采用溶胶-凝胶法制备了Y~(3+)掺杂TiO_2纳米粉体.通过FT-IR、SEM、XRD 以及UV-Vis等表征手段,系统地探讨了Y~(3+)掺杂量对掺杂粉体的表面结构、相组成及光学性能的影响.研究结果表明,Y~(3+)离子的掺杂能有效抑制TiO_2的相转变(由锐钛矿转变为金红石)与提高比表面积.同时Y~(3+)离子的掺杂也使制备粉体的能带带隙变宽,形成了较大的氧化还原电势.在紫外光辐照下,Y~(3+)掺杂纳米TiO_2粉体对甲基橙的催化降解表现出较好的催化性能:当pH为3、3.0 mol% Y~(3+)的TiO_2纳米粉体的用量为0.8 g/L时,甲基橙的降解率为49.4%.
Nanostructured Y~(3+) doped TiO_2 particles have been prepared by a simple sol-gel method. The influence of Y~(3+)-doping content on the surface structure, phase composition and optical properties of TiO_2 were systematically investigated by FT-IR, SEM, XRD and UV-Vis measurements. Our results indicate that Y~(3+) doping can prohibit the phase transformation of TiO_2 (i.e., from anatase to rutile), and increase the particle's specific surface area. TiO_2 nanoparticles with Y~(3+) doped increase the optical band gap, and yield a larger redox potential. Under the ultraviolet light radiation, the obtaining Y~(3+) doped TiO_2 nanoparticles exhibit good photocatalytic activity in the methyl orange system (Y~(3+) content=3.0 mol%, pH=3, and the dose of catalysts=0.8 g/L, the degradation of methyl orange ～49.4%).
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