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Equilibrium and kinetics studies on adsorption of Zn(II) from aqueous solutions onto a graft copolymer of cross-linked starch/acrylonitrile (CLSAGCP)

Authors
Journal
Colloids and Surfaces A Physicochemical and Engineering Aspects
0927-7757
Publisher
Elsevier
Publication Date
Volume
316
Identifiers
DOI: 10.1016/j.colsurfa.2007.09.003
Keywords
  • Adsorption
  • Zn(Ii) Ions
  • Equilibrium
  • Kinetics
  • Adsorption Isotherms
Disciplines
  • Physics

Abstract

Abstract A synthetic graft copolymer of cross-linked starch/acrylonitrile was used as an adsorbent for the removal of Zn(II) ions from an aqueous solution of zinc nitrate hexahydrate (Zn(NO 3) 2·6H 2O) at different temperatures and fixed pH. The amount adsorbed increased with increasing concentration of Zn(II) ions, and with increasing temperature. The length of time taken to reach equilibrium of the adsorption of Zn(II) ions was the same at all temperatures tested. Kinetics studies showed that the adsorption process obeyed first-order reversible kinetics and the adsorption isotherms followed the Freundlich model. Furthermore, the thermodynamic parameters, i.e. standard free energy (Δ G θ ), standard enthalpy (Δ H θ ), and standard entropy (Δ S θ ), of the adsorption process were calculated, and the results are discussed in detail.

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