Recrystallization of microporous MFI type zeolite from SBA-15/carbon composite

Silica-directed synthesis of the nanostructured carbon materials always requires the selective removal of the template silica from the silica/carbon composites by using harmful hydrofluoric acid, posing significant environmental concerns as well as the additional cost for the special reactor design and waste treatment. In this work, instead of discarding the silica waste, the transformation of the sacrificial silica waste into more useful silica materials such as zeolites has been sought. The dissolved silica solution, otherwise troublesome harmful waste, was then allowed to be recrystallized with TPABr through hydrothermal process under the alkaline condition to generate MFI type zeolite, which is one of the most important classes of zeolites. Thus, the current recrystallization method would be attractive as a useful replacement of troublesome costly disposal of silica waste, rather producing useful functional nanoporous silicas from the silica waste materials, which can find many potential applications.

کلیدواژه ها:

MFI-type zeolite. ordered mesoporous carbon ، SBA-15 ، TPABr