Poly(acrylic acid) (PAA) and graphene oxide-chitosan (GO-CS) composites were deposited on the surface of polypropylene (PP) microporous membrane to prepare poly(acrylic acid)/graphene oxide-chitosan (PAA/GO-CS)

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composite membrane by layer-by-layer assembly technology. The adsorption and separation effect of (PAA/GO-CS)

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composite membrane for methylene blue and congo red in aqueous solution was investigated. The structures of GO-CS complex and (PAA/GO-CS)

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composite membrane were characterized by infrared spectroscopy

thermogravimetric analysis and scanning electron microscope. Results show that (PAA/GO-CS)

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composite membrane was successfully prepared and had stable thermochemical properties. The surface morphology and porosity of the composite membrane can be controlled by the number of assembled layers. The permeability of the composite membrane to methylene blue and congo red decreased with the increase of the number of assembled layers

and the interception rate increased with the increase of the number of assembled layers. The permeability of the composite membrane for methylene blue was 2761.3 L·m

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·h

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·bar

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the retention rate was 91%

the adsorption rate was 39%. The permeability for congo red was 3068 L·m

-2

·h

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·bar

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the retention rate was 43%

the adsorption rate was 33% when assembled to 20 layers. The composite film has preferential adsorption for positively charged cationic dyes.