| Dielectric analysis of low-frequency relaxation for the systems of nanofiltration membrane/solution—electrical properties and ion permeability of each layer inside membrane |
| Authors: NI Guizhi1, ZHAO Kongshuang1 |
| Units: College of Chemistry, Beijing Normal University |
| KeyWords: nanofiltration membrane; dielectric relaxation; interfacial polarization; ion permeability |
| ClassificationCode:TQ028.8 0441.6 |
| year,volume(issue):pagination: 2011, 31(1):12-20 |
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Abstract: |
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Dielectric measurements were carried out on the systems composed of nanofiltration membrane and dilute solutions of eight electrolytes over the frequency range from 40Hz to 10MHz. Two relaxations were observed for each system. Three-phase dielectric model, which consist of the supporting layer and separation layer of membrane and solution phase, was established. The the electrical parameters of each layer were obtained through strict mathematical calculation. This paper focused on low-frequency relaxation about 103Hz caused by interfacial polarization between the two layers. The variation of electrical parameters of the two layers with concentration and species of the electrolyte was discussed in detail. Further, dielectric properties of each layer were obtained and the distribution information of different electrolyte in supporting layer and separation layer of membrane were given. |
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Funds: |
| 国家自然科学基金基金资助项目(20976015) |
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AuthorIntro: |
| 倪贵智(1985-),女,河北衡水人,硕士研究生 现从事纳滤膜介电研究 通讯联系人:赵孔双,Email: zhaoks@bnu.edu.cn niguizhi2003@sina.com 联系人的电话是58808283 |
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Reference: |
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[1] Mohammad A W, Hilal N, Al-Zoubi H, et al. Modelling the effects of nano- filtration membrane properties on system cost assessment for desalination applications[J]. Desalination, 2007, 206: 215–225. |
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