稀土掺杂TiO_2薄膜的制备及光催化特性

Synthesis and Photocatalytic Properties of Lanthanide Metal-ion Doped TiO_2 Thin Film

用Sol gel法制备出一系列镧系离子掺杂的TiO2薄膜,经X射线衍射(XRD)、紫外可见(UV Vis)吸收光谱表征该TiO2薄膜,并研究了其光催化活性.XRD研究结果表明:镧系离子掺杂TiO2薄膜的XRD与未掺杂薄膜的XRD基本一致.在控制实验条件下,主要为锐钛矿型晶型.UV Vis吸收光谱表明:当λ>360nm时其吸光值低于0.4,并测得薄膜的厚度.光催化降解罗丹明B的实验表明,掺杂稀土离子的TiO2薄膜的光降解效率高于未掺杂的TiO2薄膜.当n(La)=0.5%,n(Eu)=0.7%,n(Er)=0.8%(n为摩尔比)时的降解效率达到最大.而不同镧系离子在最佳掺杂量时的光降解效果为:La3+>Eu3+>Er3+.

Lanthanide metal-ion doped TiO_2 nanocrystalline thin films were obtained with Sol-gel method and characterized with X-ray diffraction(XRD) and UV-Vis spectrum . XRD results show that there is not much difference between the Ln^(3+)-ion doped TiO_2 thin films and non-doped thin films, the anatase is the dominant component under the controlled experimental conditions. UV-Vis absorption spectrum shows that when λ>360 nm, the absorbency of the thin films is less than 0.4. The photocatalytic degradation of rhodamine B with thin films reveals that the efficiency of photocatalytic degradation of Ln^(3+)-ion doped thin films is higher than non-doped thin films. The efficiency of photocatalytic degradation reach the maxima when the content of doped La(NO_3)_3, Eu(NO_3)_3, Er(NO_3)_3 is 05%, 07%, 09% respectively, and also the photocatalytic degradation efficiency of Ln^(3+)-ion doped thin films in their optiomal doped value is : La^(3+)>Eu^(3+)>Er^(3+).