Photocatalytic Degradation of 4-Chlorophenol by Gd-Doped β-Bi2O3 Under Visible Light Irradiation

doi:10.1007/s40242-018-8170-6

Chemical Research in Chinese Universities ›› 2019, Vol. 35 ›› Issue (1): 120-124.doi: 10.1007/s40242-018-8170-6

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Photocatalytic Degradation of 4-Chlorophenol by Gd-Doped β-Bi₂O₃ Under Visible Light Irradiation

LIN Shijing, DU Wutong, TONG Laga, JI Tao, JIAO Xinxin

College of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, P. R. China

Received:2018-05-23 Revised:2018-11-01 Online:2019-02-01 Published:2018-11-26
Contact: LIN Shijing E-mail:linshijing@bipt.edu.cn
Supported by:
Supported by the General Project of Science and Technology Plan of Beijing Municipal Education Commission, China (Nos.SQKM201410017004, KM201710017001), the Natural Science Foundation of Beijing Municipality, China(No.2174072), the Outstanding Talents Training Program of Beijing Municipality, China(No.2016000020124G060) and the Municipal Undergraduates Research Training Program of Beijing Municipality, China(Nos.2016J00037, 2017J00138).

Abstract

Abstract: Chlorophenols are known as persistent organic pollutants. Therefore, research on the removal of chlorophenols has attracted widespread attention. Herein, the photocatalytic degradation of 4-chlorophenol by Gd-doped β-Bi₂O₃ under visible light irradiation was studied. The results showed that Gd-doped β-Bi₂O₃ materials are efficient catalysts for the photocatalytic degradation of chlorophenols, and 2% (atomic fraction) Gd-doped β-Bi₂O₃ exhibits the highest photocatalytic activity for 4-chlorophenol degradation, because doping an appropriate amount of Gd³⁺ ions can effectively reduce the recombination rate of the photogenerated e^-/h⁺ pairs and then enhance the photocatalytic performance. When the reaction was carried out at 25℃ for 6 h using the 2% Gd-doped β-Bi₂O₃ micro/nano materials of 200 mg and at air flow rate of 40 mL/min, the degradation rate of 4-chlorophenol reached 92.3%. Additionally, based on the analysis of the products, it was speculated that the dominant photocatalytic degradation mechanism of 4-chlorophenol by Gd-doped β-Bi₂O₃ under visible light irradiation is an oxidative process involving an attack by the hydroxyl radical.

Key words: Bi₂O₃, Doping, Photocatalysis, 4-Chlorophenol

LIN Shijing, DU Wutong, TONG Laga, JI Tao, JIAO Xinxin. Photocatalytic Degradation of 4-Chlorophenol by Gd-Doped β-Bi₂O₃ Under Visible Light Irradiation[J]. Chemical Research in Chinese Universities, 2019, 35(1): 120-124.

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Photocatalytic Degradation of 4-Chlorophenol by Gd-Doped β-Bi₂O₃ Under Visible Light Irradiation

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