▎ 摘　　要

NOVELTY - A nano fiber membrane is prepared by dissolving polyacrylonitrile (PAN) powder into dimethyl formamide (DMF) solution of graphene oxide (GO), agitating at room temperature for 30-50 hours to obtain uniform transparent PAN spinning solution containing GO, adding in disposable syringe at room temperature, fixing needle head of syringe on supply system of electrostatic spinning equipment, spinning to prepare composite nano fiber membrane GO/PAN, adding to chromium-containing waste water, reacting, testing concentration of chromium ion adsorption, and calculating adsorption amount. USE - Method for preparing nano fiber membrane used for removing heavy metal chromium ion in waste water (claimed). ADVANTAGE - The method is simple.