▎ 摘　　要

NOVELTY - A graphene oxide/metal organic framework composite membrane preparing method involves ultrasonically dispersing the graphene oxide in the organic solvent A to obtain a graphene oxide dispersion, adding the metal salt A to the graphene oxide dispersion, and stirring and dispersing, adding a stabilizer to the dispersion and further stirring the reaction to obtain a graphene oxide/metal sol. The graphene oxide/metal sol is uniformly coated on the surface of the organic substrate to obtain a graphene oxide/metal gel modified substrate. The organic ligand, the metal salt B and the organic solvent B are mixed and stirred uniformly to obtain a precursor liquid. The graphene oxide/metal gel modified substrate is immersed in the precursor liquid obtained and the dense metal organic framework functional layer is grown by hydrothermal reaction at 80 degrees C for 12 hours, which is cooled at room temperature and dried at room temperature to obtain a graphene oxide/metal organic framework composite film. USE - Method for preparing graphene oxide/metal organic framework composite membrane for use in the separation of hydrogen/carbon dioxide, hydrogen/nitrogen or hydrogen/methane gases (claimed). ADVANTAGE - The method enables achieving uniform and compact graphene oxide/metal organic framework composite membrane. DETAILED DESCRIPTION - A graphene oxide/metal organic framework composite membrane preparing method involves ultrasonically dispersing the graphene oxide in the organic solvent A to obtain a 0.1-2 mg/mL graphene oxide dispersion, adding the metal salt A to the graphene oxide dispersion, and stirring and dispersing at 40-60 degrees C, adding a stabilizer to the dispersion and further stirring the reaction for 0.1-1 hour to obtain a graphene oxide/metal sol. The graphene oxide/metal sol is uniformly coated on the surface of the organic substrate and treated at 80-120 degrees C for 1 hour to obtain a graphene oxide/metal gel modified substrate, where the graphene oxide and the metal salt are present in the mass ratio of 1:5-20 and metal salt and the stabilizer are present in the ratio of 1:1-4. The organic ligand, the metal salt B and the organic solvent B are mixed and stirred uniformly to obtain a precursor liquid, where the organic ligand is 2-methylimidazole or trimesic acid, if the organic ligand is 2-methylimidazole that the ratio of the amount of 2-methylimidazole and the metal salt B is 4:1 and if the organic ligand is trimesic acid that the ratio of the amount of trimesic acid and the metal salt B is 2:1. The graphene oxide/metal gel modified substrate is immersed in the precursor liquid obtained and the dense metal organic framework functional layer is grown by hydrothermal reaction at 80 degrees C for 12 hours, which is cooled at room temperature and dried at room temperature to obtain a graphene oxide/metal organic framework composite film.