Removal of methyl green dye from aqueous solutions using activated carbon derived from cryogenic crushed waste tires

Activated carbon obtained from cryogenic crushing of used tire prepared and characterized previously was used as an adsorbent for the removal of cationic dye “methyl green dye MG” from an aqueous solution. Batch adsorption studies were carried as a function of varying parameters of the system such as initial solution pH, adsorbent dosage, initial dye concentration, and temperature. The experimental data were fitted using Langmuir, Freundlich, Dubinin-Radushkevich, and Temkin isotherm models. The Langmuir isotherm model fitted well the obtained experimental data. The maximum adsorption capacity of methyl green dye at pH 7 was found to be 71.43 mg/g. The results of kinetics study indicated that the experimental data are fitted to Pseudo-first order model. The thermodynamic properties like ∆G, ∆H, and ∆S were estimated for the adsorption processes and indicated that this latter was exothermic, spontaneous, and favorable. The developed activated carbon might be used in a favorably manner for removing methyl green from aqueous solution.