Absorption characterization of Ca2+, Na+, and K+ on irradiation crosslinked carboxymethyl sago pulp hydrogel |
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| Authors: | Vengidesh Pushpamalar Steven James Langford Mansor Ahmad Kamaruddin Hashim Yau Yan Lim |
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| Affiliation: | 1. School of Science, Monash University Sunway Campus, Jalan Lagoon Selatan, 46150 Bandar Sunway, Petaling Jaya, Selangor, Malaysia;2. School of Chemistry, Monash University, Clayton, Victoria 3800, Australia;3. Department of Chemistry, University Putra Malaysia, 43400 Serdang, Selangor, Malaysia;4. Radiation Modification of Polymer Group, Radiation Processing Technology Division, Malaysian Nuclear Agency, Bangi 43000, Kajang, Selangor, Malaysia |
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| 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 CaCl2. 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 Ca2+ 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 |
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| Keywords: | absorption crosslinking electron beam irradiation hydrogels hydrophilic polymers |
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