SUMMARY White jabon fruit (Anthocephalus cadamba) is a less than optimal utilization of biomass. White jabon fruit contains good cellulose as a base for making activated charcoal which is used as an adsorbent in the Hg2+ ion adsorption process. Therefore, this study aims to determine the optimum environmental characteristics and pH of the adsorption power of mercury ions (Hg2+). Activated char…