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A novel Ag3BiO3/ZnO/BC composite with abundant defects and utilizing hemp BC as charge transfer mediator for photocatalytic degradation of levofloxacin

[Display omitted] •A novel n-n heterojunction Ag3BiO3/ZnO/BC is successfully constructed.•The Ag3BiO3/ZnO/BC has abundant defects and strong light response.•The optimal 0.2-Ag3BiO3/ZnO/BC possesses superior levofloxacin removal rate reaching 95.8%.•The Ag3BiO3/ZnO/BC shows desirable stability and re...

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Bibliographic Details
Published in:Applied surface science 2023-05, Vol.619, p.156732, Article 156732
Main Authors: Dong, Guohua, Chi, Weimeng, Chai, Dong-feng, Zhang, Zhuanfang, Li, Jinlong, Zhao, Ming, Zhang, Wenzhi, Lv, Jun, Chen, Shijie
Format: Article
Language:English
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Summary:[Display omitted] •A novel n-n heterojunction Ag3BiO3/ZnO/BC is successfully constructed.•The Ag3BiO3/ZnO/BC has abundant defects and strong light response.•The optimal 0.2-Ag3BiO3/ZnO/BC possesses superior levofloxacin removal rate reaching 95.8%.•The Ag3BiO3/ZnO/BC shows desirable stability and reusability. In this work, a novel n-n heterojunction Ag3BiO3/ZnO/BC with abundant defects was prepared via a facile hydrothermal strategy and applied for photocatalytic degradation levofloxacin (LFX) antibiotics. After optimization on the composition of ZnO, biochar (BC) and Ag3BiO3, the optimal 0.2-Ag3BiO3/ZnO/BC shows superior photocatalytic activity, yielding a higher removal efficiency of LFX ∼ 95.8 % in 120 min than those of pure ZnO (9.4 %), BC (32.1 %) and Ag3BiO3 (14.3 %). Additionally, 0.2-Ag3BiO3/ZnO/BC also shows prominent stability and reusability for running 5 times. The superior photocatalytic properties can be associated with the abundant defects, stronger light absorption and matched bandgap energy levels of the 0.2-Ag3BiO3/ZnO/BC. Furthermore, the formed n-n type heterojunction between ZnO and Ag3BiO3 in Ag3BiO3/ZnO/BC can efficiently promote the separation and transfer of the photogenerated electron/hole (e-/h+) pairs and indirectly decrease the charges recombination. Meanwhile, the BC with excellent conductivity can act as a charge transfer bridge for further accelerating the charges transfer between ZnO and Ag3BiO3. The possible degradation pathway of LFX was presumably proposed by conducting the liquid chromatography-mass spectrometry (LC-MS) measurement. In conclusion, this work offers a novel strategy for designing and fabricating ZnO based n-n type heterojunction photocatalysts coupled with biochar for efficiently eliminating antibiotics in aqueous.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2023.156732