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Issue 4, 2014
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Out-of-plane ion concentration polarization for scalable water desalination

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Abstract

We present a scalable, out-of-plane desalination approach using ion concentration polarization. A depletion boundary separates salt ions and purified water into distinct vertical layers. The out-of-plane design enables multiplexing in three dimensions, providing the functional density required for practical application. For membrane widths of 125–200 μm, and applied voltage of 5 V, the energy requirement is 4.6 Wh L−1 for 20 mM solution, and 13.8 Wh L−1 for 200 mM. Energy efficiency is found to be insensitive to flow rate as the depletion boundary adjusts to yield a commensurate volume of purified water. Scaled-up devices are presented, which have a 3-fold improvement in functional density over planar systems.

Graphical abstract: Out-of-plane ion concentration polarization for scalable water desalination

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Publication details

The article was received on 08 Nov 2013, accepted on 28 Nov 2013 and first published on 28 Nov 2013


Article type: Technical Innovation
DOI: 10.1039/C3LC51255J
Lab Chip, 2014,14, 681-685

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    Out-of-plane ion concentration polarization for scalable water desalination

    B. D. MacDonald, M. M. Gong, P. Zhang and D. Sinton, Lab Chip, 2014, 14, 681
    DOI: 10.1039/C3LC51255J

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