摘要
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 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.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2010年第3期355-359,共5页
Journal of University of Science and Technology Beijing
基金
国家自然科学基金资助项目(No.50672006
No.50872011
No.50874013
No.NCET-08-0723)
关键词
二氧化钛
掺杂
荧光性能
光催化性能
titanium dioxide
doping
fluorescence
photocatalytic property
