▎ 摘　　要

NOVELTY - A graphene oxide-rhamnolipid composite material has black grey layer having porous structure, interlayer distance of 0.87-1.03 nm and aperture of 2-10 nm. USE - Graphene oxide-rhamnolipid composite material is used for absorbing cationic dye (claimed). ADVANTAGE - The graphene oxide-rhamnolipid composite material is non-toxic, environmentally-friendly, and obtained by a simple process. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of graphene oxide-rhamnolipid composite material, which involves adding graphene oxide to dispersant, ultrasonic-mixing for 1-2 hours, obtaining graphene oxide mixed solution, adding rhamnolipid, and catalyst including 1-(3-amino propyl)carbodiimide hydrochloride and 4-methyl amino pyridine, ultrasonic-mixing at 25-45 degrees C for 2-4 hours, adding anhydrous methanol, stirring, obtaining precipitate, washing using ethanol, centrifuging, filtering, washing using deionized water, and vacuum drying at -110 degrees C for 2-3 days; and (2) absorption of cationic dye, which involves providing 0.2-1 g/l graphene oxide-rhamnolipid composite material to 50-400 mg/l cationic dye solution having pH of 7-7.3 at 25 degrees C, mixing at 170 rpm for 5 minutes to 24 hours, and providing to aqueous membrane with pores having size of 0.22 microns.