：The extraction of uranium from aqueous solution is highly desirable for sustaining the increasing demand for environmental safety and nuclear fuel.Herein,we report a strategy using a two-step covalent modification for the synthesis of covalent organic frameworks(COFs)with high-density amidoxime chelate groups at periphery.The introduction of dense amidoxime groups plays a pivotal role in uranium adsorption.The resulting COF exhibits strong affinity with the distribution coefficient of 5.2×104 mL/g and a high adsorption capacity of 319.9 mg/g.The strategy could be expanded to identify and remove different contaminants by introducing special functional groups.

关 键 词：TWO-STEP post-synthetic modification HIGH-DENSITY AMIDOXIME URANIUM adsorption 

分 类 号：O64[理学—物理化学]