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Absorption characterization of Ca 2+ , Na + , and K + on irradiation crosslinked carboxymethyl sago pulp hydrogel
Author(s) -
Pushpamalar Vengidesh,
Langford Steven James,
Ahmad Mansor,
Hashim Kamaruddin,
Lim Yau Yan
Publication year - 2012
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.38342
Subject(s) - self healing hydrogels , swelling , polyelectrolyte , nuclear chemistry , ionic strength , absorption of water , materials science , polymer chemistry , sorption , irradiation , chemical engineering , chemistry , aqueous solution , adsorption , polymer , organic chemistry , composite material , engineering , physics , nuclear physics
Abstract Hydrogel of carboxymethyl sago pulp (CMSP) of various degree of substitution (DS) was prepared by electron beam irradiation of various radiation doses. The CMSP hydrogels were subjected to swelling in different ionic strength solutions of KCl, NaCl, and CaCl 2 . The CMSP hydrogels, due to its polyelectrolyte nature, were found to be highly sensitive to ionic strength of the medium. All the CMSP hydrogels showed the absorption of K + and Ca 2+ increases with the increase in the concentrations of the respective cation solutions. The cation absorption also decreases with DS and % gel fraction (%GF) of the CMSP hydrogels. Subjecting the CMSP hydrogels in NaCl results in deswelling and releases Na + to swelling medium where the Na + release increases with the increase of DS and %GF. The sorption capacity depends on the extent of crosslinking and decreases with the increase in the extent of crosslinking. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013