Abstract
This paper deals with the removal of indigo carmine from aqueous solution using granular activated carbon in the batch method experiments. Correlated data were evaluated using Langmuir, Freundlich and Liu isotherm models . We found that the adsorption process can be favorably agreed by the Liu isotherm. Furthermore, the kinetic data were modeled using the pseudo-first order, pseudo-second order, Elovich equation, and Avrami fractionary kinetic equation. The results obtained show that the adsorption of indigo carmine on granular activated carbon follows the Avrami fractionary kinetic adsorption model. Thermodynamic studies were also evaluated to indicate that the adsorption process is spontaneous and endothermic.
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