海绵状纳米结构TiO2膜的制备及其光催化活性

采用电化学阳极氧化法在钛表面构筑了海绵状纳米结构TiO2膜. 应用扫描电子显微镜(SEM)和X射线衍射(XRD)对膜层的形貌和晶型进行了分析和表征, 考察了阳极氧化时间对膜层厚度的影响, 并通过海绵状纳米结构TiO2膜对甲基橙的光催化降解研究了膜层厚度与光催化活性的关系. 结果表明, 海绵状纳米结构TiO2膜对甲基橙具有光催化降解作用, 而且随着膜层厚度的增加, 光催化降解速率显著增大, 厚度为2.2 μm的海绵状纳米结构TiO2膜对甲基橙的光催化降解速率是厚度为480 nm的6.4倍.

Fabrication of a Spongelike Nanostructured TiO_2 Film and Its Photocatalytic Activity

A spongelike nanostructured titanium dioxide (TiO_2) film was fabricated on a titanium substrate by electrochemical anodic oxidation. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) experiments were performed to characterize the morphology and crystalline phase of the spongelike nanosturctured TiO_2 films. The effect of anodizing time on the thickness of the layers was examined. The relationship between the thickness of the spongelike nanostmctured TiO_2 film and its photocatalytic activity was investigated by the degradation of methyl orange solution.Results showed that the spongelike nanostructured TiO_2 film had a high photocatalytic activity. The photocatalytic degradation rate of a methyl orange solution increased with the film thickness. The photocatalytic degradation rate by the spongelike nanostmctured TiO_2 film with a thickness of 2.2 μm was 6.4 times as large as that by the spongelike nanostructured TiO_2 film with a thickness of 480 nm.