Equilibrium Sorption Study of Al3+, Co2+ and Ag+ in Aqueous Solutions by Fluted Pumpkin
(Telfairia Occidentalis HOOK f) Waste Biomass

Michael Horsfall Jnr* and Ayebaemi I. Spiff
Department of Pure and Industrial Chemistry, University of Port Harcourt, Uniport P. O. Box 402, Choba, Port Harcourt, Nigeria, E-mail: horsfalljnr@yahoo.com

An ensemble of equilibrium sorption techniques was combined to study the influence of ionic radius on the sorption characteristics of Al3+, Co2+ and Ag+ by fluted pumpkin waste biomass. The experimental results were analyzed in terms of five two-parameter adsorption isotherm equations - the Langmuir, Freundlich, Temkin, Dubinin-Radushkevich and Flory-Huggins isotherms. According to the evaluation using Langmuir equation, the monolayer sorption capacity obtained was 16.98 mg/g, 10.34 mg/g and 8.03 mg/g for Al3+, Co2+ and Ag+ respectively. The data further showed that, the Freundlich and Langmuir isotherms described the data appropriable than Temkin, Dubinin-Radushkevich and Flory-Huggins isotherms. The result showed that fluted pumpkin waste could be used for the removal of Al3+, Co2+ and Ag+ from wastewater and ionic radius influence the rate of metal ion migration to the biomass surface and the adsorption intensity of the metal.

Key words: Equilibrium sorption, Flory-Huggins isotherm, fluted pumpkin, wastewater treatment, process biotechnology