Nano-TiO2 doped with Y3+ was prepared by sol-gel method and the photocatalystic activity under ultra-violet light was evaluated by photocatalytic degradation of methyl blue. The composition, crystallographic forms, and particle size were characterized by testing techniques such as XRD and particle size distribution. The results showed when the heated temperature of Y3+-doped TiO2 was 520 °C and the doped TiO2 remained in anatase. The anatase crystal had the average size of 20 nm. The doped caused red-shift of the uv-vis absorption spectra and enhanced the absorption of light. Optimal co-doping amount for Y3+ was n(Y3+): n(TiO2)=0.2% and under the condition the photocatalytic properties of TiO2 could be enhanced. The degradation rate of methyl blue examined after 2 hours’ reaction was 90.68%. It indicated better photocatalytic properties than the undoped TiO2. The reason for the improvement of the photocatalysis was the entry of Y3+into the lattice of TiO2 caused lattice distortion, which led to the red-shift of the uv-vis absorption spectra and enhanced the absorption of light.%采用溶胶-凝胶法制备了Y3+掺杂的TiO2纳米粉体，以亚甲基蓝溶液为目标降解物，研究了掺杂纳米TiO2纳米粉体在紫外光作用下的光吸收和光催化性能。通过XRD、紫外-可见分光光度计、UV-Vis等测试技术对样品的相组成、晶型和粒径尺寸等进行了表征。结果表明，经520℃热处理的Y3+掺杂的TiO2粉体，结晶完整，主晶相为锐钛矿型，平均粒径约为20 nm；掺杂使TiO2吸收带发生红移，光催化性能增强；掺杂体系的最佳量为n(Y3+)∶n(TiO2)=0.2%。此掺杂量的TiO2粉体对亚甲基蓝有良好的降解效果，反应2 h降解效果达90.68%，优于同等条件下制备的未掺杂的纯TiO2粉体。该样品光催化效果提高的原因是Y3+进入TiO2的晶格，引起了晶格的畸变使得掺杂样品紫外-可见吸收的吸收变发生了红移，提高光的利用率。
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