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Issue 22, 2010
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Chlorine tolerant, multilayer reverse-osmosis membranes with high permeate flux and high salt rejection

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Abstract

A new class of high molecular weight polyethersulfone ionomers is described in which the ionic content can be varied, at will, over a very wide and fully controllable range. A novel type of coating process enables these materials to be deposited from alcohol-type solvents as cohesive but very thin (50–250 nm) films on porous support membranes, giving high-flux membranes (3.3–5.0 L m−2 h−1 bar−1) with very good, though not outstanding, salt rejection (typically 92–96%). A secondary layer of formaldehyde–cross-linked polyvinyl alcohol can be deposited from aqueous solution on the surface of the ionomer membrane, and this layer increases salt rejection to greater than 99% without serious loss of water permeability. The final multilayer membrane shows excellent chlorine tolerance in reverse-osmosis operation.

Graphical abstract: Chlorine tolerant, multilayer reverse-osmosis membranes with high permeate flux and high salt rejection

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Publication details

The article was received on 15 Dec 2009, accepted on 16 Feb 2010, published on 15 Mar 2010 and first published online on 15 Mar 2010


Article type: Paper
DOI: 10.1039/B926352G
Citation: J. Mater. Chem., 2010,20, 4629-4634
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    Chlorine tolerant, multilayer reverse-osmosis membranes with high permeate flux and high salt rejection

    H. M. Colquhoun, D. Chappell, A. L. Lewis, D. F. Lewis, G. T. Finlan and P. J. Williams, J. Mater. Chem., 2010, 20, 4629
    DOI: 10.1039/B926352G

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