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|Title:||A novel amine-shielded surface cross-linking of chitosan hydrogel beads for enhanced metal adsorption performance||Authors:||Li, N.
|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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