Regulation of charge transfer in ZnO/Bi2Sn2O7 heterojunction for enhanced photocatalytic performance towards antibiotic degradation

•ZnO/Bi2Sn2O7 heterojunction changed charge transfer mechanism from type II into Z-scheme by Schottky junction and SPR effect of the loaded Ag nanoparticles.•The migration behavior and photocatalytic mechanism with different heterostructures were comparatively studied.•Ag@ZnO/Bi2Sn2O7 photocatalyst...

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Veröffentlicht in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 2022-12, Vol.433, p.114142, Article 114142
Hauptverfasser: Wu, Chenyan, Shen, Qianhong, Liu, Jie, Jiang, Libei, Sheng, Jiansong, Li, Yue, Yang, Hui
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Sprache:eng
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Zusammenfassung:•ZnO/Bi2Sn2O7 heterojunction changed charge transfer mechanism from type II into Z-scheme by Schottky junction and SPR effect of the loaded Ag nanoparticles.•The migration behavior and photocatalytic mechanism with different heterostructures were comparatively studied.•Ag@ZnO/Bi2Sn2O7 photocatalyst with superior redox capacity exibited excellent mineralization ability. Regulating the migration behavior of photo-generated carriers is an effective strategy to design high-performance photocatalysts. Herein, ZnO/Bi2Sn2O7 type II heterojunction was fabricated through the composite of wide-bandgap ZnO and narrow-bandgap Bi2Sn2O7, and the charge transfer mechanism was changed from type II into Z-scheme by photo-depositing Ag nanoparticles on ZnO/Bi2Sn2O7 composite. The loaded Ag nanoparticles not only expanded absorption of ZnO to visible-light range through surface plasmon resonance effect, but also were served as bridge for photo-generated carriers, thereby changing transfer behavior of charge carriers in ZnO/Bi2Sn2O7 composite system. Compared with ZnO/Bi2Sn2O7 type II heterojunction, Ag@ZnO/Bi2Sn2O7 Z-Scheme heterostructure promoted separation efficiency of photo-generated carriers, and the average carrier lifetime was increased by 2.0 times. The mineralization rate of ciprofloxacin by Ag@ZnO/Bi2Sn2O7 composite was 2.6 times higher than that of ZnO/Bi2Sn2O7 composite, which reached 16.9 times that of pure Bi2Sn2O7 photocatalyst, exhibiting stronger redox ability.
ISSN:1010-6030
1873-2666
DOI:10.1016/j.jphotochem.2022.114142