Fabrication And Modification Of Ti-nanotube Arrays And Its Photocatalytic Property

The environmental pollution is an important problem around the world. Nanometer TiO₂is one of the best photocatalytic materials. It has the advantages of high efficiency, non-toxicand chemical stablity. However, the conductivity of TiO₂is relatively low because of its only3.2eV band gap, and the drawback caused the low utilization of sunlight and the inefficiencytransmitting of the light-generated carriers, which resulted in low efficiency of thephotocatalytic. It is necessary to solve the above problems for the doped of TiO₂nanotubearrays, which can broade the range of absorption in the visible region and prolong thelifetime of light-generated carriers.In this paper, we have prepared highly ordered TiO₂nanotube arrays anodized on Tisubstrate, designed the Ag deposition on the TiO₂surface to obtained Ag/TiO₂nanotubesowing to its photocatalytic performance, and investigated the application of its photocatalyticactivity. The details are as follows:1. TiO₂nanotube arrays were prepared with the anodic oxidation mehod. The preparationprocess was simple and can be easily controlled. The structure of TiO₂nanotube arrays arehighly ordered in micron level. We have discussed the influence of the oxidation voltage,oxidation time and deionized water concentration on TiO₂nanotube morphology. The actionmechanism has also been discussed.2. The degradation experiment of methylene blue solution has been carried out to studythe influence of the structure and morphology of TiO₂annotates on their photocatalyticproperties.3. In order to improve the photocatalytic efficiency of the TiO₂annotates, Ag wasdeposited on the surface of TiO₂nanotube arrays by the photoreduction method. Thephotocatalytic properties of the modified TiO₂nanotube array films had been investigated.The experimental results show that the photocatalytic properties of Ag-doped TiO₂nanotubes have improved significantly...