Distribution and regeneration of hydroxyl free radicals in gaseous and particulate phases of pollutants in near-ground ambient air

Wang, Guoying; Yu, Jianglei; Su, Ying; Shi, Gaofeng

doi:10.1016/j.scitotenv.2019.05.300

Cited by 6 publications

(3 citation statements)

References 27 publications

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“…The sampling site is situated at the Xigu industrial area (36.1028 °N, 103.6341 °E). The experimental details also refer to refs and . The particulate matter filter samples were collected from 1st January to December of 2018.…”

Section: Methodsmentioning

confidence: 99%

Barrierless HONO and HOS(O)2-NO₂ Formation via NH₃-Promoted Oxidation of SO₂ by NO₂

Wang

Niu

et al. 2021

J. Phys. Chem. A

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In the troposphere, the knowledge about nitrous acid (HONO) sources is incomplete. The missing source of sulfate and fine particles cannot be explained during haze events. Air quality models cannot predict high levels of secondary fine-particle pollution. Despite extensive studies, one challenging issue in atmospheric chemistry is identifying the source of HONO. Here, we present direct ab initio molecular dynamics simulation evidence and typical air pollution events of the formation of gaseous HONO, nitrogen dioxide/hydrogen sulfite (HOS(O)2-NO2 or NO2-HSO3) from nitrogen dioxide (NO2), sulfur dioxide (SO2), water (H2O), and ammonia (NH3) molecules in a proportion of 2:1:3:3. The reactions show a new mechanism for the formation of HONO and NO2-HSO3 in the troposphere, especially when the concentration of NO2, SO2, H2O, and NH3 is high (e.g., 2:1:3:3 or higher) in the air. Contrary to the proportion NO2, SO2, H2O, and NH3 equaling to 1:1:3:1 and 1:1:3:2, the proportion (2:1:3:3) enables barrierless reactions and weak interactions between molecules via the formation of HONO, NO2-HSO3, and NH3/H2O. In addition, field observations are carried out, and the measured data are summarized. Correlation analysis supported the conversion of NO2 to HONO during observational studies. The weak interactions promote proton transfer, resulting in the generation of HONO, NO2-HSO3, and NH3/H2O pairs.

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Section: Methodsmentioning

confidence: 99%

Barrierless HONO and HOS(O)2-NO₂ Formation via NH₃-Promoted Oxidation of SO₂ by NO₂

Wang

Niu

et al. 2021

J. Phys. Chem. A

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“…It is worth noting that a large number of literature studies have also shown that the combination of free radicals and nanoparticles can further stabilize free radicals to persist in the environment. [26][27][28] The combination of a redox initiation system with stable persistent free radicals of nanoparticles may pave a new way to solve the problem of rapid preparation of hydrogels without sacricing their mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

In situ rapid synthesis of hydrogels based on a redox initiator and persistent free radicals

Yuan

Wang

et al. 2023

Nanoscale Adv.

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“…Atmospheric pollution result from the release of a damaging chemical or material into the atmosphere and it encompasses a wide variety of pollutants, either organic or inorganic compounds. Once air pollutants are released into the atmosphere, those ones can be exhibited both gaseous phase as solid and liquid particles suspended in the air (particulate material, PM) [7].…”

Section: Introductionmentioning

confidence: 99%

Importance of Air Quality Networks in Controlling Exposure to Air Pollution

Galán-Madruga¹

2021

Environmental Emissions

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An air quality monitoring network (AQMN) is a basic piece of environmental management due to that it satisfies the major role in monitoring of environment emissions, in special relevance to target air pollutants. An adequate installation would lead to support high efficiency of the network. Therefore, AQMN pre-layout should be considered as an essential factor in regarding with the location of fixed measurement stations within AQMN, as the minimum number of sampling points. Nevertheless, once AQMN has been already installed, and given that the spatial air pollutants pattern can vary along time, an assessment of the AQMN design would be addressed in order to identify the presence of potential redundant fixed monitoring stations. This approach would let to improve the AQMN performance, reduce maintenance costs of the network and consolidate the investment on those more efficient fixed stations. The chapter includes aspects relative to air pollutants measured by networks, their representativeness, limitations, importance, and the future needs. It ponders the need of re-assessment of the AQMN layout for assuring (i) a right evaluation of the human being exposure to atmospheric pollutants and controlling the environmental emissions into the atmosphere and (ii) an adequate performance of the network along time.

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Distribution and regeneration of hydroxyl free radicals in gaseous and particulate phases of pollutants in near-ground ambient air

Cited by 6 publications

References 27 publications

Barrierless HONO and HOS(O)2-NO₂ Formation via NH₃-Promoted Oxidation of SO₂ by NO₂

Barrierless HONO and HOS(O)2-NO₂ Formation via NH₃-Promoted Oxidation of SO₂ by NO₂

In situ rapid synthesis of hydrogels based on a redox initiator and persistent free radicals

Importance of Air Quality Networks in Controlling Exposure to Air Pollution

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Distribution and regeneration of hydroxyl free radicals in gaseous and particulate phases of pollutants in near-ground ambient air

Cited by 6 publications

References 27 publications

Barrierless HONO and HOS(O)2-NO2 Formation via NH3-Promoted Oxidation of SO2 by NO2

Barrierless HONO and HOS(O)2-NO2 Formation via NH3-Promoted Oxidation of SO2 by NO2

In situ rapid synthesis of hydrogels based on a redox initiator and persistent free radicals

Importance of Air Quality Networks in Controlling Exposure to Air Pollution

Contact Info

Product

Resources

About

Barrierless HONO and HOS(O)2-NO₂ Formation via NH₃-Promoted Oxidation of SO₂ by NO₂

Barrierless HONO and HOS(O)2-NO₂ Formation via NH₃-Promoted Oxidation of SO₂ by NO₂