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a Single gas permeation of the one-μm-thick g-C3N4 membrane at home temperature and 1?�bar. The inset reveals the gas selectivity for H2 about other gases. b Permeance and separation aspects of the one-μm-thick g-C3N4 membranes while in the equimolar mixed-gas permeation at area temperature and 1?�bar. Inset exhibits the kinetic diameters of