M. Zubir, Z. Muchtar, Mahmud, H.I. Nasution, Jasmidi
This study aims to determine the capacity of Jatropha leaves to absorb Pb (II), Cd (II) and their mixture in liquid waste. Jatropha leaves were obtained from Durian, Labu Beach, North Sumatra, heated for 4 hours and 24 hours, then characterized by XRD, FTIR, and SEM. XRD and FTIR spectra confirmed there are no structural differences of Jatropha leaf biosorbent with 4 hours and 24-hour pretreatment. SEM images indicate that the surface of the biosorbent prepared for 24 hours is smoother than the 4-hour preparation. The number of Jatropha leaves which absorbed Pb (II) and Cd (II) were measured with AAS and the optimum concentration of 0.5 gram of adsorbent for Pb (II) is 80 ppm (90 minutes) adsorbed up to 95.52%. It is higher than the absorption of Cd(II) which is 76.37% at a concentration of 100 ppm (90 minutes). But the mixture of Pb (II) and Cd (II) induce the opposite result. Cd (II) was absorbed more by 92.48% while Pb (II) was 88.62% at a concentration of 100 ppm for 90 minutes. Although Pb (II) can be absorbed more than Cd (II), when the two heavy metals mixed, Cd (II) is absorbed more than Pb (II). © 2020 IOP Publishing Ltd. All rights reserved.
Chemistry Department, Universitas Negeri Medan, Medan, North-Sumatera, 20221, Indonesia
