高度有序的二氧化钛纳米管阵列的制备及其光催化活性的研究

采用电化学阳极氧化法在钛表面构筑了一种结构有序、微米级的TiO₂纳米管阵列膜层. 考察了制备电压、氧化时间、溶液搅拌等实验参数对TiO₂纳米管阵列形貌和尺寸的影响. 应用SEM和XRD对膜层的形貌和晶型进行了分析和表征, 并通过TiO₂纳米管阵列膜对甲基橙的光催化降解, 研究了TiO₂纳米管阵列膜层结构与光催化活性的关系. 结果表明: 阳极电压和溶液搅拌对制备TiO₂纳米管阵列的结构起到关键的作用. 控制20 V电压制备的TiO₂纳米管阵列膜, 管长达2.6～3.3 μm, 经500 ℃热处理后具有最高的光催化活性, 其光催化性能明显优于一般的TiO₂纳米颗粒膜.

Fabrication of Highly Ordered Titanium Dioxide Nanotube Array and Investigation of Its Photocatalytic Activity

A highly ordered titanium dioxide (TiO₂) nanotube array film on titanium substrate was fabricated by using an electrochemical anodic oxidation method, and some preparation parameters of the TiO₂ nanotube arrays were investigated as well. The SEM and XRD experiments were performed to characterize the morphology and crystalline phase of the TiO₂ nanotube arrays. It was found that the morphology of the TiO₂ nanotube arrays was greatly associated with the anodization voltage. The photocatalytic activity of the TiO₂ nanotube array film was evaluated by the decolorization of methyl orange under the illumination of a high-pressure mercury lamp. The results showed that the TiO₂ nanotube arrays prepared at 20 V and annealed at 500 ℃ exhibited the best photocatalytic activity to the degradation of methyl orange. And the photocatalytic activity of the TiO₂ nanotube array film was much higher than that of the regular TiO₂ nanoparticle film.