J. Mater. Sci. Technol. ›› 2023, Vol. 168: 265-275.DOI: 10.1016/j.jmst.2023.05.059

• Research Article • Previous Articles     Next Articles

Tunning the bandgap of MnO2 homojunction by building active high-index facet to achieve rapid electron transfer for enhanced photocatalytic sterilization

Tao Zhanga, Bo Lia, Chaofeng Wangb, Shuilin Wuc, Shengli Zhud, Hui Jiangd, Yufeng Zhengc, Zhaoyang Lid, Zhenduo Cuid, Yu Zhange, Paul K Chuf, Xiangmei Liua,b,*   

  1. aBiomedical Materials Engineering Research Center, Hubei Key Laboratory of Polymer Materials, Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, School of Materials Science and Engineering Hubei University, Wuhan 430062, China;
    bSchool of Health Science & Biomedical Engineering, Hebei University of Technology, Tianjin 300401, China;
    cSchool of Materials Science & Engineering, Peking University, Beijing 100871, China;
    dSchool of Materials Science & Engineering, the Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of China, Tianjin University, Tianjin 300072, China;
    eDepartment of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou 510080, China;
    fDepartment of Physics, Department of Materials Science and Engineering and Department of Biomedical Engineering, City University of Hong Kong, Hong Kong 999077, China
  • Received:2023-03-13 Revised:2023-05-06 Accepted:2023-05-24 Published:2024-01-01 Online:2023-12-25
  • Contact: *E-mail address: liuxiangmei1978@163.com (X. Liu)

Abstract: Photocatalysis has been a research hotspot in recent years, and the design and modification of photocatalysts have been the key points. Common methods for designing photocatalysts, including constructing heterojunctions and homojunctions, have been developed on the basis of heterojunctions. In this study, two homojunctions of manganese dioxide (MnO2), including a high-index crystal plane homojunction and a general homojunction, are prepared using a stepwise hydrothermal method. Using a capping agent, the high-index crystal surface of the MnO2 is exposed. It is found that the electron transport efficiency between the two components of the homojunction with high-index planes is higher and the adsorption capacity of the oxygen is stronger, which leads to higher photocatalytic efficiency. In addition, the newly designed high-index homojunction is used for the treatment of bacterial infections, and it kills Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) at rates of 99.95% ± 0.04% and 99.31% ± 0.25%, respectively. It also has excellent therapeutic effects on mouse wounds, which implies superb practical application value. This work provides a new strategy for the improved design of homojunctions and the application of photocatalytic materials.

Key words: Photocatalysis, Homojunction, Bandgap, High-index facet, Antibacterial