▎ 摘　　要

NOVELTY - Preparing manganese oxide (MnO2) incited graphene quantum dots membrane involves: a) dissolving certain measures of graphene quantum dots (GQDs)/MnO2 in N-methyl-2-pyrrolidone (NMP) with basic stirring followed by sonication for an hour for preparing thin film composite (TFC)-MnO2, 7 TFC-GQD/MnO2-1, TFC-GQD/MnO2-2 and TFC-GQD/MnO2-3 substrates; b) adding certain amount of cellulose acetate (CA) and polyvinylpyrrolidone (PVP) to the prepared solution, where the casting solution is mixed continuously on a magnetic stirrer for 21 hours to acquire homogeneous viscous liquid; c) leaving the acquired suspension at room temperature to eliminate the presence of air bubbles for 2 hours; d) forming TFC FO (Thin film composite forward osmosis) membranes by spreading the obtained suspension on a fine glass plate utilizing 100 µm fabricating blade and immersing in deionized water (DI) tank at room temperature for phase inversion (PI). USE - Method for preparing manganese oxide (MnO2) incited graphene quantum dots membrane. ADVANTAGE - The method enables to prepare manganese oxide (MnO2) incited graphene quantum dots membrane in which the solid H-bonding among nanocomposite and cellulose is upheld by expanded consistency of the casting solution. The roughness of the TFC (Thin film composite) surface improves with the GQDs-MnO2expansion because of the high hydrophilicity in the GQDs-MnO2membrane that builds the solvent/non-solvent rate of exchange that brings about higher surface roughness of the created FO membranes. The durability and structural integrity of the TFC FO membrane is examined by soaking in 0.2 M sodium chloride salt solution utilizing free-standing membrane. The TFC FO GQD/MnO2membranes exhibited improved water permeability, enhanced surface morphology and superior water flux and salt rejection (96.87 %). DETAILED DESCRIPTION - Preparing manganese oxide (MnO2) incited graphene quantum dots membrane involves: a) dissolving certain measures of graphene quantum dots (GQDs)/MnO2 in N-methyl-2-pyrrolidone (NMP) with basic stirring followed by sonication for an hour for preparing thin film composite (TFC)-MnO2, 7 TFC-GQD/MnO2-1, TFC-GQD/MnO2-2 and TFC-GQD/MnO2-3 substrates; b) adding certain amount of cellulose acetate (CA) and polyvinylpyrrolidone (PVP) to the prepared solution, where the casting solution is mixed continuously on a magnetic stirrer for 21 hours to acquire homogeneous viscous liquid; c) leaving the acquired suspension at room temperature to eliminate the presence of air bubbles for 2 hours; d) forming TFC FO (Thin film composite forward osmosis) membranes by spreading the obtained suspension on a fine glass plate utilizing 100 µm fabricating blade and immersing in deionized water (DI) tank at room temperature for phase inversion (PI); e) eliminating the remaining solvent, and storing the membrane in a new DI water tank for the filtration experiments.