摘要
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 and δ. H°. >. 0) indicated a spontaneous and endothermic adsorption process. The COCB bioadsorbent exhibited fast adsorption rate and high adsorption capacity for Cu(II) uptake.
原文 | 英語 |
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頁(從 - 到) | 136-144 |
頁數 | 9 |
期刊 | International Journal of Biological Macromolecules |
卷 | 72 |
DOIs | |
出版狀態 | 已發佈 - 1月 2015 |
ASJC Scopus subject areas
- 結構生物學
- 生物化學
- 分子生物學