Reinterpret the Heterogeneous Reaction of Α-Fe2o3 and No2 with 2d-Cos: The Role of Sds, Uv and So2

Abstract

Heterogeneous reaction of mineral aerosols and atmospheric polluting gases plays an important role in atmospheric chemistry. In this study, the reaction of NO2 with or without SO2 mixture gas on the surface of α-Fe2O3 particles under dry conditions were studied. The effects of sodium dodecyl sulfate (SDS) and the heterogeneous reaction under both dark and UV irradiation conditions were investigated. The infrared spectrum analyzed by the two-dimensional correlation spectroscopy (2D-COS) was used to obtain the products change sequences. The results showed that UV irradiation could promote the production of nitrate. With 2D-COS results, SDS changed the sequence order of nitrate and nitrite species. In oxidation conditions, the final product of heterogeneous reaction of NO2 and α-Fe2O3 was monodentate nitrate. Only the heterogenous reaction of NO2 and FOS without UV light, the final product was bidentate nitrate. SDS were the catalysis agent supply and photoresist to the system. With surface active compounds, the environmental lifetime of heterogeneous reactions between trace gases and aerosols may extend. Surfactants, ultraviolet light, and the types of gases involved in the reaction can all have complex effects on the aerosol aging process. This study provided a reference for subsequent heterogeneous reaction studies and the formation of aerosols.

Keywords: heterogeneous reaction, α-Fe2O3, 2D-COS, SDS, aerosol