采用溶胶-凝胶法制备了稀土Yb掺杂纳米Ti02光催化剂（Yb-TiO2），采用XRD、UV-Vis、FT-IR等方法对其进行表征和分析，并以亚甲基蓝（MB）作为目标降解物，考察了热处理温度以及Yb掺杂量对样品性能的影响。实验结果表明，Yb掺杂样品均为金红石相和锐钛矿相的混晶相，Yb的掺入拓展了TiO2对可见光的吸收范围，有效地抑制了光生电子-空穴对的复合，提高了TiO2的光催化活性。当pH值-2．5、n（Yb）：n（Ti）-0．005、热处理温度为650℃时，制备的样品其光催化活性明显优于Degussa P25。
Yb-doping TiO2 photocatalysts were synthesized by sol-gel method and characterized by XRD, UVVis, FT-IR et al. Meanwhile, the degradation of methyl blue （MB） was investigated under fluorescent lamp to test the influence of different Yb-doping concentration and sintered temperature on the photocatalytic activity of the prepared samples. The results show that all the prepared samples consist of anatase and futile phases. Yb- doping can extend the absorption spectrum of TiO2 to the visible light region and increase the separation of the photoelectron-hole pairs. Thus, the photocatalytic activity is improved. The best preparation condition is as fol- lows： sintered temperature T=650℃, Yb-doping concentration： n（Yb） ： n（Ti） = 0.005 and pH value=2.5.
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