Moondra Zubir
Jatropha leaves from Pantai Labu, North Sumatera, were prepared for the selective absorption of Pb2+ and Cd2+ in their mixture system. FTIR spectra of prepared Jatropha curcas leaves indicate the content of organic groups as -OH, -CN and -CO groups, which can be used to determine the reduction of Pb and Cd ions by J. curcas leaves in liquids. Pb2+ was adsorbed in the single system, which maximum adsorbed amount in a solution of 100mg Pb2+ L-1 and 60min contact time is 4.72mg g-1, which was higher than that of Cd2+ (4.42mg g-1) at 100mg L-1 ion solution for 90min. Interestingly, in the mixture solution of both Pb and Cd ions, Cd2+ was adsorbed as 2.64mg g-1 which higher than Pb2+adsorption amount is 2.11mgg-1 at 100mg kg-1 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. Jatropha curcas leaves show preferential adsorption properties because of the existence of Pb2+ and Cd2+ in liquid waste. Pb2+ ions were adsorbed higher than Cd2+ in single system due to Pb2+, as hard acid, has a stronger interaction with functional groups in J. curcas leaves. Pb2+ reached saturated value with lower initial concentration of solution and also faster contact time needed to get the higher adsorption amount compare to Cd2+. However, the opposite phenomena found in the mixture system of mixture Pb2+ and Cd2+ solution. Even in initial stage, Pb2+ was adsorbed higher than Cd2+, but by increasing initial concentration and contact time Cd2+ adsorption amount exceed Pb2+ which indicates Pb2+ ion radius, which is higher than that of Cd2+, provides a negative effect when their existence together in the same solution. J. curcas leaves can be a new proposal of Pb2+ and Cd2+ removal in liquid solutions with their concurrent existence in liquid waste. © 2021 Nova Science Publishers, Inc.
Department of Chemistry, State University of Medan, North Sumatera, Indonesia
