Wang Yong, Chen Guihua, Shen Qianhong, Yang Hui, Li Liquan, Song Yanjiang
J Nanosci Nanotechnol. 2014 Jul;14(7):4988-94. doi: 10.1166/jnn.2014.9487.
Pr3+ doped mesoporous TiO2 photocatalysts with a different molar ratio of Pr to Ti were prepared by a hydrothermal method using triblock copolymer as the template. The as-prepared samples were systematically characterized by X-ray diffraction, N2 adsorption-desorption, X-ray photoelectron spectra, transmission electron microscopy and UV-visible diffuse reflectance spectroscopy. The characterizations indicated all the samples had mesoporous structure and narrow pore size distribution. Pr3+ doping enlarged the surface area and decreased the crystallite size. The surface area of the samples varied from 136 to 170 m2/g, and the average crystallite size ranged between 5.04 and 7.60 nm. The effect of Pr3+ doping amount on the photocatalytic activity of mesoporous TiO2 was evaluated by the degradation of methyl orange under UV light irradiation. The results showed that the suitable amount of Pr3+ doped samples exhibited the higher photocatalytic activity than mesoporous TiO2. Among the samples, 1 at.% Pr3+ doped mesoporous TiO2 showed the highest photocatalytic activity.
采用水热法，以三嵌段共聚物为模板，制备了不同Pr与Ti摩尔比的Pr3+掺杂介孔TiO2光催化剂。通过X射线衍射、N2吸附-脱附、X射线光电子能谱、透射电子显微镜和紫外-可见漫反射光谱对所制备的样品进行了系统表征。表征结果表明，所有样品均具有介孔结构且孔径分布较窄。Pr3+掺杂增大了比表面积并减小了晶粒尺寸。样品的比表面积在136至170 m2/g之间变化，平均晶粒尺寸在5.04至7.60 nm之间。通过紫外光照射下甲基橙的降解来评价Pr3+掺杂量对介孔TiO2光催化活性的影响。结果表明，适量Pr3+掺杂的样品比介孔TiO2表现出更高的光催化活性。在所有样品中，1 at.% Pr3+掺杂的介孔TiO2表现出最高的光催化活性。
