▎ 摘　　要

The chemical and physical properties of graphene oxide (GO) would affect the performance of thin-film nanocomposite (TFN) membrane. In this study, the effects of size and layer number of GO on TFN membranes were studied. The larger the size of nanosheets, the more obvious the modification effect on the surface morphology of the TFN membrane, and the better the chlorine resistance of the TFN membrane. As the size of GO becomes smaller, the rejection and flux of TFN membrane are better. The decrease of GO' size could eliminate the phenomenon of flux perk and reduce the decrease of rejection of TFN membranes. And also, because of fewer defects and more lamellar channels, TFN membrane modified with multilayered GO has a higher rejection than GO-TFN membrane when the flux is similar. These results will be helpful to understand the separation mechanism of GO-TFN membrane and optimize the structure of functional layer.