Citation: Junjie Yu, Yichen Huang, Pengcheng Zhang, Shusen Chen, Yan Song, Congzhi Wang, Zijie Li, Liyong Yuan, Jipan Yu, Nannan Wang, Weiqun Shi. Pore surface engineering of hydrazone-linked covalent organic framework with tailor-made chelating sites for uranium extraction from seawater[J]. Chinese Chemical Letters, ;2026, 37(3): 111378. doi: 10.1016/j.cclet.2025.111378 shu

Pore surface engineering of hydrazone-linked covalent organic framework with tailor-made chelating sites for uranium extraction from seawater

Junjie Yu ^{a, b} ,
Yichen Huang ^{a, c} ,
Pengcheng Zhang ^a ,
Shusen Chen ^d ,
Yan Song ^d ,
Congzhi Wang ^a ,
Zijie Li ^a ,
Liyong Yuan ^a ,
Jipan Yu ^{a, *,} ,
Nannan Wang ^{b, *,} ,
Weiqun Shi ^{a, e, *,}

a.
Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
b.
State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, and School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
c.
School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China
d.
CNNC Key Laboratory on Uranium Extraction from Seawater, Beijing Research Institute of Chemical Engineering and Metallurgy, Beijing 101149, China
e.
Institute of Nuclear Fuel cycle and Materials, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

yujipan@ihep.ac.cn

wangnannan@gxu.edu.cn

shiwq@sjtu.edu.cn

Received Date: 17 March 2025
Revised Date: 12 May 2025
Accepted Date: 26 May 2025
Available Online: 29 May 2025

Figures(5)

The extraction of uranium from seawater is essential for the sustainable development of the nuclear industry. Covalent organic frameworks (COFs) exhibit significant potential in uranium extraction from seawater due to their high stability, designability, and large specific surface area. Herein, a vinyl-decorated covalent organic framework, designated as COF-IHEP5, was synthesized through acid-catalyzed solvothermal method. COF-IHEP5-COOH was constructed by post-modification strategy through the "thiol-ene" click reaction, where COF-IHEP5-COOH contains hydrazone-carbonyl and flexible carboxylic acid chelating sites on pore wall. This modification facilitates synergistic adsorption of uranium by utilizing a "nano trap" that is embedded within the COF framework. The maximum adsorption capacity of the post-modified COF-IHEP5-COOH for UO₂²⁺ has reached 543.8 mg/g, representing a 1.5-fold increase compared to the unmodified COF-IHEP5. Additionally, COF-IHEP5-COOH demonstrates an extraction efficiency of approximately 80% for uranium from spiked natural seawater, featuring 4.5 times higher selectivity than vanadium. The DFT calculation results show that the adsorption of uranium orginated from the synergistic coordination of the skeleton in COF-IHEP5-COOH and carboxyl group on the side arm. This research highlights the remarkable potential of pore surface engineering in customizing active adsorption sites and offers new insights for the design of functionalized uranium adsorbents with superior binding affinity and adsorption capacities.
- Covalent organic framework,
- Uranium extraction from seawater,
- Adsorption and separation,
- Thiol-ene click reaction,
- Post-modification
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