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One Dimensional Building Block for Molecular Separation: Laminated Graphitic Nanoribbons

Abstract

Herein, a new carbon-based graphitic membrane composed of a laminated graphitic nanoribbon with a nanometer scale width and micrometer-scale length, the graphitic nanoribbon membrane, is reported. Compared to the existing graphitic membranes, such as those composed of graphene oxide and carbon nanotubes, the developed membrane exhibits several unique characteristics in pressure-driven systems. First, the short diffusion length through its interlayer and the free volume of its stacked nanoribbons result in high solvent flux regardless of solvent polarity (water: 25–250 L m−2 h−1 bar−1; toluene: ~975 L m−2 h−1 bar−1; hexane: ~240 L m−2 h−1 bar−1). The flux for water is one order of magnitude higher, while that for nonpolar organic solvents is two to three orders of magnitude greater than the corresponding flux values through commercially available nanofiltration membranes. Second, the membrane exhibits good separation performance, particularly with organic dye molecules (~100%) and trivalent ions (~60%), maintaining high solvent flux during extended filtration. Finally, the membrane exhibits high stability in various fluids, e.g., 1 M HCl solution, 1 M NaOH solution, toluene, ethanol, and water, as well as under hydraulic pressures of up to 50 bar. Electron microscopy observation and simulation results suggest that such distinctive membrane features are related to the entangled thin multilayers of the graphitic nanoribbons, which possibly originate from the high aspect ratio and narrow width of the nanoribbons.

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Supplementary files

Publication details

The article was received on 17 Aug 2017, accepted on 10 Nov 2017 and first published on 10 Nov 2017


Article type: Paper
DOI: 10.1039/C7NR05737G
Citation: Nanoscale, 2017, Accepted Manuscript
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    One Dimensional Building Block for Molecular Separation: Laminated Graphitic Nanoribbons

    D. W. Kim, I. Kim, J. Jang, Y. T. Nam, K. Park, K. M. Cho, K. Kwon, J. Choi, D. Kim, K. M. Kang, S. J. Kim, Y. Jung and H. Jung, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR05737G

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