期刊
CHINESE JOURNAL OF CHEMICAL PHYSICS
卷 21, 期 5, 页码 487-492出版社
CHINESE PHYSICAL SOC
DOI: 10.1088/1674-0068/21/05/487-492
关键词
TiO2; Cr doping; Photocatalysis; Micro arc oxidation
资金
- National High Technology Research
- Development Program of China [2007CB36600]
A series of Cr doped TiO2 films were prepared by micro arc oxidation (MAO) using an electrolyte of Na3PO4+K2Cr2O7. X-ray diffraction and scanning electron microscopy revealed that the films mainly consisted of anatase phase with a porous surface morphology. The films have an excellent photocatalytic effect for degradation of methylene blue and decomposition of water under visible light illumination. This arises from the formation of Cr3+/Cr4+ and oxygen vacancy energy levels owing to Cr doping. The former reduces the electron-hole recombination chance, while the latter generates a new gap between the conduction band (CB) and valence band (VB) of TiO2, which lowers the photo energy of the excited electron in the VB to the oxygen vacancy states. The mechanisms for film synthesis during the MAO process are also presented.
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