Ion exchange membranes with high permselectivity (the character of separating cations from anions or anions from cations) and high selectivity (the character of separating cations or anions of different valencies) are important for electrodialysis process. The Donnan equilibrium theory, based on the equilibrium of ions and no electric field, can not exactly explain the permselectivity of ion exchange membrane for ED process, since it is impossible to set up a ion exchange equilibrium between membrane and solution and to neglect the influence of electrical driving force on ions during ED process. A novel model named "anti-electric potential " is established to interpret the permselectivity of ion exchange membrane, according to the determination of electric potential between membranes and the variation of elements content in solutions and membranes. The results of experiment prove that the "anti-electric potential" really exists within membranes. As for the selectivity, the results reveal that electric potential and hydration energy have great influence on the concentration and mobility of ions in membranes.
参考文献
| [1] | Ramon V P;Jose A I M .Current-voltage curves for an electrodialysis reversal pilot plant:determination of limiting currents[J].Desalination,2001,141(04):23. |
| [2] | Shaposhnik VA.;Kesore K. .AN EARLY HISTORY OF ELECTRODIALYSIS WITH PERMSELECTIVE MEMBRANES[J].Journal of Membrane Science,1997(1/2):35-39. |
| [3] | Bazinet L;Lamarche F;Ippersiel D.Ionic balance: a closer look at K+ migrated and H+ generated during bipolar membrane electro-acidification of soybean proteins[J].Trends in Food Science and Technology,1998(09):107. |
| [4] | Alheritiere C;Ernst W R;Davis T A .Metathesis of magnesium and sodium salt systems by electrodialysis[J].Desalination,1998,115(06):190. |
| [5] | Shaposhnik VA.;Kesore K. .AN EARLY HISTORY OF ELECTRODIALYSIS WITH PERMSELECTIVE MEMBRANES[J].Journal of Membrane Science,1997(1/2):35-39. |
| [6] | Bazinet L.;Lamarche F.;Ippersiel D. .Bipolar-membrane electrodialysis: Applications of electrodialysis in thefood industry[J].Trends in food science & technology,1998(3):107-113. |
| [7] | Zhang W R.Electrodialysis Engineering (in Chinese)[M].北京:科学出版社,1995:28-31. |
| [8] | Vallejo M E;Persin F;Innocent C .Electrotransport of Cr(Ⅵ) through an anion exchange membrane[J].Separation and Purification Technology,2000,21(01):63. |
| [9] | Vallejo E;Pourcelly G;Gavach C;Mercier R .Sulfonated polyimides as proton conductor exchange membranes[J].Journal of Membrane Science,1999,160(03):130. |
| [10] | Sata T;Kawamura K;Matsusaki K .Electrodialytic transport properties of anion-exchange membranes prepared from poly(vinyl alcohol),poly(N-ethyl 4-vinylpyridinium salt) and (-cyclo-dextrin[J].Journal of Membrane Science,2001,181(04):170. |
| [11] | Rodrigues M A S;Dalla R F;Bernardes A M .Influnce of ligand exchange on the treatment of trivalent chromium solutions by electrodialysis[J].Electrochimica Acta,2001,47(01):753. |
| [12] | Bazinet L.;Lamarche F.;Ippersiel D. .Bipolar-membrane electrodialysis: Applications of electrodialysis in thefood industry[J].Trends in food science & technology,1998(3):107-113. |
| [13] | Toshikatsu S .Studies on anion exchange membranes having permselectivity for specific anions in electrodialysis-effect of hydrophilicity of anion exchange membranes on permselectivity of anions[J].Journal of Membrane Science,2000,167(02):1-2. |
| [14] | Jin·X;Xiang C L;Qi D Z.Water Treatment Technologies and Common Date[M].北京:化学工业出版社,1997:530. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%