Electronic Journal of Biotechnology
Universidad Católica de Valparaíso
Vol. 9, No. 5, 2006, pp. 587-592
Bioline Code: ej06079
Full paper language: English
Document type: Research Article
Document available free of charge
Electronic Journal of Biotechnology, Vol. 9, No. 5, 2006, pp. 587-592
© Copyright 2006 - Pontificia Universidad Católica de Valparaíso -- Chile
Sorption kinetics of Pb2+ and Cu2+ ions from aqueous solution by Nipah palm ( Nypa fruticans Wurmb) shoot biomass|
Wankasi, Donbebe; Horsfall, Michael Jnr & Spiff, Ayabaemi Ibuteme
The sorption kinetics of Pb2+ and Cu2+ ions in aqueous solution by unmodified and mercaptoacetic acid modified biomass of Nypa fruticans shoot has been investigated. The equilibrium sorption capacity of Pb2+ and Cu2+ was determined from the Langmuir equation and found to be 15.59 mg/g and 21.85 mg/g for unmodified biomass and 52.86 mg/g and 66.71 mg/g for modified biomass at 30°C. The time dependent studies showed relatively rapid sorption of 5 - 10 min to reach equilibrium for both metal ions. A batch sorption model, based on the assumption of the pseudo-second-order mechanism, was applied to predict the rate constants (g mg-1 min-1), which were found to be 3.59 x 10-4 (Pb2+) and 1.85 x 10-4 (Cu2+) and 2.82 x 10-2 (Pb2+) and 3.67 x 10-2 (Cu2+) on unmodified and mercaptoacetic acid modified biomass respectively. The activation energy of the sorption of Pb2+ and Cu2+ on Nypah palm reveals an endothermic process.
adsorption, heavy metal binding, Nipah palm.
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