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Issue 20, 2011
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Preparation of porous composite ion-exchange membranes for desalination application

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Abstract

Via a two-step phase inversion technique, composite membranes with controllable porosity and a significant improvement of electrochemical properties were successfully prepared. The presence of surface functionalized mesoporous silica (SS) as inorganic fillers in the sulfonated polyethersulfone (sPES) polymer matrix was proved to have a great impact on the resultant membrane structure, which subsequently led to significantly enhanced ionic conductivity of the membranes. The correlation among inorganic fillers, composite structures, electrochemical properties and desalination performance by electrodialysis (ED) was discussed in detail. The optimal membrane was the composite with 0.2 wt% SS loading, which possessed a good ionic conductivity of 5.554 mS cm−1, a high selectivity with 0.95 transport number while maintaining good mechanical strength and thermal stability. Moreover, the performance of this membrane in ED was comparable to a commercial membrane (FKE), exhibiting a current efficiency of 0.84 and 3.82 kW h kg−1 of salt removed.

Graphical abstract: Preparation of porous composite ion-exchange membranes for desalination application

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Publication details

The article was received on 29 Nov 2010, accepted on 15 Mar 2011 and first published on 11 Apr 2011


Article type: Paper
DOI: 10.1039/C0JM04142D
Citation: J. Mater. Chem., 2011,21, 7401-7409
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    Preparation of porous composite ion-exchange membranes for desalination application

    C. Klaysom, R. Marschall, S. Moon, B. P. Ladewig, G. Q. M. Lu and L. Wang, J. Mater. Chem., 2011, 21, 7401
    DOI: 10.1039/C0JM04142D

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