Optimum conditions for bioadsorption of lead (Pb) by durian skin waste biomass (duriobzibethinus)

Abstract

The purpose of this research is to figure out what the optimum conditions are for durian skin biomass to absorb Pb from its solution. The optimum conditions were determined by determining the optimal weight, pH for biosorption, contact time for lead biosorption, and initial concentration. Atomic Absorption Spectrophotometry (AAS) was used to determine the adsorbed analyte. The durian skin used in this study came from local durian skin waste in the Parigi district of Central Sulawesi. The weight of the adsorbent was varied between 40, 60, 80, 100, and 120 mg. The contact time was varied between 20, 40, 60, 80, and 100 minutes. The pH was varied between 2, 3, 4, 5, and 6, and the concentration was varied between 50, 100, 150, 200, and 250 ppm to determine the optimum conditions for Pb adsorption. The results showed that the optimum conditions for biosorption of durian peels were 120 mg with a 92.2 percent absorption capacity, 60 minutes of contact time with a 97.89% absorption capacity, pH 5 with a 99.81 percent absorption capacity, and a concentration of 50 ppm with a 99.59% absorption capacity.