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

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.

journal_name

Int J Biol Macromol

journal_title

International journal of biological macromolecules

authors

Mi FL,Wu SJ,Lin FM

doi

10.1016/j.ijbiomac.2014.08.006

subject

Has Abstract

pub_date

2015-01-01 00:00:00

pages

136-44

eissn

0141-8130

issn

1879-0003

pii

S0141-8130(14)00539-X

journal_volume

72

pub_type

杂志文章

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