关键词: 阳极氧化;TiO_2纳米管;阵列;光催化活性

Abstract: Titania nanotube arrays were fabricated by anodic oxidation on a pure titanium sheet. The morphology, structure and optical properties of the nanotube arrays were characterized by FSEM,XRD and UV-Vis. The effect of anodic oxidation parameters on the morphology of TiO_2 nanotube arrays was investigated. The mechanism of the growth of the titania nanotube arrays was discussed, and the photocatalytic activity was tested. The results show that the vertical oriented TiO_2 nanotube arrays can be obtained at 20 V for 60 min in 0.5 wt;HF+1 mol/L H3PO_4 solution. The aperture size of nanotubes is 60-80 nm and the thickness of tube wall is about 10 nm. The spectral absorptivity of TiO_2 nanotube arrays membrane calcined at 600 ℃ on ultravlolet light 349.7 nm and visible light 443.9 nm was relatively higher. It was also found that the calcination temperature has an obvious effect on the crystal structure and photocatalytic activity of the titania nanotube arrays.