Abstract
Three kinds of organofunctionalized mesoporous silicas, including methyl-MCM-41, propyl-MCM-41 and octyl-MCM-41, were synthesized via one-step co-condensation and for the first time employed as the coatings of solid-phase microextraction fibers coupled with HPLC to extract dibutyl phthalate (DBP). The samples were characterized by fourier transform infrared, small-angle X-ray diffractometer, transmission electron microscope, thermogravimetry analysis and N-2 adsorption-desorption. The results showed that the organofunctionalized mesoporous silicas still preserve a desirable two-dimensional P6mm hexagonal structure with large pore volume, good thermal stability and strong hydrophobicity after introducing alkyl groups of various carbon chains to the framework of MCM-41. When the concentration of DBP in standard solution is 1.0 x 10(-9) mol L-1, the extraction efficiency of octyl-MCM-41, propyl-MCM-41 and methyl-MCM-41 is 5.7, 4.6 and 4.1 times higher than that of the pure MCM-41, respectively.