(Department of Inorganic Materials, Central South University, Changsha, Hunan 4 10083)
This project is a national 863 project and a national natural science foundation project.
First, the content introduction
Toxic and refractory organic pollutants are highly toxic and exist in nature for a long time, so it is difficult to treat them with existing environmental technologies. Photocatalytic decomposition technology is the most effective and practical method at present. Organochlorine compounds, surfactants, pesticides, dioxins and other pollutants are mainly decomposed by TiO2 as a catalyst. Even if the concentration is very low, these pollutants can be effectively degraded into non-toxic substances by TiO2 catalyst. In Japan, the market industry of titanium dioxide catalyst has reached 2 trillion yen in 2005. The total number of patents on TiO2 _ 2 catalysis in Japan accounts for 92% of such patents in the world, and there are 3,000 industrialization teams, among which Toyota, Toto, Hitachi and Toshiba are the most active. The United States, Germany and many European countries have glass and lighting facilities using photocatalytic coatings and photocatalytic films. The development of photocatalytic technology is in the cross field of "nanotechnology" and "environmental protection", and the Ministry of Economy, Trade and Industry of Japan lists photocatalytic technology as one of the pillar industries for building the country through science and technology. China is also developing research in this field.
This project adopts the layered structure of layered silicate minerals, and its interlayer is composed of Si-O tetrahedron and Al-O octahedron, which has similar structural units to mesoporous materials. Mesoporous materials of silicon and aluminum were prepared by hydrothermal crystallization synthesis and structural rearrangement. The formation of silicon-aluminum skeleton structure improves the overall structure of mesoporous materials and significantly improves the thermal stability of materials. On this basis, the preparation of high performance silicate-based catalytic materials by assembling TiO2 _ 2 and mesoporous silica-alumina materials by chemical methods was explored. Monodisperse TiO _ 2 materials can be obtained with the help of nano-pores of mesoporous materials, which provides a new idea for improving the catalytic activity and stability of TiO _ 2 catalytic materials.
Second, popularization and application
Silica-aluminum mesoporous materials with stable performance, large pore size (> 3 nm) and large specific surface area (> 1000 m2/g) were prepared. Firstly, high-performance nano-TiO _ 2 catalyst was synthesized, and TiO _ 2 and mesoporous composite particles were prepared by chemical assembly. The design technology of catalyst structure based on quantum chemical energy band calculation is proposed, and efficient catalysts suitable for decomposition of typical organic pollutants are screened out, which has broad application prospects.
Three. Identification, awards and patents
The project has applied for six national invention patents.