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Article Abstract
Nitrate photolysis is a vital process in secondary NOx release into the atmosphere. The heterogeneous oxidation of SO due to nitrate photolysis has been widely reported, while the influence of SO on nitrate photolysis has rarely been investigated. In this study, the photolysis of nitrate on different substrates was investigated in the absence and presence of SO. In the photolysis of NHNO on the membrane without mineral oxides, NO, NO, HONO, and NH decreased by 17.1, 6.0, 12.6, and 57.1% due to the presence of SO, respectively. In the photolysis of NHNO on the surface of mineral oxides, SO also exhibited an inhibitory effect on the production of NOx, HONO, and NH due to its reducibility and acidic products, while the increase in surface acidity due to the accumulation of abundant sulfate on TiO and MgO promoted the release of HONO. On the photoactive oxide TiO, HSO, generated by the uptake of SO, could compete for holes with nitrate to block nitrate photolysis. This study highlights the interaction between the heterogeneous oxidation of SO and nitrate photolysis and provides a new perspective on how SO affects the photolysis of nitrate absorbed on the photoactive oxides.
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