Citation: Ya-Wen ZHAO, Jun-Ke ZHANG, Cai-Xia FENG, Jia-Peng XU, Rui DU, Hua HU, Yan-Mei ZHOU, Shan-Hu LIU, Yan-Hong LIU. Enhancement of Visible-Light Catalytic Activity for Zn Doped OV-β-Bi₂O₃: Regulation of Electronic Structure and Promotion of Charge Separation[J]. Chinese Journal of Inorganic Chemistry, ;2021, 37(3): 541-554. doi: 10.11862/CJIC.2021.064 shu

Enhancement of Visible-Light Catalytic Activity for Zn Doped OV-β-Bi₂O₃: Regulation of Electronic Structure and Promotion of Charge Separation

Ya-Wen ZHAO ¹ ,
Jun-Ke ZHANG ¹ ,
Cai-Xia FENG ^1,, ,
Jia-Peng XU ¹ ,
Rui DU ¹ ,
Hua HU ² ,
Yan-Mei ZHOU ^1,, ,
Shan-Hu LIU ¹ ,
Yan-Hong LIU ³

1.
Henan Province International Joint Laboratory for Environmental Pollution Control Materials, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, China
2.
Henan Province Kaifeng Ecological Environment Monitoring Center, Kaifeng, Henan 475003, China
3.
Technical Institute of Physics and Chemistry, Chinese Academy of Science, Beijing 100190, China

Corresponding author: Cai-Xia FENG, caixia8079@henu.edu.cn Yan-Mei ZHOU, zhouym@henu.edu.cn
Received Date: 10 September 2020
Revised Date: 5 January 2021

Figures(14)

A novel Zn-doped β-Bi₂O₃ nanomaterial (OV-Zn: Bi₂O₃) with two crystal defects, oxygen vacancy (OV) and doped Zn²⁺, was prepared via a sol-gel method followed by in-situ carbon thermal reduction treatment. The concentration of OV of OV-Zn: Bi₂O₃ sample can be modulated by regulating the content of doped Zn²⁺. As a reference, the novel β-Bi₂O₃ having OV but without doped Zn²⁺ (OV-β-Bi₂O₃) was also synthesized via a similar process. The comprehensive effect of OV and doped Zn²⁺ on the visible-light-activity of OV-Zn: Bi₂O₃ for the degradation of methylene blue (MB) and 2, 4, 6-trichlorophenol (2, 4, 6-TCP) was investigated by ultraviolet-visible light diffuse reflectance spectra, X-ray photoelectron spectra, electron spin resonance, photoluminescence spectrum and photoelectrochemical measurements. The results show that introduction of OV can not only drastically extend the photoabsorption into longer wavelength region but also promote the separation of photo-generated charge carriers. So, compared to traditional β-Bi₂O₃, OV-β-Bi₂O₃ demonstrated highly promoted activity for the degradation of methylene blue (MB) and 2, 4, 6-trichlorophenol (2, 4, 6-TCP). For OV-Zn: Bi₂O₃ catalysts, Znic doping can make the valence band edge of catalysts move down and the oxidation ability of photo-excited holes increase. And appropriate amount of zinc doping can also improve the separation efficiency of photogenerated carriers. In contrast to OV-β-Bi₂O₃, the visible light activity of OV-Zn: Bi₂O₃ was further improved and OV-Zn: Bi₂O₃-0.3 with a molar ratio (n_Zn/n_Bi) of 0.3 exhibited the highest activity for the degradation of MB and 2, 4, 6-TCP.
- oxygen vacancy,
- Zn²⁺ doping,
- photocatalysis,
- charge separation,
- visible light activity
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Enhancement of Visible-Light Catalytic Activity for Zn Doped OV-β-Bi2O3: Regulation of Electronic Structure and Promotion of Charge Separation

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通讯作者: 陈斌, bchen63@163.com

Enhancement of Visible-Light Catalytic Activity for Zn Doped OV-β-Bi₂O₃: Regulation of Electronic Structure and Promotion of Charge Separation