Research Of Mesoporous Material Based On Hydrogrnated Silica

Mesoporous hydrogenated silica(HPMS)is a new mesoporous silica material,which not only has the traditional mesoporous silica with large specific surface area,specific pore volume and good hydrothermal stability,etc.,but also has a unique three-three Network structure,the existence of this structure to maintain the structural stability based on the hydrogen bonding between a small number of Si-H bonds and Si-OH bonds within the HPMS,while the remaining large number of Si-H bonds can be used as active sites for various reactions,Which provides a new breakthrough point for the study of mesoporous silica.In this paper,we conducted a series of studies based on HPMS,including the grafting of polymers onto HPMS surfaces by pyrolysis,the introduction of functionalized groups inside the mesoporous structure by copolymerization and the synthesis of HPMS composite particles.These studies can effectively improve the physicochemical properties of HPMS,extend its application range,and have great significance for the application and development of mesoporous materials.The main contents of this paper are as follows:(1)Surface functionalization based on polymer pyrolysis grafting(Chapter 2): By utilizing the properties of polymer PMMA and PS depolymerization at high temperature and the interaction between polymer molecules and SiH bond The polymer modified to the surface of HPMS in one step,the hydrothermal stability and mechanical stability of organic functionalized ordered mesoporous silica will be improved and hydrophobic;(2)Based on the copolymerization(Chapter 3): The methyl and vinyl groups were introduced into the HPMS via copolymerization.The functionalization rate of the copolymerization was increased to 80% under the premise of maintaining the mesoporous structure,breaking the It has been reported that the graft copolymerization method has a limit of 25%.(3)Preparation of in-situ reduced gold nanoparticles: The reducibility of gold ions by Si-H bonds in HPMS structure with thiol functionalization and-SH A large number of Au-HPMS composite particles were synthesized by the strong adsorption of gold nanoparticles.The catalytic activity of p-nitrophenol was studied.