TY - JOUR
T1 - Adsorption of copper(II) ions by a chitosan-oxalate complex biosorbent
AU - Mi, Fwu Long
AU - Wu, Shao Jung
AU - Lin, Fu Ming
PY - 2015
Y1 - 2015
N2 - 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.
AB - 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.
KW - Biosorbent
KW - Chitosan
KW - Oxalic acid
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U2 - 10.1016/j.ijbiomac.2014.08.006
DO - 10.1016/j.ijbiomac.2014.08.006
M3 - Article
C2 - 25138540
AN - SCOPUS:84906761454
SN - 0141-8130
VL - 72
SP - 136
EP - 144
JO - International Journal of Biological Macromolecules
JF - International Journal of Biological Macromolecules
ER -