title: Characterization and bisphenol A adsorption capacity of β-cyclodextrin-carboxymethylcellulose-based hydrogels.
abstract: Novel hydrogel beads having molecular adsorption abilities were prepared from carboxymethylcellulose sodium salt (CMC) and β-cyclodextrin (β-CD) by suspension crosslinking, using ethylene glycol diglycidyl ether (EGDE) in basic medium as a crosslinking agent. FTIR and solid-state NMR spectroscopic analysis revealed that the amount of incorporated β-CD and crosslinking densities within the hydrogel bead structures are strongly dependent on the molar feed ratio of β-CD to CMC during preparation. The hydrogel beads showed water-swelling capacities of 70-200 mL/g-polymer, with decreases in capacity associated with increased amounts of β-CD incorporated in the gel structure. The hydrogel beads also showed a high adsorption capacity toward bisphenol A (BPA) in water. Batch BPA-adsorption experiments were analyzed employing Langmuir isotherm models; hydrogel bead adsorption isotherms for BPA could be fitted to the Langmuir model. The maximum BPA-adsorption among the prepared series of hydrogel beads amounted to 167 μmol g(-1).
authors.affiliation: Department of Science and Engineering for Materials, Tomakomai National College of Technology, Nishikioka 443, Tomakomai, Hokkaido 059-1275, Japan. kono@sem.tomakomai-ct.ac.jp
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kono
authors.forename: Kenta
authors.initials: K
authors.lastname: Onishi
authors.forename: Taichi
authors.initials: T
authors.lastname: Nakamura
mesh_terms: D000327:Adsorption; D001559:Benzhydryl Compounds / Q000737:chemistry*; D002266:Carboxymethylcellulose Sodium / Q000737:chemistry*; D004785:Environmental Pollutants / Q000737:chemistry*; D004853:Epoxy Resins / Q000737:chemistry*; D020100:Hydrogels / Q000737:chemistry*; D010636:Phenols / Q000737:chemistry*; D047392:beta-Cyclodextrins / Q000737:chemistry*; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D002266:Carboxymethylcellulose Sodium; D004785:Environmental Pollutants; D004853:Epoxy Resins; D020100:Hydrogels; D010636:Phenols; D047392:beta-Cyclodextrins; C035364:Quetol 651; C006780:bisphenol A; D000098826:Bisphenol A Compounds
keywords: AGU; Adsorption; BPA; Bisphenol A; CD; CMC; Carboxymethylcellulose; Cyclodextrin; DS; ECH; EGDE; FTIR; Fourier transform infrared spectroscopy; Hydrogel beads; NMR; anhydroglucose unit; bisphenol A; cyclodextrin; degree of substitution; epichlorohydrin; ethylene glycol diglycidyl ether; nuclear magnetic resonance; sodium carboxymethylcellulose