Citation: Teng Wang, Jiachun Cao, Juan Li, Didi Li, Zhimin Ao. A novel photocatalytic mechanism of volatile organic compounds degradation on BaTiO₃ under visible light: Photo-electrons transfer from photocatalyst to pollutant[J]. Chinese Chemical Letters, ;2025, 36(3): 110078. doi: 10.1016/j.cclet.2024.110078 shu

A novel photocatalytic mechanism of volatile organic compounds degradation on BaTiO₃ under visible light: Photo-electrons transfer from photocatalyst to pollutant

Teng Wang ^{a, 1} ,
Jiachun Cao ^{a, b, 1} ,
Juan Li ^b ,
Didi Li ^a ,
Zhimin Ao ^{b, *,}

a.
Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, Institute of Environmental Health and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
b.
Advanced Interdisciplinary Institute of Environment and Ecology, Guangdong Provincial Key Laboratory of Wastewater Information Analysis and Early Warning, Beijing Normal University, Zhuhai 519087, China

zhimin.ao@bnu.edu.cn

Received Date: 5 January 2024
Revised Date: 17 April 2024
Accepted Date: 31 May 2024
Available Online: 1 June 2024

Figures(10)

Wide bandgap semiconductors are typically activated under ultraviolet (UV) light irradiation for volatile organic compounds (VOCs) degradation. However, our previous study discovered that certain VOCs can interact with some wide bandgap semiconductors, formatting an intermediate bandgap between the VOCs and the conduction band of wide bandgap semiconductor, thus inducing visible light activation of the system, and photo-generated electrons are excited by visible light and transferred from the VOCs to the conduction band of semiconductor. In this work, BaTiO₃, traditionally is not active under visible light irradiation, however showed degradation rates of 100% and 20% for styrene and toluene under visible light, respectively. Density functional theory (DFT) calculations indicate that the adsorption of styrene or toluene on the BaTiO₃ surface reduces its bandgap from 2.93 eV to 1.36 eV and 2.26 eV, respectively. The intermediate bandgap in this system is primarily formed by the valence band of BaTiO₃ and the VOCs, and indicating that photo-generated electrons directly transfer from BaTiO₃ to the VOCs under visible light, inducing degradation reactions of VOCs, i.e., this work discovered a new transfer pathway of photo-electrons direct from the valence band of BaTiO₃ to VOCs, while photo-electrons are from VOCs to the conductive band of wide-bandgap semiconductors in our previous work.
- Volatile organic compounds,
- Photocatalytic Degradation,
- Wide-bandgap semiconductors,
- Density functional theory,
- Degradation mechanism
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A novel photocatalytic mechanism of volatile organic compounds degradation on BaTiO3 under visible light: Photo-electrons transfer from photocatalyst to pollutant

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通讯作者: 陈斌, bchen63@163.com

A novel photocatalytic mechanism of volatile organic compounds degradation on BaTiO₃ under visible light: Photo-electrons transfer from photocatalyst to pollutant