A5045624998- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Atmospheric Ozone and Climate
- Stability and Control of Uncertain Systems
- Indoor Air Quality and Microbial Exposure
- Advanced Chemical Sensor Technologies
- Vehicle emissions and performance
- Water Quality Monitoring and Analysis
- Aquaculture disease management and microbiota
- Power Systems and Renewable Energy
- Mass Spectrometry Techniques and Applications
- Advanced Control Systems Optimization
- Atmospheric aerosols and clouds
- Power System Optimization and Stability
- Robotic Path Planning Algorithms
- Catalytic Processes in Materials Science
- Odor and Emission Control Technologies
- HVDC Systems and Fault Protection
- Spectroscopy and Laser Applications
- Building Energy and Comfort Optimization
- Neural Networks Stability and Synchronization
- Control Systems and Identification
- Robotics and Sensor-Based Localization
- Aquaculture Nutrition and Growth
Shanghai Academy of Environmental Sciences
2018-2025
Sun Yat-sen University
2022-2025
Ministry of Ecology and Environment
2025
Wuhan Textile University
2025
State Grid Corporation of China (China)
2024
Chongqing University of Technology
2023
China Academy Of Machinery Science & Technology (China)
2022-2023
Chinese Academy of Sciences
2022-2023
Institute of Applied Ecology
2022-2023
China Electric Power Research Institute
2020-2022
Significance Secondary organic aerosol (SOA) plays a pivotal role in climate and air quality. Characterizing the molecular makeup of SOA has been major research goal for several decades, yet chemical dynamics most anthropogenic biogenic systems remain poorly resolved. We report here time-resolved characterization derived from canonical α-pinene system, one abundant emissions troposphere. reveal distinct features components terms structure, abundance, growth rates, evolution patterns,...
Abstract Severe events of wintertime particulate air pollution in Beijing (winter haze) are associated with high relative humidity (RH) and fast production sulfate from the oxidation sulfur dioxide (SO 2 ) emitted by coal combustion. There has been considerable debate regarding mechanism for SO oxidation. Here we show evidence field observations a haze event that rapid nitrogen (NO nitrous acid (HONO) takes place, latter producing oxide (N O). Sulfate shifts to larger particle sizes during...
Heterogeneous oxidation of sulfur dioxide (SO2) is suggested to be one the most important pathways for sulfate formation during extreme haze events in China, yet exact mechanism remains highly uncertain. We propose a much less explored pathway aqueous-phase SO2 particulate by NO2 and OH radicals produced from photolysis nitrate. Reactive uptake experiments with ammonium nitrate particles under ultraviolet irradiation show measured coefficients ∼10–5. Model calculations production rates,...
Abstract. Vanillin (VL), a phenolic aromatic carbonyl abundant in biomass burning emissions, forms triplet excited states (3VL∗) under simulated sunlight leading to aqueous secondary organic aerosol (aqSOA) formation. Nitrate and ammonium are among the main components of aerosols cloud or fog water. Under atmospherically relevant conditions, solutions composed either VL only with nitrate were subjected irradiation compare aqSOA formation via direct photosensitized oxidation absence presence...
We investigate the effects of sulfate and nitrate on formation evolution secondary organic aerosol formed in aqueous phase (aqSOA) from photooxidation two phenolic carbonyls emitted wood burning. AqSOA was efficiently both syringaldehyde (C9H10O4) acetosyringone (C10H12O4) ammonium solutions, with mass yields ranging 30% to 120%. Positive matrix factorization spectra acquired by an Aerosol Mass Spectrometer revealed a combination functionalization, oligomerization, fragmentation processes...
Heterogeneous oxidation of SO2 is one the promising mechanisms to account for high loading sulfate during severe haze periods in China. Our earlier work reported on by OH and NO2 produced 250 nm nitrate photolysis (Environ. Sci. Technol. Lett. 2019, 6, 86-91). Here, we extend that examine production at 300 irradiation, which can additionally generate NO2- or HNO2, N(III). Flow cell/in situ Raman experiments showed reactive uptake coefficient SO2, γSO2, be expressed as γSO2 = 1.64 × pNO3-,...
Abstract. We present here experimental results on aqueous-phase (A) photochemical oxidation (with UV and OH radicals generated from H2O2 photolysis) (B) direct photolysis only irradiation) of a methoxy phenol, vanillin (VL), as model compound biomass burning. Both on-line aerosol mass spectrometric (AMS) characterization off-line chemical analyses were performed. AMS dried atomized droplets the bulk reacting mixtures showed that VL almost entirely evaporates during drying process. Large...
Cooking emissions have been identified as a major source of primary organic aerosol (POA) in urban environments. may also be potential secondary (SOA) because the abundant non-methane gases. We studied SOA formation from photooxidation seven vegetable oils heated at 200 °C under high-NOx conditions smog chamber. After samples had aged an OH exposure 1.0 × 1010 molecules cm–3 s, rate was generally 1 order magnitude higher than POA emission rate. determined that alkenals, which are not...
Organic sulfur compounds have been identified in ambient secondary organic aerosols, but their contribution to mass is not well quantified. In this study, using a high-resolution time-of-flight aerosol spectrometer (AMS), concentrations of were estimated based on the fragmentation patterns methanesulfonic acid (MSA), and organosulfates (OS), including alkyl, phenyl, cycloalkyl sulfates, obtained laboratory experiments. Mass MSA minimum OS determined field campaign conducted at coastal site...
Molecular markers in ambient organic aerosol (OA) provide highly specific source information. Their traditional quantification is based on offline analysis of filter samples, and the coarse time resolution labor-intensive nature hugely limit utility tracer data. In this study, hourly molecular fine particulate matter were measured using a recently commercialized thermal desorption gas chromatography–mass spectrometry (TAG) technique at an urban location Shanghai, China during three-week...
Abstract Isoprene (2‐methyl‐1, 3‐butadiene) is a nonmethane volatile organic compound (VOC) with the largest global emission and high reactivity. The oxidation of isoprene crucial to atmospheric photochemistry contributes significantly formation secondary aerosol. Here, we conducted comprehensive observations in polluted megacities Nanjing Shanghai during summer 2018. We identified multiple functionalized products, which 72% 88% total mole concentration were nitrogen‐containing species...
Cooking organic aerosol (COA) is an important source of particulate pollutants in urbanized regions. Yet, the diversity and complexity COA components make direct identification quantification difficult. In this study, we conducted collocated OA measurements with mass spectrometer (AMS) a thermal desorption gas chromatography-mass (TAG) Shanghai. molecular tracers (e.g., C18 fatty acids, azelaic acid) measured by TAG provide unambiguous information for evaluating tracer ion (C6H10O+, m/z 98)...
A prominent source of hydroxyl radicals (
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...
Aqueous-phase reactions of α-dicarbonyls with ammonium or amines have been identified as important sources secondary brown carbon (BrC). However, the identities most chromophores in these and effects pH remain largely unknown. In this study, chemical structures, formation pathways, optical properties individual BrC formed through aqueous (glyoxal methylglyoxal) ammonium, amino acids, methylamine at different pH's were characterized detail by liquid chromatography-photodiode array-high...
Aqueous-phase reactions of α-dicarbonyls with amines or ammonium have been identified as important sources secondary brown carbon (BrC). However, the kinetics BrC formation and effects pH are still not very clear. In this study, by aqueous (glyoxal methylglyoxal) ammonium, amino acids, alkylamines in bulk solution at different values investigated. Our results reveal pH-parameterized production rate constants, kBrCII (m–1 [M]−2 s–1), based on light absorption between 300 500 nm: log10(kBrCII)...
Reactions between dissolved ammonia and carbonyls, which form light-absorbing species in atmospheric particles, can be accelerated by actively removing water from the reaction system. Here, we examine effects of relative humidity (RH) on reactive uptake glyoxal (Gly) aqueous particles ammonium sulfate (AS), bisulfate, sodium sulfate, magnesium nitrate (AN), nitrate. In situ Raman analysis was used to quantify particle-phase Gly a colored product, 2,2′-biimidazole (BI), as function time....
The production of secondary organic aerosols (SOA) from toluene photochemistry in Shanghai, a megacity China, was estimated by two approaches, the parametrization method and tracer-based method. temporal profiles toluene, together with other fifty-six volatile compounds (VOCs), were characterized. Combing vapor wall loss corrected SOA yields derived chamber experiments, as embodied two-product model contributes up to ∼40% total budget during summertime. 2,3-Dihydroxy-4-oxopentanoic acid...
Abstract Aerosol nitrate has become the most abundant compound during aerosol pollution in eastern China. The Chinese government implemented a stringent policy 2013–2017 to tackle pollution. However, response of nitrogen oxides (NO x ) reduction is unclear owing limitation long‐term measurement. Here, we performed 9‐year continuous measurement compositions Shanghai and confirmed decrease species except nitrate. contribution fine particulate matter (PM 2.5 increased significantly, reaching up...
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...
Secondary organic aerosol (SOA) formation from gasoline vehicles spanning a wide range of emission types was investigated using an oxidation flow reactor (OFR) by conducting chassis dynamometer tests. Aided advanced mass spectrometric techniques, SOA precursors, including volatile compounds (VOCs) and intermediate/semivolatile (I/SVOCs), were comprehensively characterized. The reconstructed produced the speciated VOCs I/SVOCs can explain 69% measured downstream OFR upon 0.5–3 days' OH...