Pressure Controlled Polymer Cross-linked Structure in Graphene Oxide Membrane for Selective Ion Separation
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Assembling graphene oxide (GO) layers into a layer-stacked structure with nano-scale channels has turned out an effective way for promising applications, including ion exchange membranes and desalination. As modification of GO layers can be carried out by various chemical reactions in bulk solution before the formation of membrane structures, the physicochemical and electrostatic properties of the nanoscale pathway are greatly changed, leading to a different ion and water transport behavior in nanochannel. In this work, we prepared a GO membrane having a polymer cross-linked structure composed of hyper-branched polyethylenimine (HPEI) and polyacrylic acid (PAA) in nanochannels. We found that the channel size of composite membranes is controlled depending on the applied pressure during the amide bond formation between HPEI and PAA, while at the same time improving charge properties of nanochannels due to inserted polyelectrolytes, resulting in a high ion separation performance.