Ce-TiO_2的制备与光催化性能研究

Preparation and Photocatalytic Properties of Ce-TiO_2 Powder

采用Sol-gel法制备Ce-TiO2粉体材料,使用XRD、DRUVS等仪器表征了Ce4+掺杂对样品晶型、光谱响应曲线、降解率等结构性能的影响,研究了三者间的相互关联.结果表明:Ce4+离子掺杂阻碍TiO2晶相的形成,在Ce4+掺杂质量分数为0.25时,对可见光吸收达到最高效率,光谱响应阈值为520 nm;在Ce4+掺杂质量分数为0.15时,阳光直射下对甲基橙降解率达到最高,为91.8%.晶型结构决定可见光吸收与降解率.

In order to enhance TiO2 response to visible light and improve photocatalytic degradation, the micro - structure, such as crystal phase, and macro - performance, such as light response curve, photocatalytic degradation rate of Ce - TiO2, which were prepared by Sol - gel method, were analyzed by XRD and DRUVS measurements. Through modifying Ce4＋ ratio, the factors that affect the structure and properties have been found. The results indicate that with the increasing of Ce concentration, the phase transition is prevented, when Ce4＋ doping content is 25% , the absorbing wavelength threshold value reaches the highest 520 nm. When the ratio is 15% , the degradation rate reaches the highest 91.8% after 4 h irradiated by sunshine. These crystal phases determine the light response curve and photocatalytic degradation.