Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 166, Issue 1, Pages 508-513Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2008.11.045
Keywords
Adsorption; Beads; Chitosan; Cross-linking; Nitrate
Categories
Funding
- Korea Science and Engineering Foundation (KOSEF) through the Advanced Environmental Biotechnology Research Center [R11-2003-006]
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The investigation of adsorption of nitrate onto chitosan beads modified by cross-linking with epichlorohydrin (ECH) and surface conditioning with sodium bisulfate was performed. The results indicated that both cross-linking and conditioning increased adsorption capacity compared to normal chitosan beads. The maximum adsorption capacity was found at a cross-linking ratio of 0.4 and conditioning concentration of 0.1 mM NaHSO4. The maximum adsorption capacity was 104.0 mg g(-1) for the conditioned cross-linked chitosan beads at pH 5, while it was 90.7 mg g(-1) for normal chitosan beads. The Langmuir isotherm model fit the equilibrium data better than the Freundlich model. The mean adsorption energies obtained from the Dubinin-Radushkevich isotherm model for all adsorption systems were in the range of 9.55-9.71 kJ mol(-1), indicating that physical electrostatic force was potentially involved in the adsorption process. (C) 2008 Elsevier B.V. All rights reserved.
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