Transport of a zwitter ion across a composite ion-exchange membrane involving the dual sorption mechanism
| Autor: | G.A. Denisov, M. Bleha, L. K. Shataeva, V. Tyráčková, V. Šumberová, G.A. Tishchenko |
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| Rok vydání: | 1992 |
| Předmět: |
chemistry.chemical_classification
Ion exchange Filtration and Separation Sorption Biochemistry chemistry.chemical_compound Membrane Adsorption chemistry Chemical engineering Zwitterion Organic chemistry General Materials Science Physical and Theoretical Chemistry Acrylonitrile Counterion Fusaric acid |
| Zdroj: | Journal of Membrane Science. 69:51-60 |
| ISSN: | 0376-7388 |
| Popis: | The equilibrium sorption and permeability of a zwitterion compound in composite membranes have been investigated. Membranes based on poly (acrylonitrile) containing a microdispersion of a cation exchange material or of a strongly basic anion exchange material are characterized in the first place by a high degree of porosity and a low ion-exchange capacity. The membrane morphology was studied by means of scanning electron microscopy. The model compound used was 5-n-butylpyridine-2-carboxylic acid [fusaric acid (FA)], which after readjustment of the medium pH acts as a counterion for both types of membranes. The shape of the recorded dependence of the equilibrium sorption on the fusaric acid concentration reflects the existence of two forms (“dissolved” and sorbed) of the compound in the membrane. In such a case transport of the compound through the membrane is adequately represented by the dual sorption model. With respect to the character of the dependence of permeability and time-lag on the fusaric acid concentration, it is obvious that the dual sorption model is only suitable in a restricted form, i.e. it should be a model using the totally immobilized sorbed form. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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