Please use this identifier to cite or link to this item: https://doi.org/10.1021/ie050145k
Title: A novel amine-shielded surface cross-linking of chitosan hydrogel beads for enhanced metal adsorption performance
Authors: Li, N. 
Bai, R. 
Issue Date: 17-Aug-2005
Citation: Li, N., Bai, R. (2005-08-17). A novel amine-shielded surface cross-linking of chitosan hydrogel beads for enhanced metal adsorption performance. Industrial and Engineering Chemistry Research 44 (17) : 6692-6700. ScholarBank@NUS Repository. https://doi.org/10.1021/ie050145k
Abstract: A new amine-shielded cross-linking method of the chitosan hydrogel beads (CHBs) was investigated to improve the metal adsorption performance of the cross-linked beads. The CHBs were reacted with formaldehyde before the beads were cross-linked with EGDE, and, finally, the amine groups of cross-linked CHBs were released by HCl treatment. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy clearly showed that most of the amine groups in chitosan were converted to the -N=CH 2 groups after the formaldehyde treatment and they were not involved in the cross-linking reaction with EGDE, and the HCl treatment after the cross-linking reaction effectively released these shielded nitrogen atoms into the form of the primary amine again. Copper ion adsorption experiments confirmed that the CHBs cross-linked with the new method had significantly greater adsorption capacities than the beads cross-linked directly with EGDE. Mechanism study revealed that the increased adsorption performance was attributed to the large number of primary amine groups available on the surfaces of the cross-linked beads from the new cross-linking method. © 2005 American Chemical Society.
Source Title: Industrial and Engineering Chemistry Research
URI: http://scholarbank.nus.edu.sg/handle/10635/88467
ISSN: 08885885
DOI: 10.1021/ie050145k
Appears in Collections:Staff Publications

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