LAUSR

In the present study, low-cost oil adsorptive materials based on chitosan (CS) and its functionalized derivatives (aminated chitosan (AmCS) and nonanyl chitosan schiffbase (NCS) were undertaken. The chemical structure of the CS sorbents, as well as its surface morphologies, was confirmed by Fourier infrared (FT-IR)spectroscopy and scanning electron microscope (SEM). Parameters affecting the sorption capacity such as reaction time, crude oil concentration, adsorbent dose, and temperatures were studied. Equilibrium studies of the oil sorption data have been analysed using the linear forms of Langmuir, Freundlich, Temkin, and Dubin-Radushkevich (D–R) isotherm models. The sorption kinetics was investigated by the pseudo-first and the pseudo-second-order, the Elovich, the intra particle diffusion kinetic, and the Boyd models. The equilibrium data were found to fit adequately with the Langmuir with maximum mono layer sorption capacities 32.154, 45.045, and 59.172 g/g for CS, AmCS, and NCS respectively. The kinetics of the oil sorption process onto chitosan derivatives could be described as pseudo-second-order and a film diffusion controlled mechanism. Besides, thermodynamic parameters computed from Van’t Hoff plot confirmed the process to be endothermic, favourable and spontaneous.