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Enhanced carrier separation and photocatalytic degradation of oxytetracycline via S-scheme MIL-53(Fe)/FeOCl heterojunction composites with peroxydisulfate activation

Visible light-driven photocatalysis often struggles with fast recombination of photogenerated electron-hole pair and unsatisfactory degradation efficiency of hazardous micropollutants, such as antibiotics. Constructing an effective heterojunction can address these challenges. In this study, a novel...

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Bibliographic Details
Published in:Journal of environmental chemical engineering 2025-02, Vol.13 (1), p.115024, Article 115024
Main Authors: Dong, Wei, Du, Chunyan, Zhang, Yin, Cao, Jiao, Jiang, Jingyi, Zhou, Lu, Yu, Guanlong, Zou, Yulv, Peng, Huaiyuan, Yan, Rong, Yang, Yu
Format: Article
Language:English
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Summary:Visible light-driven photocatalysis often struggles with fast recombination of photogenerated electron-hole pair and unsatisfactory degradation efficiency of hazardous micropollutants, such as antibiotics. Constructing an effective heterojunction can address these challenges. In this study, a novel S-scheme MIL-53(Fe)/FeOCl heterojunction composite was synthesized using a hydrothermal method. Factors influencing oxytetracycline (OTC) removal and the underlying reaction mechanism were investigated. The MF-10 composite demonstrated a remarkable removal efficiency of 90 %, significantly higher than that of MIL-53(Fe), which was 54 %. Even after six cycles, the degradation efficiency only decreased by 8 %, and the composition of MF-10 remained unchanged, indicating excellent durability. The photocatalytic process involves crucial reactive species such as ·OH, SO4•–,O2•–, and h+. The heterojunction construction extends the absorption range of visible light, and the internal electric field enhances the separation of photogenerated electron-hole pairs while maintaining robust electron and hole activity. Additionally, photogenerated electrons facilitate the Fe(II)/Fe(III) cycling, resulting in the production of more reactive species for OTC degradation. This work introduces a novel approach to enhance the activity of photocatalysts and provides valuable insights into the design of peroxydisulfate activators. •FeOCl was incorporated into MIL-53(Fe) to construct S-scheme heterojunction.•Heterojunction interface formed an internal electric field.•Removal of OTC was enhanced by carrier separation and retention of strong redox capacity.•MIL-53(Fe)/FeOCl maintained structure stability with only 8 % efficiency loss after six cycles.
ISSN:2213-3437
DOI:10.1016/j.jece.2024.115024