Photocatalytic activity and analysis of TiO<sub>2</sub> nanotube arrays by anodization

In this study, TiO2 nanotube arrays were prepared by anodization. The photocatalytic activity was measured. The influence of diameter and length of the TiO2 nanotubes on the activity was discussed. The activity relates with the length, and the activity increases with the length to 9 μm. The reduction treatment in carbon powder was performed for TiO2 nanotube arrays. The activity was enhanced and visible light response of TiO2 nanotube arrays was obtained by the reduction treatment.