▎ 摘　　要

NOVELTY - Method for preparing nano-film involves (a) dissolving polyacrylonitrile powder in dimethylformamide solution-containing graphene oxide, stirring at room temperature for 30-50 hours to obtain a uniform and transparent polyacrylonitrile spinning solution-containing graphene oxide, (b) placing the prepared mixed spinning solution in a disposable syringe at room temperature, fixing the injector with the needle on a supply system of the electrostatic spinning equipment and carrying out spinning to obtain a graphene oxide or polyacrylonitrile composite nano-film and (c) adding the composite nano-film to mercury-containing wastewater, reacting at room temperature, testing the concentration of mercury ion solution before and after adsorption and calculating the adsorption quantity. USE - The method is useful for preparing nano-film for removing heavy metal mercury ions from wastewater. ADVANTAGE - The method is simple operation.