TiO <sub> 2 </ Sub> Nanotube Arrays Preparation And Photocatalytic Characteristics

Mankind is facing an increasingly serious environmental pollution in civil, industrial, agricultural, military defense and other fields at present. As people's concern about environmental protection, photocatalytic materials have been hot spots in the science of materials and catalysis in recent years. TiO2 nanotube has stable, high efficiency catalytic, non-polluting and non-toxic characteristics. TiO2 nanotube has been attached great attention in degradation of toxic and refractory organic contaminants.However, TiO2 powder may cause secondary pollution. The fast recombination rate of photo generated electron-hole pairs and the low quantum yield of photochemical conversion for solar energy severely hinder the industrialized applications of TiO2 photo catalyst. In recent years, many attempts have been made to resolve above problems in the word. We improved the specific area and the photo catalytic activity of TiO2 nanotube arrays by anodization. The SEM, TEM, XRD and XPS were performed to characterize the effect of different factors on morphology, component and crystalline phase. We analyzed the mechanism and the influencing factors in growth of TiO2 nanotube. The nitrogen-doped TiO2 nanotube array is expected to boost the photo catalytic activity. The N-doped TiO2 nanotube array was characterized by SEM, XRD and XPS. The photo catalytic activity of the TiO2 nanotube array film was evaluated by the decolorization of methyl orange in aqueous solution. Some critical structure factors of TiO2 nanotube array film in the photo catalytic activity was discussed as well. Compare with TiO2 nanotube, the N-doped TiO2 had higher ratio by the decolorization of methyl orange. The results showed that the nitrogen-doped TiO2 nanotube elevation the photo catalytic activities greatly.