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Abstract
This study reports tannic acid adsorption onto commercial activated carbon (ACC) in a batch system. Adsorption process parameters namely pH, adsorbent dose (mad), temperature (T), initial tannic acid concentration (Co), and contact time (t) were studied and optimized. Optimum pH and adsorbent dose were found to be 3.0 and 15 g/l, respectively. Equilibrium contact time was found to be 7 h. Pseudo-second-order kinetic best fits the adsorption kinetic data. Three isotherms namely Langmuir, Temkin, and Redlich and Peterson (R–P) isotherms were studied and it was found that Langmuir and R–P isotherm generally fitted the experimental equilibrium adsorption data. Endothermic nature of the adsorption of tannic acid onto ACC was concluded, and heat of adsorption was found to be as 89.55 kJ/mol. On considering the cost of ACC, regeneration studies of Tannic acid (TA) loaded ACC have been performed using solvent and thermal desorption methods.