▎ 摘　　要

NOVELTY - Preparing a highly stable ceramic-based sub- nanoporous graphene composite membrane, comprises using ceramic as a carrier, and introducing a low-roughness fine-porous inorganic transition layer on the surface of the carrier, and then introducing complete sub- nanoporous graphite separation layer; the thickness of the sub- nanopore graphene separation layer is between 10-500 nm, and the pure water flux during evaporation at 20-70degrees Celsius is 10-300 L.m-2.h-1, the composite film involves preparing the inorganic transition layer of the ceramic carrier by dipping-pulling and high-temperature sintering; preparing the inorganic transition layer sol with a concentration of 0.01-0.5 wt.%, and the ceramic carrier is in the inorganic transition layer, dipping and pulling in the layer sol, the dipping time is 5-10 s, and the pulling speed is controlled at 0.5-1.5 cm/s. USE - Method for preparing a highly stable ceramic-based sub- nanoporous graphene composite membrane where the composite film is used for desalting sea water in the process of permeating and evaporating. ADVANTAGE - The method has high-efficiency precise separation application through pervaporation process such as seawater desalination, high salt waste water desalination, seawater and geothermal waste-water deboron and other waste water (such as antibiotic waste water and low-concentration volatile organic pollutant waste water) with good separation performance and extreme environmental stability. DETAILED DESCRIPTION - Preparing a highly stable ceramic-based sub- nanoporous graphene composite membrane, comprises using ceramic as a carrier, and introducing a low-roughness fine-porous inorganic transition layer on the surface of the carrier, and then introducing complete sub- nanoporous graphite separation layer; the thickness of the sub- nanopore graphene separation layer is between 10-500 nm, and the pure water flux during evaporation at 20-70degrees Celsius is 10-300 L.m-2.h-1, the composite film involves preparing the inorganic transition layer of the ceramic carrier by dipping-pulling and high-temperature sintering; preparing the inorganic transition layer sol with a concentration of 0.01-0.5 wt.%, and the ceramic carrier is in the inorganic transition layer, dipping and pulling in the layer sol, the dipping time is 5-10 s, and the pulling speed is controlled at 0.5-1.5 cm/s; drying the successfully impregnated carrier and sintering at high temperature to obtain an inorganic transition layer with a thickness of 1-10; preparing graphene oxide suspension by adding graphite oxide powder into deionized water, exfoliating the graphite powder with an ultrasonic instrument for 2-3 hours to obtain a graphene oxide nanosheet dispersion, and centrifuging to remove the lower sediment to obtain a completely dispersed graphene oxide suspension; the ratio of the graphite oxide powder to deionized water is 5-50mg: 100mL; preparing graphene cross-agent suspension by configuring a crosslinking agent solution with a mass fraction of 0.1-1 wt.%; mixing and stirring the graphene oxide suspension and the crosslinking agent solution for more than 16 hours to obtain oxidized graphene cross-agent suspension; the volume ratio of the graphene oxide suspension to the crosslinking agent solution is (1-10): (10-1); preparing sub- nanoporous graphene composite membrane: use vacuum filtration method and gas atmosphere reduction method to prepare; connect the ceramic carrier with inorganic transition layer to the suction filtration device, and put it into the graphene cross-agent suspension, suction filtration for 10-60min to form a stacked continuous membrane layer on the surface of the carrier, putting in a 40-100degrees Celsius oven for drying for 6-12 hours; putting the dried composite membrane into a tube furnace and pass the flow rate of 10-100 mL /min gas, heated to 300-1000degrees Celsius at a rate of 1-5degrees Celsius/min, and carbonized and reduced at high temperature for 0.5-10 hours to obtain a highly stable ceramic-based sub- nanoporous graphene composite membrane. An INDEPENDENT CLAIM is included for use of the ceramic-based sub- nanometre hole-graphene composite film obtained by the preparation where ceramic carrier is sheet-shaped or tubular zirconium oxide, aluminum oxide, titanium oxide, silicon oxide, spinel, mullite or copper oxide, the inorganic transition layer is aluminum oxide (Al2O3), silicon oxide, zinc oxide, zirconium oxide, or titanium oxide, the cross-linking agent chitosan, polyacrylic acid, polyvinyl alcohol, thiourea,m-phenylenediamine, ethylenediamine, acrylic ester, dopamine hydrochloride or polyethylene imine, the gas atmosphere is hydrogen, nitrogen, methane, argon gas, ethylene or oxygen.