▎ 摘　　要

NOVELTY - A graphene-based aerogel with asymmetric wettability is prepared by (1) adding a polyvinyl alcohol aqueous solution into graphene oxide aqueous dispersion liquid, stirring and ultrasonically obtaining uniform mixed dispersion liquid; (2) moving volume of mixed dispersion liquid into a corresponding size mold and freezing for a time, and carrying out freeze-drying to obtain graphene oxide/polyvinyl alcohol aerogel; (3) carrying out high-temperature carbonization treatment on graphene oxide/polyvinyl alcohol aerogel; and (4) carrying out hydrophilic modification on one side of carbonized aerogel to obtain graphene-based aerogel with asymmetric wettability. USE - Preparation of graphene-based aerogel with asymmetric wettability for efficient integrated separation of water-in-water and oil-in-oil emulsion (all claimed). ADVANTAGE - The method does not need chemical reducing agent and external energy powder introduction, has short time to obtain aerogel, and obtains aerogel with good mechanical strength. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the graphene-based aerogel structure.