Abstract: Polyvinyl alcohol (PVA) and glutaraldehyde were used as the materials to prepare PVA nanofiber membrane by electro-spinning technique. Under acidic condition, the membrane was crosslinked into water-stable nanofibrous mats, then in alkaline condition, the epoxy chloropropane reacted with the membrane and the epoxypropyl was bonded to the membrane surface. Consequently, the Beta-cyclodextrin (β-CD) reacted with epoxy group modification on the surface membrane to prepare the nanofiber material with absorption selectivity and recyclability. Fourier transform infrared spectrometer and scanning electron microscopy characterization were used to demonstrate that the membrane surface had been successfully bonded with beta-cyclodextrin (β-CD) and there was no obvious change of membrane surface morphology after the bonding. In the essay, phenolphthalein was used as the probe to detect the c-PVA-β-CD-NF membrane adsorption effect of its solution and the UV spectrophotometry was used to detect the absorption efficiency of the c-PVA-β-CD-NF membrane to phenolphthalein. The experiments show that the adsorption capacity on phenolphthalein of the c-PVA-β-CD-NF membrane was stronger than that of the PVA membrane significantly, it was at 30 min that the adsorption reached the state of equilibrium and the maximum adsorption capacity was 88 mg/g.

Key words: electro-spinning, polyvinyl alcohol, beta-cyclodextrin(β-CD), surface modification, phenlphthalein, absorption