期刊
APPLIED SURFACE SCIENCE
卷 425, 期 -, 页码 377-383出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.06.300
关键词
SiO2@alpha-Fe2O3; Nanocomposites; Visible-light photocatalyst; Photo-Fenton process; Methylene blue dye
类别
资金
- Centre for Precision Analysis and Research, National Taipei University of Technology, Taipei, Taiwan
In this study, a simple sol-gel method was used for the synthesis of a core-shell structure of SiO2@alpha-Fe2O3 nanocomposites for employment as a visible light photocatalyst. It was observed that Ag nanoparticles about 20 nm in size were successfully deposited on the surface of the SiO2@alpha-Fe2O3 nanocomposites. The photocatalytic activity of the Ag-SiO2@alpha-Fe2O3 nanocomposites catalyst was investigated by observing the degradation of methylene blue (MB) dye in a photo-Fenton process. The results showed that the Ag nanoparticles acted as centers for photo induced electron transfer. The catalytic activity in the SiO2@alpha-Fe2O3 nanocomposites were enhanced due to the plasmoni c effect of Ag metal under visible light irradiation. The addition of H2O2 played an important role, generating more OH radicals which improved the photo-Fenton catalytic activity, resulting in quicker degradation of the MB dye using the Ag-SiO2@alpha-Fe2O3 nanocomposite catalyst. (C) 2017 Elsevier B.V. All rights reserved.
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