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Issue 5, 2019
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Technology-driven layer-by-layer assembly of a membrane for selective separation of monovalent anions and antifouling

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Abstract

Selective separation of monovalent anions with reduced fouling is one of the major challenges for anion exchange membranes (AEM) in electrodialysis (ED). In this research, an alternating current layer-by-layer (AC∼LbL) assembly technology was first proposed and then applied to the construction of a durable multilayer with the selective separation of monovalent anions with reduced fouling. Under an alternating current (AC) electric field, the hydrophilic poly(4-styrenesulfonic acid-co-maleic acid) sodium salt and 2-hydroxypropyltrimethyl ammonium chloride chitosan were homogenized and rapidly assembled on a commercial original AEM and then crosslinked using 1,4-bis(2′,3′-epoxypropyl) perfluoro-1-butane. In ED, the permselectivity and the selective separation efficiency [separation parameter between sulfate (SO42−) and chloride (Cl) ions] of the resulting membrane (AC∼LbL#7.5 AEM) were 4.87 and 62%, respectively, whereas the original AEM had corresponding parameters of 0.81 and −8%, respectively. Furthermore, the AC∼LbL#7.5 AEM still retained a permselectivity of 4.52 and a selective separation efficiency for Cl of 57% after 96 h of ED operation. In addition, the AC∼LbL#7.5 AEM showed an excellent antifouling property when three types of organic fouling materials: sodium dodecylbenzenesulfonate, bovine serum albumin and humic acid were used as model foulants.

Graphical abstract: Technology-driven layer-by-layer assembly of a membrane for selective separation of monovalent anions and antifouling

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Publication details

The article was received on 10 Nov 2018, accepted on 03 Jan 2019 and first published on 03 Jan 2019


Article type: Paper
DOI: 10.1039/C8NR09086F
Citation: Nanoscale, 2019,11, 2264-2274

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    Technology-driven layer-by-layer assembly of a membrane for selective separation of monovalent anions and antifouling

    Y. Zhao, C. Gao and B. Van der Bruggen, Nanoscale, 2019, 11, 2264
    DOI: 10.1039/C8NR09086F

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