TiO_2纳米管阵列的制备及其光催化性能研究

采用阳极氧化法在钛箔上制备了TiO_2纳米管阵列,利用场发射扫描电子显微镜(FSEM)、X射线衍射仪(XRD)和紫外-可见分光光度计对TiO_2纳米管的形貌、结构和光学性能进行表征,详细考察了阳极氧化工艺参数对纳米管阵列形貌的影响,探讨了氧化钛纳米管阵列的形成机理,并对其光催化活性进行了测试,研究结果表明:在0.5 wt% HF和1 mol/L H3PO_4电解液中,控制氧化电压为20 V,反应60 min后,在钛箔表面可获得垂直导向的TiO_2纳米管阵列,管内径为60~80 nm,管壁厚约10 nm;600 ℃热处理后的TiO_2纳米管阵列薄膜对349.7 nm近紫外光和443.9 nm可见光有较强的吸收能力;煅烧温度对纳米管的晶型结构和光催化活性有显著影响.

Preparation and Photocatalytic Properties of TiO_2 Nanotube Arrays

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.