Comprehensive Study about the Photolysis of Nitrates on Mineral Oxides

• DOI: 10.1021/acs.est.1c02182
• Publication Date: 2021-06-16T14:57:39Z
• Authors: Qingxin Ma; Cheng Zhong; Jinzhu Ma; Chunxiang Ye; Yaqi Zhao; Yuan Liu; Peng Zhang; Tianzeng Chen; Chang Liu; Biwu Chu; Hong He
• Keywords: Photodegradation; Nitrogen oxides

Nitrates formed on mineral dust through heterogeneous reactions in high NOx areas can undergo photolysis to regenerate and potentially interfere the photochemistry downwind low areas. However, little is known about such renoxification processes. In this study, of various nitrates different oxides was comprehensively investigated a flow reactor situ diffuse reflectance Fourier-transform infrared spectroscopy (in DRIFTS). TiO2 found much more reactive than Al2O3 SiO2 with both NO2 HONO as two major products. The yields depend cation basicity nitrate salts or acidity particles. As such, NH4NO3 productive other like Fe(NO3)3, Ca(NO3)2, KNO3. SO2 water vapor promote photodegradation by increasing surface due photoinduced formation H2SO4/sulfate H+, respectively. O2 enables photo-oxidation thus inhibits yield. Overall, our results demonstrated that be accelerated under complex air pollution conditions, which are helpful for understanding transformation nitrogen cycle atmosphere.