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采用溶胶-凝胶浸渍提拉法分别在氧化硅和石英衬底上制备了Ce4+掺杂的二氧化钛(TiO2)薄膜,在800℃的退火温度下保温30min。采用X射线衍射仪(XRD)、扫描电镜(SEM)及紫外-可见分光光度计,对TiO2薄膜的结构和光催化性能进行了详细分析,并且进行了对甲基橙的降解实验。研究结果表明:掺杂后的薄膜由锐钛矿向金红石的相转变温度升高。随着掺杂浓度的升高,薄膜经历了由颗粒粒度分明转变到薄膜形成好、未出现明显颗粒的过程,且Ce4+掺杂摩尔百分数为10%的薄膜形成较好。随着Ce4+掺杂浓度升高,TiO2薄膜的光吸收峰先红移再蓝移,紫外区吸收范围先增大后降低。掺杂后薄膜对甲基橙降解率均得到提高,而掺杂10%降解率最大。
Ce4 + doped TiO2 thin films were prepared on silicon oxide and quartz substrates respectively by sol-gel dip-pull method and annealed at 800 ℃ for 30 min. The structure and photocatalytic activity of TiO2 thin films were analyzed in detail by X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-visible spectrophotometer. The degradation of methyl orange was also studied. The results show that the phase transition temperature of the doped film from anatase to rutile increases. With the increase of the doping concentration, the film undergoes the transition from the granularity of the grain to the formation of the thin film with no obvious grains appearing, and the thin film with Ce4 + doping mole percentage of 10% is better formed. With the increase of Ce4 + doping concentration, the light absorption peak of the TiO2 thin film firstly red-shifted and then blue-shifted, and the UV absorption range first increased and then decreased. After doping, the degradation rate of methyl orange was increased, while the degradation rate of doped 10% was the highest.