N. I. Mohamad Ketar@Mokhtar and H. Harun, “Synthesis of Magnetic Biochar Derived from Oil Palm Frond for Waste Cooking Oil Treatment”, peat, vol. 2, no. 2, pp. 116–126, Dec. 2021, Accessed: Apr. 07, 2026. [Online]. Available: https://publisher.uthm.edu.my/periodicals/index.php/peat/article/view/944