▎ 摘　　要

NOVELTY - Preparing a composite film for photocatalysis-photothermal film distillation comprises (1) dissolving cerium nitrate and urea in distilled water, pouring it into a reaction kettle, and performing a hydrothermal reaction at a certain temperature, washing product with ethanol and vacuum drying, cerium oxide nanoparticles were obtained, graphene oxide (GO) and dispersing in distilled water, introducing silver nitrate, stirring mixture at 1-2 hours, and introducing sodium citrate powder, placing in a water bath at 80-100 degreesC for 3-6 hours, cooling to room temperature, and centrifuging product, washing with distilled water, graphene oxide-silver nanocomposite obtained by freeze-drying; where cerium(IV) oxide nanoparticles and the graphene oxide-silver nanocomposite are mixed in obtain a composite photothermal photocatalyst, (2) introducing polyvinylidene fluoride (PVDF) powder into N,N-dimethylformamide solvent, heating to a temperature of 50-60 degreesC, and continuously stirring to dissolve for 2- 6 hours, obtaining PVDF spinning solution, and electrospunning spinning solution by electrospinning technology to obtain PVDF hydrophobic nanofiber membrane, (3) dispersing composite photothermal photocatalyst in a polyvinyl alcohol PVA solution, ultrasonically treating for 3-6 hours, pouring mixture into a spray gun, spraying on hydrophobic nanofiber membrane, drying by blower before coating, adjusting thickness of the coating according to the number of sprays, heating film at 150-180degrees C for 1-2 hours to cross-link PVA, and composite film for photocatalytic-photothermal film distillation was prepared. USE - The method is useful for preparing composite film for photocatalysis-photothermal film distillation. ADVANTAGE - The needed device is simple, the repeatability is high, and it has wide prospect in the water treatment field.