Enhanced Visible Light-Driven Photocatalytic Performance of La-Doped TiO2−xFx |
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| Authors: | Guangxiu Cao Yaogang Li Qinghong Zhang Hongzhi Wang |
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| Affiliation: | State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China;
Department of Chemistry, Shangqiu Normal University, Shangqiu 476000, China;
Engineering Research Center of Advanced Glasses Manufacturing Technology, MOE, Donghua University, Shanghai 201620, China |
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| Abstract: | La-doped TiO2? x F x (La–TiO2? 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 La2O3 and O–Ti–F bonds have formed, the La2O3 maintained the high surface area of TiO2? 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–TiO2? 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–TiO2? x F x was about 1.5 times higher than that of F-doping TiO2. |
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