Characterization of Eggshell Combination with Activated Corn Cob as Ion Pb2+ Adsorbent through a Batch Process

Abstract

This study aims to determine the characteristics of the combination of corn cobs and eggshells as Pb metal adsorbents. In this research, adsorption using the Batch method. This research uses an experimental approach in the laboratory. This experiment has four stages: adsorbent preparation, adsorbent activation, characterization of adsorbent functional groups using FTIR, and characterization of adsorbent to adsorb the ion Pb2+. The adsorption isotherm was determined using the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm patterns. While the determination of adsorption effectivity through optimum conditions on variations in adsorbent composition, adsorbent mass, contact time, and the effect of initial concentration of Pb metal on adsorption capacity are carried out using AAS. The results showed that the adsorbent combination of corn cobs and eggshells contained OH, CaCO32- groups, cellulose and protein constituent groups that played a role in the adsorption process, using the Langmuir isotherm pattern, which means the adsorption process takes place chemically. The optimum composition ratio of the adsorbent corn cobs and eggshells is 1: 2, the optimum mass of adsorbent was 0.2 g, and the contact time optimum is 60 minutes, with the optimum percentage of Pb2+ adsorbed in those conditions are 94.49%, 98.69 %, 99.03%, respectively. The more the initial concentration of Pb metal, the greater the adsorption capacity, and in this study, the largest adsorption capacity at a concentration of 30 ppm with a value of 1.393445 mg/g.