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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

Front. Chem. Sci. Eng.    2023, Vol. 17 Issue (11) : 1728-1740    https://doi.org/10.1007/s11705-023-2322-z
RESEARCH ARTICLE
ZnFe2O4/BiVO4 Z-scheme heterojunction for efficient visible-light photocatalytic degradation of ciprofloxacin
Beibei Wang1, Kejiang Qian2, Weiping Yang1, Wenjing An1, Lan-Lan Lou2(), Shuangxi Liu2, Kai Yu1()
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
2. Institute of New Catalytic Materials Science, School of Materials Science and Engineering, National Institute of Advanced Materials, Nankai University, Tianjin 300350, China
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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.

Keywords ZnFe2O4/BiVO4      Z-scheme heterojunction      photocatalytic degradation      ciprofloxacin     
Corresponding Author(s): Lan-Lan Lou,Kai Yu   
About author:

Peng Lei and Charity Ngina Mwangi contributed equally to this work.

Just Accepted Date: 15 May 2023   Online First Date: 28 June 2023    Issue Date: 25 October 2023
 Cite this article:   
Beibei Wang,Kejiang Qian,Weiping Yang, et al. ZnFe2O4/BiVO4 Z-scheme heterojunction for efficient visible-light photocatalytic degradation of ciprofloxacin[J]. Front. Chem. Sci. Eng., 2023, 17(11): 1728-1740.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-023-2322-z
https://academic.hep.com.cn/fcse/EN/Y2023/V17/I11/1728
Fig.1  XRD patterns of BiVO4, ZnFe2O4 and ZFO/BVO composites.
Fig.2  (a) TEM and HRTEM images of BiVO4; (b–c) TEM images of 30% ZFO/BVO with the inserted particle size distribution diagram of ZnFe2O4; and (d) HRTEM image and (e) EDS elemental mapping of 30% ZFO/BVO.
Fig.3  (a) DR UV–vis spectra with the inserted plots of (αhν)2 vs. of the samples; and (b) N2 adsorption–desorption isotherms and BET specific surface areas of the samples.
Fig.4  (a) The survey XPS spectra of the samples; and high-resolution XPS spectra in (b) Fe 2p, (c) Zn 2p, (d) Bi 4f, (e) V 2p and (f) O 1s regions of the samples.
Fig.5  (a) The degradation efficiencies, (b) pseudo-first order kinetic fitting results, and (c) the removal rates of TOC in photodegradation of CIP solution under visible light irradiation (λ > 420 nm); and (d) the cycling test for the photocatalytic degradation of CIP over 30% ZFO/BVO.
Fig.6  (a) Photocurrent responses and (b) EIS Nyquist plots of samples; (c) EIS spectra tested in the dark and under light illumination and (d) PL spectra of ZnFe2O4, BiVO4 and 30% ZFO/BVO; and Mott–Schottky curves of (e) ZnFe2O4 and (f) BiVO4 at different frequencies.
Fig.7  (a) Trapping experiments of active species during the CIP degradation over 30% ZFO/BVO under visible light irradiation; and (b) schematic diagram of possible photocatalytic mechanism in the photodegradation of CIP by 30% ZFO/BVO.
Fig.8  (a) Photocatalytic degradation pathways of CIP over 30% ZFO/BVO; and (b) Daphnia magna LC50, (c) mutagenicity situation, and (d) bioaccumulation factor of CIP and its degradation intermediates based on QSAR analysis.
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