Synthesis and characterization of bridged amine-functionalized mesoporous organosilica materials

The periodic bridged amine-functionalized mesoporous organosilica (BAFMOs) was synthesized by condensation of bridged silicon precursor 1,2-Bis(triethoxysilyl)-ethane (BTESE) and Bis(3-(methylamino)propyl)-trimethoxysilane (BTMSPMA) under acidic conditions with the aid of NaCl and ethanol. A triblock copolymer P123 was used as template. X-ray diffraction and transmission electron microscopy revealed that the resultant BAFMOs materials possess ordered mesoporous. N-2 sorption showed that the specific surface area gradual decreased, from 970m(2)/g to 795m(2)/g, whereas the average pore size increased, from 3.7 nm to 5.4 nm as the amount of BTMSPMA increased. C-13 CP MAS NMR and Si-29 MAS NMR confirmed the retaining of the Si-C as well as the existing of the amino in the silica skeleton. The analytical potential of the materials is demonstrated with separation of isomeric molecules in reverse phase chromatography mode compared with commercial C18 column.