文摘
Mesoporous silicax2013;aluminosilicate composites have been successfully synthesized via a solx2013;gel process under acidic (pH 6.5) and basic (pH 11.5) conditions using cetyl trimethylammonium bromide (CTAB) as a template and chitosan as a domain size controller. The synthesized products were characterized by using Fourier Transform Infrared (FTIR) Spectroscopy, solid state 27Al CP/MAS NMR Spectroscopy, small angle X-ray Diffraction Spectroscopy (SAXS), nitrogen sorption measurement and Transmission Electron Microscopy (TEM). Through one-pot synthesis, the uniform infiltration of mesoporous aluminosilicate in mesoporous silica was formed under strong basic conditions (pH 11.5), while self-assembled corex2013;shell silicax2013;aluminosilicate composites having an ordered mesoporous silica core and mesoporous aluminosilicate shell were achieved under mild acidic conditions (pH 6.5). Moreover, mesoporous silicax2013;aluminosilicate composites of more uniform, smaller domain size and higher macroporosity were obtained when chitosan was applied.