Chinese Journal of Catalysis ›› 2025, Vol. 68: 259-271.DOI: 10.1016/S1872-2067(24)60181-6

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Interfacial Mo-S bond modulated S-scheme Mn0.5Cd0.5S/Bi2MoO6 heterojunction for boosted photocatalytic removal of emerging organic contaminants

Shijie Lia,*(), Changjun Youa, Fang Yangb, Guijie Liangc, Chunqiang Zhuangd,*(), Xin Lie,*()   

  1. aKey Laboratory of Health Risk Factors for Seafood of Zhejiang Province, National Engineering Research Center for Marine Aquaculture, College of Marine Science and Technology, Zhejiang Ocean University, Zhoushan 316022, Zhejiang, China
    bSchool of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
    cHubei Key Laboratory Low Dimens Optoelect Mat & Devices, Hubei University of Arts and Science, Xiangyang 441053, Hubei, China
    dInstitute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124, China
    eInstitute of Biomass Engineering, Key Laboratory of Energy Plants Resource and Utilization, Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou 510642, Guangdong, China
  • Received:2024-07-24 Accepted:2024-10-11 Online:2025-01-18 Published:2025-01-02
  • Contact: * E-mail: lishijie@zjou.edu.cn (S. Li), chunqiang.zhuang@bjut.edu.cn (C. Zhuang), xinli@scau.edu.cn (X. Li).
  • Supported by:
    National Natural Science Foundation of China(U1809214);Natural Science Foundation of Zhejiang Province(LY20E080014);Natural Science Foundation of Zhejiang Province(LTGN23E080001);Science and Technology Project of Zhoushan(2022C41011)

Abstract:

Inefficient photo-carrier separation and sluggish photoreaction dynamics appreciably undermine the photocatalytic decontamination efficacy of photocatalysts. Herein, an S-scheme Mn0.5Cd0.5S/Bi2MoO6 heterojunction with interfacial Mo-S chemical bond is designed as an efficient photocatalyst. In this integrated photosystem, Bi2MoO6 and Mn0.5Cd0.5S function as oxidation and reduction centers of Mn0.5Cd0.5S/Bi2MoO6 microspheres, respectively. Importantly, the unique charge transfer mechanism in the chemically bonded S-scheme heterojunction with Mo-S bond as atom-scale charge transport highway effectively inhibits the photocorrosion of Mn0.5Cd0.5S and the recombination of photo-generated electron-hole pairs, endowing Mn0.5Cd0.5S/Bi2MoO6 photocatalyst with excellent photocatalytic decontamination performance and stability. Besides, integration of Mn0.5Cd0.5S nanocrystals into Bi2MoO6 improves hydrophilicity, conducive to the photoreactions. Strikingly, compared with Mn0.5Cd0.5S and Bi2MoO6, the Mn0.5Cd0.5S/Bi2MoO6 unveils much augmented photoactivity in tetracycline eradication, among which Mn0.5Cd0.5S/Bi2MoO6-2 possesses the highest activity with the rate constant up to 0.0323 min‒1, prominently outperforming other counterparts. This research offers a chemical bonding engineering combining with S-scheme heterojunction strategy for constructing extraordinary photocatalysts for environmental purification.

Key words: Mn0.5Cd0.5S/Bi2MoO6, Interfacial chemical bond, S-scheme heterojunction, Emerging organic contaminants, Internal electric field, Photocatalysis