▎ 摘　　要

NOVELTY - Graphene oxide separation membrane comprises selective separation layer and support layer. The selective separation layer includes graphene oxide nano-sheet, and also includes nano-cluster formed by silver ion and polyelectrolyte between nano-sheet. USE - Graphene oxide separation membrane used for separating ethylene-ethane mixed gas (claimed). ADVANTAGE - The graphene oxide separation membrane has promoted preferential penetration of ethylene molecules and realized efficient separation of ethylene/ethane mixed gases, exhibited excellent performance stability during the test of ethylene/ethane mixture for more than 100 hours, and has a good application prospect in the preparation of high-purity ethylene. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing graphene oxide separation membrane, which involves: (a) preparing dispersion liquid of monolayer graphene oxide nanosheet; (b) mixing the silver salt with the polyelectrolyte solution;(c)performing an ion exchange reaction; (d) adding to the obtained dispersion as a coating solution; and (e) applying the obtained coating solution on the support layer to obtain a separation membrane.