水热合成掺镧钛酸铋粉体及其光催化性能探讨

Study on synthesis of lanthanum-doped bismuth titanate powder by hydrothermal method and on its photocatalytic performances

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6h的条件下，可得到各向异性、短轴为30nm、长轴大于100nm的掺镧钛酸铋粉体，且该方法所制备的掺镧钛酸铋（Bi4-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 · 5 H2O ], 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. Photocatalytie activity of the samples degrading methyl orange were investigated via UV - Vis. Results showed that anisotropic lanthanum-doped bismuth titanate { Bi4-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 Bi4-xLaxTi3O12 powders had photocatalytie activity.