The invention discloses an oxidized
graphene-
rhamnolipid composite material which is black gray
powder and is of a laminar multi-hole nano structure. The invention further discloses a preparation method of the
composite material. The preparation method includes the following steps that oxidized
graphene is added into a dispersing agent, and oxidized
graphene mixed liquor is formed after
ultrasonic dispersion;
rhamnolipid, 1-ethyl-(3-dimethyl amino propyl)
carbodiimide hydrochloride and 4-dimethylamino
pyridine are added into the mixed liquor, then the ultrasonic reaction is performed, and a certain amount of absolute
methanol is added and mixed for generating sediments; the sediments are washed and centrifuged, and finally the oxidized graphene-
rhamnolipid composite material is prepared through vacuum
freeze drying. The invention further relates to application, in aspect of cationic
dye absorption, of the composite material prepared through the method. The prepared composite material is low in biological
toxicity and not prone to agglomeration, the preparation method is simple and easy to carry out, and in the process of the cationic
dye absorption, the prepared composite material has the advantages of being free of secondary
pollution and enabling solids and liquids to be separated easily.