| Autor: |
Dehonor‐Gómez, Mariamne, Hernández‐Esparza, Margarita, Ruiz‐Treviño, F. Alberto, Contreras‐Reyes, Roberto |
| Zdroj: |
Macromolecular Symposia; July 2003, Vol. 197 Issue: 1 p277-288, 12p |
| Abstrakt: |
This work presents the results of the modification of lateral groups of chitosan (2‐amino‐2‐desoxy‐β‐D‐glucose) by the reaction with different amino acids (glycine, L‐lysine, ‐glutamic acid and L‐isoleucine) under acid catalysis. The Cu2+adsorption capacity of pure chitosan and of the chemically modified chitosans were also evaluated. The modification reaction favored the amide formation of the C‐2 carbon of the glycoside ring under the adopted reaction conditions: reaction time and temperature and using sulfuric acid as a catalyst. The Cu2+adsorption kinetics and equilibrium response using pure chitosan and the chemically modified chitosans as adsorbents showes that the adsorption capacity of equilibrium depended on the initial ion concentration. The response of each adsorbent gave good correlation with Langmuir's isotherm model. The following maximum adsorption capacity constants were obtained: 172.4 mg/g for chitosan and 69.9, 34.4, and 26.7 mg/g for modified chitosan with glycine, L‐glutamic acid, and L‐lysine, respectively. The adsorptive capacity seems to be dependent on the length and complexity of the added group. |
| Databáze: |
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