Here, a facile strategy is reported to prepare thin freestanding graphene oxide (GO) laminar membranes through thermally-induced chemical cross-linking process. The resultant freestanding cross-linked GO (F-CGO) membranes show controllable inter-laminar distance and hydraulic stability in aqueous media. Semi-permeability tests through a forward osmosis (FO) system show that the water permeation rate of the F-CGO membranes is up to 35.5 L m−2 h−1 when the draw solution is 2.0 mol L−1 NaCl solution. This value is much higher than that of standing cross-linked GO (S-CGO) membranes, which indicates that the internal concentration polarization (ICP) effect has been alleviated by the F-CGO membrane. Furthermore, clean-water was taken in from various wastewaters, but without any detectable residual pollutants by using the F-CGO membrane as a separator. This work demonstrates that the F-CGO membrane is promising for water purification applications through the FO process, especially for portable water purification systems utilized during emergency situations.
CITATION STYLE
Yan, F., Yu, C., Zhang, B., Zou, T., Zhao, H., & Li, J. (2017). Preparation of freestanding graphene-based laminar membrane for clean-water intake via forward osmosis process. RSC Advances, 7(3), 1326–1335. https://doi.org/10.1039/c6ra27141c
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