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This study aims to evaluate the effectiveness of thermally treated mortar as an adsorbent to reduce free fatty acids in waste cooking oils.

July 10, 2026ACS OmegaOpen Access

Reduction of Free Fatty Acids in Waste Frying Oil Using Thermally Treated Mortar

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Randomized trial demonstrates a 78% reduction of free fatty acids in waste cooking oils, suggesting an efficient biodiesel production method.

This study aims to evaluate the effectiveness of thermally treated mortar as an adsorbent to reduce free fatty acids in waste cooking oils.
Evaluated thermally treated mortar at 850 °C as a low-cost adsorbent.
Conducted material characterization using SEM-EDS and FTIR.
Utilized a Central Composite Rotatable Design with 17 experimental runs to optimize conditions.
Achieved a 78% reduction in acid value, reaching approximately 0.55 mg KOH.g –1.
Adsorption capacity was 81.67 mg.g –1 under optimized conditions.
Kinetic modeling indicated a best fit with the pseudo-second-order model (R 2 = 0.97893).

Nascimento et al. (2026) studied this question.

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Randomized trial demonstrates a 78% reduction of free fatty acids in waste cooking oils, suggesting an efficient biodiesel production method.