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Properties and adsorptive capacity of amino acids modified chitosans for copper ion removal
Author(s) -
DehonorGómez Mariamne,
HernándezEsparza Margarita,
RuizTreviño F. Alberto,
ContrerasReyes Roberto
Publication year - 2003
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200350725
Subject(s) - chemistry , adsorption , chitosan , catalysis , langmuir adsorption model , chemical modification , sulfuric acid , amide , amino acid , nuclear chemistry , inorganic chemistry , polymer chemistry , organic chemistry , biochemistry
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 Cu 2+ 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 Cu 2+ 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.