EQUILIBRIUM AND THERMODYNAMIC PARAMETERS OF ADSORPTION OF METHYLENE BLUE ONTO RECTORITE

The effect of temperature on the equilibrium adsorp- tion of Methylene Blue dye from aqueous solution using rectorite was investigated. The equilibrium adsorption data were analyzed using three widely applied isotherms; Lang- muir, Freundlich, and Redlich-Peterson isotherm. A non- linear method was used for comparing the best fitting of the isotherms. Best fits were found to be Redlich-Peterson isotherm. Thermodynamic parameters, such as ∆G°, ∆H°, and ∆S°, were calculated using adsorption equilibrium constant obtained from the Langmuir isotherm. Results suggested that the Methylene Blue adsorption on rectorite was a spontaneous and endothermic process.