Journal
JOURNAL OF CATALYSIS
Volume 358, Issue -, Pages 211-223Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2017.12.005
Keywords
Levofloxacin; Ag2CO3/CeO2/AgBr; Degradation pathway; Photocatalysis; Ternary composites
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Funding
- National Natural Science Foundation of China [51541801, 51521006]
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Construction of highly efficient ternary photocatalytic systems is strongly attracting the attention of researchers. In this study, a novel ternary Ag2CO3/CeO2/AgBr photocatalyst with a double Z-scheme configuration was fabricated by in situ loading of Ag2CO3 onto CeO2 spindles and subsequently via an acid corrosion process. The ternary Ag2CO3/CeO2/AgBr composites exhibited enhanced photocatalytic activity for the photodegradation of levofloxacin (LVF) under visible light irradiation. Three-dimensional excitation-emission matrix fluorescence spectra revealed that the structure of LVF could be destroyed from the fluorescence point of view; liquid chromatograph-mass spectrometer tests indicated that LVF can be degraded via different pathways; a total organic carbon study showed that LVF could be effectively mineralized. Transient photocurrent response, photoluminescence, and electrochemical impedance spectroscopy indicated that ternary Ag2CO3/CeO2/AgBr composites had fast photoinduced charge separation efficiency. Active-species-trapping experiments and an electron spin resonance technique confirmed that h(+), O-center dot(2)-, and (OH)-O-center dot all participated in a photodegradation process. On the basic of various performance characterization and experimental results, a double Z-scheme photocatalytic mechanism was proposed. It is expected that the ternary Ag2CO3/CeO2/AgBr composites can be used as a promising photocatalyst for energy conversion and environmental remediation. This work could provide a new approach to constructing ternary hybrid photocatalysts and a comprehensive understanding of the degradation pathways for LVF. (C) 2017 Elsevier Inc. All rights reserved.
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