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Updated: Apr 25, 2026

Preparation of Expanded Chitin Foams and their Use in the Removal of Aqueous Copper
Published on: February 27, 2021
Adsorption of copper(II) ions by a chitosan-oxalate complex biosorbent
Fwu-Long Mi1, Shao-Jung Wu2, Fu-Ming Lin2
1Department of Biochemistry and Molecular Cell Biology, School of Medicine, Taipei Medical University, Taipei 110, Taiwan; Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei 110, Taiwan.
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 (ΔG°<0 and ΔH°>0) indicated a spontaneous and endothermic adsorption process. The COCB bioadsorbent exhibited fast adsorption rate and high adsorption capacity for Cu(II) uptake.
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