中文摘要：

以钛酸四丁酯、氢氧化钾和镧系金属氧化物为原料。采用微乳液法制备了系列超细K2Ln2Ti3O10（Ln=La．Ce,Pr．Nd，Sm，Eu，Gd）光催化剂。并考察了其光催化活性。通过X射线衍射（XRD）、透射电镜（TEM）和紫外可见吸收光谱（UV—Vis）对其进行了表征。结果表明：用微乳液法制备催化剂可以在较低的温度下（900℃），用较短的烧结时间（3h）合成结晶度高、粒径较小（200Mm）的K2Ln2Ti3O10钙钛矿型层状结构化合物。催化剂在紫外光和可见光条件下均具有光催化降解甲基橙的活性。紫外光条件下可以明显提高光催化降解活性，降解率达到60％。

英文摘要：

A series of uhrafine K2Ln2Ti3O10（Ln = La, Ce, Pr, Nd, Sm, Eu, Gd）photocatalyst was prepared by microemulsion method based on tetrabutyl titanate reacting with potassium hydroxide and lanthanumoxide. The obtained products were characterized by XRD, TEM and UV-Vis spectra. These results indicate that highly uhrafine K2Ln2Ti3O10 can be accessible at lower fabricating temperature and shorter reation time by this approach. In addition, the investigation on their catalytic behavior based on the degradation of methyl orange under UV-Vis light suggests that the degradation rate can reach up to 60%.