关键词: PMOs, 表面修饰, 氨丙基基团, 介孔结构

Abstract: Aminopropyl groups were used to functionalize the pore channels of periodic mesoporous organosilicas(PMOs) by the post-grafting method. The final materials were investigated by means of XRD, TEM, solid-state NMR, N₂ adsorption and Elementar Analysis. The results show that bridging groups in the framework do not cleave and amino groups are attached covalently to the pore wall of periodic mesoporous organosilica after functionalization. The mesoscopic order remains good with increasing aminopropyl groups coverage up to 25mol%. The surface area, pore volume and pore size tend to decrease as the concentration of APTMS increases, but the materials with 25mol% aminopropyl groups still preserve a desirable pore structure, with surface area of 604m ²·^-1, pore volume of 0.62cm³·^-1 and sharp pore size distribution centered between 4.5nm and 5nm. Aminopropyl-functionalized PMOs facilitates absorption of (HAuCl)-complex.

Key words: PMOs, terminal functionalization, aminopropyl-groups, mesoscopic pore structure