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ZnFe2O4/BiVO4 Z-scheme heterojunction for efficient visible-light photocatalytic degradation of ciprofloxacin

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Abstract

A novel Z-scheme ZnFe2O4/BiVO4 heterojunction photocatalyst was successfully synthesized using a convenient solvothermal method and applied in the visible light photocatalytic degradation of ciprofloxacin, which is a typical antibiotic contaminant in wastewater. The heterostructure of as-synthesized catalysts was confirmed using X-ray diffraction, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy characterizations. Compared with the single-phase counterparts, ZnFe2O4/BiVO4 demonstrated considerably enhanced photogenerated charge separation efficiencies because of the Z-scheme transfer mechanism of electrons between the composite photocatalysts. Consequently, the 30% ZnFe2O4/BiVO4 catalyst afforded a degradation rate of up to 97% of 20 mg/L ciprofloxacin under 30 min of visible light irradiation with a total organic carbon removal rate of 50%, which is an excellent activity compared with ever reported BiVO4-based catalysts. In addition, the liquid chromatography-mass spectrometry and quantitative structure-activity relationships model analyses demonstrated that the toxicity of the intermediates was lower than that of the parent ciprofloxacin. Moreover, the as-synthesized ZnFe2O4/BiVO4 heterojunctions were quite stable and could be reused at least four times. This study thus provides a promising Z-scheme heterojunction photocatalyst for the efficient removal and detoxication of antibiotic pollutants from wastewater.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 22172081), the National Key Research and Development Program of China (Grant No. 2022YFC3901401), Special Funds for Science and Technology Innovation in Tianjin (Grant No. 21ZXCCSN00010), and the Fundamental Research Funds for the Central Universities.

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Authors and Affiliations

  1. MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Technology for Complex Transmedia Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China

    Beibei Wang, Weiping Yang, Wenjing An & Kai Yu

  2. Institute of New Catalytic Materials Science, School of Materials Science and Engineering, National Institute of Advanced Materials, Nankai University, Tianjin, 300350, China

    Kejiang Qian, Lan-Lan Lou & Shuangxi Liu

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  1. Beibei Wang
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  2. Kejiang Qian
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  3. Weiping Yang
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  4. Wenjing An
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  5. Lan-Lan Lou
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  6. Shuangxi Liu
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  7. Kai Yu
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Correspondence to Lan-Lan Lou or Kai Yu.

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Wang, B., Qian, K., Yang, W. et al. ZnFe2O4/BiVO4 Z-scheme heterojunction for efficient visible-light photocatalytic degradation of ciprofloxacin. Front. Chem. Sci. Eng. 17, 1728–1740 (2023). https://doi.org/10.1007/s11705-023-2322-z

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  • DOI: https://doi.org/10.1007/s11705-023-2322-z

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