Ningrum, R. A.; Salawali, R. T.; Arief, M. D.; A'ban, J. G.; Mahdiah, M. Physical-Chemical Characterization of Activated Charcoal from Coconut Shells As an Adsorbent in Reducing Ammonia (NH₃) Levels in Industrial Liquid Waste. satera 2026, 4, 1-8.