Thermodynamic and Kinetic Study of 6-methoxy benzthiazole azo- ß-naphthole Dye Adsorption by Activated Carbon

Abstract

A commercial activated carbon was used for the adsorption of azo dye from aqueous solution employing batch method. This dye was synthesized in our laboratory from the reaction of 6-methoxy-2-amino-benzothiazole and ß-naphthole via diazonium ions. The effect of pH, temperature, and contact time on dye removal was investigated. The apparent thermodynamic parameters were estimated and the obtained results concluded that, the dye adsorbed onto activated carbon is exothermic and spontaneous processes. The kinetic of adsorption was conducted by using the pseudo-first and pseudo-second order kinetic models. The results of the kinetic analysis showed that, the second order equation was more appropriate and better fit the experimental data.