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

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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 °C 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.

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Authors and Affiliations

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

    Shijing Lin, Wutong Du, Laga Tong, Tao Ji & Xinxin Jiao

Authors
  1. Shijing Lin
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  2. Wutong Du
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  3. Laga Tong
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  4. Tao Ji
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  5. Xinxin Jiao
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Corresponding author

Correspondence to Shijing Lin.

Additional information

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).

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Lin, S., Du, W., Tong, L. et al. Photocatalytic Degradation of 4-Chlorophenol by Gd-Doped β-Bi2O3 Under Visible Light Irradiation. Chem. Res. Chin. Univ. 35, 120–124 (2019). https://doi.org/10.1007/s40242-018-8170-6

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  • DOI: https://doi.org/10.1007/s40242-018-8170-6

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