▎ 摘　　要

NOVELTY - Preparing composite nano fiber film involves preparing graphene oxide dispersion, preparing electrostatic spinning solution, adding the nanosilicon dioxide powder and polyacrylonitrile into the graphene oxide dispersion liquid obtained, heating and stirring, adding metal ion, mixing uniformly to obtain the electrostatic spinning solution. The mass percentage of polyacrylonitrile, metal ion and electrospinning solution is (10-15): (0.5-4.5): 100. The mass ratio of graphene oxide, nano-silica powder and polyacrylonitrile is (0.3-2):(2-6): 100. USE - Method for preparing composite nano fibre film for air filtering material. ADVANTAGE - The method enables to prepare composite nano fibre film with high efficiency and low inhibition of bacteria, is suitable for indoor air filtration and PM2.5 personal protection, and has good practical value. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a composite nano fiber film.