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

doi:10.1016/S1872-2067(20)63765-2

Abstract

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

Bin Zhang, Xiaoyun Hu, Enzhou Liu, Jun Fan. Novel S-scheme 2D/2D BiOBr/g-C₃N₄ heterojunctions with enhanced photocatalytic activity[J]. Chinese Journal of Catalysis, 2021, 42(9): 1519-1529.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63765-2

https://www.cjcatal.com/EN/Y2021/V42/I9/1519

Figures/Tables 16

Fig. 1. XRD patterns of X-BiOBr/g-C3N4.

Fig. 2. SEM images of g-C3N4 (a,b), BiOBr (c,d), and 1.5-BiOBr/g-C3N4 (e, f).

Fig. 3. TEM (a) and HRTEM (b) images of 1.5-BiOBr/g-C3N4.

Fig. 4. (a) Survey XPS spectrum of 1.5-BiOBr/g-C3N4; high-resolution XPS spectra of C 1s (b), N 1s (c), Bi 4f (d), O 1s (e), and Br 3d (f).

Fig. 5. (a) UV-vis absorption spectra of all samples; (b) Tacu plots of BiOBr and g-C3N4.

Fig. 6. Nitrogen adsorption-desorption isotherms.

Fig. 7. Photocatalytic degradation curves (a) and rate constant (k) (b) of all samples.

Fig. 8. Photocatalytic H2 evolution performance (a) and H2 evolution rates (b) of all samples.

Fig. 9. Cycling tests of RhB photodegradation (a) and H2 evolution (b) on the 1.5-BiOBr/g-C3N4 composite; (c) XRD patterns of the sample before and after reaction.

Fig. 10. Photoluminescence spectra (a), transient photocurrent responses (b), and electrochemical impedance spectroscopy (c) results of g-C3N4, BiOBr, and 1.5-BiOBr/g-C3N4.

Fig. 11. VB-XPS (a) and Mott-Schottky (b) plots of as-prepared BiOBr and g-C3N4.

Fig. 12. RhB photodegradation tests of 1.5-BiOBr/g-C3N4 with various scavengers.

Fig. 13. (a) UV absorption spectra of NBT; (b) Fluorescence spectra of TAOH.

Fig. 14. Type-II charge separation route in BiOBr/g-C3N4 system.

Fig. 15. (a) Band-gap structure of BiOBr and g-C3N4; (b) Internal electric field and band edge bending at the interface of BiOBr/g-C3N4 after contact; (c) S-scheme mechanism of BiOBr/g-C3N4 under light irradiation.

Fig. 16. Scheme 1. Preparation processes of the photocatalysts.

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

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