中文摘要：

采用溶胶-凝胶法制备了Eu^3＋,La^3＋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La^3＋掺杂可以提高TiO2的光催化活性,最佳掺杂浓度为0.3 mol%;La^3＋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%Eu^3＋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Eu^3＋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La^3＋、Eu^3＋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。

英文摘要：

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