▎ 摘　　要

This study reports a new method of purifying graphene oxide (GO) through the addition of cationic surfactants. In this process, the cationic surfactant, (benzyl dimethyl hexadecyl ammonium chloride), was added to GO/H2SO4 mixture. Then the GO* (GO coupled with the cationic surfactant) becomes lipophilic. When CH2Cl2, a lipophilic solvent, was added to the mixture, the GO* migrated to CH2Cl2 phase, and resulted in a two-phase system consisting of H2SO4 + water + KMnO4 -phase, and GO* + CH2Cl2 -phase. The GO* was separated from GO* + CH2Cl2 mixture by drying and then subsequently converted to reduced-GO by thermal reduction. After purification, GO* and polystyrene (PS) nano composites were fabricated by polymerization, solvent mixing and melt mixing. It was found that nanocomposites with surfactant treated GO* exhibited better dispersion in PS than conventional-GO and reduced-GO and demonstrated improved barrier properties in non-polar solvents.