摘要
通过研磨-焙烧法制备了YFeO3/TiO2异质结材料,考察了焙烧温度和组分质量含量变化对合成异质结材料的影响;进行了X射线衍射(XRD)、傅里叶红外(FTIR)、紫外-可见漫反射(UV-vis/DRS)、光电子能谱(XPS)等表征并测试了不同样品光催化降解橙黄II的活性。结果表明,YFeO3/TiO2复合氧化物不仅具有明显的可见光光响应,而且表现出比单组分相对较高的光催化降解活性。最佳的复合样品为600℃焙烧下,w(TiO2)=0.9的复合样品。复合材料光催化活性的提高可归因于p-YFeO3与n-TiO2间存在的p-n结。
YFeO3-TIO2 heterojunction semiconductors were prepared by milling-annealing method. Effects of structure and surface phase by annealing temperature and constitute content were investigated. The physical and photophysical properties of heterojunction semi- conductors were characterized by X-ray diffraction （ XRD ）, UV-visible diffraction （ UV-vis/DRS ） , and X-ray photoelectron spectroscopy （XPS）. The results showed that the presence of p-n junction not only had visible light harvesting but also potential force for hole-electron pair separation. A preliminary investigation of photodegradation effect on Orange II showed that the YFeO3-TiO2 heterojunction semiconductors exhibited better photocatalytic properties than the single phase of YFeO3 or TiO2. The obviously improved photocatalytic performance of YFeO3-TiO2 was ascribed mainly to the electric-field-driven electron-hole separation attributing to the p-n heterojunction. The ideal heterojunction semiconductor composition was w （ TiO2 ） = 0.9 sample calcined at 600 ℃.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2009年第2期218-222,共5页
Journal of the Chinese Society of Rare Earths
基金
中国博士后科学基金(20070420971)资助项目
