采用溶胶-凝胶法制备了系列Eu^3+和Y^3+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:Eu^3+和Y^3+双稀土离子共掺杂比Eu^3+或Y^3+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;Eu^3+和Y^3+双稀土离子共掺杂TiO2纳米体系中均能得到Eu^3+特征发射光谱;以少量Y^3+替代Eu^3+时,Eu^3+发光性能变得更强.以甲基蓝溶液为目标污染物,考察了Eu^3+和Y^3+双稀土离子共掺杂TiO2纳米粉体的光催化活性.结果表明,Eu^3+和Y^3+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Eu^3+和Y^3+稀土离子的最佳掺杂配比为1:4.
A series of Eu^3+ and Y^3+ doped TiO2 nanopowders were prepared by sol-gel method.The microstructures and properties of the samples were characterized by means of XRD,BET,SEM,UV-Vis and fluorescence spectra.It is indicated that the doping of Eu^3+ and Y^3+ together in TiO2 can inhibit the phase transformation of nano TiO2,increase the specific surface area and induce the blue shifting in the UV-Vis spectra.All the systems co-doped with Eu^3+ and Y^3+ show the characteristic fluorescence spectra of Eu^3+,and the emission intensity of Eu^3+ increases with Y^3+ replacing Eu^3+.The photocatalytic activities of TiO2 nanopowders co-doped with Eu^3+ and Y^3+ were tested for degradation of methyl blue solutions.The results show that the doping of Eu^3+ and Y^3+ together,compared with the doping of Eu^3+ or Y^3+ respectively,can increase the photocatalytic activities of TiO2 nanopowders and the best molar ratio of Eu^3+∶Y^3+ is 1∶4.