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Title
Lead (II) removal from aqueous solutions by adsorption onto chitosan
Authors
Doina Asandei Laura Bulgariu and Elena Bobu
Received
February 26, 2009
Published
Volume 43 Issue 4-6 April-June
Keywords
lead (II), chitosan, adsorption, removal yield, isotherms
Abstract
The adsorption behaviour of lead (II) ions from aqueous solutions onto chitosan was investigated. Adsorption experiments were performed in a batch system, at room temperature (20 ± 0.5 °C), by changing the various experimental parameters: initial solution pH, chitosan dosage, initial lead (II) concentration and contact time. The results have shown that the effectiveness of lead ions removal is mainly dependent on the initial concentration of lead ions to chitosan dosage ratio, which should be optimized by a compromise between the removal yield and cost-effectiveness of the process. The adsorption equilibrium data were analyzed by the Freundlich and Langmuir isotherm models, whose application for the mathematical description of lead (II) adsorption on chitosan indicated that the adsorption equilibrium is well-fitted to the Langmuir isotherm.
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