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Competitive adsorption of Ag (I) and Cu (II) by tripolyphosphate crosslinked chitosan beads
Author(s) -
Mao Chunxia,
Imtiaz Syed Ahmad,
Zhang Yan
Publication year - 2015
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.42717
Subject(s) - chitosan , adsorption , amine gas treating , sorbent , bimetallic strip , fourier transform infrared spectroscopy , metal , nuclear chemistry , x ray photoelectron spectroscopy , chemistry , langmuir adsorption model , polymer chemistry , chemical engineering , organic chemistry , engineering
ABSTRACT Alkalization of chitosan before crosslinking was applied in this study to enhance the adsorption capacity of the modified chitosan. Competitive adsorption of Ag (I) and Cu (II) from bimetallic solutions was studied using the newly synthesized tripolyphosphate crosslinked alkalized chitosan beads. Results indicated that alkalization before crosslinking helps to protect amine group from crosslinking and hence increases the uptake capacity and selectively of the synthesized beads toward Ag (I). The maximum uptakes of Ag (I) and Cu (II) were 82.9 and 15.5 mg g −1 , respectively, at room temperature with an initial concentration of each metal being 2.0 mM and the sorbent dosage of 1.0 g L −1 . The uptake of Ag (I) and Cu (II) by the beads can be better described by Langmuir isotherm and pseudo‐second rate equation. Analyses from FTIR and XPS confirmed that free amine, hydroxyl, andP 3 O 10 5 −groups are involved in metal binding with amine and hydroxyl groups more selective to Ag (I). © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42717.