Removal of Pb2+ ions from Aqueous Solutions by Adsorption on the Raw Beet Pulp

Elanza S, Lebkiri A and Rifi E

Abstract

The present work concerns the removal of Pb2+ ions from aqueous solutions diluted by adsorption on raw beet pulp (BP). The adsorption kinetic at pH=5.5 shows that the adsorption equilibrium is reached at 80 min. But the kinetic of desorption of metal ions on the acid solutions is very fast, and we have about ten minutes of agitation of systems to achieve the equilibrium. The maximum adsorption capacity of Pb2+ by BP is of the order of 2.55 mg/g. The effect of the temperature on the adsorption shows the adsorption of Pb2+ ions is endothermic in nature. The treatment of a mixture of metals shows that the BP presents the sequence of following selectivity: Pb2+>Cd2+>Zn2+>Cu2+>Co2+. The study of the regeneration of this material, after desorption of the metal ions by bringing it into contact with dilute acid solution shows that this material has good mechanical properties, and can be regenerated and repeatedly reused in the process of treating the metal solutions.