Citation: Yanjuan Sun, Jiazhen Liao, Fan Dong, Sujuan Wu, Lidong Sun. A Bi/BiOI/(BiO)₂CO₃ heterostructure for enhanced photocatalytic NO removal under visible light[J]. Chinese Journal of Catalysis, ;2019, 40(3): 362-370. doi: 10.1016/S1872-2067(18)63187-0 shu

A Bi/BiOI/(BiO)₂CO₃ heterostructure for enhanced photocatalytic NO removal under visible light

Yanjuan Sun ^a,b, ,
Jiazhen Liao ^b ,
Fan Dong ^b,c ,
Sujuan Wu ^a ,
Lidong Sun ^a

a State Key Laboratory of Mechanical Transmission, School of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
b Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China;
c Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, Sichuan, China

Received Date: 7 August 2018
Revised Date: 9 October 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (21501016, 21777011, 51871037, 51501024), the Innovative Research Team of Chongqing (CXTDG201602014), the Key Natural Science Foundation of Chongqing (cstc2017jcyjBX0052) and the Plan for "National Youth Talents" of the Organization Department of the Central Committee. The authors also acknowledge the AM-HPC in Suzhou, China for computational support.

Narrow-band BiOI photocatalysts usually suffer from low photocatalysis efficiency under visible light exposure because of rapid charge recombination. In this work, to overcome this deficiency of photosensitive BiOI, oxygen vacancies, Bi particles, and Bi₂O₂CO₃ were co-induced in BiOI via a facile in situ assembly method at room temperature using NaBH₄ as the reducing agent. In the synthesized ternary Bi/BiOI/(BiO)₂CO₃, the oxygen vacancies, dual heterojunctions (i.e., Bi/BiOI and BiOI/(BiO)₂CO₃), and surface plasmon resonance effect of the Bi particles contributed to efficient electron-hole separation and an increase in charge carrier concentration, thus boosting the overall visible light photocatalysis efficiency. The as-prepared catalysts were applied for the removal of NO in concentrations of parts per billion from air in continuous air flow under visible light illumination. Bi/BiOI/(BiO)₂CO₃ exhibited a highly enhanced NO removal ratio of 50.7%, much higher than that of the pristine BiOI (1.2%). Density functional theory calculations and experimental results revealed that the Bi/BiOI/(BiO)₂CO₃ composites promoted the production of reactive oxygen species for photocatalytic NO oxidation. Thus, this work provides a new strategy to modify narrow-band semiconductors and explore other bismuth-containing heterostructured visible-light-driven photocatalysts.
- BiOI,
- Oxygen vacancy,
- Heterojunction,
- Surface plasmon resonance effect,
- NO oxidation
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A Bi/BiOI/(BiO)₂CO₃ heterostructure for enhanced photocatalytic NO removal under visible light