Adsorption of Free Fatty Acid from Waste Palm Oil on Pineapple Peel Ash
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Abstract
Free fatty acid removal in used palm oil by ash of pine apple peels as low cost adsorbent was investigated. The adsorption was optimized with respect to contact time (30-330 min), the amount of adsorbent (0.5-2.0 g) and the temperature (30-60°C). It was found that 2 g of ash in 50 g used palm oil at 250 rpm, 30°C provided the highest adsorption in 81.39%. Additionally, the data was better fitted to Langmuir isotherm (R2 =0.9954) than Freundlich isotherm. The adsorption kinetic was consistent with pseudo-second-order (R2 = 0.9980). Furthermore, the adsorption thermodynamics study was revealed that the change in enthalpy, entropy and Gibbs free energy were -48.614 kJ/mol, -0.124 kJ/ mol.K and -11.042 to -7.322 kJ/mol respectively.
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