▎ 摘　　要

NOVELTY - Preparing composite film layer comprises e.g. preparing graphene oxide solution with specific water-to-alcohol volume ratio, dissolving zinc nitrate and 2-methyl imidazole in methanol, mixing, adding graphene oxide solution into mixed solution of above two solutions, mixing, centrifuging, washing, drying to obtain ZIF- 8/GO composite material powder, preparing composite material powder suspension by ultrasonic vacuum filtering technology and combining dispersed ZIF-8 /GO suspension and polyether imide modified micro-porous filtering film to obtain ZIF-8/GO composite material film layer. USE - The method is useful for preparing composite film layer. ADVANTAGE - The method: has simple operation; and is economical, easy to recycle and repeatedly used. DETAILED DESCRIPTION - Preparing composite film layer comprises preparing graphene oxide solution with specific water-to-alcohol volume ratio, dissolving zinc nitrate and 2-methyl imidazole in methanol and mixing, and then quickly adding the graphene oxide solution into the mixed solution of above two solutions, uniformly stirring and mixing, centrifuging, washing and drying to obtain ZIF- 8/GO composite material powder, then preparing composite material powder suspension by ultrasonic vacuum filtering technology and combining the dispersed ZIF-8 /GO suspension and polyether imide modified microporous filtering film to obtain different thickness of ZIF-8/GO composite material film layer