Influence of Ho3+/La3+-Doping on Photocatalytic Activity of TiO2 for Methyl Orange Degradation
来源期刊：Journal of Rare Earths2006年第S2期
论文作者：石建稳 郑经堂 胡燕 赵玉翠
文章页码：110 - 114
摘 要：The un-doped and Ho3+/La3+-doped TiO2 nanoparticles were prepared by sol-gel method with Ti （OC4H9）4 as raw material and characterized with X-ray diffraction （XRD） and UV-Vis absorption spectra （UV-Vis）, and their photocatalytic activity were evaluated in the methyl orange （MO） degradation in aqueous suspension under UV irradiation. XRD shows that all samples preserve anatase structure. Ho3+/La3+-doping inhibites the increase of crystallite size, and leads to the lattice expansion and aberrance. A tiny blue-shift of the absorption profile in Ho3+-doped samples and a red-shift of the absorption profile in La3+-doped samples are found. Ho3+-doping and La3+-doping improve photocatalytic activity of TiO2 markedly. In the experiment condition, the optimum Ho3+ concentration is about 0.3% for the maximum photocatalytic degradation, and the optimum La3+ concentration is about 0.1%. The photocatalytic degradation efficiency of Ho3+-doping is almost equal to La3+-doping in their optimum doped concentration.
石建稳，郑经堂，胡燕，赵玉翠
摘 要：The un-doped and Ho3+/La3+-doped TiO2 nanoparticles were prepared by sol-gel method with Ti （OC4H9）4 as raw material and characterized with X-ray diffraction （XRD） and UV-Vis absorption spectra （UV-Vis）, and their photocatalytic activity were evaluated in the methyl orange （MO） degradation in aqueous suspension under UV irradiation. XRD shows that all samples preserve anatase structure. Ho3+/La3+-doping inhibites the increase of crystallite size, and leads to the lattice expansion and aberrance. A tiny blue-shift of the absorption profile in Ho3+-doped samples and a red-shift of the absorption profile in La3+-doped samples are found. Ho3+-doping and La3+-doping improve photocatalytic activity of TiO2 markedly. In the experiment condition, the optimum Ho3+ concentration is about 0.3% for the maximum photocatalytic degradation, and the optimum La3+ concentration is about 0.1%. The photocatalytic degradation efficiency of Ho3+-doping is almost equal to La3+-doping in their optimum doped concentration.
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