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Adsorption of metal cations by water‐soluble N‐alkylated disaccharide chitosan derivatives
Author(s) -
Yang TsuiChu,
Li ChinFung,
Chou ShinShou,
Chou ChengChun
Publication year - 2005
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.22000
Subject(s) - disaccharide , adsorption , chitosan , chemistry , metal , alkylation , metal ions in aqueous solution , nuclear chemistry , selective adsorption , maltose , inorganic chemistry , organic chemistry , sucrose , catalysis
In the present study, the metal‐adsorption ability of various water‐soluble chitosan derivatives prepared by N‐alkylation of chitosan with maltose, cellobiose, or lactose and with various degrees of substitution (DS) was first determined and compared with the native chitosan. The effects of the pH and reaction time on the metal‐adsorption ability and the selective metal adsorption of the disaccharide chitosan derivatives with a DS of 30–40% were further examined. Results revealed that the metal‐adsorption ability of chitosan was enhanced after N‐alkylation with the disaccharides tested and with certain DS values. All the N‐alkylated disaccharide derivatives and the native chitosan exhibited the highest adsorption for Pb 2+ and the lowest adsorption ability for Mg 2+ among all the metal ions that were tested. The DS with disaccharide affects the metal‐adsorption ability of the tested chitosan derivatives. In general, the adsorption ability of these chitosan derivatives for Cu 2+ , Pb 2+ , Fe 2+ , and Mg 2+ decreased whereas the adsorption ability for Ca 2+ , Ni 2+ , Zn 2+ , and Cd 2+ increased upon increasing the DS. Further study with disaccharide chitosan derivatives with 30–40% DS also revealed that the adsorption of Zn 2+ and Pb 2+ by these chitosan derivatives was a fairly rapid process. The Zn 2+ and Pb 2+ adsorption ability of these derivatives generally increased as the pH increased. These disaccharide chitosan derivatives also displayed the best selective adsorption for Pb 2+ in mixed solutions with Zn 2+ , Ni 2+ , and Cd 2+ . © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 564–570, 2005