Based on the synthesis of super hydrophobic silicic xerogel (SG) from methyltrimethoxysilane (MTMS) and dimethyldimethoxysilane (DMDMS), siliceous hydrophobic nanoparticles were fabricated within the mesoporous channels of SBA-15, in order to enhance the efficiency of adsorbing tobacco specific N-nitrosamines (TSNA) in aqueous solution. The concentration of precursor solution was adjusted to master the distribution of hydrophobic particles and the mean hydrophobicity of resulting composite, 150% increasing the capacity of SBA-15 in liquid adsorption of TSNA.