Minimising non-selective defects in ultrathin reduced graphene oxide membranes with graphene quantum dots for enhanced water and NaCl separation

Shi Yuan; Yang Li; Ruosang Qiu; Yun Xia; Cordelia Selomulya; Xiwang Zhang

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Minimising non-selective defects in ultrathin reduced graphene oxide membranes with graphene quantum dots for enhanced water and NaCl separation

Separation Science and Engineering | Updated：2026-01-06

- Minimising non-selective defects in ultrathin reduced graphene oxide membranes with graphene quantum dots for enhanced water and NaCl separation
- Chinese Journal of Chemical Engineering Vol. 41, Issue 1, Pages: 278-285(2022)
- Affiliations：
  
  1. Department of Chemical Engineering, Monash University, Clayton,Victoria,Australia,3800
  2. School of Chemical Engineering, University of New South Wales, New South Wales,Australia,2052
- Author bio：
- Funds：
- DOI：
  CLC：
- Published：2022
- Accepted：
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Shi Yuan, Yang Li, Ruosang Qiu, Yun Xia, Cordelia Selomulya, Xiwang Zhang. Minimising non-selective defects in ultrathin reduced graphene oxide membranes with graphene quantum dots for enhanced water and NaCl separation[J]. Chinese Journal of Chemical Engineering, 2022, 41(1): 278-285.
DOI：

Shi Yuan, Yang Li, Ruosang Qiu, Yun Xia, Cordelia Selomulya, Xiwang Zhang. Minimising non-selective defects in ultrathin reduced graphene oxide membranes with graphene quantum dots for enhanced water and NaCl separation[J]. Chinese Journal of Chemical Engineering, 2022, 41(1): 278-285. DOI：

摘要

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 nonselective 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

surfacedeposition 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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