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采用溶胶-凝胶法制备了系列Eu3+和Y3+双稀土离子共掺杂的TiO2纳米粉体,通过X射线衍射(XRD)、BET、扫描电子显微镜(SEM)、UV-Vis漫反射和荧光光谱分析等对样品的微观结构和性能进行了表征.结果表明:Eu3+和Y3+双稀土离子共掺杂比Eu3+或Y3+单组分掺杂更能有效地抑制TiO2纳米晶体的晶型转变,提高其比表面积;UV-Vis漫反射曲线均有一定的蓝移现象;Eu3+和Y3+双稀土离子共掺杂TiO2纳米体系中均能得到Eu3+特征发射光谱;以少量Y3+替代Eu3+时,Eu3+发光性能变得更强.以甲基蓝溶液为目标污染物,考察了Eu3+和Y3+双稀土离子共掺杂TiO2纳米粉体的光催化活性.结果表明,Eu3+和Y3+双稀土离子共掺杂比单组分掺杂更能有效地提高TiO2纳米粉体的光催化活性,并且Eu3+和Y3+稀土离子的最佳掺杂配比为1:4.
A series of TiO2 nanoparticles co-doped with Eu3 + and Y3 + were prepared by sol-gel method. Their structures were characterized by XRD, BET, SEM, UV-Vis diffuse reflectance and fluorescence spectroscopy Were used to characterize the microstructure and properties of the samples.The results showed that the co-doping of Eu3 + and Y3 + double rare earth ions could effectively inhibit the crystal transition of TiO2 nanocrystals and increase the specific surface area ; The UV-Vis diffuse reflectance curves all have a certain blue shift phenomenon; Eu3 + and Y3 + rare earth ions co-doped TiO2 nano-system can be obtained Eu3 + characteristic emission spectrum; a small amount of Y3 + instead of Eu3 +, Eu3 + The methyl blue solution was taken as the target pollutant and the photocatalytic activities of Eu3 + and Y3 + double rare earth ions co-doped TiO2 nano-powders were investigated. The results show that Eu3 + and Y3 + double rare earth ions co- Can effectively improve the photocatalytic activity of TiO2 nano-powders, and the optimal doping ratio of Eu3 + and Y3 + rare earth ions is 1: 4.