Abstract:

To get a novel water-resistant membrane materail to capture the heavy metal ions in waste water, β-cyclodextrin(β-CD) and polyacrylate(PA) were blended to prepare nanofiber film with electrostatic spinning technology. The surface morphology of nanofibers was observed through scanning electron microscope(SEM) and the effect of β-CD content on the surface morphology was discussed. Meanwhile, the capturing performance of nanofibers for heavy metal ions was studied and the capturing mechnism was analysed initially by SEM of nanofibers before and after capturing. The results showed that the water absorption of PA film kept 8% after 30 minutes which meant favotable water-resistance. When the concentration of PA was 10%, the bonding between monofilaments in nanofibrous film improved greatly with β-CD content increasing. When the concentration of PA and β-CD were 10% and 50%, the capturing amount of nanofibrous film for copper or ferrum ions was 82.0 or 219.5mg/g respectively. There were obvious copper ions gathering on the surface of nanofibrous film after capturing.

Key words: electrostatic spinning, β-xyxlodextrin, polyacrylate, water resistance, copper ion, ferrum ion