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[Display omitted] • Reusable composite oil sorbents produced by synthesizing Reduced Graphene Oxide (rGO) and its infusion in polystyrene. • Polystyrene composite, (PS)/rGO, produced via solution blending and electrospinning method. • Surface area of PS was enhanced from 71.52 m2/g to 285.07 m2/g by incorporating rGO. • Oil adsorption capacity of PS-rGO was evaluated using engine oil, motor oil and vegetable oil. • PS-rGO showed adsorption capacity of 164.70 g/g, 129.68 g/g and 109.87 g/g, respectively. This study enhanced the adsorptive capacity of polystyrene (PS) by infusing reduced graphene oxide (rGO) nanoparticles obtained from the synthesis of graphene oxide to produce PS-rGO composites via electrospinning method. Physicochemical characterization of as-synthesized rGO and PS-rGO were carried out through scanning electron microscopy, N 2 physisorption among others. Oil sorption performance of synthesized rGO in crude oil, vegetable oil, fresh engine oil and used engine oil are 130.96 g/g, 121.77 g/g, 105.01 g/g and 100.56 g/g. Oil sorption capacities of electrospun pure PS in crude oil, vegetable oil, fresh engine oil and used engine oil were 46.32 g/g, 38.54 g/g, 35.14 g/g and 32.57 g/g and those of PS-rGO infused with 4 wt% of rGO were found to be 105.52 g/g, 98.86 g/g, 86.25 g/g and 83.47 g/g for crude oil, vegetable oil, fresh engine oil and used engine oil samples respectively. Pseudo second order (PSO) kinetic model fits the sorption data of the four oil samples on the four composite sorbents produced. Intra-particle diffusion (IPD) model evidently showed that sorption of the four oil samples on the four composite sorbents, occurred in three (3) phases. Composites demonstrate high oil adsorption capacity, and are reusable upto three sorption–desorption cycles. [ABSTRACT FROM AUTHOR]