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Issue 6, 2018
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An underwater superoleophobic nanofibrous cellulosic membrane for oil/water separation with high separation flux and high chemical stability

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Abstract

Oil spills and an increasing demand for the treatment of industrial oily wastewater are driving the need for continuous large-scale oil/water separation processes. Herein, we report a nanofibrous cellulosic membrane (NFC membrane) for the continuous high-flux separation of large amounts of oil/water mixtures. The NFC membrane was fabricated using wet electrospinning, a facile yet effective method for stacking nanofibrous membranes with uniform porous structures on a substrate. Owing to its cellulosic nature, the membrane showed excellent underwater superoleophobicity along with robust chemical stability and was able to separate oil/water mixtures at efficiencies exceeding 99%. Repetitive oil/water separations could be performed using a single membrane, during which the oil content in the filtrate remained extremely low (<29 ppm). The nanofibrous membrane exhibited a fine porous structure that was interconnected throughout the membrane, resulting in a high oil intrusion pressure (>30 kPa) that allowed not only gravity-driven but also pressure-driven separation of oil/water mixtures. The separation flux reached 120 000 L m−2 h−1 during pressure-driven separations, which is a very promising feature for actual applications such as the large-scale treatment of industrial oily wastewater.

Graphical abstract: An underwater superoleophobic nanofibrous cellulosic membrane for oil/water separation with high separation flux and high chemical stability

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Publication details

The article was received on 03 Nov 2017, accepted on 31 Dec 2017 and first published on 02 Jan 2018


Article type: Paper
DOI: 10.1039/C7NR08199E
Citation: Nanoscale, 2018,10, 3037-3045
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    An underwater superoleophobic nanofibrous cellulosic membrane for oil/water separation with high separation flux and high chemical stability

    S. K. Hong, S. Bae, H. Jeon, M. Kim, S. J. Cho and G. Lim, Nanoscale, 2018, 10, 3037
    DOI: 10.1039/C7NR08199E

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