Facile alkali-assisted synthesis of g-C 3 N 4 materials and their high-performance catalytic application in solvent-free cycloaddition of CO 2 to epoxides

g-C 3 N 4 materials have been prepared at lower temperatures (450–475 °C) by the aid of alkali treatment. In cycloaddition of CO 2 to epoxides, the g-C 3 N 4 materials demonstrated high and stable catalytic activities.