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采用溶胶-凝胶法制备纯TiO2和Gd3+/Eu3+共掺杂TiO2复合粉体,采用X射线衍射、漫反射光谱和扫描电镜等技术对样品进行表征,以亚甲基蓝(methyleneblue,MB)的光催化降解为目标反应评价其光催化活性,探讨Gd3+/Eu3+共掺杂对TiO2粉体光催化的影响机制。结果表明:Gd3+/Eu3+共掺杂可以显著提高TiO2粉体光催化活性。Gd3+/Eu3+共掺杂在TiO2粉体中产生协同作用,可以抑制TiO2由锐钛矿向金红石相转变,使TiO2的粒径减小。Gd3+/Eu3+共掺杂增大了TiO2粉体的晶格畸变,使TiO2粉体吸收带边蓝移。当Gd3+和Eu3+的质量掺量分别为0.05%和0.4%时,TiO2粉体光催化活性最高,降解率达到95.31%。
The pure TiO2 and Gd3 + / Eu3 + co-doped TiO2 composite powders were prepared by sol-gel method. The samples were characterized by X-ray diffraction, diffuse reflectance spectroscopy and scanning electron microscopy. The photocatalytic degradation of methylene blue The photocatalytic activity was evaluated as a target reaction and the mechanism of photocatalytic effect of Gd3 + / Eu3 + co-doping on TiO2 powder was discussed. The results show that: Gd3 + / Eu3 + co-doping can significantly improve the photocatalytic activity of TiO2 powder. Gd3 + / Eu3 + co-doping in the TiO2 powder synergistic effect can inhibit TiO2 from anatase to rutile phase transition, the particle size of TiO2 decreases. Gd3 + / Eu3 + co-doping increases the lattice distortion of the TiO2 powder and makes the blue shift of the absorption edge of the TiO2 powder. When the mass contents of Gd3 + and Eu3 + were 0.05% and 0.4% respectively, TiO2 powder had the highest photocatalytic activity with the degradation rate of 95.31%.