▎ 摘　　要

NOVELTY - Preparing graphene oxide nano-sheet loaded polyamide film comprises (a) preparing graphene solution from obtained graphite sheet using Hummers method, (b) oxidizing the graphene solution, (c) reacting hollow fiber ultra-filtration membrane, m-phenylenediamine as aqueous phase monomer and trimesoylchloride as organic phase monomer in polysulfone via interfacial polymerization method, and (d) contacting obtained treated polyamide/polysulfone hollow fiber composite membrane and graphene oxide mixed solution, adding dichloroethane and hydroxy succinimide mixed solution, stirring and washing. USE - The polyamide film is useful in water treatment and desalination treatment (claimed). ADVANTAGE - The polyamide film reduces production cost and graphene oxide usage. DETAILED DESCRIPTION - Preparing graphene oxide nano-sheet loaded polyamide film comprises: (a) processing obtained graphite sheet using Hummers method, and followed by ultrasonic processing to obtain graphene solution; (b) oxidizing the graphene solution to obtain graphene oxide; (c) reacting hollow fiber ultra-filtration membrane as base film, m-phenylenediamine as aqueous phase monomer and trimesoylchloride as organic phase monomer in polysulfone via interfacial polymerization method to obtain polyamide/polysulfone hollow fiber composite membrane, where the polyamide/polysulfone hollow fiber composite membrane is prepared by 12 wt.% polysulfone glass powder is added to 1-methyl-2-pyrrolidone with purity of greater than 99.5 %, stirring until to dissolve completely, placing the mixture in a desiccator and drying overnight to obtain mixed liquid, bonding non-woven polyester on a clean glass plate, and wetting using 1-methyl-2-pyrrolidone, pouring 5-15ml of above mixed liquid on one end of non-woven polyester, spreading the mixed liquid on the nonwoven fabric uniformly using applicator to obtain a treated glass plate, placing the treated glass plate in distilled hydrogel bath for 10-15 minutes, and followed by phase separation to obtain thin film support, immersing the thin film support in 3.4 wt.% aqueous m-phenylenediamine solution for 1-5 minutes, removing excess solution for 1 minute, and then immersing in 0.15 wt.% trimesoylchloride organic phase solution (the interfacial reaction between m-phenylenediamine and trimesoylchloride on the thin film support) to obtain compact polymer cortex, followed by soaking in distilled water for 2 minutes at 95 degrees C, soaking in 200 ppm sodium hypochlorite solution for 2 minutes and 1000 ppm sodium bisulfite solution for 30 seconds, and then cleaning and storing at 4 degrees C in distilled water; and (d) wrapping the composite membrane obtained in step (c), exposing the thin film top of polymer cortex, then contacting with mixed buffer solution (pH of 5) composed of 4 mmol/l dichloroethane, 10 mmol/l hydroxysuccinimide 0.5 mol/l sodium chloride and 10 mmol/l fatty acid methyl ester sulfonate for 1-1.5 hours, followed by washing twice with distilled water to remove composite membrane surface residue of mixed buffer solution, and then contacting the hollow fiber composite membrane with buffer solution (pH of 7.5) composed of 10 mmol/l ethylenediamine, 0.15 mmol/l sodium chloride and 10mmol/l 2-(4-(2-hydroxyethyl)piperazin-1-yl)ethanesulfonic acid for 25-35 minutes to obtain treated polyamide/polysulfone hollow fiber composite membrane, (where ethylenediamine attachment with the surface of the composite film) (d1), and adding 10-15 mg the graphene oxide in 10ml of (10 mmol/l) fatty acid methyl ester sulfonate buffer solution at pH of 6 and ultra-sonication for 10-15 minutes to obtain a stable suspension, centrifuging the suspension at room temperature, transferring the supernatant at pH of 6 into 40ml of 10 mmol/l fatty acid methyl ester sulfonate buffer solution and reacting for 15 minutes to obtain graphene oxide mixed solution (d2), then contacting the graphene oxide mixed solution with treated polyamide/polysulfone hollow fiber composite membrane, adding 2 mmol/l dichloroethane and 5 mmol/l hydroxy succinimide mixed solution, placing on an orbital shaker and stirring for 10-20 minutes at rotational speed of 70 rotations per minute to obtain graphene oxide attached to the surface of the polyamide film as a reactant, washing the reactant with distilled water, ultrasonicating for 2 minutes to remove composite film could not adhered to the surface of graphene oxide to obtain graphene oxide nano-sheet loaded polyamide film, which is stored in distilled water at 4 degrees C. An INDEPENDENT CLAIM is also included for graphene oxide nano-sheet loaded polyamide film, prepared by above method.