期刊
JOURNAL OF MEMBRANE SCIENCE
卷 498, 期 -, 页码 192-200出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2015.10.001
关键词
Electrodialysis; Nanofiltration; Ion fractionation; Acid recovery; Desalination
资金
- National Natural Science Foundation of China [21490581, 21206155]
- Fundamental Research Funds for the Central Universities [WK206190049]
- Postdoctoral Science Foundation of China [BH2060000013]
A membrane process EDNF was carried out for cations fractionation, in which home-made nanofiltration membrane (NFM) was used instead of cation exchange membrane in conventional electrodialysis. Such process was exemplified by the systems of H+/Zn2+ and Na+/Mg2+. The results showed that the porous structure of NEM could decrease the transfer resistance of ions, enhance the limiting current density and thus improve the ion flux. Especially, the dense layer of NEM synthesized by interfacial polymerization could reject the divalent cations rather than monovalent cations resulting from their different Stokes radius. As a result, higher perm-selectivity and increased mono-valent ion flux were achieved simultaneously. Compared with the standard monovalent-selective CSO membrane, NEM used in EDNF can enable higher demineralization rate and acid recovery in the respective investigating systems. Thus this process is expected to apply in seawater desalination or acid recovery. (C) 2015 Elsevier B.V. All rights reserved.
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