Electrodialytic transport properties of anion-exchange membranes in the presence of ?-cyclodextrin
| Autor: | Mitsuru Higa, Toshikatsu Sata, Koji Matsusaki, Kohei Kawamura |
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| Rok vydání: | 2001 |
| Předmět: |
chemistry.chemical_classification
Polymers and Plastics Ion exchange Chemistry Sodium Inorganic chemistry Salt (chemistry) chemistry.chemical_element Electrodialysis chemistry.chemical_compound Colloid and Surface Chemistry Membrane Sodium nitrate Sodium sulfate Materials Chemistry Semipermeable membrane Physical and Theoretical Chemistry |
| Zdroj: | Colloid & Polymer Science. 279:413-419 |
| ISSN: | 1435-1536 0303-402X |
| DOI: | 10.1007/s003960000459 |
| Popis: | Electrodialysis of mixed salt solutions, sodium chloride and sodium sulfate, and sodium chloride and sodium nitrate, was carried out in the presence of x-cyclodextrin using commercial anion-exchange membranes. It was confirmed by several methods that the compound existed in the membrane matrix when the membrane had been immersed in its aqueous solution, though the molecular weight of x-cyclodextrin is relatively high. In electrodialysis, sulfate ions, large and strongly hydrated anions, easily permeated through the membranes and nitrate ions, less hydrated anions, permeated with difficulty through the membranes in the presence of α-cyclodextrin. Because x-cyclodextrin is a hydrophilic compound, which has many ether and alcoholic groups, the hydrophilicity of the anion-exchange membranes is thought to increase. Thus, sulfate ions easily permeate and nitrate ions permeate with difficulty. This proves that the hydrophilicity of the anion-exchange membranes controls permselectivity between anions through the membranes. |
| Databáze: | OpenAIRE |
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