Synthesis and Photoelectrocatalytic Property of Two-Nonmetal-Codop ed TiO2 Nanotube Arrays with High Aspect Ratio

摘要

Electrolyte containing F-was employed to conduct two-step anodic oxidation.Through adjustment of the composition of electrolyte,TiO2 nanotube array with high aspect ratio was grown in situ on Ti matrix,and meanwhile the binary doping with non-metallic elements,namely,F and S,was achieved.Using FSEM,XRD and EDS,the characterization on the topography,structure and doped elements of TiO2 nanotubes were performed.Taking methyl orange as the target degradation substance and using xenon lamp to simulate natural lighting,the comparison between the doped non-high-aspect-ratio nanotube and the doped high-aspect-ratio nanotube was made to investigate the related photoelectrocatalytic property.The results showed that the photoelectrocatalytic property of doped nanotube with high aspect ratio was significantly superior to that with non-high aspect ratio.The mixed crystal ratio ofanatase and rutile obtained after calcination for 2h at 500°C enabled higher photoelectrocatalytic activity of TiO2 nanotube array.