稀土离子(La^3＋,Eu^3＋)掺杂纳米TiO2的光催化性能  

Photocatalytic Performance of Rare Earth Ions(La^(3+),Eu^(3+)) Doped Nano-TiO_2

作　　者：孙俊英[1] 孟大维[1] 刘卫平[1] 汪新星[1] 王革[2] 

机构地区：[1]中国地质大学材料科学与化学工程学院 [2]辽源职业技术学院,辽宁辽源136201

出　　处：《稀有金属》2008年第4期497-501,共5页Chinese Journal of Rare Metals

基　　金：国家自然科学基金(40672136,40572114);高等学校博士学科点专项科研基金(20060491504);地质过程与矿产资源国家重点实验室开放基金(GPMR0521)资助项目

摘　　要：采用溶胶-凝胶法制备了Eu3+,La3+掺杂纳米TiO2粉体,并采用亚甲基蓝为目标降解物考察了稀土掺杂对TiO2光催化活性的影响。实验表明:适量的La3+掺杂可以提高TiO2的光催化活性,最佳掺杂浓度为0.3 mol%;La3+掺杂后降解反应符合一级反应动力学,H2O2的加入会使其反应速率大大提高;0.25 mol%Eu3+掺杂在日光灯下较紫外灯下显示出更好的光催化活性,这可能由于Eu3+掺杂导致了TiO2吸收光谱范围的整体红移;通过XRD图谱分析可以看出La3+、Eu3+掺杂均可以抑制TiO2的晶型转变,减小光催化剂的平均粒径,掺杂后其平均粒径均约为10 nm,TEM结果与XRD大致吻合。Eu^3 ＋ , La^3 ＋ doped TiO2 powders were prepared by sol-gel method and its photocatalytic activity was studied by using methylene blue as an objective of degradation product. The experimental results showed that ： proper amounts of La^3 ＋ doping could improve the photocatalytic activity and the best doping concentration was 0.3mol%, the degradation reaction of La^3＋ doped TiO2 followed first of H2O2 could speed up order kinetics, the addition the reaction; photocatalytic activity of 0. 25mol% Eu^3＋ doped TiO2 under fluorescent lamp was better than that of under UV, that might be due to red shift of overall absorption spectrum of TiO2 caused by Eu^3＋ doping. In addition, from XRD result it was showed that La^3＋, Eu^3＋ doping could restrain the phase transformation of TiO2 and reduce the average particle size particles of the photocatalysts to about 10 nm, with which the TEM results approximately agreed

关 键 词：溶胶-凝胶法 纳米TIO2 稀土掺杂 光催化活性 

分 类 号：O647[理学—物理化学]