Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (9): 1519-1529.DOI: 10.1016/S1872-2067(20)63765-2

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Novel S-scheme 2D/2D BiOBr/g-C3N4 heterojunctions with enhanced photocatalytic activity

Bin Zhanga, Xiaoyun Hub, Enzhou Liua,#(), Jun Fana,*()   

  1. aXi’an Key Laboratory of Special Energy Materials, School of Chemical Engineering, Northwest University, Xi’an 710069, Shaanxi, China
    bSchool of Physics, Northwest University, Xi’an 710127, Shaanxi, China
  • Received:2020-11-23 Accepted:2021-01-18 Online:2021-09-18 Published:2021-05-16
  • Contact: Enzhou Liu,Jun Fan
  • About author:# Tel: +86-13759963944; E-mail: liuenzhou@nwu.edu.cn
    * Tel: +86-13110493201; E-mail: fanjun@nwu.edu.cn;
  • Supported by:
    National Natural Science Foundation of China(21676213);National Natural Science Foundation of China(11974276);National Natural Science Foundation of China(22078261);Natural Science Basic Research Program of Shaanxi(2020JM-422);China Postdoctoral Science Foundation(2016M600809)

Abstract:

The design and construction of heterojunction photocatalysts, which possess a staggered energy band structure and appropriate interfacial contact, is an effective way to achieve outstanding photocatalytic performance. In this study, 2D/2D BiOBr/g-C3N4 heterojunctions were successfully obtained by a convenient in situ self-assembly route. Under simulated sunlight irradiation, 99% of RhB (10 mg·L-1, 100 mL) was efficiently degraded by 1.5-BiOBr/g-C3N4 within 30 min, which is better than the performance of both BiOBr and g-C3N4, and it has superior stability. In addition, the composite also exhibits enhanced photocatalytic activity for H2 production. The enhanced activity can be attributed to the intimate interface contact, the larger surface area, and the highly efficient separation of photoinduced electron-hole pairs. Based on the experimental results, a novel S-scheme model was proposed to illuminate the transfer process of charge carriers. This study presents a simple way to develop novel step-scheme photocatalysts for environmental and related applications.

Key words: BiOBr/g-C3N4, 2D/2D, Photocatalytic RhB degradation, H2 evolution, S-scheme heterojunction