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Decorating covalent organic frameworks with high-density chelate groups for uranium extraction#br# QIN#br#

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 modifica-tion 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 coeffi-cient of 5.2×104 mL g-1 and a high adsorption capacity of 319.9 mg g-1. The strategy could be expanded to identify and remove different con-taminants by introducing special functional groups.#br#

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  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. MOE Key Laboratory of Advanced Materials of Tropical Island Resources,
    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:2021-12-12 Accepted:2021-12-13 Online:2021-12-14 Published:2021-12-14
  • Contact: GU Cheng gucheng@scut.edu.cn  YANG Weiting yangwt@hainanu.edu.cn  XU Qing xuqing@sari.ac.cn
  • Supported by:
    the National Natural Science Foundation of China (21975078 and 22061014), the Guangdong Basic and Applied Basic Research Foundation (2021A1515010311), the Natural Science Foundation of Guangdong Province (2019B030301003), the 111 Project, and the Thousand Youth Talents Plan. C. Gu acknowledges the scholarship support from the China Scholarship Council (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 modifica-tion 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 coeffi-cient of 5.2×104 mL g-1 and a high adsorption capacity of 319.9 mg g-1. The strategy could be expanded to identify and remove different con-taminants by introducing special functional groups.


Key words:  two-step post-synthetic modification, high-density amidoxime, ura-nium adsorption