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

doi:10.1016/S1872-2067(17)62941-3

Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (12): 2030-2038.DOI: 10.1016/S1872-2067(17)62941-3

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

Wendong Zhang^a,b, Xiaoli Liu^a, Xing'an Dong^c, Fan Dong^c, Yuxin Zhang^a

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:2017-09-23 Revised:2017-10-26 Online:2017-12-18 Published:2017-12-29
Supported by:
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).

Abstract

Abstract:

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.

Key words: Bi₁₂O₁₇Br₂, Bi₄O₅Br₂, In situ diffuse reflectance infrared Fourier transform spectroscopy investigation, Conversion pathway, NO oxidation

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.

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

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