【摘要】 为了研究Ag含量对光催化效率的影响,采用电子束沉积方法制备了Ag-TiO₂光催化剂,分别用X射线衍射仪（XRD）,紫外-可见光谱仪（UV-Vis）,电子扫描显微镜（SEM）,原子力显微镜（AFM）,X射线电子能谱仪（XPS）等手段对晶体结构,光学性能和薄膜形貌以及元素价态元素组成等进行了表征.利用太阳光,以甲基橙（MO）为模型,分析了不同Ag含量薄膜的光催化效率.结果显示:Ag是以Ag⁰存在,Ag均匀而牢固的分布在TiO₂材料上;在300℃温度下,所形成的薄膜为无定形结构;沉积适量的银,可以提高纳米二氧化钛光催化活性。更多还原

【Abstract】 In order to study the effect of Ag content on photocatalytic efficiency,Ag-doped TiO₂ coatings were deposited by electron beam evaporation.The structural,optical,morphology and elemental compositions of the obtained nanocomposites were characterized using the X-ray diffraction（XRD）,ultravidetvisible（UV-Vis）spectrophotometer,scanning electron microscopy（SEM）,atomic force microscopy（AFM）and X-ray photoemission spectroscopy（XPS）,respectively.The photocatalytic activity of Ag/TiO₂ was measured by using photocatalytic oxidation of MO as a model reaction,and the effect of Ag concentration on the photocatalytic activity was investigated.It is found that the Ag is in the Ag⁰ state.The silver nanoparticles are uniformly distributed and strongly attached to the mesoporous TiO₂ matrix.The Ag-TiO₂ films is amorphous at 300℃.The photocatalytic activity of TiO₂ nanoparticles can be improved by depositing appropriate amount of silver.更多还原