Gala, D.S. et al. 2025. Application of Silica Adsorbent Rice Husk Ash-Activated Carbon in Refining Waste Cooking Oil. Hydrogen: Jurnal Kependidikan Kimia. 13, 1 (Mar. 2025), 197–208. DOI:https://doi.org/10.33394/hjkk.v13i1.14802.