The adsorption of Remazol Brilliant Violet‐5R (RBV‐5R) reactive dye on cocoa pod husk activated carbon (CPHAC) was investigated in batch process. The effects of initial dye concentration, contact time, solution temperature and pH were evaluated. The equilibrium data were fitted into Langmuir, Freundlich, Temkin and Dubinin‐Radushkevich isotherm models. It was found that Freundlich model fitted the adsorption data most. The kinetic data were fitted into pseudo‐first‐order, pseudo‐second‐order, Elovich and intraparticle diffusion models. Adsorption of RBV‐5R dye on CPHAC was best described by pseudo‐second‐order kinetic model. The adsorption of RBV‐5R dye was favored at acidic pH. Thermodynamic parameters such as standard free energy ΔG0, standard enthalpy ΔH0 and standard entropy ΔS0 were calculated. The adsorption interaction of RBV‐5R reactive dye on the adsorbent was found to be feasible, spontaneous and endothermic. The adsorption process followed a physisorption mechanism.
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Bello et al. (2011) studied this question.