A CO2 separation membrane can include a CO2-philic layer comprising one or more mobile CO2 carriers and one or more immobile CO2 carriers and a blended CO2-permeable and CO2-selective matrix that hosts the immobile or mobile CO2 carriers and porous nanostructures that adsorb water vapors. The CO2-philic layer can be disposed upstream of the CO2-permeance layer such that a flow of source gas to be separate enters the membrane from a feed side at which the CO2-philic layer is present and CO2 exits the membrane at a permeate side after passing through both the CO2-philic layer and the CO2-permeance layer.