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Lauric Acid Adsorption Using HСl-Enhanced Rice Husk Ash: A Path to Waste Frying Oil Purification

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Abstract:

Waste frying oil (WFO) is a major byproduct of food preparation, containing elevated levels of free fatty acids (FFA), which reduce its potential for reuse in biodiesel production and other applications. This study investigates the use of hydrochloric acid (HCl)-pretreated rice husk ash (RHA) as an adsorbent for removing FFAs, with lauric acid as a model FFA. RHA pre-treated with different HCl concentrations (1 – 5 M) was synthesized and characterized using SEM-EDS and FTIR. SEM analysis revealed that acid treatment improved surface roughness and porosity, while EDS confirmed an increase in silica content, particularly in RHA treated with 4M HCl. FTIR identified key functional groups that contributed to FFA adsorption. Batch adsorption experiments demonstrated the effect of HCl concentration, adsorbent dosage, and initial FFA concentration on adsorption capacity and removal efficiency. The study shows that acid pre-treatment enhances RHA's adsorption properties, offering a potential solution for the sustainable management of WFO and improving its applicability in purification processes.

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Periodical:

Key Engineering Materials (Volume 1028)

Pages:

67-72

DOI:

https://doi.org/10.4028/p-Sw3VTP

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Online since:

October 2025

Authors:

Faizzatul Najwa Othman, Peng Yong Hoo*, Ahmad Zuhairi Abdullah, Qi Hwa Ng, Siew Hoong Shuit, Siti Kartini Enche Ab Rahim, Jeyashelly Andas

Keywords:

Acid Pretreatment, Adsorption, Free Fatty Acids, Rice Husk Ash, Waste Frying Oil

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© 2025 Trans Tech Publications Ltd. All Rights Reserved

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