Evaluation of Kinetic Models of Beta-Carotene Adsorption from Palm Oil onto Bentonite

In this work, the adsorption of beta-carotene from palm oil onto bentonite was performed under 35 bleaching conditions that were made using a combination of 4 variables. They were varying concentrations of beta-carotene in palm oil (300, 400, 500 mg/kg), varying dosage percentages of bentonite (0.5, 1.25, 2 %), varying surface areas of bentonite (190, 225, 275 m2/g), and varying temperatures (50, 80, 110 oC). The experimental data was analyzed by using several kinetic models (intra-particle diffusion, Elovich equation, pseudo-first order, and pseudo-second order). Kinetic parameters, coefficient of determination, and adsorption curve of models were evaluated to determine the best kinetic model to describe the adsorption of beta-carotene from palm oil onto bentonite. The experimental data was described accurately by the intra-particle adsorption model only at the adsorption process with low adsorption rate. The Elovich equation model showed a tendency to give negative values of sorption capacity at the beginning period of the adsorption process with low initial adsorption rate. At the adsorption process with low and medium adsorption rate constants, the adsorption curve of the pseudo-first order model showed a tendency to move away from the experimental data, but the pseudo-second order model still followed the experimental data. The pseudo-second order model was the most appropriate kinetic model to describe the adsorption of beta-carotene from palm oil onto bentonite.

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