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

doi:10.1016/S1872-2067(19)63279-1

Chinese Journal of Catalysis ›› 2019, Vol. 40 ›› Issue (5): 620-630.DOI: 10.1016/S1872-2067(19)63279-1

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

Hongjing Liu^a, Peng Chen^c, Xiaoya Yuan^d, Yuxin Zhang^e, Hongwei Huang^f, Li'ao Wang^a, Fan Dong^b

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:2018-12-12 Revised:2018-12-14 Online:2019-05-18 Published:2019-03-30
Contact: S1872-2067(19)63279-1
Supported by:
This work was supported by the National Key R&D Program of China (2016YFC02047), the National Natural Science Foundation of China (21822601, 21777011, and 21501016), the Graduate Research and Innovation Foundation of Chongqing (CYS18019), the Innovative Research Team of Chongqing (CXTDG201602014), the Natural Science Foundation of Chongqing (cstc2017jcyjBX0052), and the National Special Supporting National Plan for High-Level. The authors also acknowledge the AM-HPC in Suzhou, China for computational support.

Abstract

Abstract:

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.

Key words: Bismuth carbonate, Oxygen vacancy, Visible light photocatalysis, Reactant activation, Photocatalysis mechanism

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.

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

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