▎ 摘　　要

NOVELTY - Producing graphene membrane, comprises (a) oxidizing graphite powder to produce oxidized graphite powder, (b) preparing oxidized graphene flakes by ball milling and centrifuging the oxidized graphite powder, (c) dispersing the graphene oxide flakes in dispersion solvent to prepare dispersion, (d) mixing the dispersion with polymer to prepare oxidized graphene-polymer mixed solution, and (e) performing non-solvent-derived phase separation method to the oxidized graphene-polymer mixed solution. USE - The method is useful for producing graphene membrane. ADVANTAGE - The method provides graphene membrane having uniform pore size. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for graphene membrane comprising 80-90 wt.% multiple graphene flakes (110) arranged at predetermined intervals in planar shape and 10-20 wt.% polymer (120) connecting the multiple graphene flakes to each other, and pores (130) between the multiple graphene flakes which is not filled by the polymer. DESCRIPTION OF DRAWING(S) - The drawing shows a structure of the graphene membrane. Graphene membrane (100) Graphene flake (110) Polymer (120) Pore (130)