▎ 摘　　要

NOVELTY - A nanocarbon separation membrane (10) comprises more than 0 %mass and 15 %mass or less graphene oxide components (1) which are provided in a mutually overlapping manner when viewed from thickness direction and are crosslinked together by divalent cations, and 85 %mass or more and less than 100 %mass multilayer graphene component having thickness of 1-30 nm, which are inserted between the layers of the graphene oxide components. USE - Nanocarbon separation membrane is used for composite separation membrane (claimed) used in treatment of water and separation of gas. The separation membrane is ultrafiltration membrane, nanofiltration membrane, reverse osmosis membrane, forward osmosis membrane and water treatment membrane. ADVANTAGE - The nanocarbon separation membrane has excellent separation performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) nanocarbon composite separation membrane, which comprises a porous membrane (30) which is arranged on one surface side of the nanocarbon separation membrane and supports the nanocarbon separation membrane; and (2) manufacture of nanocarbon separation membrane, which involves coating and drying dispersion liquid in which the graphene oxide components and multilayer graphene components are dispersed, forming a carbon film, and immersing the carbon film in solution in which the bivalent cation is dissolved. DESCRIPTION OF DRAWING(S) - The drawing shows an isometric schematic view of the nanocarbon composite separation membrane. Graphene oxide component (1) Multilayer graphene component (2) Nanocarbon separation membrane (10) Contact bonding layer (20) Porous membrane (30)