Journal
APPLIED SURFACE SCIENCE
Volume 440, Issue -, Pages 99-106Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2017.12.219
Keywords
Visible light photocatalysis; Z-scheme; Photocatalytic stability; ZnFe2O4/AgBr/Ag; Magnetic recovery
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Funding
- National Natural Science Foundation of China [51571123, 51671108]
- Tianjin Natural Science Foundation [17JCZDJC37000]
- National Basic Research Program of China (973 Program) [2014CB931703]
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High efficiency, high stability and easy recovery are three key factors for practical photocatalysts. Z-scheme heterostructure is one of the most promising photocatalytic systems to meet all above requirements. However, efficient Z-scheme photocatalysts which could absorb visible light are still few and difficult to implement at present. In this work, the composite photocatalysts ZnFe2O4/AgBr/Ag were prepared through a two-step method. A similar to 92% photodegradation rate on methyl orange was observed within 30 min under visible light, which is much better than that of individual ZnFe2O4 or AgBr/Ag. The stability was also greatly improved compared with AgBr/Ag. The increased performance is resulted from the suitable band alignment of ZnFe2O4 and AgBr, and it is defined as Z-scheme mechanism which was demonstrated by detecting active species and electrochemical impedance spectroscopy. Besides, ZnFe2O4/AgBr/Ag is ferromagnetic and can be recycled by magnet. These results show that ZnFe2O4/AgBr/Ag is a potential magnetically recyclable photocatalyst which can be driven by visible light. (C) 2017 Elsevier B.V. All rights reserved.
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