Abstract
Graphene oxide membrane (GOM) shows great advantages in nanofiltration with the hydrophilicity and the tunable two-dimensional nanochannels. However, the instability in solution hinders the further utilization of GOM in nanofiltration. Therefore, we presented a method to improve the stability and permeability by constructing vertical channels using swift heavy ion (SHI) irradiation. In this work, the XPS, FT-IR and TEM results revealed that the SHI irradiation not only creates more shortcuts for water permeation but also stabilizes the two-dimensional nanochannels by local GO reduction. Meanwhile, the XRD results indicated the increased rejection of GOM was attributed to the reduction of GO layer spacing. Consequently, the bifunctional vertical channels were obtained to enhance the stability and nanofiltration performance, which may provide a new strategy for the preparation of GOM.
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