Abstract:
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, N2 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.
