Particle-size distributions of environmentally persistent free radicals and oxidative potential of soils from a former gasworks site

Ni, Zheng; Gao, Ning; Chen, Na; Zhang, Chi; Liu, Ze; Zhu, Kaigui; Sharma, Virender K.; Jia, Hanzhong

doi:10.1016/j.scitotenv.2023.161747

Cited by 9 publications

(3 citation statements)

References 46 publications

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“…As seen in Figure S11A, the increase in the EPR signal indicated that secondary EPFRs were generated due to excitation of the V-TWPs/Bio-TWPs by simulated sunlight irradiation, particularly in V-TWPs. To further affirm this interpretation, EPR analysis on filtrate from two different TWPs induced TC photodegradation was revealed that the capacity of V-TWPs to generate • OH was higher than that of Bio-TWPs during irradiation (Figure A), and O 2 •– radical was also produced by different TWPs (Figure B) . However, the characteristic signal of 1 O 2 was nearly undetectable, indicating that 1 O 2 was not a major contributor to TC photodegradation (Figure S11B).…”

Section: Discussionmentioning

confidence: 84%

“…•− radical was also produced by different TWPs (Figure 6B). 51 However, the characteristic signal of 1 O 2 was nearly undetectable, indicating that 1 O 2 was not a major contributor to TC photodegradation (Figure S11B). Consequently, it could be preliminarily concluded that the promotion of TC photodegradation under light conditions could be attributed to ROS produced by photoaging of TWPs.…”

Section: ■ Materials and Methodsmentioning

confidence: 98%

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Biofilm-Colonized versus Virgin Black Microplastics to Accelerate the Photodegradation of Tetracycline in Aquatic Environments: Analysis of Underneath Mechanisms

Ding

Ouyang

Zhang

et al. 2023

Environ. Sci. Technol.

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Tire wear particles (TWPs) exposed to the aquatic environment are rapidly colonized by microorganisms and provide unique substrates for biofilm formation, which potentially serve as vectors for tetracycline (TC) to influence their behaviors and potential risks. To date, the photodegradation capacity of TWPs on contaminants due to biofilm formation has not been quantified. To accomplish this, we examined the ability of virgin TWPs (V-TWPs) and biofilm-developed TWPs (Bio-TWPs) to photodegrade TC when exposed to simulated sunlight irradiation. V-TWPs and Bio-TWPs accelerated the photodegradation of TC, with rates (k obs) of 0.0232 ± 0.0014 and 0.0152 ± 0.0010 h–1, respectively (k obs increased by 2.5–3.7 times compared to that for only TC solution). An important factor of increased TC photodegradation behavior was identified and linked to the changed reactive oxygen species (ROS) of different TWPs. The V-TWPs were exposed to light for 48 h, resulting in more ROS for attacking TC, with hydroxyl radicals (•OH) and superoxide anions (O2 •–) playing a dominant role in TC photodegradation measured using scavenger/probe chemicals. This was primarily due to the greater photosensitization effects and higher electron-transfer capacity of V-TWPs in comparison to Bio-TWPs. In addition, this study first sheds light on the unique effect and intrinsic mechanism of the crucial role of Bio-TWPs in TC photodegradation, enhancing our holistic understanding of the environmental behavior of TWPs and the associated contaminants.

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Section: Discussionmentioning

confidence: 84%

Section: ■ Materials and Methodsmentioning

confidence: 98%

Biofilm-Colonized versus Virgin Black Microplastics to Accelerate the Photodegradation of Tetracycline in Aquatic Environments: Analysis of Underneath Mechanisms

Ding

Ouyang

Zhang

et al. 2023

Environ. Sci. Technol.

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“…Regarding soil dust, recent studies indicate that PAHs readily adsorb on mineral surfaces, likely forming "cation-π" interactions with active sites. This interaction promotes electron transfer from aromatic compounds to surface cations on clay surfaces, 245 facilitating the formation of intermediate radicals/final products (Zhao et al, 2019a;Ni et al, 2023).…”

Section: Sources Of Epfrsmentioning

confidence: 99%

Atmospheric evolution of environmentally persistent free radicals in rural North China Plain: insights into water solubility and effects on PM_2.5 oxidative potential

Yang,

Liu,

Yang

et al. 2024

Preprint

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Abstract. Environmentally Persistent Free Radicals (EPFRs) represent a novel class of hazardous substances, posing risks to human health and the environment. In this study, we investigated the EPFRs in ambient fine, coarse, and total suspended particulate matter (PM2.5, PM10, TSP) in rural North China Plain, where local primary emissions of EPFRs were limited. We observed that the majority of EPFRs occurred in PM2.5. Moreover, distinct seasonal patterns and higher g-factors of EPFRs were found compared to those in urban environments, suggesting unique characteristics of EPFRs in rural areas. The source apportionment analyses revealed atmospheric oxidation as the largest contributor (33.6 %) to EPFRs. A large water-soluble fraction (35.2 %) of EPFRs was determined, potentially resulting from the formation of more oxidized EPFRs through atmospheric oxidation processes during long-range/regional transport. Additionally, significant positive correlations were observed between EPFRs and the oxidative potential of water-soluble PM2.5 measured by dithiothreitol-depletion and hydroxyl-generation assays, likely attributable to the water-soluble fractions of EPFRs. Overall, our findings reveal the prevalence of water-soluble EPFRs in rural areas and underscore atmospheric oxidation processes can modify their properties, such as increasing their water solubility. This evolution may alter their roles in contributing to the oxidative potential of PM2.5 and potentially also influence their impact on climate-related cloud chemistry.

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A short review on environmental distribution and toxicity of the environmentally persistent free radicals

Yi,

Lin,

et al. 2023

Chemosphere

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Particle-size distributions of environmentally persistent free radicals and oxidative potential of soils from a former gasworks site

Cited by 9 publications

References 46 publications

Biofilm-Colonized versus Virgin Black Microplastics to Accelerate the Photodegradation of Tetracycline in Aquatic Environments: Analysis of Underneath Mechanisms

Biofilm-Colonized versus Virgin Black Microplastics to Accelerate the Photodegradation of Tetracycline in Aquatic Environments: Analysis of Underneath Mechanisms

Atmospheric evolution of environmentally persistent free radicals in rural North China Plain: insights into water solubility and effects on PM_2.5 oxidative potential

A short review on environmental distribution and toxicity of the environmentally persistent free radicals

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Particle-size distributions of environmentally persistent free radicals and oxidative potential of soils from a former gasworks site

Cited by 9 publications

References 46 publications

Biofilm-Colonized versus Virgin Black Microplastics to Accelerate the Photodegradation of Tetracycline in Aquatic Environments: Analysis of Underneath Mechanisms

Biofilm-Colonized versus Virgin Black Microplastics to Accelerate the Photodegradation of Tetracycline in Aquatic Environments: Analysis of Underneath Mechanisms

Atmospheric evolution of environmentally persistent free radicals in rural North China Plain: insights into water solubility and effects on PM2.5 oxidative potential

A short review on environmental distribution and toxicity of the environmentally persistent free radicals

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Product

Resources

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Atmospheric evolution of environmentally persistent free radicals in rural North China Plain: insights into water solubility and effects on PM_2.5 oxidative potential