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Enhanced Visible Light‐Driven Photocatalytic Performance of La‐Doped TiO 2− x F x
Author(s) -
Cao Guangxiu,
Li Yaogang,
Zhang Qinghong,
Wang Hongzhi
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03364.x
Subject(s) - photocatalysis , x ray photoelectron spectroscopy , calcination , doping , materials science , visible spectrum , valence (chemistry) , band gap , analytical chemistry (journal) , valence band , spectroscopy , absorption spectroscopy , nuclear chemistry , crystallography , chemistry , catalysis , optics , physics , nuclear magnetic resonance , biochemistry , optoelectronics , organic chemistry , chromatography , quantum mechanics
La‐doped TiO 2− x F x (La–TiO 2− x F x ) powders were prepared by the sol–gel method. X‐ray diffraction results showed that La efficiently inhibited grain growth. X‐ray photoelectron spectroscopy spectra revealed that La 2 O 3 and O–Ti–F bonds have formed, the La 2 O 3 maintained the high surface area of TiO 2− x F x after calcination at a temperature above 500°C, while the O–Ti–F bonds increased the oxidation potential of the photogenerated hole in the valence band. The UV‐vis spectroscopy of the La–TiO 2− x F x showed that the presence of intraband gap states was likely responsible for its absorption of visible light. When the molar ratios of La and F to Ti were 1.5:100 and 5:100, respectively, and calcined at 500°C, the photocatalytic degradation rate of methylene blue over La–TiO 2− x F x was about 1.5 times higher than that of F‐doping TiO 2 .