▎ 摘　　要

NOVELTY - A nanocarbon separation membrane (10) comprises graphene oxide materials (1) which are provided in a mutually overlapping manner, when viewed from the thickness direction and crosslinked together using divalent cations, and double-walled carbon nanotubes (2) inserted between the layers of the graphene oxide material. The mass ratio of the graphene oxide material with respect to the total amount of the graphene oxide materials and the double-walled carbon nanotubes, is more than 0 %mass to 70 %mass. The content of the double-walled carbon nanotubes is 30 %mass to less than 100 %mass. USE - Nanocarbon separation membrane. Uses include but are not limited to ultrafiltration membrane, nanofiltration membrane, reverse osmosis membrane, and forward osmosis membrane used in water treatment and gas separation. ADVANTAGE - The nanocarbon separation membrane has excellent water permeability and separation performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) nanocarbon composite separation membrane (100), which consists of the nanocarbon separation membrane, and a porous membrane (30) which is positioned 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 the dispersion liquid containing graphene oxide material and the double-walled carbon nanotubes, forming a carbon film, and immersing the carbon film in a solution containing bivalent cation. DESCRIPTION OF DRAWING(S) - The drawing shows an isometric schematic view of the nanocarbon composite separation membrane. Graphene oxide material (1) Double-walled carbon nanotubes (2) Nanocarbon separation membrane (10) Porous membrane (30) Nanocarbon composite separation membrane (100)