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Study on the adsorption properties of novel crown ether crosslinked chitosan for metal ions
Author(s) -
Wan Lili,
Wang Yuting,
Qian Shahua
Publication year - 2002
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.10180
Subject(s) - crown ether , selectivity , chitosan , metal ions in aqueous solution , adsorption , ether , aqueous solution , chemistry , fourier transform infrared spectroscopy , nuclear chemistry , metal , schiff base , polymer chemistry , materials science , ion , organic chemistry , chemical engineering , catalysis , engineering
We first synthesized N ‐benzylidene chitosan (CTB) by the reaction of benzaldehyde with chitosan (CTS). Chitosan‐dibenzo‐18‐crown‐6 crown ether bearing Schiff‐base group (CTBD) and chitosan‐dibenzo‐18‐crown‐6 crown ether (CTSD) were prepared by the reaction of 4,4′‐dibromodibenzo‐18‐crown‐6 crown ether with CTB and CTS, respectively. Their structures were confirmed by Fourier transform infrared spectral analysis and X‐ray powder diffraction analysis. These novel crown ether crosslinked CTSs have space net structures with embedded crown ethers and contain the double structures and properties of CTS and crown ethers. They have stronger complexation with and better selectivity for metal ions than corresponding crown ethers and CTS. Moreover, these novel CTS derivatives can be used to separate and preconcentrate heavy or precious metal ions in aqueous environments. From this practical viewpoint, we studied the adsorption and selectivity properties of CTB, CTBD, and CTSD for Ag + , Cu 2+ , Pb 2+ , and Ni 2+ . The experimental results showed that CTBD had better adsorption properties and higher selectivity for metal ions than CTSD. For aqueous systems containing Pb 2+ –Ni 2+ and Pb 2+ –Cu 2+ , the selectivity coefficients of CTSD and CTBD were K Pb 2+/Ni 2+ = 24.4 and K Pb 2+/Cu 2+ = 41.4 and K Pb 2+/Ni 2+ = 35.5 and K Pb 2+/Cu 2+ = 55.3, respectively. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 29–34, 2002; DOI 10.1002/app.10180