Yusmartini, E.S. (2025) “Characterization and Adsorption Effectiveness of Coconut Shell-Activated Carbon/Fe₃O₄ as Novel-Adsorbent on Copper Removal from Wastewater”, Global Journal of Engineering and Technology Research, 1(04), pp. 193–198. doi:10.65150/EP-gjetr/V1E4/2025-05.