<![CDATA[Repeated heating of cooking oil promotes hydrolytic and oxidative degradation, resulting in elevated levels of peroxide compounds and free fatty acids (FFAs) that compromise oil quality. In this study, Natar clay was treated with a hydrolyzed aluminum-based solution prepared from AlCl3 and KOH, followed by thermal treatment, and evaluated as an adsorbent for reducing peroxide value and FFA content in waste cooking oil. The structural, morphological, and textural characteristics of the treated clay were analyzed using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and nitrogen adsorption-desorption analysis. The treated Natar clay exhibited reflections attributable to a kaolinite-related phase with aggregated pseudohexagonal plate-like particles. The specific surface area and pore volume of treated Natar clay were 60.994 m2/g and 0.237 cm3/g. Adsorption treatment reduced the peroxide value from 37.80 to 4.50 meq O2/kg and decreased the FFA content from 0.40 ± 0.01% to 0.08 ± 0.02%, corresponding to reductions of 88% and 80%, respectively. These results demonstrate the potential of Natar clay treated with an aluminum-based solution as a locally sourced adsorbent for improving the quality of waste cooking oil.]]>
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