Citation: Hongjing Liu, Peng Chen, Xiaoya Yuan, Yuxin Zhang, Hongwei Huang, Li'ao Wang, Fan Dong. Pivotal roles of artificial oxygen vacancies in enhancing photocatalytic activity and selectivity on Bi₂O₂CO₃ nanosheets[J]. Chinese Journal of Catalysis, ;2019, 40(5): 620-630. doi: S1872-2067(19)63279-1 shu

Pivotal roles of artificial oxygen vacancies in enhancing photocatalytic activity and selectivity on Bi₂O₂CO₃ nanosheets

a State Kay Laboratory of Coal Mine Disaster Dynamics and Control, College of Resource and Environmental Science, Chongqing University, Chongqing 400044, China;
b Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, Sichuan, China;
c Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China;
d College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China;
e State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
f National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China

Received Date: 12 December 2018
Revised Date: 14 December 2018

Fund Project: This work was supported by the National Key R&

There is an increasing interest in bismuth carbonate (Bi₂O₂CO₃, BOC) as a semiconductor photocatalyst. However, pure BOC strongly absorbs ultraviolet light, which drives a high recombination rate of charge carriers and thereby limits the overall photocatalysis efficiency. In this work, artificial oxygen vacancies (OV) were introduced into BOC (OV-BOC) to broaden the optical absorption range, increase the charge separation efficiency, and activate the reactants. The photocatalytic removal ratio of NO was increased significantly from 10.0% for pure BOC to 50.2% for OV-BOC because of the multiple roles played by the oxygen vacancies. These results imply that oxygen vacancies can facilitate the electron exchange between intermediates and the surface oxygen vacancies in OV-BOC, making them more easily destroyed by active radicals. In situ DRIFTS spectra in combination with electron spin resonance spectra and density functional theory calculations enabled unraveling of the conversion pathway for the photocatalytic NO oxidation on OV-BOC. It was found that oxygen vacancies could increase the production of active radicals and promote the transformation of NO into target products instead of toxic byproducts (NO₂), thus the selectivity is significantly enhanced. This work provides a new strategy for enhancing photocatalytic activity and selectivity.
- Bismuth carbonate,
- Oxygen vacancy,
- Visible light photocatalysis,
- Reactant activation,
- Photocatalysis mechanism
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Pivotal roles of artificial oxygen vacancies in enhancing photocatalytic activity and selectivity on Bi₂O₂CO₃ nanosheets