▎ 摘　　要

NOVELTY - A full carbon composite film is prepared by selecting carbon nanotube as raw material, dividing into 2 portions, adding 1 portion with dispersant, ultrasonically treating to obtain carbon nanotube dispersion, dispersing graphene oxide in water to obtain graphene oxide dispersion liquid, adding in other portion of carbon nanotube, ultrasonically treating to obtain graphene oxide/carbon nanotube dispersion, orderly filtering carbon nanotube dispersion and graphene oxide/carbon nanotube dispersion by vacuum suction filtration, forming base layer in carbon nanotubes in carbon nanotube dispersion, forming barrier layer on base layer of graphene oxide/carbon nanotube in graphene oxide/carbon nanotube dispersion, forming upper layer by graphene oxide/carbon nanotubes and lower layer by preliminary all-carbon composite membrane of carbon nanotubes, drying preliminary all-carbon composite membrane, and thermal reduction treating in argon/hydrogen atmosphere. USE - Method for preparing full carbon composite film used in separating dye (claimed). ADVANTAGE - The method has strong preparation technique parameter controllability, and simple and easy operation. The product is highly effective in retaining dyes in water, and has good dye separating effect and strong bonding force between base film layer and blocking layer.