期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 116, 期 -, 页码 255-263出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2018.05.031
关键词
Modified chitosan; Adsorption; Kinetic; Mechanism
资金
- Ministry of Higher Education Malaysia [R.J130000.7809.4F177]
In this study, the Cu(II) and Cd(II) ions removal behavior of crosslinked chitosan beads grafted poly (methacrylamide) (abbreviated as crosslinked chitosan-g-PMAm) from single metal ion solutions was investigated. The modified chitosan beads presented a remarkable improvement in acid resistance. The batch experiments demonstrated that pH of solution played a significant role in adsorption. It was found that the adsorption of Cu(II) and Cd(II) were optimum at pH 4 and pH 5, respectively. The maximum adsorption capacities for Cu(II) and Cd(II) based on Langmuir equation were 140.9 mg g(-1) and 178.6 mg g(-1), respectively. Pseudo second order gave a better fit for adsorption data with respect to linearity coefficients than pseudo-first order suggesting that chemisorption or electron transfer is the dominant mechanism of the metal ions onto crosslinked chitosan-g-PMAm. In addition, X-ray photoelectron spectroscopy (XPS) investigations revealed that adsorption of both metal ions took place on the surfaces of crosslinked chitosan-g-PMAm by chelation through C-NH2, C-O and C=O groups. Overall, the modified chitosan has proved a promising adsorbent for removal of metal ions. (C) 2018 Elsevier B.V. All rights reserved.
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