期刊
SURFACE & COATINGS TECHNOLOGY
卷 315, 期 -, 页码 196-204出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2017.02.043
关键词
Micro-arc oxidation; TiO2; Fe3+:TiO2; Impregnation; Photocatalytic activity
资金
- Research on Public Welfare Technology Application Projects of Zhejiang Province [2017C31039]
- National Natural Science Foundation of China [51275477, 61572438, 51371039]
First, the TiO2 films prepared by micro-arc oxidation (MAO) were formed in phosphate based electrolyte on pure titanium; after that, they were impregnated with Fe3+-containing electrolyte to produce the Fe3+:TiO2 composite films. Effects of the applied current density and impregnation time and concentration on physical and chemical properties of TiO2 and Fe3+:TiO2 composite films were investigated by Scanning electron microscopy (SEM), stereoscopic microscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray spectroscopy (EDS). A UV-vis spectrophotometer was also used to study photocatalytic properties of both films. It is indicated that the film formed in, phosphate-based electrolyte were composed of anatase phase with varying fraction depending on the applied current density. XPS results revealed that Ti2p spin-orbit components of Fe3+:TiO2 composite films are shifted towards higher binding energy, with respect to TiO2 films, suggesting that some of the Fe3+ ions are incorporated into TiO2 lattice. Photocatalytic activity of the films was studied by measuring the degradation rate of methylene blue on their surface under simulated sunlight irradiation. The Fe3+:TiO2 composite 'films showed an obvious enhanced photocatalytic activity than the pure layers under UV-irradiation, while their photocatalytic degradation was much higher than that of the TiO2 film under the irradiation. (C) 2017 Elsevier B.V. All rights reserved.
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