| 초록 |
Bissilylated urea (BU) bridged periodic mesoporous organosilica (BU-PMO) precursor have been successfully synthesized through co-condensation of 2,6-diaminopyridine and triethoxysilylpropyl isocyanate at 85 oC under N2 atmosphere for 24 hours. The bissilylated urea precursor has been utilized to prepare BU-PMO with various BU precursor to tetraethylorthosilicate (TEOS) ratios, using triblock copolymer (Pluronic P123) as a structure directing agent in acidic conditions. The surfactant was removed by solvent extraction method using 1% HCl-ethanol at 60 oC. The prepared PMO materials were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), FT-IR, N2 sorption, 29Si and 13C CP MAS NMR. The amine group of the bridged organic functionality was further modified using chlorosulphonic acid in chloroform solvent. Chemically functionalized materials were shown to be suitable for adsorption of metal cations from aqueous solution. |
