Recent progress of microstructure-regulated g-C3N4 in photocatalytic NO conversion: The pivotal roles of adsorption/activation sites

Photocatalytic nitric oxide (NO) conversion technology has the characteristics of high efficiency, economy, and environment friendly to remove NO using g-C 3 N 4 . Introducing new adsorption sites on the surface of g-C 3 N 4 through microstructure control can alter the structure-activity relationship between g-C 3 N 4 and gas molecules, thereby improving photocatalytic NO conversion activity and inhibiting NO 2 generation. However, few review articles have focused on the microscopic effects of microstructural changes in g-C 3 N 4 based materials on the adsorption and activation of NO and O 2 . This has important guiding significance for material design work in the field of NO conversion and strategies to fundamentally improve NO conversion activity and selectivity. Therefore, our work systematically summarizes the strategy of introducing adsorption and activation sites through microstructure control, and emphasizes the role of these sites in the photocatalytic NO conversion process. The aim is to clarify the influence of adsorption and activation sites on adsorption behavior and the correlation between these sites and reaction paths. Finally, the development trend and future prospects of increasing the level of g-C 3 N 4 adsorption and activation in the field of photocatalytic NO conversion are introduced, which is expected to provide an important reference for the development and practical application of g-C 3 N 4 -based photocatalytic materials. Through microstructure regulation, new adsorption/activation sites can be introduced in g-C 3 N 4 . These sites regulate the adsorption mode, reaction pathway, intermediate species, and final product by altering the adsorption energy and activation energy, thereby achieving efficient conversion of NO and inhibiting the production of toxic NO 2 .