▎ 摘　　要

NOVELTY - A modified polyvinylidene fluoride film preparing method involves preparing graphite by the modified Hummers method and removing by ultrasonic stripping and freeze-drying to obtain graphene oxide. The graphene oxide is dissolved in polyethylene glycol with an aqueous ethanol solution, stirred and heated to obtain a material B. The material B is added with butyl titanate and sulfuric acid to absolute ethanol, cooled, centrifuged and washed and mixing with dimethylformamide aqueous solution, hydrothermal reaction, centrifuged and washed to obtain composite photocatalyst. The composite photocatalyst is mixed with dimethylacetamide, ultrasonicizing, followed by adding a porogen, continuing the ultrasonication, adding polyvinylidene fluoride, standing defoaming to obtain a casting solution, scraping the film, pre-evaporating and immersing mixture in deionized water and allowing to stand to obtain the finished product. USE - Method for preparing modified polyvinylidene fluoride film. ADVANTAGE - The method enables preparing modified polyvinylidene fluoride film with anti-pollution performance, obvious degradation effect and long service life.