Graphene oxide (GO) membranes with unique two-dimensional (2D) nanoconfined mass transfer channels show good application prospects in water-selective transport membrane separation process . However, due to the limitation of trade off effect, it is necessary to further improve the flux and separation factor to optimize the separation efficiency. Hererin, the GO composite membrane with functional 2D interlayer confined channel is designed and prepared from the two aspects: chemical regulation of GO membrane to provide rich interlayer microenvironment and physical regulation of GO laminas to effectively use interlayer transport channels and increase membrane stability. Furthermore, the GO composite membranes were used to achieve high-efficiency pervaporation dehydration performance and explore the mass transfer mechanism in confined channel. In detail, to improve the interlayer microenvironment, the super-hydrophilic channel was constructed by introducing hydrophilic polymer to improve the water transport capacity in the membrane, and the influence of the intrinsic properties of the polymer chain on the water molecule transport was explored. Secondly, in order to further reduce the transmission resistance of water molecules in the 2D channel, the 2D porous membrane was constructed to provide more nanofluidic channels to improve the transmission efficiency of water molecules. It is worth noting that the stability of GO membrane still has some challenges. Therefore, by building a 2D channel with both hydrophilicity and stability, it can not only improve the chemical hydrophilic microenvironment, but also increase the sub-nanometer confined mass transfer space and ensure the membrane stability, thereby promoting the ultrafast transport of water molecules. This work will provide a new insignt to construct 2D channels for the high-efficiency water-selective transport.

Design and construction of two-dimensional graphene oxide membranes for ultrafast water-selective transport

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