| Effect of Ho-doping on photocatalytic activity of nanosized TiO2 catalyst |
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| 作者姓名： | Lü Wenying |
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| 作者单位： | [1]Department of Resource and Environment, Foshan University, Foshan 528000, China [2]Faculty of Environmental Science and Engineering, Guangzhou 510006,China [3]Faculty of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China |
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| 基金项目： | 国家自然科学基金
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广东省自然科学基金
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广东省科技计划 |
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| 摘 要： | 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 rntile, 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.
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| 关 键 词： | 光催化材料 活性 纳米材料 二氧化钛 |
| 收稿时间： | 2006-10-27 |
| 修稿时间： | 2007-01-05 |
Effect of Ho-doping on photocatalytic activity of nanosized TiO2 catalyst |
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| Heshan CAI, Guoguang LIU, Wenying Lü, Xiaoxia LI, Lin YU,Daguang LI.Effect of Ho-doping on photocatalytic activity of nanosized TiO2 catalyst[J].Journal of Rare Earths,2008,26(1):71-75. |
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| Authors: | Heshan CAI Guoguang LIU Wenying Lü Xiaoxia LI Lin YU Daguang LI |
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| Affiliation: | aDepartment of Resource and Environment, Foshan University, Foshan 528000, China;bFaculty of Environmental Science and Engineering, Guangzhou 510006, China;cFaculty of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China |
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| 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 rutile, 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°C achieved the highest photocatalytic activity. |
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| Keywords: | titanium dioxide Ho-doping chaxacterization photocatalysis methyl orange rare earths catalyst nanosized photocatalytic activity significant improvement separation efficiency accelerate hydroxylation cause blue shift absorption spectrum edge suppress the growth results phase transformation anatase modification mechanism spectra Fourier |
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