Abstract
TiO 2 nanotubes (NTs) in powder form were synthesized by a facile electrochemical process in a perchlorate-containing electrolyte. Transmission electron microscopy results indicate that the TiO 2 NT-powder is in an amorphous structure and has outer diameter of 20 nm and tube-wall thickness of 5 nm. X-ray diffraction analysis reveals that phase composition of the annealed TiO 2 NT-powders is related to the heat treatment scheme. Methyl orange was employed as a representative dye pollutant to evaluate the ultraviolet photocatalytic activity of the TiO 2 NT-powders. It was found that different post heat treatment schemes affect greatly the photocatalytic activities of the TiO 2 NT-powders, which should be ascribed to the changes in phase structural and morphological properties of the TiO 2 NT-powders. These results indicate that there should be a balance between crystal phase and nanotubular configuration for achieving the best photocatalytic activity of the TiO 2 nanotube powders.
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