La^(3+)-Pr^(3+)共掺杂纳米TiO_2粉体的光催化性能  

Influence of La^(3+) and Pr^(3+) co-doped on photocatalytic properties of TiO_2 nanoparticles

作　　者：谢英娜[1] 安胜利[2] 袁春华[1] 

机构地区：[1]内蒙古科技大学化学与化工学院,包头014010 [2]内蒙古科技大学材料与冶金工程学院,包头014010

出　　处：《复合材料学报》2012年第6期97-101,共5页Acta Materiae Compositae Sinica

基　　金：内蒙古包头市科技局资助项目(2010Z1002);内蒙古科技大学创新基金(2011NCL025)

摘　　要：以钛酸四丁酯(TBT)为原料,采用溶胶-凝胶法制备了纯TiO2和La3+-Pr3+共掺杂复合粉体(La3+-Pr3+/TiO2),采用XRD、UV-Vis和TEM等测试手段分析了在紫外光照射下,以降解甲基橙为探针反应研究其可见光催化性能。结果显示:所有样品均为锐钛矿相纳米TiO2,稀土元素镧和镨掺杂后TiO2特征衍射峰宽化,强度降低;与纯TiO2、镧掺杂TiO2与镨掺杂TiO2相比,光催化剂La3+-Pr3+共掺杂TiO2颗粒的粒径更小,比表面积更大,光吸收边红移程度更显著;与未掺杂和单一掺杂的TiO2相比较,共掺杂的TiO2具有更高的可见光催化性能。当La3+与TiO2和Pr3+与TiO2的摩尔比分别为1.0%和0.2%时,可见光催化性能最好。可见光催化性能的提高归因于镧和镨的协同作用。Abstract： Pure nano TiO2 and La^3＋- Pr^3＋ co-doped nano-TiO2 （La^3＋- Pr^3＋/TiO2） catalyst were prepared by a sol-gel method with TBT and distilled water as forerunner body, ethanol as solvent and glacial acetic acid as inhibitor. The prepared samples were characterized by XRD, TEM and UV - Vis. The UV- light photocatalytic performance of the obtained materials was evaluated by methylene orange decomposition. The results show that the prepared samples are all pure anatase phase nano-TiO2 and their diffraction peak broadens obviously after La^3＋ - Pr^3＋ co-doped. Compared with pure TiO2, the particle sizes of La^3＋- Pr^3＋ co-doped TiO2 are smaller, its specific surface area is larger, and its absorption edge shifts more remarkably towards longer wavelength. The photocatalytic activity of La^3＋- Pr^3＋ co-doped TiO2 is higher than that of TiO2 or La^3＋ （Pr^3＋） -doped TiO2, which is enhanced with the La^3＋ and Pr^3＋ contents, reaching the maximum at the La^3＋/TiOz and Pr^3＋/TiO2 molar ratios of 1.0% and 0.2%, respectively. The enhanced visible photocatalytic performance is attributed to the synergetic effect of La^3＋ and Pr^3＋ co-doped.

关 键 词：纳米TIO2粉体 La3+-Pr3+共掺杂 溶胶-凝胶法 甲基橙 光催化降解 

分 类 号：TB333[一般工业技术—材料科学与工程] O643[理学—物理化学]