Effect of Ho-doping on photocatalytic activity of nanosized TiO2 catalyst
来源期刊：JOURNAL OF RARE EARTHS2008年第1期
论文作者：YU Lin LIU Guoguang LI Daguang LI Xiaoxia Lü Wenying CAI Heshan
Key words：titanium dioxide; Ho-doping; chaxacterization; photocatalysis; methyl orange; rare earths;
Abstract: Ho-doped TiO2 nanoparticles with higher photocatalytic activity were prepared by an acid-catalyzed sol-gel method. The photocatalytic decomposition of methyl orange in aqueous solution was used as a probe reaction to evaluate their photocatalytic activities. The effects of Ho doping on the crystallite sizes, crystal pattern, surface composition, and optical property of the catalysts were investigated by means of techniques such as X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Diffuse Reflectance UV-Vis Spectroscopy (UV-Vis DRS), Fourier Transform Infrared (FT-IR), and Photo-Luminiscence (PL) spectra. Moreover, the modification mechanism of Ho doping was also discussed. The results showed that Ho doping could inhibit phase transformation from anatase to ruffle, suppress the growth of TiO2 grains, cause blue shift of the absorption spectrum edge, accelerate surface hydroxylation, and enhance the separation efficiency of photoinduced electron-hole pairs, which resulted in a significant improvement in the photoreactivity of Ho-doped TiO2. Among them, the Ho-doped TiO2 calcined at 500 ℃ achieved the highest photocatalytic activity.
YU Lin1，LIU Guoguang2，LI Daguang1，LI Xiaoxia3，Lü Wenying2，CAI Heshan1
(1.Department of Resource and Environment,Foshan University,Foshan 528000,China;
2.Faculty of Environmental Science and Engineering,Cuangzhou 510006, China;
3.Faculty of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,China)
Abstract:Ho-doped TiO2 nanoparticles with higher photocatalytic activity were prepared by an acid-catalyzed sol-gel method. The photocatalytic decomposition of methyl orange in aqueous solution was used as a probe reaction to evaluate their photocatalytic activities. The effects of Ho doping on the crystallite sizes, crystal pattern, surface composition, and optical property of the catalysts were investigated by means of techniques such as X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Diffuse Reflectance UV-Vis Spectroscopy (UV-Vis DRS), Fourier Transform Infrared (FT-IR), and Photo-Luminiscence (PL) spectra. Moreover, the modification mechanism of Ho doping was also discussed. The results showed that Ho doping could inhibit phase transformation from anatase to ruffle, suppress the growth of TiO2 grains, cause blue shift of the absorption spectrum edge, accelerate surface hydroxylation, and enhance the separation efficiency of photoinduced electron-hole pairs, which resulted in a significant improvement in the photoreactivity of Ho-doped TiO2. Among them, the Ho-doped TiO2 calcined at 500 ℃ achieved the highest photocatalytic activity.
Key words:titanium dioxide; Ho-doping; chaxacterization; photocatalysis; methyl orange; rare earths;
【全文内容正在添加中】
