The Preparations And Performances Of Porous Silica And Silica Loaded By ZnO

Porous material:The porous material is a material composed of a network structure of interconnected or closed pores. Porous materials have pores smaller pores, mostly nanoscale.With the development of society, and the progress of science and technology, people found large amounts of porous silica exists in rice husk. Most of the studies mentioned in the literature are nanosilica, mentioned less aspects of their porous structure. This paper is based on a method of rice husk as raw material for the preparation of porous silica:immersed in deionized water, boiled in10%dilute nitric acid, dried, and selecting the differently pyrolysis temperature and the same holding time, porous silica can be obtained. Analyzing the morphology, the particle dispersion of silica particles obtained in the experiment by XRD、SEM、Laser particle size analysis and so on, and the results shows that pyrolysis temperature of650℃, insulation of9h are optimal experimental conditions of the preparation for porous silica. Particle dispersion of this sample is the best, particles are uniform, the structure is amorphous.But porous silica also has some flaws, such as the weak degradability. The degradability of ZnO is very good. In order to improve the property of SiO2, ZnO has been loaded on it. In this way, the degradability of SiO2is improved, and added the application of it.In this paper, solution of ZnCl2is mixed with SiO2, and then droped NH3·H2O into it. Research and compare the impaction of ZnO on the degradability of SiO2by analyzing SiO2/ZnO of different proportion. Characterize the samples by XRD、SEM、 Spectral sub meter and so on, and assess the degradability of samples. The results show sample6is the best. In this case the sample obtained, the degradability is relatively stable and can ensure a high degradation rate.