Binding of heavy metal contaminants onto chitosans – An evaluation for remediation of metal contaminated soil and water

Kamari, A., Pulford, I.D. and Hargreaves, J.S.J. (2011) Binding of heavy metal contaminants onto chitosans – An evaluation for remediation of metal contaminated soil and water. Journal of Environmental Management, 92(10), pp. 2675-2682. (doi:10.1016/j.jenvman.2011.06.005)

Full text not currently available from Enlighten.

Publisher's URL: http://dx.doi.org/10.1016/j.jenvman.2011.06.005

Abstract

The binding efficiency of chitosan samples for Ag<sup>+</sup>, Cd<sup>2+</sup>, Cu<sup>2+</sup>, Pb<sup>2+</sup> and Zn<sup>2+</sup> has been evaluated in order to consider their application to remediate metal contaminated soil and water. The sorption behaviour of metal ions was assessed using a batch technique at different contact time and initial metal concentration with different background electrolytes. The kinetics followed a pseudo-second-order model, while the equilibrium data correlated well with the Freundlich and Langmuir isotherm models. For example, the maximum sorption capacity (Q) for chitosan was estimated as 1.93 mmol/g for Ag<sup>+</sup>, 1.61 mmol/g for Cu<sup>2+</sup>, 0.94 mmol/g for Zn<sup>2+</sup>, 0.72 mmol/g for Cd<sup>2+</sup> and 0.64 mmol/g for Pb<sup>2+</sup>. Covalent interaction between metal ions and functional groups (amino and hydroxyl) of the chitosans was the main binding mechanism. Ion exchange is not an important process. Chitosan and cross-linked chitosans were able to bind metal ions in the presence of K<sup>+</sup>, Cl<sup>−</sup> and NO<sub>3</sub><sup>−</sup>. The nature of Cl<sup>−</sup> and NO<sub>3</sub><sup>−</sup> ions did not affect Zn<sup>2+</sup> binding by the chitosans. Even at 11x dilution, the chitosans were able to retain metal ions on their surfaces.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Pulford, Dr Ian and Hargreaves, Professor Justin
Authors: Kamari, A., Pulford, I.D., and Hargreaves, J.S.J.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Journal of Environmental Management
ISSN:0301-4797
Published Online:25 June 2011

University Staff: Request a correction | Enlighten Editors: Update this record