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Issue 16, 2018
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A CO2-responsive graphene oxide/polymer composite nanofiltration membrane for water purification

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Abstract

A “smart” graphene oxide (GO) based nanofiltration membrane was prepared through electrostatic and π–π interaction-driven complexation with poly(N,N-diethylaminoethyl methacrylate) bearing a pyrene end group (Py-PDEAEMA). The composite membranes show a number of attributes potentially appealing for water treatment. First, they display reversible, gas-tunable water permeability between the pore closure state under CO2 stimulation and the pore opening state upon Ar bubbling. The water permeability remains much higher than that of a pure GO membrane even at the pore closure state. Secondly, the separation of organic dye molecules from water using this membrane is similarly efficient as that using a pure GO membrane despite the much higher water permeability. Finally, as a result of CO2-induced reversal of the charge sign, the composite membrane shows an excellent trade-off between rejection of some salts like MgCl2 and water permeability, with both much higher rejection and permeability compared to a pure GO membrane. This study of a CO2-responsive, GO-based nanofiltration membrane, the first of its kind, demonstrates new perspectives in developing smart separation membranes for water purification.

Graphical abstract: A CO2-responsive graphene oxide/polymer composite nanofiltration membrane for water purification

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Publication details

The article was received on 19 Jan 2018, accepted on 19 Mar 2018 and first published on 19 Mar 2018


Article type: Communication
DOI: 10.1039/C8TA00623G
Citation: J. Mater. Chem. A, 2018,6, 6785-6791
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    A CO2-responsive graphene oxide/polymer composite nanofiltration membrane for water purification

    L. Dong, W. Fan, X. Tong, H. Zhang, M. Chen and Y. Zhao, J. Mater. Chem. A, 2018, 6, 6785
    DOI: 10.1039/C8TA00623G

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