▎ 摘　　要

NOVELTY - Preparing biomass electret film involves dissolving biomass material in solvent to obtain biomass material solution; adding graphene oxide to biomass material solution, stirring and ultrasonically degassing to obtain biomass solution; pouring biomass solution into template, and using casting method to dry naturally to form film to obtain biomass film; equilibrating biomass film in constant temperature and humidity box for 20-28 hours; treating biomass film with constant temperature, then subjecting humidity to composite polarization to obtain biomass electret film. USE - Method for preparing biomass electret film used for radioactive aerosol purification (claimed). ADVANTAGE - The method for preparing biomass electret film is biodegradable; has high electricity storage performance; has simple operation, low cost and good application prospects.