▎ 摘　　要

NOVELTY - A nano-filtration membrane of graphene oxide is prepared by coating dispersion liquid containing graphene oxide on base film, using polyamine to crosslink graphene oxide, and using sodium hypochlorite to post-treat graphene oxide film after crosslinking. The polyamine is organic substances containing two amino groups and/or imino groups. USE - The method is used for preparing nano-filtration membrane of graphene oxide in decoloring waste water (claimed). ADVANTAGE - The method improves structure stability and performance stability of graphene oxide membrane, greatly improves flux of nano-filtration membrane, and keeps dye interception rate.