Preparation, Characterization and Photo-Catalytic Behavior of Y2O3/TiO2 Composite Semiconductor Nanopowder
来源期刊：JOURNAL OF RARE EARTHS2001年第3期
论文作者：万洪富 李新军 黄志尧 古国榜 李芳柏
Abstract: Y2O3/TiO2 samples were prepared by sol-gel process and characterized by means of X-ray diffraction (XRD), laser Raman spectra (LRS), UV-visible diffuse reflectance spectra (DRS), specific surface area (BET), and transmission electron microscopy (TEM). The results show that the relative intensity of 101 peak of anatase and 002 peak of rutile, the mean crystal diameter and mean particle diameter of Y2O3/TiO2 samples decrease while specific surface area increases owing to doping Y2O3. Y2O3/TiO2 samples have a larger specific surface area and higher thermal stability. Owing to quantum size effect, the reflectance of Y2O3/TiO2 samples is larger than that of pure TiO2 in the range of 380～460 nm and the position of Raman peaks varies slightly. Being a model reaction, the photo-catalytic degradation of methylene blue (MB) with positive charge and methyl orange (MO) with negative charge was investigated in TiO2 and Y2O3/TiO2 nanopowder suspension irradiated by high-pressure mercury lamp. As a result, the addition of Y2O3 to TiO2 is detrimental to photo-activity of TiO2 for MB photo-degradation and photo-catalytic behavior is enhanced due to 5%, 10% Y2O3 deposited on TiO2 for the photo-degradation of MO. And the relationship between photo-physical properties and photo-activity was discussed.
万洪富1，李新军2，黄志尧1，古国榜3，李芳柏1
(1.Guangdong Institute of Eco-Environment and Soil Science,;
2.Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences,;
3.College of Chemical Engineering, South China University of Technology,)
Abstract:Y2O3/TiO2 samples were prepared by sol-gel process and characterized by means of X-ray diffraction (XRD), laser Raman spectra (LRS), UV-visible diffuse reflectance spectra (DRS), specific surface area (BET), and transmission electron microscopy (TEM). The results show that the relative intensity of 101 peak of anatase and 002 peak of rutile, the mean crystal diameter and mean particle diameter of Y2O3/TiO2 samples decrease while specific surface area increases owing to doping Y2O3. Y2O3/TiO2 samples have a larger specific surface area and higher thermal stability. Owing to quantum size effect, the reflectance of Y2O3/TiO2 samples is larger than that of pure TiO2 in the range of 380～460 nm and the position of Raman peaks varies slightly. Being a model reaction, the photo-catalytic degradation of methylene blue (MB) with positive charge and methyl orange (MO) with negative charge was investigated in TiO2 and Y2O3/TiO2 nanopowder suspension irradiated by high-pressure mercury lamp. As a result, the addition of Y2O3 to TiO2 is detrimental to photo-activity of TiO2 for MB photo-degradation and photo-catalytic behavior is enhanced due to 5%, 10% Y2O3 deposited on TiO2 for the photo-degradation of MO. And the relationship between photo-physical properties and photo-activity was discussed.
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