White jabon fruit powder (Anthocephalus cadamba Miq.) can be used as a biosorbent because it contains cellulose. The white jabon fruit powder was activated with NaOH and combined using peat water to increase the surface area and multiply the active sites on the biosorbent. This study aims to determine the biosorbent dose, pH, pHpzc and optimum contact time of the combination of white jabon frui…