Fabrication of ZnO NP/g-C3N4 column brace structure composites and study on NO photocatalytic oxidation removal performance

In this study, we proposed a strategy for constructing column-bred composite materials with in-situ growth of nano-zinc oxide lattice on the surface of graphitic carbon nitride (g-C3N4) to achieve photooxidative removal of NO under visible light. ZnO NP/g-C3N4 composite photooxidants with different zinc oxide particle loads were successfully prepared by ion adsorption reaction, and their structural and electronic properties were studied. The results showed that the introduction of ZnO NP improved the agglomeration of g-C3N4, increased the specific surface area, and exposed more active sites. The construction of heterostructures improves the band structure of the composites, promotes the migration and separation of photogenerated carriers, and significantly improves the photooxidation performance. The 2.5% ZnO NP/g-C3N4 sample showed excellent photooxidation performance under visible light irradiation, and showed excellent efficiency and stability for the photooxidation removal of NO at concentrations below 300 ppm. This study provides an effective strategy for the design and construction of high-performance photooxidants, and provides a technical reference for the elimination of industrial NO pollutants.