Permselectivity of Cation Exchange Membranes Modified by Polyaniline
| Autor: | Nazar Romanyuk, I. V. Falina, N. V. Loza, S. A. Loza, Ekaterina Titskaya |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
cation exchange membrane
Diffusion Inorganic chemistry Filtration and Separation 02 engineering and technology Conductivity 010402 general chemistry lcsh:Chemical technology 01 natural sciences Article polyaniline Divalent Ion chemistry.chemical_compound Mass transfer Polyaniline Chemical Engineering (miscellaneous) characterization lcsh:TP1-1185 electrodialysis lcsh:Chemical engineering permselectivity chemistry.chemical_classification Process Chemistry and Technology lcsh:TP155-156 Electrodialysis 021001 nanoscience & nanotechnology 0104 chemical sciences Membrane chemistry 0210 nano-technology |
| Zdroj: | Membranes, Vol 11, Iss 227, p 227 (2021) Membranes Volume 11 Issue 3 |
| ISSN: | 2077-0375 |
| Popis: | This work discusses the applicability of polyaniline-modified cation exchange membranes for the separation of monovalent/divalent cations by electrodialysis. A novel method of membrane modification directly in the electrodialysis unit is used to prepare permselective membranes. Complex characterization of the membranes before and after modification allows revealing the influence of membrane matrix on the modification efficiency. The characterization of the membranes includes determination of the diffusion permeability, specific conductivity and current–voltage curves in HCl, NaCl and CaCl2 solutions, as well as transport-structural parameters of the extended three-wire model. The characterization results are used to predict the influence of the modification on membrane permselectivity. The competitive mass transfer of singly and doubly charged cations in the electrodialysis process is investigated in underlimiting and overlimiting currents. Electrodialysis desalination of a solution containing Na+/Ca2+ or H+/Ca2+ cations shows that the modification leads to an increase in membrane permselectivity to single-charged cations due to the repulsion of Ca2+ ions from the positively charged membrane surface. The permselectivity of the polyaniline-modified perfluorinated membrane to H+ in the mixture of H+/Ca2+ cations is observed in all current regimes. |
| Databáze: | OpenAIRE |
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