Purification of waste water by removal of methylene blue using acid activated Morupule coal was investigated through a study of thermodynamics and kinetics of the dye adsorption from aqueous solution at various concentrations, pH and temperature. The rate of adsorption and quantity adsorbed were found to increase with increasing initial methylene blue concentration, decreasing pH and increasing temperature. Adsorption followed a two stage profile indicating an increase in available surface for the process probably initiated by initial adsorption causing swelling of the coal. Kinetics data follows the Legergren pseudo second order model best indicating the existence of two simultaneous adsorption processes thought to be adsorption on the outer and inner surfaces as well as on the surface freshly exposed by swelling. The thermodynamics data fitted the Freundlich model best indicating heterogeneity of the coal surface.

Keywords: Dyes removal, Waste water purification, Dyes’ adsorption, Kinetics and thermodynamics

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