Highly Efficient NO Conversion on Layered Photocatalysts: Surface Active Site Regulation and Molecule Activation

Nitrogen oxides (NOx) in the atmosphere are significant precursors to the formation of fine particulate matter (PM_2.5) and ozone. Effectively reducing the concentration of NOx in the ambient air is crucial for the air pollution control Photocatalytic purification technology harnesses solar energy, operates under mild reaction conditions, and can convert low concentrations NO into nitrates, providing metabolic nitrogen for plant growth. From the perspectives of geochemical cycling and environmental pollution control, it is one of the most promising technologies for the purification of environmental atmospheric pollution. However, traditional catalysts face limitations in practical applications, such as low molecular activation rates, uncontrollable redox capabilities, and poor performance stability. materials. Emphasizing the critical role of active surface site control and molecular This review provides a comprehensive analysis of the advancements in photocatalytic NOx removal using ultrathin layered activation, the study explores various strategies, including defect engineering, crystal facet regulation, element doping, single-atom catalysts, and plasmon coupling, to enhance photocatalytic efficiency and selectivity. Key findings demonstrate that these advanced materials significantly improve NO adsorption, activation, and conversion, leading to higher photocatalytic performance. Despite these advancements, challenges such as the precise control of surface electronic structures, stability of active sites, scalability, and economic feasibility remain. The review highlights the need for further research to address these challenges and optimize photocatalytic technologies for large-scale applications. This work contributes to the field by offering insights into the mechanisms and potential of layered photocatalysts for sustainable and efficient air purification.