Abstract
An investigation was performed for the regeneration of durian shell and jackfruit peel activated carbons loaded with methylene blue dye (MB). The exhausted carbons were treated in a modified conventional microwave oven operated at 2.45GHz and irradiation time of 3 and 4min. The efficacy of the regeneration study was analyzed by determining the carbon yield and amount of MB adsorbed in successive adsorption–regeneration cycles. The virgin properties of the original and regenerated activated carbons were characterized by pore structural analysis, nitrogen adsorption isotherm, surface acidity/basicity and zeta potential measurement. Equilibrium data were simulated using the Langmuir, Freundlich, Temkin and Dubinin–Radushkevich isotherm models.The adsorption uptake and carbon yield of the regenerated activated carbons could maintain at 181.43–207.57mg/g and 80.51–81.63%, even after five adsorption–regeneration cycles. Microwave heating preserved the porous structure of the exhausted activated carbons efficiently to restore the original active sites and adsorption capacity.
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