2024. Modification of Coal Fly Ash Waste into Manganese-Oxide-Coated-Zeolite (MOCZ) to Adsorb Heavy Metal Ions Ni2+. Jurnal Kimia Valensi. 10, 1 (Jun. 2024), 133 – 144. DOI:https://doi.org/10.15408/jkv.v10i1.35794.