Sorption kinetics of Pb2+ and Cu2+ ions from aqueous solution by Nipah palm (Nypa fruticans Wurmb) shoot biomass

• Donbebe Wankasi ^[1] ; Michael Horsfall Jnr ^[1] ; Ayabaemi Ibuteme Spiff ^[1]
  1. [1] University of Port Harcourt

     University of Port Harcourt

     Nigeria

     
• Localización: Electronic Journal of Biotechnology, ISSN-e 0717-3458, Vol. 9, Nº. 5, 2006
• Idioma: inglés
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• Resumen

  • 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 30ºC. 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.