Thin-Film Mixed-Matrix Membranes for CO<sub>2</sub> Separation with Poly(ethylene glycol)-grafted Graphene Oxide
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초록
내용
The incorporation of two-dimensional (2D) nanofillers into thin-film (1 m thickness) mixed-matrix membranes (MMMs) remains difficult due to interfacial difficulties that cause Knudsen diffusion and a loss of selectivity. We report a surface modification technique that uses an epoxy group ring opening procedure and free-radical polymerization on the graphene oxide (GO) surface to enable the grafting of CO2-philic poly(ethylene glycol) (PEG) chains. The addition of functional groups to PEG modify GO enhances the interlayer gap between the 2D GO layers. The extensive PEG domain between the layers, in particular, provides an effective CO2-philic route and reduces the formation of polymer matrix-GO filler interfacial defects, resulting in high CO2 permeance and selectivity.