▎ 摘　　要

NOVELTY - Preparation of nano fiber filter involves dissolving polylactic acid particles in solvent to obtain polylactic acid solution, dispersing graphene oxide in N,N-dimethylformamide to obtain graphene oxide dispersion, adding graphene oxide dispersion to polylactic acid solution, stirring, ultrasonically degassing to obtain graphene oxide/polylactic acid mixed spinning solution, using graphene oxide/ polylactic acid mixed spinning solution in electrostatic spinning device, spraying on the composite film material, separating the composite film material from the receiving substrate to obtain graphene oxide/polylactic acid spinning film, drying the spinning film, placing the dried spinning film in a silver nitrate solution, adding reducing agent (A), reacting, adding chloroauric acid solution, adding reducing agent (B) was in drops to obtain film material with alloy nanoparticles grown on the surface, removing the film material, drying and placing in a constant temperature and humidity box. USE - Preparation of nano fiber filter for preparing cigarettes (all claimed). ADVANTAGE - The method produces nano fiber filter having adjustable shape and structure. The nano fiber filter is coupled with specific adsorption ability of graphene oxide/polylactic acid material and gold-silver alloy nano-catalytic damage reduction ability, and has controllable performance parameters, which reduces the release of harmful components in the smoke particles and gas phase of cigarettes. DETAILED DESCRIPTION - Preparation of nano fiber filter involves dissolving polylactic acid particles in solvent to obtain polylactic acid solution, dispersing graphene oxide in N,N-dimethylformamide to obtain graphene oxide dispersion, adding graphene oxide dispersion to polylactic acid solution, magnetically stirring, ultrasonically degassing to obtain graphene oxide/polylactic acid mixed spinning solution, using graphene oxide/ polylactic acid mixed spinning solution in electrostatic spinning device, spraying composite film material having micro-nano fiber structure, separating the composite film material from the receiving substrate to obtain graphene oxide/polylactic acid spinning film, drying the spinning film, placing the dried spinning film in a silver nitrate solution for adsorption, adding reducing agent (A), reacting for 10-15 minutes, adding chloroauric acid solution, raising the temperature to 60-90 degrees C, adding reducing agent (B) was in drops to obtain film material with alloy nanoparticles grown on the surface, removing the film material, drying and placing in a constant temperature and humidity box at 20-30 degrees C under relative humidity of 55-65%. An INDEPENDENT CLAIM is included for usage method of micro-nano fiber filter, which involves implanting nano fiber filter in a cigarette filter rod, wrapping with a molding paper to form a cigarette harm reduction mouth stick and connecting to prepare harm reduction cigarette.