Kinetics of Batch Adsorption of Iron II Ions from Aqueous Solution using Activated Carbon from Nigerian Bamboo

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Author(s) Ademiluyi F. T | Ujile A .A
Pages 623-631
Volume 3
Issue 6
Date June, 2013
Keywords Nigerian Bamboo, Activated Carbon, Iron II ions, Adsorption Isotherm, Kinetics.

Abstract

Kinetics of batch adsorption of iron II ions from aqueous solution using activated carbon from waste Nigerian based Nigerian bamboo was studied. The bamboo was cut into sizes, washing and drying was carbonized at 400oC-500oC and activated at 800oC using nitric acid. The effect of process parameters such as particle size, carbon dosage, initial concentration of adsorbate and contact time were also investigated and were found to significantly affect the adsorption capacity. The adsorption process obeyed the Freundlich, Temkin and Langmuir isotherm model indicating a monolayer formation over the surface of the material. Langmuir isotherm had a better fit than Freundlich and Temkin models with maximum monolayer saturation capacity of 166.7 mg of iron II ions adsorbed per g of bamboo activated carbon. In order to determine the mechanism of sorption, kinetic data were modeled using the pseudo first order, pseudo second order kinetic equations, and intra-particle diffusion model. The pseudo second order equation was the best applicable model to describe the sorption process. Hence the pseudo second order kinetic reaction is the rate controlling step with some intra particle diffusion taking place.

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