Preparation And Application Of TiO₂ Nanotubes

Nano TiO₂ is one of the important nanomaterials, because the particle of it has many qualities like surface effect, quantum size effect, small size effect, macroscopic quantum tunnel effect etc; while the crystals of it have properties like uv protection, visible through, color effect and photocatalysis; And also because of its chemical stability, nano-TiO₂ photocatalysis have been widely used in areas including environmental protection, cosmetics, ceramics, food anti-staling, which brings major changes to our lives. Therefore, its preparation and application becomes the focus of the whole world.In recent years, three main methods including templates, anodic oxidation method and hydrothermal method are taken by people to synthesize TiO₂ nanotubes. Among the methods mentioned above, using anodic alumina as a template of TiO₂ nanotubes preparation is taken comparably widely, but this technology of the process of the template preparation is complex, and generated nanotubes are directly depended on the shape and size of the template hole, the template and the nanotubes separation of nanotubes post-treatment technology often destroy the appearance of the nanotubes. Which can do harm to the basic characteristics of the study of nanotubes in engineering field and a large application . With hydrothermal method we use special airtight reaction containers, using aqueous as reaction media, through to the reaction tank heating, create a high temperature and high pressure response environment, make undissolved or insoluble substances dissolved and heavy crystallization.Hydrothermal method has several categories as hydrothermal oxidation, hydrothermal precipitation, hydrothermal reduction, hydrothermal crystallization, hydrothermal decomposition and hydrothermal synthesis. Among them, hydrothermal synthesis is the method that the solubility of some hydroxide is greater than that of the corresponding oxide under the circumstances of water, high temperature and high pressure. Therefore, hydroxide is dissolved in the water and simultaneous deposition of oxide is formed. The advantage of hydrothermal synthesis is that it can generate oxide directly, without the calcination, avoid hard reunion formation.In this article, we introduce our method to synthesize more high-quality TiO₂ nano materials through hydrothermal synthesis, we use orthogonal experiments to research the particle size and morphology under different thermostatic, different settlement time, different processing methods of materials , We use XRD, SEM, TEM and BET characterization, obtain technological parameters scope to produce TiO₂ nanomaterials with different size and morphology . We also analysis and explore the growth process and reaction mechanism of TiO₂ nanotubes according to the feasible chemical theory and according to the feasible chemical theory.In recent years, nuclear pollution has become a very important environmental issue to the whole world. TiO₂ nanotubes could be a very good kind of adsorbent due to its high surface area, large number of active sites, as well as the nanometer material properties, so we did a series of experiments with TiO₂ nanotubes to uranium, and obtained good adsorption effect.