Fabrication Of Codoped TiO₂ Nanotube Array Film And Its Photocatalytic Activity

TiO₂ nanotube array were prepared by anodic oxidation,which have combined with solid, high ordered structure and low agglomeration, high quantum efficiency and so on.. In the photoelectric effect, the photoinduced electrons from the TiO₂ nanotubes into Ti substrate, thus greatly reducing the light the possibility of electron hole recombination, showing good photocatalytic activity. TiO₂ is large band gap (about 3.2 eV) can absorb only the ultraviolet (UV) light contained in a solar spectrum and the inability to utilize visible light . So how to improve the optical response of TiO₂ to the visible light is still a research hotspot in the field .In this paper, TiO₂ nanotube array films were prepared by anodic oxidation, and their modified optical properties as well as photocatalytic activity were studied. Specific contents are as follows:(1) TiO₂ nanotube array films were prepared by anodic oxidation in an ethylene glycol electrolyte containing NH₄F and investigated that the effects of oxidation parameters (bias, oxidation time, NH₄F concentration) on the morphology of TiO₂ nanotubes. Furthermore, Effect of calcination temperature and tube length on photocatalysis and photoelectrochemical properties of anodized titanium dioxide nanotube arrays.(2) The co-doping nitrogen and sulfur has been achieved in the TiO₂ nanotube array films by heated treatment with thiourea and calcination under vacuum. Under visible irradiation, through the degration methylene blue solution and photocurrent experimental tests show that the N and S co-doped TiO₂ nanotube films haved greater photocatalytic activity and bigger photocurrent.(3) The N-doped TiO₂/ MoO₃nanotube films were prepared by the TiO₂ nanotube film were ion sputtered of in the Mo the multi-function room, and heat treatment. XPS shows that the content of N element increased duing to Mo element incorporated. Under visible irradiation, through the degration methylene blue solution and photocurrent experimental tests show that the N-doped TiO₂/ MoO₃ nanotube films haved greater photocatalytic activity and bigger photocurrent than TiO₂ nanotube films.