Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2025, Vol. 69: 123-134.DOI: 10.1016/S1872-2067(24)60171-3

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Revealing the regulatory mechanism of built-in electric field in defective mesoporous MIL-125(Ti)@BiOCl S-scheme heterojunctions toward optimized photocatalytic performance

Tingting Hua,b, Panpan Fengc,*(), Hongqi Chub,*(), Teng Gaob, Fusheng Liua,*(), Wei Zhoub,*()   

  1. aState Key Laboratory Base for Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, Shandong, China
    bShandong Provincial Key Laboratory of Molecular Engineering, School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, Shandong, China
    cSchool of Chemistry and Pharmaceutical Engineering, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan 250117, Shandong, China
  • Received:2024-08-24 Accepted:2024-10-15 Online:2025-02-18 Published:2025-02-10
  • Contact: E-mail: zwchem@hotmail.com (W. Zhou), Fpanpanlhz@163.com (P. Feng), hqchu@qlu.edu.cn (H. Chu), liufusheng63@sina.com (F. Liu).
  • Supported by:
    National Natural Science Foundation of China(52172206);Natural Science Foundation of Shandong Province(ZR2023QB110);Natural Science Foundation of Shandong Province(ZR2024MB155);Basic Research Projects for the Pilot Project of Integrating Science and Education and Industry of Qilu University of Technology (Shandong Academy of Sciences)(2023PX108);Talent Research Project of Qilu University of Technology (Shandong Academy of Sciences)(2023RCKY099);Talent Research Project of Qilu University of Technology (Shandong Academy of Sciences)(2024RCKY018);and the Special Fund for Taishan Scholars Project and the Development Plan of Youth Innovation Team in Colleges and Universities of Shandong Province

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Abstract:

The rational configuration of built-in electric field (IEF) in heterogeneous materials can significantly optimize the band structure to accelerate the separation of photogenerated charge carriers. However, the strength modulation of IEF formed by various materials has an uncertain enhancing effect on the separation of photogenerated carriers. Herein, a mesoporous MIL-125(Ti)@BiOCl S-scheme heterojunction with controllable IEF is prepared by green photoreduction reaction to investigate the relationship between IEF, microstructure, and photocatalytic activity. Moreover, the corresponding results demonstrate the MIL-125(Ti)@BiOCl effectively regulates the IEF strength through controlling the concentration of ligand defects, thereby optimizing the band structure and improving the efficiency of photogenerated charge separation. The optimized IEF significantly enhances the photocatalytic degradation performance of mesoporous MIL-125(Ti)-3@BiOCl towards tetracycline, with a k value of 0.07 min−1, which are approximately 5.5 and 4.7 times greater than that of BiOCl (0.0127 min−1) and MIL-125(Ti)-3 (0.015 min−1). These findings provide a new pathway for regulating IEF within MOF-based heterojunctions, and offer new insights into the intrinsic correlations between defect structure, IEF, and photocatalytic activity.

Key words: Photocatalysis, Built-in electric field, Metal-organic framework, BiOCl, Ligand defect