Modeling the Formation of Organic Compounds across Full Volatility Ranges and Their Contribution to Nanoparticle Growth in a Polluted Atmosphere DOI
Zeqi Li, Bin Zhao, Dejia Yin

et al.

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 58(2), P. 1223 - 1235

Published: Dec. 20, 2023

Nanoparticle growth influences atmospheric particles' climatic effects, and it is largely driven by low-volatility organic vapors. However, the magnitude mechanism of organics' contribution to nanoparticle in polluted environments remain unclear because current observations models cannot capture organics across full volatility ranges or track their formation chemistry. Here, we develop a mechanistic model that characterizes spectrum vapors contributions coupling advanced oxidation modeling kinetic gas-particle partitioning. The applied Nanjing, typical city, effectively captures distribution (with saturation vapor concentrations <0.3 μg/m3), thus accurately reproducing rates (GRs), with 4.91% normalized mean bias. Simulations indicate as particles grow from 4 40 nm, relative fractions GRs attributable increase 59 86%, remaining H2SO4 its clusters. Aromatics contribute much condensable (∼37%), especially (∼61%), contributing most (32–46%) 4–40 nm grow. Alkanes also 19–35% GRs, while biogenic volatile compounds minimally (<13%). Our helps assess impacts predict future changes.

Language: Английский

Recent progress on VOC pollution control via the catalytic method DOI
Honghong Zhang, Zhiwei Wang,

Lu Wei

et al.

CHINESE JOURNAL OF CATALYSIS (CHINESE VERSION), Journal Year: 2024, Volume and Issue: 61, P. 71 - 96

Published: June 1, 2024

Language: Английский

Citations

17
Aqueous-Phase Reactions of Anthropogenic Emissions Lead to the High Chemodiversity of Atmospheric Nitrogen-Containing Compounds during the Haze Event DOI
Hongxing Jiang, Junjie Cai, Xinxin Feng

et al.

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(43), P. 16500 - 16511

Published: Oct. 16, 2023

Nitrogen-containing organic compounds (NOCs), a type of important reactive-nitrogen species, are abundant in aerosols haze events observed Northern China. However, due to the complex nature NOCs, sources, formation, and influencing factors still ambiguous. Here, molecular composition matters (OMs) hourly PM2.5 samples collected during event China was characterized using Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). We found that CHON (formulas containing C, H, O, N atoms) dominated OM fractions showed high chemodiversity transformability. Relying on newly developed revised-workflow oxidation-hydrolyzation knowledge for compounds, 64% major aromatic (>80%) could be derived from oxidization or hydrolyzation processes. Results FT-ICR MS data analysis further aerosol liquid water (ALW)-involved aqueous-phase reactions distribution aromatic-CHON besides coal combustion, ALW-involved compound formation daytime nighttime different. Our results improve understanding composition, potential which can help advance evolution, control haze.

Language: Английский

Citations

20
Construction of HKUST-1@Cu nanofibers with thermal conductive adsorption sites for synchronous enhancement of toluene adsorption and desorption efficiency DOI
Liming Liu, Junjie Li,

Sidra Subhan

et al.

Separation and Purification Technology, Journal Year: 2024, Volume and Issue: 339, P. 126624 - 126624

Published: Feb. 7, 2024

Language: Английский

Citations

8
Molecular Characterization of Oxygenated Organic Molecules and Their Dominating Roles in Particle Growth in Hong Kong DOI
Penggang Zheng, Yi Chen, Zhe Wang

et al.

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(20), P. 7764 - 7776

Published: May 8, 2023

Oxygenated organic molecules (OOMs) are critical intermediates linking volatile compound oxidation and secondary aerosol (SOA) formation. Yet, the understanding of OOM components, formation mechanism, impacts still limited, especially for urbanized regions with a cocktail anthropogenic emissions. Herein, ambient measurements OOMs were conducted at regional background site in South China 2018. The molecular characteristics revealed dominant nitrogen-containing products, influences different factors on composition state elucidated. Positive matrix factorization analysis resolved complex species to featured fingerprint from pathways. A new method was developed identify key functional groups OOMs, which successfully classified majority into carbonyls (8%), hydroperoxides (7%), nitrates (17%), peroxyl (10%), dinitrates (13%), aromatic ring-retaining (6%), terpenes (7%). volatility estimation improved based their identified used simulate growth process contributed by condensation those low-volatile OOMs. results demonstrate predominant role contributing sub-100 nm particle SOA highlight importance products multistep oxidation.

Language: Английский

Citations

11
Oxygenated organic molecules produced by low-NOx photooxidation of aromatic compounds: contributions to secondary organic aerosol and steric hindrance DOI Creative Commons
Xi Cheng, Yongjie Li, Yan Zheng

et al.

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(4), P. 2099 - 2112

Published: Feb. 19, 2024

Abstract. Oxygenated organic molecules (OOMs) produced by the oxidation of aromatic compounds are key components secondary aerosol (SOA) in urban environments. The steric effects substitutions and rings role reaction pathways altering OOM distributions remain unclear because lack systematic multi-precursor study over a wide range OH exposure. In this study, we conducted flow-tube experiments used nitrate adduct time-of-flight chemical ionization mass spectrometer (NO3--TOF-CIMS) to measure OOMs photooxidation six precursors under low-NOx conditions. For single precursors, detected peak clusters show an oxygen atom difference one or two, indicating involvement multi-step auto-oxidation alkoxy radical pathways. Multi-generation is needed explain diverse hydrogen numbers observed formulae. particular, for double-ring at higher exposure, multi-generation may have significantly enriched dimer results suggest that methyl precursor lead less fragmented products, while structure corresponds efficient formation closed-shell monomeric dimeric both highlighting significant molecular on formation. Naphthalene-derived however lower volatilities greater SOA contributions than other-type OOMs, which be more important initial particle growth. Overall, identified NO3--TOF-CIMS contributed up 30.0 % measured mass, suggesting oxygenated, undetected semi-volatile products. Our highlight roles progressive oxidation, substitution ring from need considered future model developments improve performance aerosol.

Language: Английский

Citations

3
Rapid Classification of OVOC Samples through a Dynamic Cataluminescence Sensor Coupled with a Code-Triggered Global Plasma-Activated System DOI
Chudong Wei, Cheng Chen, Jiacheng Tang

et al.

Analytical Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: March 11, 2025

Integrated cataluminescence (CTL) sensing for both identification and quantification has become the focus in gas-sensing methods. With development of an integrated circuit, inspiration from electronic automation provided a convenient approach application CTL sensors. Here, global dielectric barrier discharge plasma system supported by digital code is raised process-oriented sampling gaseous dynamic dual-route reaction rapid quantitative qualitative analysis oxidative volatile organic compounds (OVOCs). Coupled with material Tb-doped yttrium aluminum garnet (Tb-YAG), CTGPA-CTL LODs 8.80 ppm methanol 8.08 ethanol as typical targets, 11 liquor-relative OVOCs were successfully identified blind process. In practice, 4 main types flavors Chinese liquors distinguished obviously different features judged commercial artificial intelligence on signals, providing promising prospect new virtual sensor array wider applications.

Language: Английский

Citations

0
Optimized M-CeO2 (M = Mn, Co, Ni, and Cu) catalysts for enhancing the oxidation of alkane VOC (n-pentane): Synergistic effects of doping, interfacing, defects, atom-burry, and redox pairs DOI
Chao Hu,

Zihao Hu,

Yinggui Zhang

et al.

Separation and Purification Technology, Journal Year: 2025, Volume and Issue: unknown, P. 133129 - 133129

Published: April 1, 2025

Language: Английский

Citations

0
Low-NO-like Oxidation Pathway Makes a Significant Contribution to Secondary Organic Aerosol in Polluted Urban Air DOI

Chenshuo Ye,

Ying Liu, Bin Yuan

et al.

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(37), P. 13912 - 13924

Published: Sept. 5, 2023

Anthropogenic pollutants can greatly mediate formation pathways and chemical compositions of secondary organic aerosol (SOA) in urban atmospheres. We investigated the molecular tracers for different types SOA PM2.5 under varying NO/NO2 conditions Guangzhou using source analysis particle-phase speciated organics obtained from an iodide ionization mass spectrometer with a Filter Inlet Gases AEROsols (FIGAERO-I-CIMS). Results show that low-NO-like (when < 0.2) explained ∼75% total measured FIGAERO-OA during regional transport periods, which was enriched more-oxidized C4-C6 non-nitrogenous compounds over ozone accumulation. Daytime high-NO chemistry played larger roles (38%) local pollution episodes, nitrates (ONs) nitrophenols increasing enhanced water content nitrate fraction. Nighttime NO3-initiated oxidation, characterized by monoterpene-derived ONs, accounted comparable percentages (10-12%) both two periods. Furthermore, presence organosulfates (OSs) improves understanding aqueous-phase processes production. Carbonyl-derived OSs exhibited preferential high acidity and/or abundant sulfate, correlated well SOA. Our results demonstrate importance ratios controlling compositions, as interactions between content, acidity, inorganic salts gas-to-particle partitioning condensable organics.

Language: Английский

Citations

9
Molecular Composition of Anthropogenic Oxygenated Organic Molecules and Their Contribution to Organic Aerosol in a Coastal City DOI

Chen Yang,

Nianci Yao,

Lingling Xu

et al.

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(42), P. 15956 - 15967

Published: Oct. 16, 2023

Organic aerosols (OA) have gained attention as a substantial component of atmospheric owing to their impact on visibility, climate, and human health. Although oxygenated organic molecules (OOMs) are essential contributors OA formation, the sources, transformations, fates OOMs not fully understood. Herein, anthropogenic (AOOMs), volatile compounds (AVOCs), were concurrently measured in Xiamen, coastal city southeastern China. Our results show that AOOMs exhibited high nitrogen content (76%) low oxidation degree. Strong photochemical processes aromatic VOCs predominant sources AOOMs. Also, NOx concentrations occurrence multigeneration OH radical oxidations critical factors might influence formation Finally, newly developed aerosol dynamic model's more than 35% mass growth rate is attributed gas-particle partitioning Further sensitivity testing demonstrates contribution significantly enhanced during high-particulate-concentration periods, especially under low-temperature conditions. This study emphasizes vital role photochemically produced derived from AVOCs urban atmosphere.

Language: Английский

Citations

4
Resolving Atmospheric Oxygenated Organic Molecules in Urban Beijing Using Online Ultrahigh-Resolution Chemical Ionization Mass Spectrometry DOI
Yi Yuan, Xin Chen, Runlong Cai

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 27, 2024

Gaseous oxygenated organic molecules (OOMs) are crucial precursors of atmospheric aerosols. OOMs in urban atmospheres have complex compositions, posing challenges to understanding their formation, evolution, and influences. In this study, we identify 2403 gaseous Beijing using online nitrate-based chemical ionization Orbitrap mass spectrometry based on one-year measurements. We find that can be identified with higher accuracy wider coverage, compared previously used spectrometry. With optimized OOM resolving capabilities, previous knowledge expanded. First, clear homologous oxygen-addition characteristics the revealed. Second, lower concentrations or masses characterized high confidence, e.g., above 350 Da. particular, dimers (e.g., C

Language: Английский

Citations

1