铽负载介孔二氧化钛的制备、表征和协同效应

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

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。

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 futile 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-separation and increase of visible light absorption has improved the photocatalytic activity. The mechanism of enhancement of photocatalysis in Tb loaded TiO2 is proposed.