Abstract
Vesicular silica was synthesized using tetramethylorthosilicate[Si( OCH3)4,TMOS] as silica source and P123( EO20PO70EO20) as the structure-directing agent in phosphate buffer solution( p H = 6).Then,P123 was removed by extraction with ethanol. The synthesized siliceous materials were characterized by scanning electron microscopy( SEM),transmission electron microscopy( TEM) and N2 sorption isotherm. The results indicated that all the samples have a good dispersibility and vesiclar structure with a high specific surface area and a large pore volume. The adsorption and desorption performance of vesicular silica under static( for water vapor,n-hexane and 93# gasoline) and dynamic( for n-hexane) conditions were investigated with commercial silica gel( SG) and activated carbon( AC) as reference. The densities of surface hydroxyl group were determined by Boehm titration,which are linear to the corresponding water vapor adsorption capacities.The synthesized vesicular silica showed higher static adsorption capacity for n-hexane and 93 # gasoline with good stability,higher dynamic adsorption capacity and stable breakthrough time under dynamic adsorption conditions.
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