308nm photochemical reaction of gaseous HNO3 and benzene on α-Fe2O3 surfaces

Zhao, Jun; Zhu, Chengzhu; Zou, Jiaji; Peng, Shuchuan; Chen, Tianhu

doi:10.1016/j.jphotochem.2014.11.005

Cited by 4 publications

(2 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the present study also implies that the direct formation of NO 2 * and its interfacial reactions may be common in the UV-induced heterogeneous renoxification of HNO 3 on surfaces, even if it does not initiate from photosensitization. These processes may be involved in the high photolytic efficiency of HNO 3 on environmental surfaces. − ,− …”

Section: Atmospheric Implicationsmentioning

confidence: 99%

“…HNO 3 /NO 3 – , which is abundant and widespread in the environment, has been considered the stable sink of nitrogen oxides in the atmospheric nitrogen cycle. However, it was reported over the last decade that NO 3 – /HNO 3 could photochemically generate a significant amount of reactive nitrogen species (RNS) such as NO 2 , HONO, and NO on various atmospheric surfaces, the so-called photochemical renoxification process. − These heterogeneous photochemical renoxification processes exhibit much larger formation rate of RNS than homogeneous photolysis of HNO 3 by several times up to 3 orders of magnitude. Thus, photochemical renoxification is considered an important source of RNS that was unknown previously.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Direct Formation of Electronic Excited NO₂ Contributes to the High Yield of HONO during Photosensitized Renoxification

Jiang

Bao

Wang

et al. 2023

Environ. Sci. Technol.

View full text Add to dashboard Cite

Photosensitized renoxification of HNO3 is found to produce HONO in an unexpectedly high yield, which has been considered an important source for atmospheric HONO. Conventionally, the production of HONO is ascribed to the secondary photolysis of the primarily formed NO2. In this study, by using humic acid (HA) as a model environmental photosensitizer, we provide evidence of the direct formation of NO2 in its electronic excited state (NO2*) as a key intermediate during the photosensitizing renoxification of HNO3. Moreover, the high HONO yield originates from the heterogeneous reaction of the primarily formed NO2* with the co-adsorbed water molecules on HA. Such a mechanism is supported by the increase of the product selectivity of HONO with relative humidity. Further luminescence measurements demonstrate clearly the occurrence of an electronic excited state (NO2*) from photolysis of adsorbed HNO3 on HA. This work deepens our understanding of the formation of atmospheric HONO and gives insight into the transformation of RNS.

show abstract