Electrolyte retention of supported bi-layered nanofiltration membranes

W.B. Samuel de Lint, Tijana Zivkovic, Nieck E. Benes, Henny J.M. Bouwmeester, Dave H.A. Blank

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34 Citations (Scopus)
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The electrolyte separation behaviour of a supported bi-layered ceramic membrane is investigated experimentally and the measured ion retentions are compared with the predictions of a site-binding transport model with no adjustable parameters. Due to the difference in iso-electric point between its two separating layers, the bi-layered system is expected to perform better over a large pH range compared with a membrane with only one type of selective layer. The separating layers in the membrane are a microporous silica and a mesoporous -alumina (pore sizes of 0.8 and 2 nm, respectively) and their retention is studied for a binary electrolyte solution of NaCl at 1 mol/m3 for pH values between 4 and 10. Because of its smaller pores and high charge, the silica layer mainly determines the membrane retention at neutral and alkaline pH, while the -alumina layer has a significant impact on the NaCl retention at 4 < pH< 5. The model predictions are in good agreement with the experimental data for Na+ at 4 < pH< 9 and for Cl− at the whole pH range. For a pH of 4, the predicted chloride retention is lower than the sodium retention while the experimental data show the opposite effect. © 2005 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)18-27
JournalJournal of membrane science
Issue number1-2
Publication statusPublished - 2006


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