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Kinetic Modeling and Thermodynamic Study of the Simultaneous Adsorption of Polycyclic Aromatic Hydrocarbons (PAHs) Onto Organomontmorillonite in Aqueous Medium
Abstract
Water is a vital source of human life, but it has frequently been polluted by mono and polycyclic aromatic hydrocarbons, usually from petrochemicals in petroleum industrial effluents as well as other anthropogenic activities. This study investigate the potential of montmorillonite intercalated HDTMA
and TMPA cations for effective removal of five (5) different polycyclic aromatic hydrocarbons (PAH) namely: naphthalene, anthracene, chrysene,benzo(a)pyrene and benzo(g,h,i) perylene in aqueous medium. To research PAH adsorption behaviour onto the organomontmorillonite, adsorption factors such as influence of contact hours, initial PAHs concentration, and temperature were used. Ab initio, Organomontmorillonite has been characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). Utilizing three kinetic models, the mechanism of the adsorption process was evaluatedfv. Result from the adsorption studies
confirmed 180 minutes equilibrium contact time for maximum PAH uptake by
organomontmorillonites. Highest R2 values obtained for pseudo second order kinetic model among other kinetic models, as well as correlated analyzed Error function (ERRSQ) confirmed pseudo second order kinetic model as best fit to kinetic data. Thermodynamic investigation of the adoption process revealed that the process of PAH adsorption onto the organomontmorillonite were feasible
and endothermic, with the negative values of entropy change for naphthalene, anthracene and chrysene; and also positive values of entropy change for Benzo (a) pyrene and Benzo (g,h,i) perylene adsorption onto the organoclays implying decrease and increase degree of randomness during the process of adsorption respectively.
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