以硝酸铋、四氯化钛和硝酸镧为原料,以氢氧化钾为矿化剂,采用水热法合成了不同镧掺杂量的钛酸铋粉体.用X射线衍射(XRD)和透射电镜(TEM)对所得粉体进行了表征,借助紫外-可见分光光度计考察了样品降解甲基橙的光催化性能.实验结果显示:在水热合成温度为220～280 ℃、保温时间为6 h的条件下,可得到各向异性、短轴为30 nm、长轴大于100 nm的掺镧钛酸铋粉体,且该方法所制备的掺镧钛酸铋(Bi 4-xLaxTi3O12)粉体具有一定的光催化效果.%Bismuth titanate powders doped with different amounts of lanthanum were synthesized by hydrothermal method using bismuth nitrate [Bi(NO3)3·5H2O],titanium tetrachloride (TiCl4),and lanthanum nitrate [La(NO3)2·6H2O] as raw materials,and potassium hydroxide (KOH) acted as mineralizer.XRD and TEM were used to characterize prepared powders.Photocatalytic activity of the samples degrading methyl orange were investigated via UV-Vis.Results showed that anisotropic lanthanum - doped bismuth titanate (Bi 4-xLaxTi3O12) nano - powders possessing short axis of 30 nm and long axis of more than 100 nm were obtained,under the condition of hydrothermal synthesis temperature of 220～280 ℃ and soaking time of 6 h.And Bi 4-xLaxTi3O12 powders had photocatalytic activity.
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