Sorption of 1–Naphthol on –Cyclodextrin–Poly(ethylene Glycol) hydrogels

Abstract

Abstract:The sorption behavior of hydrogels prepared by crosslinking -cyclodextrin with poly(ethylene glycol) modified with isocyanate end groups, is analyzed by using 1-naphthol as a model molecule. Concave sorption isotherms are observed and are well described by the Freundlich isotherm model. The sorption capacity increases as does the concentration of 1-naphthol in the medium and depends on the molar mass of poly(ethylene glycol) used in the synthesis of the hydrogel and on its -cyclodextrin content.For hydrogels with the same content of -cyclodextrin, the sorption capacity decreases with increasing the molar mass of poly(ethylene glycol) used in the synthesis. The higher sorption capacity has been found for the hydrogels prepared from PEG with a molar mass of 400 g/mol and with a -cyclodextrin content between 9-12 % in weight. The sorption capacity of these samples is close to that reported for other hydrogels based on -cyclodextrin.