核-壳结构ZnO/TiO_2复合材料的制备及其光催化性能研究

Preparation and photocatalytic properties of core-shell structure TiO_2/ZnO nanocomposites

采用电化学阳极氧化法制得结构规则、有序的TiO2纳米管,以TiO2纳米管为基质,在一定水热条件下合成核-壳结构的TiO2/ZnO复合纳米材料。利用X射线衍射(XRD)、扫描电镜(SEM)、紫外-可见光谱(UV-VIS DRS)等分析手段对所得材料的结构、形貌及光催化性能进行分析和表征。实验结果表明:TiO2/ZnO复合纳米材料的光催化性能较单一TiO2、ZnO纳米材料有所提高。当前驱体溶液加入量为20 mL,甲基橙溶液初始pH为3时,TiO2/ZnO复合纳米材料的光催化效率最高。

Highly ordered TiO2 nanotube is fabricated by electrochemical anodic oxidation methods.Then the TiO2 nanotube is used as substrate in the preparation of TiO2/ZnO nanocomposites.XRD,SEM and UV-VIS DRS are used to characterize the as-obtained TiO2/ZnO nanocomposites.The results suggest that the photocatalytic property of TiO2/ZnO nanocomposites is more effective than single TiO2 or ZnO nanomaterial.The photocatalysis of TiO2/ZnO nanocomposites can be most effective when 20 ml precursor solution is added to the hydrothermal process and the pH of initial methyl orange solution is 3.