▎ 摘　　要

NOVELTY - Composite material comprises a polyurethane foam coated with a layer of reduced graphene oxide (r-GO), and a layer of polystyrene in contact with the layer of r-GO, where the composite material has a pore diameter of 50-500 mu m. USE - The composite material is useful for separating a nonpolar compound from an aqueous solution in a mixture (claimed). ADVANTAGE - The composite material: is obtained as a porous 3-dimensional network of polystyrene and graphene that exhibits excellent mechanical stability and superhydrophobic behavior; can be obtained by a polymerization process under natural sunlight, hence green, non-hazardous, and cost-effective route; can be obtained with a uniform and controlled morphology, thus providing a greater surface area for the efficient separation of oil from water; and maintains an adsorption capacity that allows it to adsorb 20-50 times its weight of the nonpolar compound, hence reusable. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) making (M1) the composite material, comprising contacting a polyurethane foam with a suspension of r-GO in an alcohol to produce a wet scaffold, drying the wet scaffold to produce a r-GO grafted polyurethane composite, and irradiating the r-GO grafted polyurethane composite in the presence of a styrene vapor to produce the composite material; and (2) separating (M2) a nonpolar compound from an aqueous solution in a mixture, comprising contacting the mixture with the composite material, where the composite material adsorbs 8-25 times its weight of the nonpolar compound.