Bulletin of the Chemical Society of Ethiopia (Jun 2005)
<b>kinetic studies on the sorption of lead and cadmium ions from aqueous solutions by <i>Caladium bicolor</i> (wild cocoyam) biomass</b>
Abstract
Kinetic investigations are necessary for determining the rate of reaction and mechanism. The kinetics of the sorption of Pb2+ and Cd2+ from aqueous solution on to the biomass of C. bicolor was studied by batch equilibrium technique. The removal of the two metal ions was found to be > 60% depending on the initial metal ion concentration during the contact time. The maximum sorption was found to be 75.11 mg/g and 25.30 mg/g for Pb2+ and Cd2+ at an equilibrium contact time of 150 min. The process of uptake is governed by film-diffusion controlled pseudo-second order reversible rate kinetics. The sorption capacity at any contact time has been evaluated and a Langmuir-type model equation has been developed to predict the optimized minimum operating time to determine a specific amount of metal ion sorption.
