ACS Nano
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2D Heterostructured Nanofluidic Channels for Enhanced Desalination Performance of Graphene Oxide Membranes.

Publication Date Apr 6, 2021

Abstract

The two-dimensional (2D) lamellar membrane assembly technique shows substantial potential for sustainable desalination applications. However, the relatively wide and size-variable channels of 2D membranes in aqueous solution result in inferior salt rejections. Here we show the establishment of nanofluidic heterostructured channels in graphene oxide (GO) membranes by adding g-C3N4 sheets into GO interlamination. Benefiting from the presence of stable and sub-nanometer wide (0.42 nm) GO/g-C3N4 channels, the GO/g-C3N4 membrane exhibits salt rejections of ∼90% with water permeances of above 30 L h-1 m-2 bar-1, while the pure GO membrane only has salt rejections of below 30% accompanied by water permeances of below 4 L h-1 m-2 bar-1. Combining experimental and theoretical investigations, size exclusion has proved to be the dominating mechanism for high rejections, and the ultralow friction water flow along g-C3N4 sheets is responsible for permeation enhancements. Importantly, the GO/g-C3N4 membrane shows promising long-term, antioxidation, and antipressure stability.

Concepts
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Pure Graphene Oxide Membrane
Graphene Oxide
Permeances
Graphene Oxide Membranes
Pure Graphene Oxide
Desalination
g-C3N4 Sheets
Nanofluidic Channels
Size Exclusion
Graphene

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