Highly selective CO2 capture and photoreduction over porous carbon nitride foams/LDH monolith

Sunlight-driven photocatalytic CO 2 into useful carbon compounds is an ideal way to mitigate the greenhouse effect. However, this strategy is limited by poor light absorption and rapid photoexcited electron-hole recombination of traditional photocatalysts. Here, a g-C 3 N 4 (CN) foam/LDH heterojunction monolith (NCF) was fabricated by growing NiFe-LDH in situ on the porous CN foam substrate. The composite had good air permeability and light transmittance, which improves light-harvesting, CO 2 capture, and interfaces charge transfer of the NCF. The results show that the NCF catalyst has good CO 2 adsorption performance (1.52 mmol g −1 ) and enhanced CO 2 photoreduction activity (55.1 μmol g -1 h −1 ), which is ∼ 10 times higher than that of pure LDHs powder. Furthermore, the practical applicability of the NCF monolith with different thicknesses is illustrated via the CO 2 photoreduction test for the first time. This work could shed light on the development of dual-functional materials for efficient capture and photoreduction of CO 2 .