<![CDATA[This study aimed to develop an adsorbent derived from chicken eggshell waste for the purification of used cooking oil. Repeated consumption of used cooking oil poses potential health risks due to the accumulation of degradation products; therefore, purification is necessary before further utilization. Chicken eggshells were selected as the raw material because of their high calcium carbonate content and porous structure, which contribute to their adsorption capacity. The preparation of the adsorbent involved carbonization followed by chemical activation using 3 M hydrochloric acid (HCl). The study evaluated the optimal adsorption time and adsorbent dosage for the treatment of used cooking oil. The results demonstrated that the optimum adsorption time was 90 minutes, reducing the free fatty acid (FFA) content from 5.12% to 1.02%, while odor and color intensity decreased by 87%. The optimum adsorbent dosage was 1.5 g, which exhibited the highest effectiveness in improving the quality of the used cooking oil. These findings suggest that eggshell-derived adsorbents offer a sustainable and environmentally friendly approach to managing used cooking oil waste while simultaneously valorizing organic eggshell waste as a low-cost adsorbent material.]]>
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