Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
581907 | Journal of Hazardous Materials | 2009 | 6 Pages |
Abstract
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 gâ1 for the conditioned cross-linked chitosan beads at pH 5, while it was 90.7 mg gâ1 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 molâ1, indicating that physical electrostatic force was potentially involved in the adsorption process.
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Authors
Sudipta Chatterjee, Dae S. Lee, Min W. Lee, Seung H. Woo,