An anion exchange membrane modified by alternate electro-deposition layers with enhanced monovalent selectivity
| Autor: | Tang Kaini, Jiangnan Shen, Yan Zhao, B. Van der Bruggen, Huimin Liu, Congjie Gao, Arcadio Sotto Díaz |
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| Rok vydání: | 2016 |
| Předmět: |
Ion exchange
Inorganic chemistry Filtration and Separation 02 engineering and technology Electrodialysis 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Biochemistry eye diseases 0104 chemical sciences Polystyrene sulfonate chemistry.chemical_compound Membrane Sulfonate chemistry General Materials Science Physical and Theoretical Chemistry 0210 nano-technology Selectivity Polarization (electrochemistry) |
| Zdroj: | Journal of Membrane Science. 520:262-271 |
| ISSN: | 0376-7388 |
| DOI: | 10.1016/j.memsci.2016.07.026 |
| Popis: | A novel anion exchange membrane (AEM) is developed through poly (sodium 4-styrene sulfonate) (PSS) and hydroxypropyltrimethyl ammonium chloride chitosan (HACC) alternate electro-deposition to enhance the monovalent selectivity. Compared to the commercial original AEM, coating of the (PSS/HACC)N alternate electro-deposition multilayer on the membrane surface dramatically enhance the selectivity of anions. In addition, the permselectivity for monovalent anions of the membranes was investigated by electrodialysis experiments. For comparison, the corresponding Cl−/SO42− were chosen and the average values of permselectivity and separation efficiency of commercial AEM are 0.66 and −0.19 respectively. As result of alternate electro-deposition of PSS/HACC layers, the permselectivity raised up to 2.90 and the separation efficiency also increased up to 0.28 for nine PSS/HACC bilayers needed. Under the optimal fabricating conditions, the area resistance of membrane arrived at 4.52 Ω cm2 with nine PSS/HACC bilayers. Meanwhile, the polarization current-voltage curves and ζ-potential of membranes were also tested to characterize the electrochemical behavior of the modified membrane. The high selectivities of these membranes may enable electrodialysis applications in separation of monovalent and divalent anions. |
| Databáze: | OpenAIRE |
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