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Removal of Pigments from Palm Oil Using Activated Ibusa Kaolinite: Equilibrium, Kinetic and Thermodynamic Studies

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Document pages: 14 pages

Abstract: The effectiveness of Ibusa kaolinite as anadsorbent in removing pigments from palm oil has been investigated in thisstudy. Ibusa kaolinite was prepared as an adsorbent by treating it withhydrochloric acid. The surface area of the clay was found to increase withincrease in acid dosage up to a maximum and then de-creased while its cationexchange capacity decreased with increase in acid dosage. The activated claywas used as an adsorbent for the removal of pigments from palm oil. Thebleaching process was investigated by varying the clay dosage, acidconcentration and temperature. The highest removal of pigments was recorded at7 M HCl concentration, 4 g clay dosage and 100°C temperature, and about97.4 pigments were removed in 80 minutes. Four isotherm models, three kineticmodels, and the intra-particle diffusion model were applied to fit theexperimental data. It was found that the equilibrium data were best representedby the Temkin isotherm model. The experimental data fitted well thepseudo-second-order kinetic model. Diffusion studies indicated thatin-tra-particle diffusion is not the sole rate-controlling factor. Thebleaching pro-cess was found to be spontaneous and endothermic, with increasingrandom-ness of adsorbed species.

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