Fabrication of self-organized TiO2 nanotubes by anodic oxidation and their photocatalysis
(College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)
Abstract: Self-organized TiO2 nanotubes were prepared on titanium foils at anodizing voltage of 20V in 0.5% HF solution for 2030min in order to provide a novel high-efficiency photocatalyst. And the resulting TiO2 nanotubes, in periodic ring structures around their exteriors, are open on the top, while closed on the bottom. After annealing for 3h in ambient atmosphere, the anatase phase was found, with the increasing content, in the originally amorphous TiO2 nanotubes treated at 350, 400 and 450℃; whereas the rutile phase emerged at 500℃, and the nanotube architecture could be preserved till 550℃. Furthermore, TiO2 nanotubes, fabricated at anodizing voltage of 20V for 20min and then annealed at 400℃, possesses the best photo-catalytic activity, i.e. the decolourisation of methyl orange irradiated for 40min is 99.6%. 更多
Key words: anodic oxidation； TiO2 nanotubes； annealing treatment； photo-catalytic activity； methyl orange