Adsorption selectivity of Jatropha curcas leaves on Pb(II) and Cd(II) mixture contaminant removal in liquid waste

Abstract Jatropha leaves from Durian, Labu Beach, North Sumatera was prepared as a biosorbent for the selectivity absorption of Pb2+ and Cd2+ in their mixture system. Jatropha curcas leaves was prepared by heating at 105 oC for 4h, then characterized by XRD and FTIR. FTIR spectra indicate the content of organic groups as -OH, -CN and -CO groups in their function to reduce of Pb and Cd ions in liquid contaminant. Pb2+ and Cd2+ were adsorbed in the single system obtained as optimum amount of Pb2+ at 100 mgL-1 and 60 min contact time is 4.72 mgg-1 which higher than Cd2+ as 4.42 mgg-1 at 100 mgL-1 ion solution for 90 min. Interestingly, in the mixture solution of Pb and Cd ions, Cd2+ was adsorbed as 2.64 mgg-1 which higher than Pb2+ adsorption amount as 2.11 mgg-1 at 100 ppm solution and adsorption time for 90 min. It indicates the mixture content of Pb and Cd ions in liquid solution shows a preferential adsorption properties compared with their single system adsorption.