Citation: Wendong Zhang, Xiaoli Liu, Xing'an Dong, Fan Dong, Yuxin Zhang. Facile synthesis of Bi₁₂O₁₇Br₂ and Bi₄O₅Br₂ nanosheets: In situ DRIFTS investigation of photocatalytic NO oxidation conversion pathway[J]. Chinese Journal of Catalysis, ;2017, 38(12): 2030-2038. doi: 10.1016/S1872-2067(17)62941-3 shu

Facile synthesis of Bi₁₂O₁₇Br₂ and Bi₄O₅Br₂ nanosheets: In situ DRIFTS investigation of photocatalytic NO oxidation conversion pathway

a College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
b Department of Scientific Research Management, Chongqing Normal University, Chongqing 401331, China;
c Chongqing Key Laboratory of Catalysis and Functional Organic Molecules, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China

Received Date: 23 September 2017
Revised Date: 26 October 2017

Fund Project: This work is supported by the National Natural Science Foundation of China (51708078, 21576034), Chongqing Postdoctoral Science Foundation funded project (Xm2016027), the Innovative Research Team of Chongqing (CXTDG201602014, CXTDX201601016).

Bi₁₂O₁₇Br₂ and Bi₄O₅Br₂ visible-light driven photocatalysts, were respectively fabricated by hydrothermal and room-temperature deposition methods with the use of BiBr₃ and NaOH as precursors. Both Bi₁₂O₁₇Br₂ and Bi₄O₅Br₂ were composed of irregular nanosheets. The Bi₄O₅Br₂ nanosheets exhibited high and stable visible-light photocatalytic efficiency for ppb-level NO removal. The performance of Bi₄O₅Br₂ was markedly higher than that of the Bi₁₂O₁₇Br₂ nanosheets. The hydroxyl radical (·OH) was determined to be the main reactive oxygen species for the photo-degradation processes of both Bi₁₂O₁₇Br₂ and Bi₄O₅Br₂. However, in situ diffuse reflectance infrared Fourier transform spectroscopy analysis revealed that Bi₁₂O₁₇Br₂ and Bi₄O₅Br₂ featured different conversion pathways for visible light driven photocatalytic NO oxidation. The excellent photocatalytic activity of Bi₄O₅Br₂ resulted from a high surface area and large pore volumes, which facilitated the transport of reactants and intermediate products, and provided more active sites for photochemical reaction. Furthermore, the Bi₄O₅Br₂ nanosheets produced more ·OH and presented stronger valence band hole oxidation. In addition, the oxygen atoms of NO could insert into oxygen-vacancies of Bi₄O₅Br₂, which provided more active sites for the reaction. This work gives insight into the photocatalytic pollutant-degradation mechanism of bismuth oxyhalide.
- Bi₁₂O₁₇Br₂,
- Bi₄O₅Br₂,
- In situ diffuse reflectance infrared Fourier transform spectroscopy investigation,
- Conversion pathway,
- NO oxidation
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通讯作者: 陈斌, bchen63@163.com

Facile synthesis of Bi₁₂O₁₇Br₂ and Bi₄O₅Br₂ nanosheets: In situ DRIFTS investigation of photocatalytic NO oxidation conversion pathway