Nickel (II) And Lead (II) Removal from aqueous solution using Immobilized Lonchocarpus laxiflorus, Barkstem as an Adsorbent
Keywords:
Biosorption, Equilibrium isotherm, Immobilized Lonchocarpus laxiflorus, Biosorption, Equilibrium isotherm, Immobilized Lonchocarpus laxiflorus, Pb(II) and Ni (II) removal.Abstract
Batch adsorption techniques were used to study the biosorption of Lead and Nickel from aqueous solutions by immobilized Lonchocarpus laxiflorus stembark. The effects of optimum pH, contact time, metal ion concentration, biosorbent dose, solution temperature were investigated. Experimental results showed that Lonchocarpus laxiflorus stembark was effective in removing these metals from aqueous solutions as the equilibrium biosorption of both metals was attained within 20 minutes of interaction with 99% of the metals removed within this period. Sorption of these metals was dependent on pH as maximum removal was attained at pH 4 and pH 6 for Lead and Nickel ions respectively. Both the Langmuir and Freundlich isotherm models were suitable for describing the adsorption of Ni (II) and Pb (II) on Lonchocarpus laxiflorus stembark. The capacity of Lonchocarpus laxiflorus stembark for the adsorption of Ni (II) and Pb (II) was 19 and 19.54 mg/g respectively. The FTIR spectrum exhibited that Lonchocarpus laxiflorus stembark biomass structure have hydroxyl and carbonyl groups on their surfaces and the results obtained from SEM micrograph shows its surface exhibited a rough structure with irregular surface.
