Citation: Kai-Xuan XU, Yu-Long KANG, Hong-Bin HE, Xiao-Ming GAO, Chen-Yu ZHAO, Rui-Yang REN. Nitrogen-vacancies g-C₃N₅ modified S-doping perylene diimide for the enhanced visible photo self-Fenton reaction for phenol oxidation coupled with Cr(Ⅵ) reduction[J]. Chinese Journal of Inorganic Chemistry, ;2023, 39(1): 32-44. doi: 10.11862/CJIC.2022.264 shu

Nitrogen-vacancies g-C₃N₅ modified S-doping perylene diimide for the enhanced visible photo self-Fenton reaction for phenol oxidation coupled with Cr(Ⅵ) reduction

Department of Chemistry and Chemical Engineering, Clean Utilization of Low-Rank Coal of Shaanxi Collaborative Innovation Center, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan'an University, Yan'an, Shaanxi 716000, China

Corresponding author: Xiao-Ming GAO, ydgaoxm@126.com
Received Date: 31 May 2022
Revised Date: 5 October 2022

Figures(11)

Nitrogen-vacancies g-C₃N₅ (NVs) modified S-doping perylene diimide (S-PDI) organic compound semiconductor was prepared by electrostatic self-assembly. The nitrogen vacancies provided rich active sites on the surface of g-C₃N₅. The amide in the preparation of S-PDI enhanced the intermolecular interaction between S-PDI and NVs. The reduction rate of Cr(Ⅵ) over 30% NVs/S-PDI (with NVs mass fraction of 30%) was 79.96%, and the degradation rate of phenol was 74.40%. Furthermore, In the process of synergistic oxidation of phenol and reduction of Cr(Ⅵ) over 30% NVs/S-PDI, the reduction rate of Cr(Ⅵ) was 92.83%, and the degradation rate of phenol was 93.89%. Carboxylic acid and propanol, the products of oxidative degradation of phenol could be used as sacrificial agents of Cr(Ⅵ), which promoted the reduction of Cr(Ⅵ). The reduction of Cr(Ⅵ) enhanced the oxidative degradation of phenol. Accordingly, the carboxylic acid and propanol were finally oxidized to CO₂ and H₂O. Using the reduction performance of the conduction band and the oxidation performance of the valence band, the spatial separation of electrons and holes could be achieved by constructing heterojunction NVs/S-PDI, which could synergistically strengthen the oxidation half-reaction and reduction half-reaction in the photocatalytic process, simultaneously improve the photocatalytic oxidation-reduction performance. At the same time, under the illumination of visible light, H₂O₂ and Cr(Ⅵ)were generated in the phenol aqueous solution. A photo self-Fenton reaction process was formed by the electrons, H₂O₂ and Cr(Ⅵ), which further promoted the oxidative degradation of phenol and the reduction and removal of Cr(Ⅵ).
- nitrogen-vacancies g-C₃N₅,
- S-doping perylene diimide,
- photocatalysis,
- oxidation half-reaction,
- reduction half-reaction,
- photo self-Fenton reaction
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沈阳化工大学材料科学与工程学院沈阳 110142

Nitrogen-vacancies g-C3N5 modified S-doping perylene diimide for the enhanced visible photo self-Fenton reaction for phenol oxidation coupled with Cr(Ⅵ) reduction

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通讯作者: 陈斌, bchen63@163.com

Nitrogen-vacancies g-C₃N₅ modified S-doping perylene diimide for the enhanced visible photo self-Fenton reaction for phenol oxidation coupled with Cr(Ⅵ) reduction