Journal
APPLIED SURFACE SCIENCE
Volume 526, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.146760
Keywords
Bismuth oxybromide; Photocatalyst; Surface plasmon resonance; Nanosheet; Fe doping; Au deposition
Categories
Funding
- National Research Foundation of Korea (NRF) - Korea government (MIST) [2019R1A2C1002844, 2018H1D3A2000611]
- Basic Science Research Program through NRF - Ministry of Education [2018R1D1A1A09083897, 2016R1A6A1A03012877]
- National Natural Science Foundation of China [51772183]
- National Research Foundation of Korea [2018R1D1A1A09083897, 2018H1D3A2000611] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The two key factors such as light adsorption and separation of charge carriers in photocatalysts play crucial roles in determining the overall photocatalytic efficiency. Herein, we report synergetic effects of Fe-doping and Au nanoparticles (Au-NPs) deposition on the photocatalytic activity of the modified Bi4O5Br2 (BOB) nanosheets photocatalyst for Bisphenol A degradation and gaseous NO oxidative removal. Fe-doped BOB nanosheets decorated with Au-NPs are synthesized by a two-step chemical method. It was found that the Fe-doped BOB sample decorated with Au-NPs (Au-Fe-BOB) exhibits higher photocatalytic activity than the BOB, Fe-doped BOB, and Au-NPs-loaded BOB samples. Internal Fe-doping in the BOB enhanced the visible light absorption and the separation efficiency of photogenerated charge carriers acting as a scavenger. Moreover, the decorated Au-NPs in the composite photocatalyst extended the light adsorption in the range of visible and near- infrared light due to surface plasmon resonance effect of Au-NPs. The spin trapping measurements of Au-Fe-BOB composite photocatalyst show that the center dot O-2(-) is a main reactive species during the photocatalytic reaction under visible-light irradiation. The excellent photocatalytic efficiency and stability of Au-Fe-BOB with visible-light response allow to be readily constructed and applied for practical removal of various pollutants using solar light in the future.
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