Biogenic secondary organic aerosols: A review on formation mechanism, analytical challenges and environmental impacts

Chemosphere, Journal Year: 2020, Volume and Issue: 262, P. 127771 - 127771

Published: Aug. 7, 2020

Language: Английский

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Multigeneration Production of Secondary Organic Aerosol from Toluene Photooxidation

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(13), P. 8592 - 8603

Published: June 17, 2021

Photooxidation of volatile organic compounds (VOCs) produces secondary aerosol (SOA) and light-absorbing brown carbon (BrC) via multiple reaction steps/pathways, reflecting significant chemical complexity relevant to gaseous oxidation subsequent gas-to-particle conversion. Toluene is an important VOC under urban conditions, but the fundamental mechanism leading SOA formation remains uncertain. Here, we elucidate multigeneration production from toluene by simultaneously tracking evolutions gas-phase in a chamber. Large size increase browning monodisperse sub-micrometer seed particles occur shortly after initiating hydroxyl radical (OH) at 10–90% relative humidity (RH). The evolution products properties (size/density/optical properties) speciation aerosol-phase indicate that growth result earlier generation consisting dominantly dicarbonyl carboxylic functional groups. While dicarbonyls engage aqueous reactions yield nonvolatile oligomers nitrogen heterocycles/heterochains (in presence NH3) high RH, acids contribute carboxylates ionic dissociation or acid–base wide RH range. We conclude contributes importantly SOA/BrC because their prompt yields photooxidation unique functionalities for participation reactions.

Language: Английский

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Advances in selective catalytic oxidation of ammonia (NH3-SCO): A review of catalyst structure-activity relationship and design principles

Chinese Chemical Letters, Journal Year: 2023, Volume and Issue: 35(1), P. 108432 - 108432

Published: April 6, 2023

Language: Английский

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Mitigating air pollution benefits multiple sustainable development goals in China

Environmental Pollution, Journal Year: 2024, Volume and Issue: 349, P. 123992 - 123992

Published: April 15, 2024

Language: Английский

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Anthropogenic–Biogenic Interactions at Night: Enhanced Formation of Secondary Aerosols and Particulate Nitrogen- and Sulfur-Containing Organics from β-Pinene Oxidation

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(12), P. 7794 - 7807

Published: May 28, 2021

Mixing of anthropogenic gaseous pollutants and biogenic volatile organic compounds impacts the formation secondary aerosols, but still in an unclear manner. The present study explores aerosol via interactions between β-pinene, O3, NO2, SO2, NH3 under dark conditions. Results showed that yield can be largely enhanced by more than 330% NO2 or SO2 slightly 39% when ratio inorganic gases to β-pinene ranged from 0 1.3. Joint effects existed as yields increased with decreased was kept constant. Infrared spectra nitrogen-containing components derived sulfur-containing species SO2. Several particulate nitrates (MW 215, 229, 231, 245), organosulfates 250, 264, 280, 282, 284), nitrooxy 295, 311, 325, 327, 343) were identified using high-resolution orbitrap mass spectrometry experiments, their mechanism is discussed. Most these nitrogen- have been reported ambient particles. Our results suggest complex among during night might serve a potential pathway for organics, especially polluted regions both influences.

Language: Английский

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Mixed potential type NH3 sensor based on YSZ solid electrolyte and metal oxides (NiO, SnO2, WO3) modified FeVO4 sensing electrodes

Sensors and Actuators B Chemical, Journal Year: 2021, Volume and Issue: 343, P. 130043 - 130043

Published: April 27, 2021

Language: Английский

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Synergetic effects of NH<sub>3</sub> and NO<sub><i>x</i></sub> on the production and optical absorption of secondary organic aerosol formation from toluene photooxidation

Atmospheric chemistry and physics, Journal Year: 2021, Volume and Issue: 21(23), P. 17759 - 17773

Published: Dec. 6, 2021

Abstract. NH3 is the most important alkaline gas in atmosphere and one of key species affecting behaviors atmospheric aerosols. However, impact on secondary organic aerosol (SOA) formation remains poorly understood, especially dynamic evolution chemical compositions SOA process. In this study, a series chamber experiments were performed to probe individual common effects NOx toluene through OH photooxidation. The characterized using Aerodyne high-resolution time-of-flight mass spectrometer (AMS). yield increased from 28.1 % absence 34.7 presence but decreased 19.5 NOx. highest 42.7 lowest carbon oxidation state (OSC) occurred both NOx, indicating that higher-volatility products formed could partition into particle phase when was added. This resulted synergetic effect co-existed. heterogeneous reaction main pathway by which participated photooxidation also observed optical absorption. A peak at 280 nm, characteristic organonitrogen imidazole compounds, NH3, its intensity added chamber. work improves our understanding how synergistic interactions between influence offers new insights mitigating haze pollution.

Language: Английский

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Partitioning of Organonitrates in the Production of Secondary Organic Aerosols from α-Pinene Photo-Oxidation

Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(9), P. 5421 - 5429

Published: April 12, 2022

The chemical pathways for the production of secondary organic aerosols (SOA) are influenced by concentration nitrogen oxides (NOx), including organonitrates (ON). Herein, a series experiments conducted in an environmental chamber investigated and partitioning total from α-pinene photo-oxidation <1 to 24 ppb NOx. Gas-phase particle-phase (gON pON, respectively) were measured laser-induced fluorescence (LIF). composition particle phase mass simultaneously characterized online aerosol spectrometry. LIF MS measurements pON concentrations had Pearson correlation coefficient 0.91 0.3 1.1 μg m–3. For 1–6 NOx, yield SOA increased 0.02 0.044 with NOx concentration. >6 steadily dropped, reaching 0.034 at By comparison, 0.002 0.022 across range concentrations. gON likewise 0.005 0.148. gas-to-particle ratio (pON/(pON + gON)) depended strongly on concentration, changing 0.27 0.13 as ppb. In atmosphere, there is typically cross-over point between clean polluted conditions that affects production, results herein quantitatively identify 6 under these study conditions, organonitrates. trends function occur because changes volatility.

Language: Английский

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A review on vulnerable atmospheric aerosol nanoparticles: Sources, impact on the health, ecosystem and management strategies

Journal of Environmental Management, Journal Year: 2024, Volume and Issue: 365, P. 121644 - 121644

Published: July 3, 2024

Language: Английский

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Enhancing effect of NO2 on the formation of light-absorbing secondary organic aerosols from toluene photooxidation

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 794, P. 148714 - 148714

Published: June 27, 2021

Language: Английский

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