▎ 摘　　要

NOVELTY - A separation membrane has a graphene oxide layer. The graphene oxide layer has flux of sodium oxide obtained by forward osmosis membrane evaluation measured using 7 %mass sodium chloride aqueous solution as a draw liquid and pure water as a feed liquid and heating graphene oxide layer, of 140 g/m2.hour. USE - Separation membrane used for separating gas for removing microparticles, organic molecules and ions in seawater desalination and osmotic pressure electric power generation. ADVANTAGE - The separation membrane ensures gas separation at high speed. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) manufacture of separation membrane, which involves arranging porous support component comprising a polymer, dispersion liquid comprising graphene oxide to form a graphene oxide layer and heating graphene oxide layer at 150 degrees C or more; and (2) forward osmosis unit, which has forward osmosis extraction portion to circulate feed liquid and extracting side region to circulate a draw liquid adjoining the separation membrane, and separation and recovery portion which remove solute using draw liquid after extraction and separating and recovering a solvent.