镧掺杂介孔TiO2光催化剂的制备、表征及其光催化性能

Preparation, Characterization and Photocatalytic Activity of Lanthanum Doped Mesoporous Titanium Dioxide

以钛酸四正丁酯和硝酸镧为原料，以P123为模板剂，采用模板法合成了La掺杂型介孔TiO2比催化剂，借助TGA-DSC、BET、xRD及uV-Vis等测试手段对样品进行了表征，并以苯酚为模型污染物考察了镧掺杂艟对样品光催化活性的影响．结果表明：La掺杂介孔TiO2光催化剂孔径分布较均匀（-10nml，比表面积可达165m^2／g．与纯介孔TiO2相比，经掺杂改性后的样品在紫外光区及可见光区的吸收显著增强，对光具有更高的利用率。

Lanthanum doped mesoporous titanium dioxide photocatalysts with different La content were synthesized by template method using tetrabutyltitanate （Ti（OC4H9）4） as precursor and Pluronic P123 as template. The catalysts were characterized by thermogravimetric dif ferential thermal analysis, N2 adsorption-desorption measurements, X-ray diffraction, and UV-Vis adsorption spectroscopy. The effect of La3＋ doping concentration from 0.1% to 1% on the photocatalytic activity of mesoporous TiO2 was investigated. The characterizations indicated that the photocatalysts possessed a homogeneous pore diameter of about 10 nm with high surface area of 165 m2/g. X-ray photoelectron spectroscopy measurements in- dicated the presence of C in the doped samples in addition to La. Compared with pure mesoporous TiO2, the La-doped samples extended the photoabsorption edge into the visible light region. The results of phenol photodecomposition showed that La-doped mesoporous TiO2 exhibited higher photocatalytic activities than pure mesoporous TiO2 under UV and visible light irradiation.