SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2025, Vol. 80 ›› Issue (4): 70-78.DOI: 10.1016/j.cjche.2024.12.006

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Screening suitable metal ion bridges for the construction of unimpeded dual carrier-transfer channels in carbon nitride photocatalyst

Meixian Liu1,2,3, Shuyun Xue3, Yajun Zhang5, Linjuan Pei4, Zhanfeng Zheng2   

  1. 1 School of Basic Medical Science, Shanxi Medical University, Taiyuan 030001, China;
    2 State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
    3 School and Hospital of Stomatology, Shanxi Medical University, Taiyuan 030001, China;
    4 School of Chemistry and Material Science, Shanxi Normal University, Taiyuan 030032, China;
    5 State Key Laboratory for Oxo Synthesis & Selective Oxidation, Lanzhou Institute of Chemical Physics, Lanzhou 730000, China
  • Received:2024-09-26 Revised:2024-12-18 Accepted:2024-12-19 Online:2025-02-26 Published:2025-04-28
  • Contact: Meixian Liu,E-mail:liumx@sxmu.edu.cn;Linjuan Pei,E-mail:20210124@sxnu.edu.cn;Zhanfeng Zheng,E-mail:zfzheng@sxicc.ac.cn
  • Supported by:
    This work is supported by the National Natural Science Foundation of China (82301052), China Postdoctoral Science Foundation (2023M732151), Shanxi Provincial Science and Technology Department (202303021212131), Health Commission of Shanxi Province (2022XM14), Shanxi Provincial Education Department (2022L165), Shanxi Medical University (XD2232).

Screening suitable metal ion bridges for the construction of unimpeded dual carrier-transfer channels in carbon nitride photocatalyst

Meixian Liu1,2,3, Shuyun Xue3, Yajun Zhang5, Linjuan Pei4, Zhanfeng Zheng2   

  1. 1 School of Basic Medical Science, Shanxi Medical University, Taiyuan 030001, China;
    2 State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
    3 School and Hospital of Stomatology, Shanxi Medical University, Taiyuan 030001, China;
    4 School of Chemistry and Material Science, Shanxi Normal University, Taiyuan 030032, China;
    5 State Key Laboratory for Oxo Synthesis & Selective Oxidation, Lanzhou Institute of Chemical Physics, Lanzhou 730000, China
  • 通讯作者: Meixian Liu,E-mail:liumx@sxmu.edu.cn;Linjuan Pei,E-mail:20210124@sxnu.edu.cn;Zhanfeng Zheng,E-mail:zfzheng@sxicc.ac.cn
  • 基金资助:
    This work is supported by the National Natural Science Foundation of China (82301052), China Postdoctoral Science Foundation (2023M732151), Shanxi Provincial Science and Technology Department (202303021212131), Health Commission of Shanxi Province (2022XM14), Shanxi Provincial Education Department (2022L165), Shanxi Medical University (XD2232).

Abstract: The huge carrier transfer resistance caused by large-sized “nitrogen pot” severely limits the photocatalytic performance of carbon nitride (CN). This study aims to explore the selection principle of metal ion bridges for constructing dual carrier-transfer channels to delivery carriers to respectively active sites using photodegradation of phenol as the model reaction. Density functional theory (DFT) calculation was used to optimize the structure model of nitrogen vacancies (NV, provide active sites for reduction of O2 and oxidation of phenol) and metal ions (Fe3+, Co2+, Ni2+ or Cu2+) co-modified CN, and screen metal ion bridges based on the three parameters including bonding state of metal ion and “nitrogen pot”, electrostatic potential (ESP) distribution around the active sites, and three-electron bond length. Both calculation results and activity data show that Fe3+, Co2+ and Ni2+ can construct dual carrier-transfer channels to promote the degradation of phenol while Cu2+ cannot. NV and Fe3+ co-modified CN (Fe/NV-CN) showed the best catalytic performance among various catalysts and was used as the model catalyst for the detailed characterization to verify the calculation results. This work provides not only the novel strategy for constructing dual carrier-transfer channels in CN, but also the crucial basis for computer simulation as a prediction tool of catalyst structure design rationality.

Key words: Carbon nitride, Dual carrier-transfer channels, Metal ion bridges, Degradation, Computer simulation, Radical

摘要: The huge carrier transfer resistance caused by large-sized “nitrogen pot” severely limits the photocatalytic performance of carbon nitride (CN). This study aims to explore the selection principle of metal ion bridges for constructing dual carrier-transfer channels to delivery carriers to respectively active sites using photodegradation of phenol as the model reaction. Density functional theory (DFT) calculation was used to optimize the structure model of nitrogen vacancies (NV, provide active sites for reduction of O2 and oxidation of phenol) and metal ions (Fe3+, Co2+, Ni2+ or Cu2+) co-modified CN, and screen metal ion bridges based on the three parameters including bonding state of metal ion and “nitrogen pot”, electrostatic potential (ESP) distribution around the active sites, and three-electron bond length. Both calculation results and activity data show that Fe3+, Co2+ and Ni2+ can construct dual carrier-transfer channels to promote the degradation of phenol while Cu2+ cannot. NV and Fe3+ co-modified CN (Fe/NV-CN) showed the best catalytic performance among various catalysts and was used as the model catalyst for the detailed characterization to verify the calculation results. This work provides not only the novel strategy for constructing dual carrier-transfer channels in CN, but also the crucial basis for computer simulation as a prediction tool of catalyst structure design rationality.

关键词: Carbon nitride, Dual carrier-transfer channels, Metal ion bridges, Degradation, Computer simulation, Radical