The synthesis and hydrothermal stability of directly usable hexagonal mesoporous silica by efficient primary amine template extraction in acidified water

摘要

High quality HMS can be repeatedly and reproducably prepared by a novel extractionprocedure to remove the primary amine template using acidified water. This very efficientextraction (100%) does not affect the physical properties of the resulting mesostructure.Compared to the ethanol-extracted HMS, no subsequent calcination step is required toremove the surface ethoxy groups produced during the ethanol extraction. Moreover, therecovered surfactant can be easily re-used in a fresh synthesis. Furthermore, a remarkableimproved hydrothermal stability was observed after using the acidified water extractionprocedure.