Formation of Environmentally Persistent Free Radicals on Microplastics under Light Irradiation

Environmental Science & Technology, Год журнала: 2019, Номер 53(14), С. 8177 - 8186

Опубликована: Июнь 17, 2019

Microplastics (MPs) are presumed to be inert during aging under ambient conditions. In this study, four types of virgin MPs, including polystyrene (PS), phenol-formaldehyde resin (PF), polyethylene (PE), and polyvinyl chloride (PVC), were aged simulated solar light irradiation. Surprisingly, several environmentally persistent free radicals (EPFRs), which considered a type emerging contaminant, detected on the irradiated PS PF, rather than PE PVC, by electron paramagnetic resonance (EPR) spectroscopy. Depending photoaging duration time, characteristic g-factors EPFRs produced PF 2.0044-2.0049 2.0043-2.0044, respectively. The generated decayed rapidly at initial stage then slowly disappeared with elapsed time. Analyses attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron (XPS), nuclear magnetic (NMR), gel permeation chromatography (GPC) suggested that MPs might experience chemical chain scission, O2/H2O addition, EPFR formation Accompanying EPFRs, reactive oxygen species, such as O2•- •OH, also observed. findings provide novel insight evaluate potential hazards organisms ecosystems.

Язык: Английский

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Biodegradation of polyethylene microplastic particles by the fungus Aspergillus flavus from the guts of wax moth Galleria mellonella

The Science of The Total Environment, Год журнала: 2019, Номер 704, С. 135931 - 135931

Опубликована: Дек. 5, 2019

Язык: Английский

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Current technologies for plastic waste treatment: A review

Journal of Cleaner Production, Год журнала: 2020, Номер 282, С. 124523 - 124523

Опубликована: Окт. 27, 2020

Язык: Английский

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Marine Microbial Assemblages on Microplastics: Diversity, Adaptation, and Role in Degradation

Annual Review of Marine Science, Год журнала: 2019, Номер 12(1), С. 209 - 232

Опубликована: Июнь 21, 2019

We have known for more than 45 years that microplastics in the ocean are carriers of microbially dominated assemblages. However, only recently has role microbial interactions with marine ecosystems been investigated detail. Research this field focused on three main areas: (a) establishment plastic-specific biofilms (the so-called plastisphere); (b) enrichment pathogenic bacteria, particularly members genus Vibrio, coupled to a vector function microplastics; and (c) degradation environment. Nevertheless, relationships between microorganisms remain unclear. In review, we deduce from current literature, new comparative analyses, considerations adaptation concerning plastic microplastic particles should rather limited effects ecosystems. The majority growing seem belong opportunistic colonists do not distinguish natural artificial surfaces. Thus, pose higher risk life forms by potentially harboring bacteria. On other hand, represent recalcitrant substances insufficient support prokaryotic metabolism will probably be degraded any period time relevant human society. Because cannot remove ocean, proactive action regarding research alternatives strategies prevent entering environment taken promptly.

Язык: Английский

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Investigation on the adsorption and desorption behaviors of antibiotics by degradable MPs with or without UV ageing process

Journal of Hazardous Materials, Год журнала: 2020, Номер 401, С. 123363 - 123363

Опубликована: Июль 2, 2020

Язык: Английский

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Suspended fine particulate matter (PM2.5), microplastics (MPs), and polycyclic aromatic hydrocarbons (PAHs) in air: Their possible relationships and health implications

Environmental Research, Год журнала: 2020, Номер 192, С. 110339 - 110339

Опубликована: Окт. 14, 2020

Язык: Английский

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Understanding and Improving Microplastic Removal during Water Treatment: Impact of Coagulation and Flocculation

Environmental Science & Technology, Год журнала: 2020, Номер 54(14), С. 8719 - 8727

Опубликована: Июнь 16, 2020

The efficacy of plastic particle removal by municipal water treatment plants is currently uncertain, and the mechanisms involved in microplastic (MP) coagulation flocculation have only been superficially investigated. pristine versus weathered debris impact size on remain largely unexplored. In this study, coagulation, flocculation, settling performances were investigated using MPs (polyethylene (PE) polystyrene (PS) microspheres, polyester (PEST) fibers). Weathering processes that changed surface chemistry roughness impacted MP affinity for coagulants flocculants. A quartz crystal microbalance with dissipation monitoring was used to identify during flocculation. Measured deposition rates confirmed relatively low between surfaces aluminum-based compared cationic polyacrylamide (PAM). every case examined, coagulant efficiency increased when weathered. Removals 97 99% measured PEST PE, respectively. Larger PE most resistant 82% observed even under enhanced conditions. By understanding interaction mechanisms, optimized. Finally, study explored use settled turbidity as a possible indicator removal.

Язык: Английский

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Characteristics of Plastic Pollution in the Environment: A Review

Bulletin of Environmental Contamination and Toxicology, Год журнала: 2020, Номер 107(4), С. 577 - 584

Опубликована: Март 12, 2020

Язык: Английский

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Distribution of microplastics in soil and freshwater environments: Global analysis and framework for transport modeling

Environmental Pollution, Год журнала: 2021, Номер 274, С. 116552 - 116552

Опубликована: Янв. 23, 2021

Язык: Английский

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Disposable masks release microplastics to the aqueous environment with exacerbation by natural weathering

Journal of Hazardous Materials, Год журнала: 2021, Номер 417, С. 126036 - 126036

Опубликована: Май 8, 2021

Язык: Английский

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