Photoreduction of Nitrate to HONO and NOx by Organic Matter in the Presence of Iron and Aluminum DOI

Elizabeth Melssen,

D. L. Bish,

Yaroslav Losovyj

et al.

ACS Earth and Space Chemistry, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 15, 2024

Nitrogen oxides (NOy) such as NO, NO2, and HONO control the oxidative capacity of lower atmosphere. Studies have shown that photolysis nitrate on atmospheric surfaces is an efficient source nitrogen through a process termed "renoxification;" however, mechanisms responsible for this remain poorly understood, leading to difficulties in modeling composition. This work aims elucidate mechanism NOy formation from model boundary layer comprised mixtures organic matter (citrate Suwanee River fulvic acid) environmentally relevant metals (e.g., Al3+ Fe3+). Results show presence matter, photochemical yields were enhanced by factor between 5 15 compared with pure controls. Known photochemistry are unable explain enhancement, suggesting fraction directly converted strong reductants produced photochemically matter. The addition Fe (hydr)oxides catalyzed both reduction NO2 further NO via Fe2+, which formed photoreduction Fe-organic coordination complexes. In addition, study assesses contribution surface acidity visible light attenuation product yields. results support growing body evidence generated important unrecognized pathway renoxification soil airborne mineral dust aerosols).

Language: Английский

Breaking down microdroplet chemistry DOI
R. Graham Cooks, Dylan T. Holden

Science, Journal Year: 2024, Volume and Issue: 384(6699), P. 958 - 959

Published: May 30, 2024

Charged microdroplets accelerate mineral disintegration.

Language: Английский

Citations

5
Complexities of Photosensitization in Atmospheric Particles DOI Creative Commons
Zhancong Liang, Yongjie Li,

Brix Raphael Go

et al.

ACS ES&T Air, Journal Year: 2024, Volume and Issue: 1(11), P. 1333 - 1351

Published: Oct. 10, 2024

Brown carbons (BrCs) play a pivotal role in the light absorption by aerosol particulates exerting positive radiative forcing effect that contributes to global warming. Beyond impacts on balance, some BrCs, as photosensitizers, can generate reactive triplet-state molecules toward various atmospheric upon photoexcitation. The significance of photosensitization has been increasingly recognized, particularly context escalated wildfire incidents emit substantial BrCs. We focus complex discussing current challenges, including (1) diverse reactivities photosensitizer mixture particles, (2) methodologies for investigating processes, (3) driving factors photosensitization, and (4) typical pathways mechanisms photosensitized reactions. Lastly, we advise future research refined parametrization triplet singlet oxygen concentrations, alongside their reactivities.

Language: Английский

Citations

2
Photoreduction of Nitrate to HONO and NOx by Organic Matter in the Presence of Iron and Aluminum DOI

Elizabeth Melssen,

D. L. Bish,

Yaroslav Losovyj

et al.

ACS Earth and Space Chemistry, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 15, 2024

Nitrogen oxides (NOy) such as NO, NO2, and HONO control the oxidative capacity of lower atmosphere. Studies have shown that photolysis nitrate on atmospheric surfaces is an efficient source nitrogen through a process termed "renoxification;" however, mechanisms responsible for this remain poorly understood, leading to difficulties in modeling composition. This work aims elucidate mechanism NOy formation from model boundary layer comprised mixtures organic matter (citrate Suwanee River fulvic acid) environmentally relevant metals (e.g., Al3+ Fe3+). Results show presence matter, photochemical yields were enhanced by factor between 5 15 compared with pure controls. Known photochemistry are unable explain enhancement, suggesting fraction directly converted strong reductants produced photochemically matter. The addition Fe (hydr)oxides catalyzed both reduction NO2 further NO via Fe2+, which formed photoreduction Fe-organic coordination complexes. In addition, study assesses contribution surface acidity visible light attenuation product yields. results support growing body evidence generated important unrecognized pathway renoxification soil airborne mineral dust aerosols).

Language: Английский

Citations

1