| 摘要： |
In order to explore the primary roles played by components in the polymer inclusion membrane (PIM) and their potential interactions which result in ion transport performance during electrodialysis (ED), the effect of different membrane components, i.e. base polymer, ionic liquid and plasticizer have been systematically investigated. Results showed that the roughest and least hydrophilic poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) based PIMs exhibited the best transport efficiency at the same current den-sity (7 mA cm(-2) ) compared to cellulose triacetate (CTA) and poly (vinyl chloride) (PVC) based membranes. The addition of ionic liquids decreased the crystallinity of CTA based PIMs, but increased the crystallinity of PVDF-HFP based PIMs through forming hydrogen bonds and thus supported the fixed-site jumping mechanism. Additionally, the membrane area resistance of PVDF-HFP based PIMs was the lowest (28.4 and 5.4 Omega cm(-2) for Cyphos IL 101 and Aliquat 336, respectively). Furthermore, a proper amount of plasticizer can improve the transport efficiency of Cr(VI), which the stripping degree and permeability reached 95.9% and 35.8 mu m s(-1) at a stack voltage of only 2.6 V. The prepared PIM also exhibited good stability during 10 cycles running in ED. This study provides prospects and guidance to enhance the PIM properties for valuable ion recovery from various streams. |
