Citation: Chunyan Yang, Qiuyu Rong, Fengyin Shi, Menghan Cao, Guie Li, Yanjun Xin, Wen Zhang, Guangshan Zhang. Rationally designed S-scheme heterojunction of BiOCl/g-C₃N₄ for photodegradation of sulfamerazine: Mechanism insights, degradation pathways and DFT calculation[J]. Chinese Chemical Letters, ;2024, 35(12): 109767. doi: 10.1016/j.cclet.2024.109767 shu

Rationally designed S-scheme heterojunction of BiOCl/g-C₃N₄ for photodegradation of sulfamerazine: Mechanism insights, degradation pathways and DFT calculation

Chunyan Yang ^{a, b} ,
Qiuyu Rong ^a ,
Fengyin Shi ^a ,
Menghan Cao ^a ,
Guie Li ^a ,
Yanjun Xin ^a ,
Wen Zhang ^c ,
Guangshan Zhang ^{a, *,}

a.
Qingdao Engineering Research Center for Rural Environment, College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China
b.
College of Architecture and Environment, Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610207, China
c.
John A. Reif, sdJr. Department of Civil and Environmental Engineering, New Jersey Institute of Technology, Newark, NJ 07102, United States

gszhang@qau.edu.cn

Received Date: 2 December 2023
Revised Date: 26 February 2024
Accepted Date: 12 March 2024
Available Online: 13 March 2024

Figures(9)

Antibiotics present in surface water have detrimental effects on both human health and the ecosystem. Additionally, they pose a threat to the effectiveness of biological water treatment processes. In this study, a visible photocatalytic system with BiOCl/g-C₃N₄ heterojunction was developed to remove sulfonamide antibiotic sulfamerazine (SMZ) in water. The removal rate reached 92.77% under visible light irradiation for 80 min. This photocatalyst remained active after 5 cycles of experiments and maintained a relatively stable removal rate of SMZ of over 80%. The ESR tests indicate that the main active species in this photocatalytic system were h⁺ and ^•O₂⁻. The enhanced photocatalytic efficiency was mainly ascribed to the formation of a built-in electric field between BiOCl and g-C₃N₄ through the carrier transport mechanism of the S-scheme heterojunction. This heterojunction facilitated the photogenerated carrier shift and segregation, and improved the interfacial charge transfer efficiency, as confirmed by photoelectrochemical test and Density functional theory (DFT) calculations. The HPLC-QTOF-MS/MS and DFT analysis revealed possible degradation pathways of SMZ may involve deamination, hydroxylation, SO₂ extrusion and bond breaking. This novel BiOCl/g-C₃N₄ heterojunction has proven to be essential for efficient visible-light photocatalysis.
- BiOCl/g-C₃N₄,
- Visible-light,
- DFT,
- Sulfamerazine,
- Degradation pathways
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Rationally designed S-scheme heterojunction of BiOCl/g-C3N4 for photodegradation of sulfamerazine: Mechanism insights, degradation pathways and DFT calculation

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通讯作者: 陈斌, bchen63@163.com

Rationally designed S-scheme heterojunction of BiOCl/g-C₃N₄ for photodegradation of sulfamerazine: Mechanism insights, degradation pathways and DFT calculation