Environmental factors-mediated behavior of microplastics and nanoplastics in water: A review

Sharma, Virender K.; Ma, Xingmao; Guo, Binglin; Zhang, Kaiyi

doi:10.1016/j.chemosphere.2021.129597

Cited by 103 publications

(37 citation statements)

References 91 publications

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“…Humic acid and fulvic acid are extensively distributed in natural waters and readily interact with MPs through electrostatic and hydrophobic forces. 31 The critical roles of humic acid and fulvic acid in the MP photoaging process were subsequently explored. The impacts of humic acid and fulvic acid on the photoaging of PP MPs were investigated by comparing the changes observed in melting temperatures and surface zeta potentials after different aging times in ultrapure water, and SRHA-and PLFA-containing solutions [10 mg C/L, based on the TOC value (9.71 mg/L) detected in lake water].…”

Section: Resultsmentioning

confidence: 99%

“…Humic acid and fulvic acid are complex mixtures in natural waters and mainly comprise carbohydrates, protein, thiols, carbonyls, and phenolics. 31 Humic acid and fulvic acid coated on the surfaces of MPs may also physically shield the MPs from irradiation (Figure 6f). From this point of view, chromophores and nonchromophores present in humic acid and fulvic acid competed with PP MPs for light absorption and inhibited the direct photodegradation of plastic polymers in water via a light-shielding effect.…”

Section: Formation Of • Oh and Omentioning

confidence: 99%

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Humic Acid and Fulvic Acid Hinder Long-Term Weathering of Microplastics in Lake Water

Liu

Gong

et al. 2021

Environ. Sci. Technol.

122

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We investigated the photoaging of polypropylene (PP) microplastics (MPs) in lake water. The results showed that photoaging of PP MPs was significantly inhibited in lake water compared with ultrapure water after 12 d of ultraviolet (UV) irradiation, and humic acid and fulvic acid, rather than carbonate (CO3 2–), nitrate (NO3 –), or chloride (Cl–) ions, were identified as the primary contributors to the observed inhibition. Mechanisms for the roles of humic acid (Suwannee River humic acid) and fulvic acid (Pony Lake fulvic acid) in reducing the rates of photodegradation showed that humic acid and fulvic acid acted as both reactive oxygen species (ROS) scavengers (e.g., of •OH) (dominant contribution) and optical light filters. As ROS scavengers, humic acid and fulvic acid significantly decreased the capacity for the formation of •OH and O2 •– by PP MPs under irradiation. In addition, the chromophores in humic acid and fulvic acid competed for photons with MPs through the light-shielding effect, thereby causing less fragmentation of PP particles and changes in other properties (melting temperature, contact angle, and surface zeta potential). The proposed mechanisms for inhibition by humic acid and fulvic acid will aid our efforts to assess the duration of aging and alterations of MP properties during long-term weathering in natural waters.

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Section: Resultsmentioning

confidence: 99%

Section: Formation Of • Oh and Omentioning

confidence: 99%

Humic Acid and Fulvic Acid Hinder Long-Term Weathering of Microplastics in Lake Water

Liu

Gong

et al. 2021

Environ. Sci. Technol.

122

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“…However, recent studies have also shown MNPs permeating freshwater bodies ( Li et al, 2020a ; Dong et al, 2021 ) and various terrestrial environments ( Mohajerani and Karabatak, 2020 ; Tan et al, 2021 ). Furthermore, due to the heterogeneity of MNPs and various inorganic plastic particles as well as organic matter, they have the propensity to form both homo- or hetero-aggregates as highlighted in many studies ( Jakubowicz et al, 2020 ; Sharma et al, 2021 ). The formation of these undesirable aggregates leads to the bioaccumulation and bioamplification phenomena causing detrimental effects to the biotic components in different ecosystems ( da Costa, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Environmental Impacts of Microplastics and Nanoplastics: A Current Overview

et al. 2021

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The increasing distribution of miniaturized plastic particles, viz. microplastics (100 nm–5 mm) and nanoplastics (less than 100 nm), across the various ecosystems is currently a subject of major environmental concern. Exacerbating these concerns is the fact that microplastics and nanoplastics (MNPs) display different properties from their corresponding bulk materials; thus, not much is understood about their full biological and ecological implications. Currently, there is evidence to prove that these miniaturized plastic particles release toxic plastic additives and can adsorb various chemicals, thereby serving as sinks for various poisonous compounds, enhancing their bioavailability, toxicity, and transportation. Furthermore, there is a potential danger for the trophic transfer of MNPs to humans and other higher animals, after being ingested by lower organisms. Thus, this paper critically analyzes our current knowledge with regard to the environmental impacts of MNPs. In this regard, the properties, sources, and damaging effects of MNPs on different habitats, particularly on the biotic components, were elucidated. Similarly, the consequent detrimental effects of these particles on humans as well as the current and future efforts at mitigating these detrimental effects were discussed. Finally, the self-cleaning efforts of the planet via a range of saprophytic organisms on these synthetic particles were also highlighted.

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“…[2] Nevertheless, the microplastics and nanoplastics generated in the environment by mechanical abrasion, biodegradation, hydrolysis, and thermal or light irradiation involve an increasing global concern due to their risk to human health and ecological systems. [3] In 2015, the European Commission established an action plan based on a circular economy, which pursues a transformation from the old linear model to the circular model in which the waste is reintroduced into the production cycle, thereby minimizing the amount of waste generated. [4] Although general guidelines for plastics recycling had already been proposed in this first global plan, the European Commission established a specific strategic plan for plastics in another report on circular economy in 2018, in which guidelines were given for producing, using, and recycling plastics.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Conversion of HDPE into Value Products by Fast Pyrolysis Using FCC Spent Catalysts in a Fountain Confined Conical Spouted Bed Reactor

et al. 2021

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Continuous catalytic cracking of polyethylene over a spent fluid catalytic cracking (FCC) catalyst was studied in a conical spouted bed reactor (CSBR) with fountain confiner and draft tube. The effect of temperature (475-600°C) and space-time (7-45 g cat min g HDPE À 1) on product distribution was analyzed. The CSBR allows operating with continuous plastic feed without defluidization problems and is especially suitable for catalytic pyrolysis with high catalyst efficiency. Thus, high catalyst activity was observed, with waxes yield being negligible above 550°C. The main product fraction obtained in the catalytic cracking was made up of C 5 À C 11 hydrocarbons, with olefins being the main components. However, its yield decreased as temperature and residence time were increased, which was due to reactions involving cracking, hydrogen transfer, cyclization, and aromatization, leading to light hydrocarbons, paraffins, and aromatics. The proposed strategy is of great environmental relevance, as plastics are recycled using an industrial waste (spent FCC catalyst).

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Environmental factors-mediated behavior of microplastics and nanoplastics in water: A review

Cited by 103 publications

References 91 publications

Humic Acid and Fulvic Acid Hinder Long-Term Weathering of Microplastics in Lake Water

Humic Acid and Fulvic Acid Hinder Long-Term Weathering of Microplastics in Lake Water

Environmental Impacts of Microplastics and Nanoplastics: A Current Overview

Conversion of HDPE into Value Products by Fast Pyrolysis Using FCC Spent Catalysts in a Fountain Confined Conical Spouted Bed Reactor

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