Isotherm adsorption of free fatty acid in waste cooking oil used activated carbon of banana peel as bio-adsorbent

Abstract

The reduction of free fatty acids from the remaining cooking oil was successfully adsorbed by activated carbon from the banana peel biomass. The difference in activation temperature in making activated carbon causes it to adsorb free fatty acids, different from frying frozen fries in palm oil. The method used is adsorption with a batch system. The adsorbent used was biocarbon from banana peels, activated at 600, 650, and 700°C for 1 hour. Powdered activated carbon products were used in the adsorption process with a pass size of 200 mesh. Isotherm modeling with 1% activated carbon content in used cooking oil was carried out to determine the equilibrium constant in the Temkin, Langmuir, Freundlich, and Dubinin Radushkevich models. The suitability for adsorption of free fatty acids, which tends to approximate the Freundlich model. Adsorption of free fatty acids with activated carbon at 700°C effectively follows the Freundlich Isotherm Adsorption Model (R2 = 0.97) with physical adsorption energy, and the maximum capacity is 27.404 mg/g as seen from other isotherm models.