Chemical Research in Chinese Universities ›› 2022, Vol. 38 ›› Issue (2): 433-439.doi: 10.1007/s40242-022-1463-9

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

QIN Xudong1,2, TANG Xiaohui1, MA Yu2, XU Hong4, XU Qing3, YANG Weiting2, GU Cheng1,5   

  1. 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
  • Received:2021-11-18 Revised:2021-12-13 Online:2022-04-01 Published:2022-05-18
  • Contact: GU Cheng, YANG Weiting, XU Qing E-mail:gucheng@scut.edu.cn;yangwt@hainanu.edu.cn;xuqing@sari.ac.cn
  • Supported by:
    This work was 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).

Abstract: 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.

Key words: Two-step post-synthetic modification, High-density amidoxime, Uranium adsorption