Kinetics and Equilibrium of Crude Oil Sorption from Aqueous Solution Using Borassus Aeothopum Coir

Abstract

In this study, Borassus aethopum coir (BAC) which is an abundant, cheap, readily available and biodegradable agricultural waste was modified by acetylation using acetic anhydride and NBS catalyst at room temperature. This was to increase their hydrophobic properties and improve their sorption capacity in aqueous environment. The crude oil sorption kinetic data were fitted by intra-particle diffusion and pseudo-first order for raw BAC but the pseudo-second order kinetic model best fits crude oil sorption data for acetylated BAC.  The Langmuir and Freundlich models were used to elucidate the sorption behaviour of crude oil with raw and acetylated BAC. Freundlich isotherm gave the best fit for the equilibrium crude oil sorption data for acetylated BAC and raw BAC. Fourier transform infrared and scanning electron microscope analyses showed clear evidence of successful acetylation. The results presented and discussed in the study suggests that acetylated BAC (ABAC) is more suitable for crude oil sorption than raw BAC, therefore, possesses more potential for application and further development in treatment of oil spillage.

Keywords: acetylated borassus aethopum coir, kinetics, crude oil sorption, sorbents, sorption capacity.

DOI: 10.7176/CMR/11-2-02