The oxidative potential of fresh and aged elemental carbon-containing airborne particles: a review

Abstract

Elemental carbon is often found in ambient particulate matter (PM), and it contributes to PM's oxidative potential (OP) and thus poses great health concerns. Previous review articles mainly focused on...

Significantly Accelerated Photosensitized Formation of Atmospheric Sulfate at the Air–Water Interface of Microdroplets

“…83,84 Besides, it shows great significance in regulating the oxidative potential of atmospherically relevant carbon matter. 85,86 In our early study, we revealed the important role of redox-active organics containing quinone functional groups in triggering fast SO 2 oxidation mediated by the photosensitized reaction using model compounds. 68 The reaction mechanism of the multiphase photosensitized SO 2 oxidation where HULIS molecules are involved is described in Figure 2e.…”

Sulfate Formation by Photosensitization in Mixed Incense Burning–Sodium Chloride Particles: Effects of RH, Light Intensity, and Aerosol Aging

“…We hypothesize that the enhanced sulfate formation in aged particles may be related to the large amounts of secondary oxidants, possibly reactive oxygen species (ROS), formed under light and air, as no sulfate can be found in aged IS–NaCl under dark conditions. ROS are highly reactive in the atmosphere; they include free radicals (e.g., OH • , HO 2 • , and RO 2 • ), ions (e.g., O 2 – , ClO – , and ONOO – ), and peroxides (e.g., ROOH and ROOR’).…”

Unveiling the Role of Carbonate Radical Anions in Dust‐Driven SO2 Oxidation

“…For example, black carbon and soot particles produce active intermediates (Y. Y. Liu & Chan, 2022;Zhu et al, 2020), which may interact with 𝐴𝐴 CO3 .− and have some impact on the reaction mechanism considered here. Additionally, atmospheric NO x (NO + NO 2 ) is one of the pollutant gases that are prone to be involved in the dust-driven SO 2 oxidation process (He et al, 2014;Qu et al, 2016).…”

“…should be considered in future work in a better understanding of the effect of carbonate radical ions on SO 2 oxidation. For example, black carbon and soot particles produce active intermediates (Y. Y. Liu & Chan, 2022; P. Zhang et al., 2022; Zhu et al., 2020), which may interact with $${\mathrm{C}{\mathrm{O}}_{3}}^{.-}$$ and have some impact on the reaction mechanism considered here. Additionally, atmospheric NO x (NO + NO 2 ) is one of the pollutant gases that are prone to be involved in the dust‐driven SO 2 oxidation process (He et al., 2014; Qu et al., 2016).…”