Citation: Xudong Yang, Jun Duan, Xian Zhang, Hongyu Zhang, Xinlei Liu, Yueqi Feng, Maosheng Zheng. Heterojunction architecture of Nb₂O₅/g-C₃N₄ for enhancing photocatalytic activity to degrade organic pollutants and deactivate bacteria in water[J]. Chinese Chemical Letters, ;2022, 33(8): 3792-3796. doi: 10.1016/j.cclet.2021.11.031 shu

Heterojunction architecture of Nb₂O₅/g-C₃N₄ for enhancing photocatalytic activity to degrade organic pollutants and deactivate bacteria in water

Xudong Yang ^a ,
Jun Duan ^b ,
Xian Zhang ^a ,
Hongyu Zhang ^a ,
Xinlei Liu ^a ,
Yueqi Feng ^a ,
Maosheng Zheng ^{a, *,}

a.
The Key Laboratory of Resources and Environmental System Optimization, Ministry of Education, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China
b.
The Key Laboratory of Water and Sediment Science, Ministry of Education, College of Environment Science and Engineering, Peking University, Beijing 100871, China

maoshengzheng@ncepu.edu.cn

Received Date: 19 August 2021
Revised Date: 27 September 2021
Accepted Date: 7 November 2021
Available Online: 12 November 2021

Figures(5)

Water pollution has become a serious problem owing to the development of society. Photocatalysis is a promising approach to remove various pollutants in water, such as organic pollutants and antibiotic resistance bacteria. Meanwhile, the design of heterojunction between two semiconductors is an effective path to improve photocatalytic properties due to its potential in improving separation and transfer of photoinduced carriers. In this study, Nb₂O₅/g-C₃N₄ (NO/CN) composite materials were prepared through a one-step heating method. Characterizations confirmed successful preparation of NO/CN heterojunction structure and better optical properties than pure g-C₃N₄ and Nb₂O₅. NO/CN composite materials showed excellent photocatalytic efficiency for Escherichia coli (E. coli) inactivation (95%) compared with the pure Nb₂O₅ (10%) and g-C₃N₄ (77%). Meanwhile, NO/CN exhibited better organic pollutants removal (RhB for 94%, methyl orange (MO) for 15% and methylene blue (MB) for 87%) under visible light, which is likely owing to the heterojunction structure between g-C₃N₄ and Nb₂O₅ that leads to the good separation of photogenerated electron-hole pair. Free radical scavenging and electron spin resonance (ESR) experiments demonstrated that superoxide radicals (^•O₂⁻) and holes (h⁺) were the dominant radicals. Therefore, the NO/CN was proposed to be a promising material for effective disinfection and removal of organic contaminants in water treatment.
- Graphitic carbon nitride,
- Niobium pentoxide,
- Photocatalysis,
- Escherichia coli disinfection,
- Dyes removal
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Heterojunction architecture of Nb2O5/g-C3N4 for enhancing photocatalytic activity to degrade organic pollutants and deactivate bacteria in water

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通讯作者: 陈斌, bchen63@163.com

Heterojunction architecture of Nb₂O₅/g-C₃N₄ for enhancing photocatalytic activity to degrade organic pollutants and deactivate bacteria in water