J. Mater. Sci. Technol. ›› 2024, Vol. 196: 40-49.DOI: 10.1016/j.jmst.2024.01.048

Special Issue: Catalytic materials 2024

• Reserch Article • Previous Articles     Next Articles

2D/2D layered BiOIO3/g-C3N4 S-scheme heterojunction for photocatalytic NO oxidation

Xiaofeng Wua,b,1, Ningxin Kangb,1, Xiaofang Lia,*, Zhihua Xuc,*, Sónia A.C. Carabineirod, Kangle Lvb,*   

  1. aCollege of Chemistry and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China;
    bCollege of Resources and Environment, South-Central Minzu University, Wuhan 430074, China;
    cSchool of Optoelectronic Materials and Technology, Jianghan University, Wuhan 430056, China;
    dLAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade NOVA de Lisboa Caparica, 2829-516, Portugal
  • Received:2023-10-03 Revised:2024-01-11 Accepted:2024-01-12 Published:2024-10-10 Online:2024-03-08
  • Contact: * E-mail addresses: xfli@whpu.edu.cn (X. Li), zhihuaxu@jhun.edu.cn (Z. Xu), lvkangle@mail.scuec.edu.cn (K. Lv).
  • About author:1 These authors contributed equally to this work.

Abstract: It is essential to promote interfacial separation and charge migration in heterojunctions for effectively driving surface photocatalytic reactions. In this work, we report the construction of a 2D/2D layered BiOIO3/g-C3N4 (BIO/CN) heterojunction for photocatalytic NO removal. The BIO/CN heterojunction exhibits a remarkably higher NO photo-oxidation removal rate (46.9%) compared to pristine BIO (20.1%) and CN (25.9%) under visible-light irradiation. Additionally, it effectively suppresses the formation of toxic NO2 intermediates during photocatalytic reaction. The improved photocatalytic performance of BIO/CN composite is caused by its S-scheme charge carrier transport mechanism, which is supported by Density Functional Theory simulations of work function and electron density difference, along with in-situ irradiated X-ray Photoelectron Spectroscopy and Electron Paramagnetic Resonance analyses. This S-scheme structure improves the interfacial carrier separation efficiency and retains the strong photo-redox ability. Our study demonstrates that construction of a S-scheme heterojunction is significant in the design and preparation of highly efficient photocatalysts for air purification.

Key words: BiOIO3, g-C3N4, S-scheme heterojunction, Photocatalysis, NOx removal