Highly efficient visible-light driven AgBr/Ag3PO4 hybrid photocatalysts with enhanced photocatalytic activity |
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| Affiliation: | 1. Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu 514-8507, Mie, Japan;2. Environmental Preservation Center, Mie University, Tsu 514-8507, Mie, Japan;1. Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, PR China;2. Mathematics and Physics Centre, Xi’an Jiaotong-Liverpool University, Suzhou 215123, PR China;1. Guangdong Provincial Key Laboratory on Functional Soft Condensed Matter, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China;2. Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843-3122, USA;1. CDMF, Federal University of São Carlos, P.O. Box 676, São Carlos 13565-905, Brazil;2. Institute of Chemistry, State University of Campinas, Unicamp, 13083-970, Campinas, SP, Brazil;3. Modeling and Molecular Simulations Group, São Paulo State University, UNESP, Bauru, SP, Brazil;4. Helmholtz-Zentrum-Berlin, Berlin, 14109, Germany;5. UFCat, Federal University of Catalão, SetorUniversitário, 75704-020 Catalão, Brazil;6. IFSC, University of São Paulo, P.O. Box 369, 13560-970 São Carlos, Brazil;7. Departament of Analytical and Physical Chemistry, University Jaume I, Castelló 12071, Spain;1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum Beijing, No. 18 Fuxue Rd., Beijing 102249, PR China;2. Department of Materials Science and Engineering, College of Science, China University of Petroleum Beijing, No. 18 Fuxue Rd., Beijing 102249, PR China |
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| Abstract: | Highly efficient visible-light-driven AgBr/Ag3PO4 hybrid photocatalysts with different mole ratios of AgBr were prepared via an in-situ anion-exchange method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV–vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) technique. Under visible light irradiation (>420 nm), the AgBr/Ag3PO4 photocatalysts displayed the higher photocatalytic activity than pure Ag3PO4 and AgBr for the decolorization of acid orange 7 (AO 7). Among the hybrid photocatalysts, AgBr/Ag3PO4 with 60% of AgBr exhibited the highest photocatalytic activity for the decolorization of AO 7. X-ray photoelectron spectroscopy (XPS) results revealed that AgBr/Ag3PO4 readily transformed to be Ag@AgBr/Ag3PO4 system while the photocatalytic activity of AgBr/Ag3PO4 remained after 5 recycling runs. In addition, the quenching effects of different scavengers displayed that the reactive h+ and O2?? play the major role in the AO 7 decolorization. The photocatalytic activity enhancement of AgBr/Ag3PO4 hybrids can be ascribed to the efficient separation of electron–hole pairs through a Z-scheme system composed of Ag3PO4, Ag and AgBr, in which Ag nanoparticles act as the charge separation center. |
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| Keywords: | AgBr Hybrid photocatalyst Reaction mechanism Visible light |
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