New Route Synthetic Functionalized Porous Materials And Their Catalytic Applications

In recent years,porous materials have attracted more and more attention due to its excellent characteristics and potential applications.Porous materials usually have rich pore structure,larger porosity and specific surface area and lower skeletal density,widely used in adsorption,separation,catalysis,capacitors,optoelectronics and drug delivery,immobilized enzyme vectors and other life sciences field.In this paper,SiO₂-TiO₂ composites,pyridine nitrogen doped porous organic polymer materials and mesoporous organic silicon materials were prepared by three novel synthesis methods.In chapter 1,the paper summarizes the development of porous materials,combined with the formation mechanism and synthesis method of porous materials,the research goal and significance of this paper are proposed.In chapter 2,the reagents and instruments required for the experiment were introduced,and the synthesis process,characterization method and performance testing process of the materials were described.In chapter 3,the use of silicon and titanium precursor and block copolymer template?F127,P123?for self-assembly,mesoporous SiO₂-TiO₂ composite was obtained with visible light activity and carbon-doped after hydrothermal treatment at180?and removing the templates.The obtained material form a highly ordered mesoporous structure and high crystallinity TiO₂ dispersed.SiO₂ and TiO₂ form a stable"brick and motar"structure,so as to effectively prevent the TiO₂ from easily collapsing and sintering.XPS spectra confirmed that C atoms were doped into the TiO₂ lattice under high temperature and hydrothermal conditions to make them have visible light activity and showed good activity in visible light degradation of organic pollutants.In chapter 4,pyridine-doped porous organic polymer was obtained by solventhermal polymerization of divinylbenzene and 4-vinylpyridine.It has a large specific surface area and rich mesopore-macroporous structure.By adjusting the content of 4-vinylpyridine,the nitrogen content and the porosity of the material can be controlled.At the same time,the abundant pyridine nitrogen makes the material have high selective adsorption to CO₂,load-bearing metals allow for the conversion of CO₂into useful chemicals under mild conditions.In chapter 5,the templates and?-mercaptopropyltrimethoxysilane and tetramethoxysilane were self-assembled under solvent-free high temperature condensation to obtain sulfonic acid functionalized mesoporous silica SMS-xs.The material has a large specific surface area,highly cross-linked framework structure and abundant wormhole mesopores.The regulation of the amount of organosilicon can control the content of sulfur and the acidity of the materials.Ultra-high acid strength makes it show excellent catalytic performance and good reusability in biomass conversion and fine chemical synthesis.