one gas permeation with the one-?m-thick g-C3N4 membrane at space temperature and 1??bar. The inset displays the gasoline selectivity for H2 around other gases. b Permeance and separation factors with the 1-?m-thick g-C3N4 membranes during the equimolar combined-gasoline permeation at room temperature and one??bar. Inset exhibits the kinetic diamet