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Reference type: Journal
Authors: Chen AH, Yang CY, Chen CY, Chen CY, Chen CW
Article Title: The chemically crosslinked metal-complexed chitosans for comparative adsorptions of Cu(II), Zn(II), Ni(II) and Pb(II) ions in aqueous medium.
Publication date: 2009
Journal: Journal of Hazardous Materials
Volume: 163
Issue: (2-3)
Page numbers: 1068-1075.
DOI: 10.1016/j.jhazmat.2008.07.073
Alternative URL: http://www.sciencedirect.com/science/article/B6TGF-4T26387-4/2/81ad09d9f72d234bbc34e0bfd6e0f2fe

Abstract: The chemically crosslinked metal-complexed chitosans were synthesized by using the ion-imprinting method from a chitosan with four metals (Cu(II), Zn(II), Ni(II) and Pb(II)) as templates and glutaraldehyde as a crosslinker. The influences of adsorption conditions, including molar ratios of crosslinker/chitosan and pH changes, were studied. They were used to investigate for comparative adsorptions of Cu(II), Zn(II), Ni(II) and Pb(II) ions in an aqueous medium. They were demonstrated the comparative adsorptions of Cu(II), Zn(II), Ni(II) and Pb(II) ions in the orders of the adsorbed amounts with templates: Cu(II) ~ Pb(II) > Zn(II) ~ Ni(II), Zn(II) > Cu(II) ~ Pb(II) > Ni(II), Ni(II) > Pb(II) > Zn(II) > Cu(II) and Pb(II) ~ Cu(II) > Zn(II) > Ni(II), respectively. In addition, the dynamical study showed to be well followed the second-order kinetic equation in the adsorption process. At the same time, the equilibrium adsorption data were fitted in three adsorption isotherm models, namely, Langmuir, Freundlich, and Dubinin-Radushkevich to show very good fits in the Langmuir isotherm equation for the monolayer adsorption process. The most important aspect of the chemically crosslinked metal-complexed chitosans with glutaraldehyde demonstrated to afford a higher adsorption capacity, and a more efficient adsorption toward metals in an aqueous medium
Template and target information: copper ion, zinc ion, nickel ion, lead ion, Cu(II), Zn(II), Ni(II), Pb(II)
Author keywords: Crosslinked metal-complexed chitosan, adsorption capacity, metal, adsorption isotherm, Comparative adsorption

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