Abstract
ABSTRACTLayered graphene oxide (GO) membranes are considered promising separation membranes because of their lamellar structure, strong mechanical strength and strong hydrophilic properties. However, there are a limited number of studies on the mechanism of water transport through a layered GO membrane. In this paper, by using a self-synthesized layered GO membrane, we developed and validated the first dynamic equation to describe water transport through a layered GO membrane. The results showed that the relationship between membrane flux and GO loading is an exponential function and that the water flux decreases with increasing GO loading. Then, the dynamic equation was applied to previously reported layered GO membranes to further verify its applicability. This kinetic study on layered GO membranes provides insight into the development of high-performance membranes with high permeability and selectivity.
Highlights
Graphene oxide (GO), a two-dimensional carbon material, has received an extensive amount of attention for its potential application in membranes owing to its numerous hydrophilic groups, exceptional mechanical strength, and superior structural and thermal properties [1,2,3,4,5,6,7,8,9,10,11,12,13]
We have found that layered GO membranes have great potential for use in filtration and separation due to their unimpeded water permeation and excellent separation performance [18,19,20]
The main research on the kinetic mechanism of water transport in layered GO membranes is as follows: Huang et al [23] have fabricated ultrathin graphene nanofiltration membranes by filtering an extremely dilute solution of base-refluxed reduced GO through a microporous substrate. They regarded the flow of water through the graphene oxide membrane as being a classical viscous flow and used the modified Hagen-Poiseuille equation to describe the flow of water in the graphene oxide membrane
Summary
Graphene oxide (GO), a two-dimensional carbon material, has received an extensive amount of attention for its potential application in membranes owing to its numerous hydrophilic groups, exceptional mechanical strength, and superior structural and thermal properties [1,2,3,4,5,6,7,8,9,10,11,12,13]. The main research on the kinetic mechanism of water transport in layered GO membranes is as follows: Huang et al [23] have fabricated ultrathin graphene nanofiltration membranes (uGNMs) by filtering an extremely dilute solution of base-refluxed reduced GO (brGO) through a microporous substrate. They regarded the flow of water through the graphene oxide membrane as being a classical viscous flow and used the modified Hagen-Poiseuille equation to describe the flow of water in the graphene oxide membrane. This work provides a theoretical foundation for the application of graphene oxide membranes in water treatment
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