介孔二氧化硅空心球制备及改性的研究化学工程与技术专业论文.docxVIP

广东工业大学硕士学位论文Abs仃act 广东工业大学硕士学位论文 Abs仃act Hollow mesoporous silica possesses the characters of mesoporous materials，such aS high specific surface area，large pore size and pore volume，uniform pore size distribution and favorable stablity，and the hollow structure，which can accelerate the diffusion and adsorption of molecule，endow it with the ability of containing guest molecule．Thus，hollow mesoporous silica is an ideal supporter of catalyst，which caused the great interest of researchers． Through the soft—template method，this research using dodecylamine(DDA)and polyVinylpyrrolidone(PVP)as the combined template，and tetraethoxysilane(TEOS)as silica source，successfully synthesize the hollow mesoporous silica(HMS)with worm—like pore in the ethanol-aqueous system，whose surface area is up to 928 m29-1， and the pore size is 3 am．With characterization of small angle X-ray diffraction(Ⅺ①)， Scanning electron microscope(SEM)，Transmission electron microscope(TEM)，and N2 adsorption—desorption method(BET)，studying the effect of template and influence of synthesized condition on the surface morphology and pore properties，furthermore，the mechanism WaS illustrated logically．The results indicated that，temperature has significant effect on the Hydrogen bond in the self-assembly process，and the high temperature resulted in collapse of mesoporous structure，enlargement of pore size and the decrease of specific surface area；whereas，the different ethanol—aqueous ratio would lead to the change of interfacial tension，which influenced the particle size of HMS materials． Based on the synthesis of HMS，adding tetrabutyl titanate(TBOT)as titania source， finally the hollow mesoporous composite Si02-Ti02(HMTS)was synthesized．The result showed that，HMTS materials possessed not only mesoporous structure of Si02 but also anatase Ti02，and that they are connected by the Si一0-Ti bond．However，the self-assembly process between precursor and template was influenced by the the excessively fast hydrolysis rate of