Preparation and Photoelectric Properties of TiO2 Nanotubes
TiO2 nanotubes with a thickness of 1 nm and a diameter of 15 nm were successfully prepared by hydrothermal method.The structure of the product was characterized by differential thermogravimetric analysis,X-ray diffraction,transmission electron microscopy and UV-Vis diffuse reflection spectroscopy.The photocatalytic activity of the product was evaluated by the degradation effect of TiO2 nanotubes on methyl orange.The results show that the synthesized TiO2 nanotubes have two crystal forms:anatase and rutile.The reaction time has a great effect on the structure and photocatalytic activity of the samples,and the ratio of rutile decreases with the increase of reaction time.When the reaction time was 12 h,the photocatalytic activity of TiO2 nanotubes was the best because of its better crystal structure and morphology.The formation mechanism of TiO2 nanotubes was studied.It was found that the precursor of TiO2 was formed under the action of strong alkali.Then,the lamellar structure is changed into a more stable nanotube structure induced by many factors such as surface electrostatic action and elastic deformation.
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