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Graphene oxide (GO), as an ultrathin, high-flux, and energy-efficient separation membrane, has shown great potential for CO₂ capture. In this study, using molecular dynamics simulations, the separation of CO₂ and N₂ through the interlayer gallery of GO membranes was studied. The preferential adsorption of CO₂ in the GO channel derived from their strong interaction is responsible for the selectivity of CO₂ over N₂. Furthermore, the influences of interlayer spacing, oxidization degree, and channel length on the separation of CO₂/N₂ were investigated. Our studies unveil the underlying mechanism of CO₂/N₂ separation in the interlayer GO channel, and the results may be helpful in guiding rational design of GO membranes for gas separation.