Investigation of Kinetics of Adsorption of Acidic Blue 206 Dye on Multi-Wall Carbon Nano Tube Using Linear and Nonlinear Regression and Activation Energy Determination

Document Type : Research Article


Department of Chemistry, Faculty of Basic Sciences, Varmin-Pishva Branch, Islamic Azad University, Varamin, I.R. IRAN


In this research, the kinetics of removal of acidic blue 206, an acidic dye, from aqueous solution by multi-wall carbon nanotube at optimized pH of 6.5 and 298K has been investigated. Six kinetics models contain pseudo-first-order, pseudo-second-order, intra-particle, Elovich, Bingham, and modified Freundlich model used. Kinetic data were fitted by these six models using linear and nonlinear regression. The results showed that the pseudo-second-order model was best fitted in both linear and nonlinear regression methods. The rate-determining step was the surface adsorption. The calculated qe at pseudo-first-order and pseudo-second-order models, (73mg/g and 75mg/g, respectively) are near the experimental value (99 mg/g). The order of compatibility of data with other models at nonlinear regression is pseudo-first order> Bingham> modified Freundlich> Elovich> intra-particle diffusion models. For leaner regression the order of compatibility of data are Bingham> elovich> modified freundlich> intra-particle diffusion> pseudo-first-order models. The calculated Arrhenius activation energy was -61.63kJ/mol. The negative activation energy, Ea, means that there is no barrier energy on surface adsorption and the adsorption is exothermic.


Main Subjects

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