Adsorption of copper(II) ions by a chitosan-oxalate complex biosorbent

Fwu Long Mi, Shao Jung Wu, Fu Ming Lin

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44 Citations (Scopus)

Abstract

Oxalic acid, an effective metal-chelating ligand, is abundant in natural resources. In this study, a chitosan-oxalate complex biosorbent (COCB) was prepared by an iontropic cross-linking method. The COCB beads were characterized by Fourier transform infrared (FT-IR) spectra, X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The XRD analysis shows that Cu(II) ions can form complexes with chitosan and oxalate. Adsorption of Cu(II) ions onto COCB beads was pH-dependent. The isothermal adsorption data fitted well to Langmuir equation with the maximum adsorption capacities of 227.27. mg/g for porous COCB beads and 175.44. mg/g for non-porous COCB beads at pH 5.0. The adsorption kinetics described by the pseudo-second-order diffusion models, suggesting that the rate-limiting step in adsorption was chemical sorption. Thermodynamic parameters (δ. G°. . 0) indicated a spontaneous and endothermic adsorption process. The COCB bioadsorbent exhibited fast adsorption rate and high adsorption capacity for Cu(II) uptake.

Original languageEnglish
Pages (from-to)136-144
Number of pages9
JournalInternational Journal of Biological Macromolecules
Volume72
DOIs
Publication statusPublished - 2015

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Keywords

  • Biosorbent
  • Chitosan
  • Oxalic acid

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Structural Biology
  • Medicine(all)

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