Modelling Of The Kinetic And Equilibrium Sorption Behaviour Of Crude Oil On HDTMAB Modified Nigerian Nanoclays
Nwankwere Emeka Thompson, Gimba Casimir Emmanuel, Ndukwe Iloegbulam George, Isuwa Kari Adamu
Index Terms: Equilibria, HDTMA, kinetics, oil Spill, organoclays, sorption.
Abstract: This study explores the feasibility of using local nanoclays as starting materials for sorbents with potential to treat crude oil polluted aquatic environment. The nanoclays have been converted into environmentally friendly and hydrophobic sorbents by a hydrothermal method under mild conditions using Hexadecyltrimetylammonium bromide (HDTMAB) as intercalant. Batch sorption studies were studied for oil concentration (0.5-5.0 g/100ml) and contact time (1-30 mins). An attempt to describe the crude oil sorptive behaviour of the organoclays b applying popular adsorption models were discussed and the experimental methods adopted for the determination and estimation of the sorption coefficients have also been described. The Langmuir, the Freundlich and the Dubinin-Radushkevich adsorption models were applied to experimental equilibrium data. Also the kinetic properties of the sorption procedure were evaluated using the pseudo-second-order, Elovich and the intraparticle diffusion of Weber and Morris kinetics models. It was discovered that the sorption process best fitted the Langmuir and the Pseudo-second-order rate models. It was concluded that the organoclays have a good affinity for the crude oil, the sorption process was mostly by monolayer coverage, the manner of sorption by chemisorption and that diffusion was not only the rate-controlling step.
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