Preparation and sorption properties of tunable polyester copolymers containing β-cyclodextrin

摘要

Polyester copolymers were prepared with β-cyclodextrin (β-CD) and sebacoyl (SCl) or terephthaloyl (TCl) chloride cross linker agents using a simple, one-pot synthesis. Variation of the mole ratios (i.e., 1: 1, 1: 2, 1: 3, 1: 6, and 1: 9) of β-CD to diacid chloride linker units resulted in copolymers with differing solubility and chemical stability in aqueous solution. The sorption properties of copolymers such as 1: 6 and 1: 9 SCl, and 1: 9 TCl materials were investigated because of their relative insolubility and resistance to hydrolysis at pH 4.6. The monolayer sorption capacity (Q _m) of the copolymers varied according to the nature of the cross linker and the relative mole ratio of monomers. Q_m values obtained from the Sips isotherm model range from 2.7 to 5.2 mmol/g for the sorption of p-nitrophenol at 295 K and approach the value of Q_m for a commercially available granular activated carbon sorbent.