Photolytic Mass Loss of Secondary Organic Aerosol Derived from Photooxidation of Biomass Burning Furan Precursors DOI Creative Commons
Nara Shin, Bin Bai, Taekyu Joo

et al.

ACS ES&T Air, Journal Year: 2025, Volume and Issue: 2(4), P. 476 - 485

Published: March 11, 2025

Direct photolysis as a potentially important chemical loss pathway for atmospheric organic aerosol (OA) is increasingly recognized but remains highly uncertain, particularly secondary (SOA) derived from biomass burning (BB) precursors. We present the measurements of photolytic mass change SOA photooxidation three furan precursors, 3-methylfuran, 2-methylfuran, and furfural, in an environmental chamber under both dry humid conditions. Each type was collected on crystal sensors, losses by 300 or 340 nm light were continuously monitored using quartz microbalance (QCM). By incorporation modeling, 10-40% masses can be lost direct solar radiation over their typical lifetime. The fraction well correlated with nitrogen-containing compounds (NOC) SOA, possibly because these species largely enhance absorption cross section readily undergo photodissociation UV light.

Language: Английский

Particulate nitrate photolysis in the atmosphere DOI Creative Commons
Masao Gen, Zhancong Liang, Ruifeng Zhang

et al.

Environmental Science Atmospheres, Journal Year: 2022, Volume and Issue: 2(2), P. 111 - 127

Published: Jan. 1, 2022

Particulate nitrate photolysis can lead to the formation of secondary inorganic and organic aerosols that affect climate, air quality, human health.

Language: Английский

Citations

127
Photochemical Reactions of Glyoxal during Particulate Ammonium Nitrate Photolysis: Brown Carbon Formation, Enhanced Glyoxal Decay, and Organic Phase Formation DOI
Ruifeng Zhang, Masao Gen, Zhancong Liang

et al.

Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(3), P. 1605 - 1614

Published: Jan. 13, 2022

Glyoxal is an important precursor of aqueous secondary organic aerosol (aqSOA). Its photooxidation to form acids and oligomers reactions with reduced nitrogen compounds brown carbon (BrC) have been extensively investigated separately, although these two types can occur simultaneously during the daytime. Here, we examine glyoxal BrC formation in premixed NH4NO3 + droplets. We find that nitrate photolysis photosensitization enhance decay rates by a factor ∼5 ∼6 compared those under dark, respectively. A significantly enhanced rate ∼12 was observed presence both photosensitization. Furthermore, new phase formed irradiated droplets, which had no noticeable degradation prolonged photooxidation. It attributed imidazole oxidation mediated and/or The persistent suggests potential contribute SOA ambient fine particles. This study highlights atmospheric sink glyoxal, may partially narrow gap between model predictions field measurements concentrations.

Language: Английский

Citations

77
Sulfate Formation in Incense Burning Particles: A Single-Particle Mass Spectrometric Study DOI
Zhancong Liang, Liyuan Zhou, Rosemarie Ann Infante Cuevas

et al.

Environmental Science & Technology Letters, Journal Year: 2022, Volume and Issue: 9(9), P. 718 - 725

Published: Aug. 26, 2022

Incense burning is a common ritual in Asian communities, and it emits massive amounts of particles. These particles can undergo atmospheric aging upon exposure to sunlight other pollutants. In this work, we observed sulfate formation fresh incense SO2, using single-particle aerosol mass spectrometer (SPAMS). Analysis the positive spectra classified as K-type OC-type. both dark light experiments, SO2 uptake oxidation were found preferentially OC-type over Sulfate formation, represented by number fraction sulfate-containing (FS), under was likely due gaseous oxidants. FS increased with UV, mainly attributable photosensitization reactions. While more formed at higher relative humidity (RH) dark, independent RH. The increase photochemistry effective lower RH, where photoactive compounds concentrated generated photo-oxidants. This effect outweighed that reduced dissolution. Since contain organic photosensitizers have also been biomass particles, our findings could shed on potential trigger formation.

Language: Английский

Citations

46
Single-particle Raman spectroscopy for studying physical and chemical processes of atmospheric particles DOI Creative Commons
Zhancong Liang, Yangxi Chu, Masao Gen

et al.

Atmospheric chemistry and physics, Journal Year: 2022, Volume and Issue: 22(5), P. 3017 - 3044

Published: March 7, 2022

Abstract. Atmospheric particles experience various physical and chemical processes change their properties during lifetime. Most studies on atmospheric particles, both in laboratory field measurements, rely analyzing an ensemble of particles. Because different mixing states individual only average can be obtained from using ensembles To better understand the fate environmental impacts investigations at a single-particle level are valuable. Among wealth analytic techniques, Raman spectroscopy provides unambiguous characterization under pressure non-destructive situ manner. This paper comprehensively reviews application such technique including particle hygroscopicity, phase transition separation, solute–water interactions, pH, multiphase reactions. Investigations enhanced bioaerosols basis also reviewed. For each application, we describe principle representative examples studies. Finally, present our views future directions development further applications studying

Language: Английский

Citations

44
Comparison of aqueous secondary organic aerosol (aqSOA) product distributions from guaiacol oxidation by non-phenolic and phenolic methoxybenzaldehydes as photosensitizers in the absence and presence of ammonium nitrate DOI Creative Commons

Brix Raphael Go,

Yongjie Li, Dan Dan Huang

et al.

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(4), P. 2859 - 2875

Published: March 2, 2023

Abstract. Aromatic carbonyls (e.g., methoxybenzaldehydes), an important class of photosensitizers, are abundant in the atmosphere. Photosensitization and nitrate-mediated photo-oxidation can occur simultaneously, yet studies about their interactions, particularly for aqueous secondary organic aerosol (aqSOA) formation, remain limited. This study compared non-phenolic (3,4-dimethoxybenzaldehyde, DMB) phenolic (vanillin, VL) methoxybenzaldehydes as photosensitizers aqSOA formation via guaiacol (GUA) oxidation absence presence ammonium nitrate (AN) under atmospherically relevant cloud fog conditions. GUA by triplet excited states DMB (3DMB∗) (GUA + was ∼ 4 times faster exhibited greater light absorption than 3VL∗ VL). Both VL formed composed oligomers, functionalized monomers, oxygenated ring-opening species, N-containing products AN. The observation N-heterocycles such imidazoles indicates participation reactions. majority generated comprises potential brown carbon (BrC) chromophores. Oligomerization functionalization dominated VL, but appeared to be more due contributions from itself. AN did not significantly affect kinetics, it had distinct effects on product distributions, likely differences photosensitizing abilities structural features VL. In particular, extensive fragmentation AN, increased oligomers may VL-derived phenoxy radicals induced ⚫OH or ⚫NO2 photolysis. Furthermore, nitrated observed both alone imply that photosensitized reactions promote nitration. work demonstrates how non-carbonyl phenol oxidation. Potential interactions between photosensitization photolysis were also elucidated. These findings facilitate a better understanding highlight importance these

Language: Английский

Citations

26
Decay Kinetics and Absorption Changes of Methoxyphenols and Nitrophenols during Nitrate-Mediated Aqueous Photochemical Oxidation at 254 and 313 nm DOI
Yalin Wang,

Wanyi Huang,

Linhui Tian

et al.

ACS Earth and Space Chemistry, Journal Year: 2022, Volume and Issue: 6(4), P. 1115 - 1125

Published: March 28, 2022

Brown carbon (BrC) absorbs radiation in the near-UV and visible ranges, affecting atmospheric photochemistry radiative forcing. Our understanding on photochemical transformation of BrC is still limited, especially when mixed with abundant photochemically labile inorganic salt, nitrate. Herein, we investigate reactions four chromophores, including two methoxyphenols nitrophenols. Experiments were conducted absence presence different concentrations H2O2 nitrate lights 254 313 nm. The results show that pseudo-first-order decay rate constants (k) these compounds at nm illumination approximately 10 times lower than those nm, demonstrating longer lifetimes chromophores under tropospherically relevant irradiation. Photo-enhancement range was observed most experiments, lasting longer, indicating prolonged effects nascent transformed Methoxyphenols had higher averaged k values nitrophenols during direct photolysis or lights, but for high-nitrate (or high-H2O2) conditions approached methoxyphenols. photo-enhancement substantially contributed by nitro products, while mainly hydroxylated and/or dimerized products. reveal similarity difference between nitrophenols, which may help better understand aging types model representation their

Language: Английский

Citations

32
Aqueous-phase chemistry of atmospheric phenolic compounds: A critical review of laboratory studies DOI
Fenghua Li, Shengzhen Zhou, Lin Du

et al.

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 856, P. 158895 - 158895

Published: Sept. 18, 2022

Language: Английский

Citations

30
Sulfate formation via aerosol-phase SO2 oxidation by model biomass burning photosensitizers: 3,4-dimethoxybenzaldehyde, vanillin and syringaldehyde using single-particle mixing-state analysis DOI Creative Commons
Liyuan Zhou, Zhancong Liang,

Brix Raphael Go

et al.

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(9), P. 5251 - 5261

Published: May 10, 2023

Abstract. Atmospheric oxidation of sulfur dioxide (SO2) to sulfate has been widely investigated by means gas-phase and in-cloud chemistry studies. Recent field measurements have shown significant formation in cloud-free environments with high aerosol loadings. As an important fraction biomass burning components, particulate phenolic non-phenolic aromatic carbonyls may initiate photosensitized multiphase SO2 aerosols, which our knowledge however is still its nascent stage. In this study, on the basis single-particle mass spectrometry (SPAMS) measurements, we find evident biomass-burning-derived photosensitizer particles under UV exposure, attributable S(IV), while almost no was observed dark conditions. The efficiency production irradiation, represented number percentage sulfate-containing (99 %–43 %) relative peak area (RPA) (0.67–0.12) spectra, descending order, were 3,4-dimethoxybenzaldehyde (DMB), vanillin (VL) syringaldehyde (SyrAld). Internal mixtures VL potassium nitrate (KNO3) gave a slightly lower RPA than alone. externally mixed KNO3 particles, predominantly formed former, confirming that via photosensitization prevails over photolysis. Our results suggest S(IV) could make contribution formation, especially areas influenced burning.

Language: Английский

Citations

19
Aqueous-Phase Photoreactions of Mixed Aromatic Carbonyl Photosensitizers Yield More Oxygenated, Oxidized, and less Light-Absorbing Secondary Organic Aerosol (SOA) than Single Systems DOI Creative Commons

Brix Raphael Go,

Yongjie Li, Dan Dan Huang

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(18), P. 7924 - 7936

Published: April 23, 2024

Aromatic carbonyls have been mainly probed as photosensitizers for aqueous secondary organic aerosol (aqSOA) and light-absorbing (i.e., brown carbon or BrC) formation, but due to their nature, they can also undergo oxidation form aqSOA BrC. However, photochemical transformations of aromatic carbonyl photosensitizers, particularly in multicomponent systems, are understudied. This study explored formation from the irradiation mixed single systems under cloud/fog conditions. Mixed consisting phenolic only (VL + ActSyr SyrAld: vanillin [VL] acetosyringone [ActSyr] syringaldehyde [SyrAld]) another composed both nonphenolic (DMB 3,4-dimethoxybenzaldehyde [DMB], a carbonyl, SyrAld) were compared VL (VL*) DMB (DMB*), respectively. In shorter lifetimes indicate diminished capacity trigger other compounds (e.g., guaiacol [GUA], noncarbonyl phenol). contrast slow decay minimal photoenhancement DMB*, rapid photodegradation significant VL* efficient direct photosensitized self-photosensitization). Relative increased oxidant availability promoted functionalization SyrAld accelerated conversion early generation SyrAld. Moreover, oxidizable substrates countered by stronger oxidative limited contribution light absorption. suggests weaker radiative effect BrC photosensitizer than systems. Furthermore, more oxygenated oxidized was observed with increasing complexity reaction < GUA). work offers new insights into emphasizing dual role sources substrates.

Language: Английский

Citations

6
Role of Direct and Sensitized Photolysis in the Photomineralization of Dissolved Organic Matter and Model Chromophores to Carbon Dioxide DOI
Shelby Buckley, Frank Leresche, Kari E. Norris

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(31), P. 13808 - 13819

Published: July 24, 2024

This study addresses the fundamental processes that drive photomineralization of dissolved organic matter (DOM) to carbon dioxide (CO

Language: Английский

Citations

6