ZIF‐67‐Derived 3D Hollow Mesoporous Crystalline Co3O4 Wrapped by 2D g‐C3N4 Nanosheets for Photocatalytic Removal of Nitric Oxide

Abstract ZIF‐67‐derived 3D hollow mesoporous crystalline Co 3 O 4 wrapped by 2D graphitic carbon nitride (g‐C 3 N 4 ) nanosheets are prepared by low temperature annealing, and are used for the photocatalytic oxidation of nitric oxide (NO) at a concentration of 600 ppb. The p–n heterojunction between Co 3 O 4 and g‐C 3 N 4 forms a spatial conductive network frame and results in a broad visible light response range. The hollow mesoporous structure of Co 3 O 4 contributes to the circulation and adsorption of NO, and the large specific surface area exposes abundant active sites for the reaction of active species. A maximum NO degradation efficiency of 57% is achieved by adjusting the mass of the Co 3 O 4 precursor. Cycling tests and X‐ray diffraction indicate the high stability and recyclability of the composite, making it promising in environmental purification applications.