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http://dx.doi.org/10.14579/MEMBRANE_JOURNAL.2018.28.1.75

Development of Graphene Nanocomposite Membrane Using Layer-by-layer Technique for Desalination  

Yu, Hye-Weon (School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST))
Song, Jun-Ho (School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST))
Kim, Chang-Min (School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST))
Yang, Euntae (School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST))
Kim, In S. (School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST))
Publication Information
Membrane Journal / v.28, no.1, 2018 , pp. 75-82 More about this Journal
Abstract
Forward osmosis (FO) desalination system has been highlighted to improve the energy efficiency and drive down the carbon footprint of current reverse osmosis (RO) desalination technology. To improve the trade-off between water flux and salt rejection of thin film composite (TFC) desalination membrane, thin film nanocomposite membranes (TFN), in which nanomaterials as a filler are embeded within a polymeric matrix, are being explored to tailor the separation performance and add new functionality to membranes for water purification applications. The objective of this article is to develop a graphene nanocomposite membrane with high performance of water selective permeability (high water flux, high salt rejection, and low reverse solute diffusion) as a next-generation FO desalination membrane. For advances in fabrication of graphene oxide (GO) membranes, layer-by-layer (LBL) technique was used to control the desirable structure, alignment, and chemical functionality that can lead to ultrahigh-permeability membranes due to highly selective transport of water molecules. In this study, the GO nanocomposite membrane fabricated by LBL dip coating method showed high water flux ($J_w/{\Delta}{\pi}=2.51LMH/bar$), water selectivity ($J_w/J_s=8.3L/g$), and salt rejection (99.5%) as well as high stability in aqueous solution and under FO operation condition.
Keywords
Forward osmosis (FO); Thin film nanocomposite membrane (TFN); Graphene oxide (GO); Layer-by-layer (LBL); Dip coating;
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