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采用溶胶-凝胶法制备了Y3+掺杂TiO2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Y3+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,Y3+离子的掺杂能有效抑制TiO2的相转变(由锐钛矿转变为金红石)与提高比表面积。同时Y3+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,Y3+掺杂纳米TiO2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、3.0mol%Y3+的TiO2纳米粉体的用量为0.8g/L时,甲基橙的降解率为49.4%。
Y3 + doped TiO2 nano-powders were prepared by sol-gel method. The effects of Y3 + doping amount on the surface structure, phase composition and optical properties of doped powders were systematically investigated by means of FT-IR, SEM, XRD and UV-Vis spectroscopy. The results show that the Y3 + doping can effectively inhibit the phase transition of TiO2 (from anatase to rutile) and increase the specific surface area. At the same time Y3 + ion doping also make the preparation of the bandgap broaden the energy band, forming a larger redox potential. Under UV irradiation, the catalytic performance of Y3 + -doped nano-TiO2 powders on the degradation of methyl orange showed good catalytic performance. When the dosage of TiO2 nanoparticles with pH3.0 and 3.0% Y3 + was 0.8g / L , The degradation rate of methyl orange was 49.4%.