Journal of Korean Society for Atmospheric Environment, Journal Year: 2023, Volume and Issue: 39(5), P. 866 - 904
Published: Oct. 31, 2023
Language: Английский
Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(28)
Published: May 16, 2023
The selective conversion of dilute NO pollutant into low-toxic product and simultaneous storage metabolic nitrogen for crop plants remains a great challenge from the perspective waste management sustainable chemistry. This study demonstrates that this bottleneck can be well tackled by refining reactive oxygen species (ROS) on Ni-modified NH2 -UiO-66(Zr) (Ni@NU) using nickel foam (NF) as three-dimensional (3D) substrate through flow photoanode reactor via gas-phase photoelectrocatalysis. By rationally ROS to ⋅OH, Ni@NU/NF rapidly eliminate 82 % without releasing remarkable NO2 under low bias voltage (0.3 V) visible light irradiation. abundant mesoporous pores are conducive diffusion formed nitrate, which enables progressive nitrate with selectivity over 99 long-term use. Through calculation, 90 could recovered species, indicating state-of-the-art strategy capture, enrich recycle N source atmosphere. offers new treatment exploitation, may possess potential development highly efficient air purification systems industrial indoor NOx control.
Language: Английский
Citations
58
Atmosphere, Journal Year: 2024, Volume and Issue: 15(1), P. 115 - 115
Published: Jan. 18, 2024
In this study, we reviewed smog chamber systems and methodologies used in secondary organic aerosol (SOA) formation studies. Many important chambers across the world have been reviewed, including 18 American, 24 European, 8 Asian chambers. The characteristics of (location, reactor size, wall materials, light sources), measurement (popular equipment working principles), (SOA yield calculation wall-loss correction) are summarized. This review discussed key experimental parameters such as surface-to-volume ratio (S/V), temperature, relative humidity, intensity, effect that influence results experiment, how evolved for more accurate simulation atmospheric processes. addition, identifies sources uncertainties finding SOA yields originated from previous intensity installed artificial lights (photolysis rate NO2 varied 0.1/min to 0.40/min), density assumption (varied 1 g/cm3 1.45 g/cm3), management, background contaminants were identified uncertainty. developed studies minimize those also discussed.
Language: Английский
Citations
3
Atmospheric measurement techniques, Journal Year: 2024, Volume and Issue: 17(14), P. 4553 - 4579
Published: July 31, 2024
Abstract. The photooxidation of volatile organic compounds (VOCs) in the troposphere has important implications for air quality, weather, and climate. A deeper understanding underlying mechanisms can be achieved by studying these reactions under controlled conditions analysing emerging products. This requires dedicated laboratory infrastructure as well sensitive selective analytical techniques. Here, we constructed a new 300 L indoor Teflon atmospheric simulation chamber part Bayreuth ATmospheric CHambers (BATCH) infrastructure. was irradiated bandpass-filtered solar simulator that enabled experiments with realistic photon fluxes OH radical concentrations. It coupled to proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) solid-phase microextraction–gas chromatography–mass spectrometry (SPME-GC-MS) system on-line analysis precursor VOC its oxidation products gas phase. As SPME-GC-MS method, multifunctional oxygenated (carbonyls, alcohols, carboxylic acids) were derivatized O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine (PFBHA) N-trimethylsilyl-N-methyltrifluoroacetamide (MSTFA). We designed permeation source addition internal standards improve method reproducibility. joint setup tested validated OH-radical-induced toluene, one most abundant aromatic hydrocarbons atmosphere. For characterization, first derived photolysis rates several typical toluene BATCH (1.77 × 10−8–3.02 10−4 s−1). Additionally, wall loss determined empirically (4.54 10−6–8.53 10−5 s−1) then parameterized according fundamental molecular properties. cresols, compiled weighted calibration factor PTR-ToF-MS, taking into account isomer-specific sensitivities relative distribution SPME-GC-MS. improved instrumental agreement 14 %, whereas PTR-ToF-MS overestimated sum isomers 31 % compared concentrations when using averaged factor. Thus, combined data set offered insight both temporal trends isomeric composition. Finally, conducted six evaluate ring-retaining first-generation Based on loss-corrected concentrations, formation yields o-cresol (8.0 ± 1.8 %), m-cresol (0.4 0.1 p-cresol (2.4 0.6 benzyl alcohol (0.5 benzaldehyde (4.6 1.7 %) NOx-free at T = 298 1 K. These are consistent previous studies therefore serve proof concept our applied methods.
Language: Английский
Citations
2
The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 952, P. 175932 - 175932
Published: Aug. 31, 2024
Language: Английский
Citations
2
Angewandte Chemie, Journal Year: 2023, Volume and Issue: 135(28)
Published: May 16, 2023
Abstract The selective conversion of dilute NO pollutant into low‐toxic product and simultaneous storage metabolic nitrogen for crop plants remains a great challenge from the perspective waste management sustainable chemistry. This study demonstrates that this bottleneck can be well tackled by refining reactive oxygen species (ROS) on Ni‐modified NH 2 ‐UiO‐66(Zr) (Ni@NU) using nickel foam (NF) as three‐dimensional (3D) substrate through flow photoanode reactor via gas‐phase photoelectrocatalysis. By rationally ROS to ⋅OH, Ni@NU/NF rapidly eliminate 82 % without releasing remarkable under low bias voltage (0.3 V) visible light irradiation. abundant mesoporous pores are conducive diffusion formed nitrate, which enables progressive nitrate with selectivity over 99 long‐term use. Through calculation, 90 could recovered species, indicating state‐of‐the‐art strategy capture, enrich recycle N source atmosphere. offers new treatment exploitation, may possess potential development highly efficient air purification systems industrial indoor x control.
Language: Английский
Citations
5
Aerosol Science and Technology, Journal Year: 2024, Volume and Issue: 58(2), P. 170 - 180
Published: Jan. 18, 2024
Corrections for first-order particle losses to Teflon chamber walls are important sources of uncertainty in experimental studies formation and aging. Particle size distributions environmental factors significantly influence wall loss corrections; thus, it is characterize size-dependent profiles under myriad conditions that may alter deposition rates. This work investigated coefficients inorganic (ammonium sulfate, AS), organic (sorbitol, C6H14O6), mixed composition (AS + sorbitol, 1:1 by mole) particles a varying temperature (20–40 °C), relative humidity (RH, <10–80%), illumination (dark vs. 100% lights), water (crystalline deliquesced metastable), usage history (clean following chemical experiments). It was found lights had negligible minor effects on rates all particles, while RH, water, each major tested conditions. were higher humid than dry conditions, at similar RH. Chemical introduced acidic species the day prior experiment responsible uncertainties up ∼50% rate profiles, despite recommended flushing regimens. These data suggest sensitive OA or aging experiments consider obtaining same-day from target experiment. Otherwise, corrections should composition, history, possibly
Language: Английский
Citations
1
Atmospheric Pollution Research, Journal Year: 2024, Volume and Issue: unknown, P. 102361 - 102361
Published: Nov. 1, 2024
Language: Английский
Citations
1
Atmospheric measurement techniques, Journal Year: 2023, Volume and Issue: 16(15), P. 3679 - 3692
Published: Aug. 8, 2023
Abstract. Multiphase chemistry is an important pathway for the formation of secondary organic aerosols (SOAs) in atmosphere. In this study, indoor 2 m3 Teflon chamber system (Aerosol multIphase Research chamber, AIR) was developed and characterized to specifically simulate atmospheric multiphase processes. The temperature humidity controls, diurnal variation simulation, seed particle generation unit were designed meet needs simulating chemical reactions. AIR able accurately control (2.5–31 ± 0.15 ∘C) relative (RH <2 %–>95 % 0.75 %) over a relatively broad range. addition, RH regulation module inside ambient RH. aerosol generate pre-deliquescent particles with coating across wide range phase states or morphologies. thickness within can be precisely controlled through adjusting condensation temperature, further helping elucidate roles inner walls are passivated reduce wall loss rates reactive gases. Yield experiments α-pinene ozonolysis without combined box model simulation demonstrate high-quality performance using chamber.
Language: Английский
Citations
3
Journal of Environmental Sciences, Journal Year: 2022, Volume and Issue: 136, P. 570 - 582
Published: Dec. 29, 2022
Language: Английский
Citations
3
Published: March 20, 2024
Abstract. The photooxidation of volatile organic compounds (VOCs) in the troposphere has important implications for air quality, weather, and climate. A deeper understanding underlying mechanisms can be achieved by studying these reactions under controlled conditions analyzing emerging products. This requires dedicated laboratory infrastructure as well sensitive selective analytical techniques. Here, we constructed a new 300 L indoor Teflon atmospheric simulation chamber part Bayreuth ATmospheric CHambers (BATCH) infrastructure. was irradiated bandpass-filtered solar simulator that enabled experiments with realistic photon fluxes OH radical concentrations. It coupled to proton-transfer-reaction – time-of-flight mass spectrometer (PTR-ToF-MS) solid phase microextraction gas chromatography spectrometry (SPME-GC-MS) system on-line analysis precursor VOC its oxidation products phase. As SPME-GC-MS method, multifunctional oxygenated (carbonyls, alcohols, carboxylic acids) were derivatized O-(2,3,4,5,6-Pentafluorobenzyl)-hydroxylamine (PFBHA) N-trimethylsilyl-N-methyl trifluoroacetamide (MSTFA). We designed permeation source addition internal standards improve method reproducibility. joint setup tested validated radical-induced toluene, one most abundant aromatic hydrocarbons atmosphere. For characterization, first derived photolysis rates several typical toluene BATCH (1.77×10−8 3.02×10−4 s−1). Additionally, wall loss determined empirically (4.54×10−6 8.53×10−5 s−1), then parameterized according fundamental molecular properties. cresols benzyl alcohol, compiled weighted calibration factor PTR-ToF-MS, taking into account isomer-specific sensitivities relative distribution SPME-GC-MS. improved instrumental agreement 15 %, whereas PTR-ToF-MS overestimated sum isomers 25 % compared concentrations when using averaged factor. Thus, combined data set offered insight both temporal trends isomeric composition. Finally, conducted six evaluate ring-retaining generation Based on loss-corrected concentrations, formation yields o-cresol (8.0±1.8 %), m-cresol (0.4±0.1 p-cresol (2.4±0.6 alcohol (0.5±0.1 benzaldehyde (4.6±1.7 %) NOx-free at T = 298±1 K. These are consistent previous studies therefore serve proof-of-concept our applied methods.
Language: Английский
Citations
0