Windari, Sri Artika2024-03-142024-03-142023-11PerpustakaanElfitrahttps://repository.unri.ac.id/handle/123456789/11363This research aims to determine the efficiency and optimum adsorption capacity for variations in pH, contact time, and adsorbate concentration of white jabon bark powder in the adsorption of lead (II) ions. White jabon bark powder was activated using NaOH in a ratio of 1:0, 1:1, 1:2, 1:3, 1:4, and 1:5 (w/w), which was characterized using iodine adsorption capacity and methylene blue adsorption capacity. The powder that is activated with the optimum NaOH ratio is then coated with humic acid from peat water. White jabon bark powder was optimized for pH parameters, contact time, and adsorbate concentration. The results of the characterization of determining the optimum NaOH ratio in this study showed that the iodine adsorption capacity in the ratio 1:3 (w/w) was 294.8037 mg/g and the methylene blue adsorption capacity was 21.3484 mg/g with a surface area of 79.1540 m2/g. The adsorption results obtained showed that the optimum conditions for Jabon bark powder were a pH variation of 4, a contact time of 30 minutes, and an adsorbate concentration of 140 mg/L with a biosorption efficiency of 99.47% and a biosorption capacity of 6.6043 mg/g. Based on the FTIR results, there are C-H, C-O, C-N, C=C aromatic, C-H stretching, and O-H functional groups. SEM-EDS results showed that jabon bark powder contained the elements C, O, Ca, K, Mg, Na, and Cl, and there were many impurities covering the pores of the powder. The powder surface looks cleaner and more open after activation.enadsorptionjabonleadArticle