铽负载介孔二氧化钛的制备、表征和协同效应

以嵌段共聚物P123为模板剂，采用蒸发诱导自组装法制备了铽负载介孔TiO2光催化剂，并利用XRD、N2吸附解吸和UV-Vis吸收光谱等技术手段对样品进行了表征。 制备的样品为锐钛矿和金红石混合晶相，以罗丹明B为模拟有机降解物，样品显示了良好的可见光催化活性。 研究发现0.7%的铽负载和380 ℃的煅烧温度是较佳的制备条件。 介孔结构所具有的高的比表面积、小的晶粒尺寸、铽负载诱导的电荷分离和可见光吸收增强协同提高了光催化活性。 同时，提出了铽负载二氧化钛诱导增强光催化作用的机理。

Synthesis,Characterization and Synergistic Effect of Tb-loaded Mesoporous Titanium Dioxide

Using block copolymer P123 as the template, Tb(terbium)-loaded mesoporous TiO2 photocatalysts were prepared by the evaporation induced self-assembly method and characterized by X-ray diffraction(XRD), N2 adsorption-desorption and ultraviolet-visible(UV-Vis) absorbance spectroscopy. Tb-loaded mesoporous TiO2 with a mixture of anatase and rutile phases exhibits a high photocatalytic activity for degradation of rhodamine B(RhB) under the irradiation of visible light. It is found that 0.7% loading of Tb and 380 ℃ calcination temperature are the most appropriate preparation conditions for achieving high photocatalytic performance. The synergistic effect of high specific surface area, small crystallite size of mesoporous TiO2, Tb-induced charge-eparation and increase of visible light absorption has improved the photocatalytic activity. The mechanism of enhancement of photocatalysis in Tb loaded TiO2 is proposed.