Preparation And Research On Supported Nano-TiO₂ Photocatalyst

In recent years, as an important photocatalysis material, TiO₂ has been widely used and studied in the field of environmental photocatalysis, which includes the degradation of organic pollutants such as aromatics, olefms, explosives, dyes, pesticides and so on. With the emergence of nanometer material, studies on the photocatalysis properties of nanometer TiO₂ has become more and more important, especially in the preparation and study of supported nanometer TiO₂.Platinum is an important catalyst in the oil refining and petrochemical. Based on H₂PtCl₆·6H₂O and NaBH₄, Pt nanomaterials synthesized by Ultrasound-assisted chemical reduction. The effect of ultrasonic on the growth process of Pt nanomaterials was investigated. It was characterized by Ultraviolet visible spectrum(Uv-vis), transmission electron microscopy(TEM), TEM electron diffraction. Pt nanomaterials was prepared, which is spherical, size in 30-60 nm, and it has dendritic structure. Compared with previous methods, it exhibits advantages in simple source of raw materials, more moderate conditions, less impurities, and it studied a new process line of synthesis Pt nanomaterials.Studies on the effects of CI^- on photocatalysis properties of TiO₂ catalysts are significantly important, for Cl^- will be presented in the process of preparation and degradation of organic chloride. There are two viewpoints: one is that the passivation for catalyst is caused by Cl₂, which can be adsorbed in catalyst active site by the strong capacity of accepted electrons; the other is that Cl·can promote the Photocatalytic degradation process of the organic chloride. The effect of the load halogen elements on the oxidation process of propylene by nanometer TiO₂ photocatalyst has been studied in this paper. Three results have been abtained: Cl^- supported can promote the oxidation process, and Br₂ loaded plays no role in the oxidation process, while I₂ loaded can interpret the passivation of the oxidation process.For a long time, many researchers focus on the preparation of powder-catalyst, whose performance is better if whose size is smaller. However, it will bring great inconvenience and a huge waste, for it is more difficult to operate and recycling in the practical application. Fortunately, those shortcomings can be overcome by the deposition of photocatalysis films on the vector. This skill has an important role in actual application, especially for those expensive catalysts, because it can solve the problem of, improve utilization of supported catalyst and reduce waste. In this paper, we have successfully prepared Pt / glass catalyst and Pt-TiO₂/glass in the commom glass. Additionally, the effects of the two catalysts on oxidation of CO has been studied: pure Pt has little catalytic activity for the oxidation of CO; while the catalytic activity of Pt-TiO₂ is stronger than the activity of pure Pt, and the catalytic activity of Pt/TiO₂ performs better.