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利用添加了嵌段共聚物P123、F127及硝酸的双氧水溶液直接氧化钛金属基体制备不同纳米形貌TiO2光催化薄膜。采用X射线衍射(XRD)、扫描电镜(SEM)、紫外-可见漫反射光谱(UV-VisDRS)等技术分析样品的微观结构和形貌,以光催化降解若丹明B测定薄膜的光催化性能。结果表明,Ti-H2O2反应体系中仅添加嵌段共聚物的薄膜结晶呈树枝状,加入硝酸后薄膜形成纳米花结构。450oC热处理后,薄膜为锐钛矿与金红石的混晶结构,平均晶粒尺寸在12～20nm之间。薄膜的间接禁带宽度为2.65～2.85eV,显著低于TiO2块体。添加P123获得的薄膜的光催化性能优于添加F127的薄膜。
TiO2 photocatalytic films with different nano-morphology were prepared by direct oxidation of titanium metal matrix with hydrogen peroxide solution containing block copolymers P123, F127 and nitric acid. The microstructure and morphology of the samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-vis diffuse reflectance spectroscopy (UV-VisDRS). The photocatalytic degradation of rhodamine B . The results show that the film of Ti-H2O2 reaction system with only block copolymer added is dendritic and the nanoflower structure is formed by the addition of nitric acid. After heat treatment at 450oC, the film is a mixed crystal structure of anatase and rutile with the average grain size of 12 ~ 20nm. The indirect band gap of the film is 2.65 ~ 2.85eV, which is significantly lower than that of TiO2 bulk. The photocatalytic performance of the film obtained by adding P123 is better than that of F127 film.