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Graphene-induced Tuning of the d-Spacing of Graphene Oxide Composite Nanofiltration Membranes for Frictionless Capillary Action-induced Enhancement of Water Permeability

Abstract

While dispersing graphene (Gr) in water is a formidable challenge, π–π stacking between graphene oxide (GO) and Gr is known to enable the dispersion of Gr in water. In this work, Gr-induced tuning of the d-spacing in GO composite membranes was performed by pressure-assisted self-assembly on a polysulphone inactive support. The physicochemical properties of the GO–Gr membranes were examined using numeric techniques, and the surface charges and hydrophilicities of the surfaces of GO–Gr membranes with different relative compositions of Gr were assessed. Incorporation of Gr into the GO layers was effective in inhibiting the swelling effect in the wet state; the different GO–Gr composite membranes also exhibited water permeability and salt rejection. The GO1Gr0.8 composite membrane demonstrated a water flux of 36 LMH; salt rejection values of 88.3% (sodium chloride), 91.03% (magnesium chloride), 97.6% (magnesium sulphate) and 98.26% (sodium sulphate); and the minimal free volume; hence, this sample is considered the optimal membrane. The graphene into the GO 2D laminar layer effect in the membrane performance was observed the Donnan effect convert to molecular sieve mechanism. The GO-Gr composite membranes were compared via theoretical and experimental studies.

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Publication details

The article was received on 22 Aug 2018, accepted on 14 Sep 2018 and first published on 15 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA08155G
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Graphene-induced Tuning of the d-Spacing of Graphene Oxide Composite Nanofiltration Membranes for Frictionless Capillary Action-induced Enhancement of Water Permeability

    W. Hung, T. Lin, Y. Chiao, A. Sengupta, Y. Hsiao, R. W. S , C. Hu, K. Lee and J. Lai, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA08155G

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