▎ 摘　　要

NOVELTY - Preparing a composite fiber membrane involves adding graphene oxide to deionized water, and ultrasonically dispersing uniformly to obtain graphene oxide dispersion. The dopamine hydrochloride is added to the graphene oxide dispersion, and stirred uniformly. The pH is adjusted to 8-9 for reaction, filtered, washed, and dried to obtain polydopamine modified graphene. The polyvinyl alcohol is added to deionized water, heated and stirred to dissolve, to prepare polyvinyl alcohol solution. The polydopamine-modified graphene is added to the polyvinyl alcohol solution, and stirred uniformly to prepare a spinning solution. The spinning solution is electrospinned. The polydopamine modified graphene and polyvinyl alcohol nanofiber membrane is prepared, which is a composite fiber membrane. USE - Method for preparing a composite fiber membrane for heavy metal sewage treatment. ADVANTAGE - The method has large specific surface area, high porosity, large contact area, high adsorption capacity, and simple preparation method.