Citation: Liao Jiazhen, Li Kanglu, Ma Hao, Dong Fan, Zeng Xiaolan, Sun Yanjuan. Oxygen vacancies on the BiOCl surface promoted photocatalytic complete NO oxidation via superoxide radicals[J]. Chinese Chemical Letters, ;2020, 31(10): 2737-2741. doi: 10.1016/j.cclet.2020.03.081 shu

Oxygen vacancies on the BiOCl surface promoted photocatalytic complete NO oxidation via superoxide radicals

Liao Jiazhen ^a ,
Li Kanglu ^b,c ,
Ma Hao ^a ,
Dong Fan ^b ,
Zeng Xiaolan ^a,*, ,
Sun Yanjuan ^b,*,

a.
College of Environment and Ecology, Chongqing University, Chongqing 400040, China
b.
Institute of Fundamental and Frontier Sciences, School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 611731, China
c.
College of Architecture and Environment, Sichuan University, Chengdu 610065, China

276686704@qq.com

syhsyj@163.com

Received Date: 17 February 2020
Revised Date: 20 March 2020
Accepted Date: 31 March 2020
Available Online: 27 April 2020

Figures(6)

One of the core issues in the photocatalytic oxidation of nitric oxide is the effective conversion of NO into the final product (nitrate). More than just improving the visible light photocatalytic performance of BiOCl, we aim to inhibit the generation of toxic by-product NO₂ during this process. In this study, we demonstrate that the oxygen vacancies (OVs) modulate its surface photogenerated carrier transfer to inflect the NO conversion pathway by a facile mixed solvent method to induce OVs on the surface of BiOCl. The photocatalytic NO removal efficiency under visible light increased from 5.6% to 36.4%. In addition, the production rate of NO₂ is effectively controlled. The effects of OVs on the generation of reactive oxygen species, electronic transfer, optical properties, and photocatalytic NO oxidation are investigated by combining density functional theory (DFT) theoretical calculations, the in situ FTIR spectra and experimental characterization. The OVs on the surface of BiOCl speed the trapping and transfer of localized electrons to activate the O₂, producing O₂^·-, which avoid NO₂ formation, resulting in complete oxidation of NO (NO + O₂^·- → NO₃^-). These findings can serve as the basis for controlling and blocking the generation of highly toxic intermediates through regulating the reactive species during the NO oxidation. It also can help us to understand the role of OV on the BiOCl surface and application of photocatalytic technology for safe air purification.
- Oxygen vacancies,
- BiOCl,
- Visible light NO oxidation,
- Toxic byproduct,
- Reactive oxygen species
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