Application Research of Metal-Organic Frameworks in the Treatment of NO2 and SO2

Abstract

With the acceleration of industrialization, emissions of nitrogen oxides (NO₂) and sulfur oxides (SO₂) have been increasing significantly, becoming major sources of global atmospheric pollution. Traditional treatment methods suffer from high energy consumption, high costs, and secondary pollution, driving the research and application of new materials. Adsorption materials offer advantages such as high selectivity, environmental friendliness, and renewability. Compared to traditional adsorption materials such as zeolites and activated carbon, metal-organic frameworks (MOFs) exhibit tunable pore structures, a high specific surface area, and ease of functionalization, demonstrating significant potential in the adsorption treatment of NO₂ and SO₂. This paper focuses on the application of MOFs in end-of-pipe pollution control, systematically analyzing the key factors influencing their adsorption performance, including pore size, specific surface area, functional group types, adsorption mechanisms (such as physical adsorption, chemical adsorption, and synergistic mechanisms), and environmental factors (temperature and humidity). The study found that the matching of pore size with gas molecule diameter and the chemical properties of functional groups, in conjunction with adsorption mechanisms, jointly determine the adsorption efficiency, reversibility, and stability of MOFs. Finally, directions for future improvements of MOFs are proposed.