The Preparation And Properties Research Of Mesoporous Titania And Zirconia

Since the MCM-41 molecular sieve has been prepared by the scientists of Mobil Oil successfully in 1992, the preparation and application of mesoporous materials has been the focus of research. At present, the emphasis has been transferred to the mesoporous transitional metal oxide because of their special physical and chemical properties, such as photo-catalytic activity and semiconductivity etc. In this paper, we will introduce the synthesis and their properties research of mesoporous titania and zirconia at two independent systems.1. Mesoporous Titania SystemIn this system, we have synthesized mesoporous titania successfully in the UV-assisted sol-gel method. The results of relational charactering have revealed that the samples prepared by UV-assisted method show many advantages when compared to the samples prepared by traditional methods. The first is that the samples possess better catalytic property and they can degradate the RB solution absolutely in less time. The second is that the samples possess lower light-electronic response ability and it is just said that the sample can response to the long-length wave. The third is that the samples show an obvious absorption to the visible light. All the above results suggest that the samples maybe possess visible-light degradation ability. If this hypothesis is true, it will calculate the speed of the exploitation of the solar energy.2. Mesoporous Zirconia SystemIn this system, we have synthesized mesoporous zirconia with excellent properties through an adjusted templating method. This method itself shows many advantages, such as soon, green and economical etc. About 7-20 days are needed by the traditional method in synthesis of mesoporous zirconia, but when taken our anhydrous synthesis method the time needed is just only 3-6 hours. On the other hand, only the precursor, template and the solvent are needed during the synthesis of mesoporous zirconia in this new method and there are no stabilizer or inorganic acid in the reactive system which is used to reduce the hydrolytic speed of the precursor and to improve the thermal-stable ability of the resulted-product. The samples prepared by anhydrous synthesis method show excellent thermal stability and adjustable pore size. When they are calcinated in 700ç™± for two hours, the pore still remains completely. When the molar rate of the template to the precursor is changing between 0 and 1.0, the pore size shows an increasing trend with the adding of more template.