Minimising non-selective defects in ultrathin reduced graphene oxide membranes with graphene quantum dots for enhanced water and NaCl separation |
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Authors: | Shi Yuan Yang Li Ruosang Qiu Yun Xia Cordelia Selomulya Xiwang Zhang |
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Affiliation: | 1.Department of Chemical Engineering, Monash University, Clayton, Victoria 3800, Australia;2.School of Chemical Engineering, University of New South Wales, New South Wales 2052, Australia |
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Abstract: | Reduced graphene oxide (rGO) membranes have been intensively evaluated for desalination and ionic sieving applications,benefiting from their stable and well-confined interlayer channels.However,rGO membranes generally suffer from low permeability due to the high transport resistance resulting from the narrowed two-dimensional (2D) channels.Although high permeability can be realized by reducing membrane thickness,membrane selectivity normally declines because of the formation of non-selective defects,in particular pinholes.In this study,we demonstrate that the non-selective defects in ultrathin rGO membranes can be effectively minimised by a facile posttreatment via surface-deposition of graphene quantum dots (GQDs).The resultant GQDs/rGO membranes obtained a good trade-off between water permeance (14 L·m-2·h-1·MPa-1) and NaCl rejection (91%).This work provides new insights into the design of high quality ultrathin 2D laminar membranes for desalination,molecular/ionic sieving and other separation applications. |
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Keywords: | rGO membranes Graphene quantum dots Non-selective defects Water permeance NaCl rejection |
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