▎ 摘　　要

NOVELTY - Preparation of gas separation membrane, involves adding mixture of potassium permanganate, carbon nanotubes, concentrated sulfuric acid and phosphoric acid to ice containing hydrogen peroxide, maintaining and removing supernatant, washing, dissolving in hydrochloric acid, filtering, washing to obtain carbon nanotubes/graphene oxide, ultrasonically dispersing in ethanol and water solution to obtain uniform dispersion (A), dissolving polyether block amide in ethanol and water solution, stirring to obtain dispersion (B), mixing dispersion (A) and dispersion (B), degassing and drying. USE - Preparation of gas separation membrane based on carbon nanotubes/graphene/polyether block amide (claimed). ADVANTAGE - The gas separation membrane has excellent thermal stability, high gas permeability coefficient and separation coefficient. DETAILED DESCRIPTION - Preparation of gas separation membrane based on carbon nanotubes/graphene/polyether block amide, involves (i) dispersing 300 mg carbon nanotubes in 80 ml concentrated sulfuric acid having concentration of 16 mol/L, stirring evenly, adding 8 ml phosphoric acid, then stirring for 20 minutes, (ii) adding 1 g potassium permanganate to the mixed solution obtained in the step (i), stirring for 1 hour, and stirring the mixture at 60 degrees C for 2 hours, (iii) adding the obtained dissolved mixture to 100 ml ice containing 5% hydrogen peroxide, maintaining for 24 hours, removing the supernatant, (iv) washing with hydrochloric acid having concentration of 30%, then dissolving the product in 60 ml of 30% hydrochloric acid, maintaining for 12 hours, filtering and washing to neutral to obtain carbon nanotubes/graphene oxide, (v) ultrasonically dispersing certain amount of the carbon nanotubes/graphene oxide in a mixed solution of ethanol and water which are mixed in a mass ratio 7:3 to obtain a uniform dispersion (A), dissolving a certain amount of polyether block amide in the same amount of ethanol and water solution, stirring until completely dissolved to obtain dispersion (B), mixing the dispersion (A) and dispersion (B), degassing, and pouring into a Petri dish and drying to form a gas separation membrane.