Surfactant changes lead adsorption behaviors and mechanisms on microplastics

Shen, Maocai; Song, Biao; Zeng, Guangming; Zhang, Yaxin; Teng, Fengyun; Zhou, Chengyun

doi:10.1016/j.cej.2020.126989

Cited by 172 publications

(36 citation statements)

References 41 publications

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“…These results revealed that the interactions between heavy metals and PVC microplastics were relatively fast, which was possibly because the heavy metals were mainly adsorbed on the outer surfaces of the microplastic particles (Gao et al 2019 ) and the even and chemically clean surfaces of virgin microplastics (Liao et al 2020). Similarly, many other studies also noted that adsorption of heavy metals (e.g., Cd(II) and Pb(II)) by microplastics reached equilibrium within 24 h (Lang et al 2020 ; Liao et al 2020; Tang et al 2020 ; Shen et al 2021 ). In addition, the maximum capacity for adsorption of Pb (1.869 μg·g −1 ) on PVC microplastics was significantly higher than those of the other three heavy metals (Cr (1.184 μg·g −1 ), Cd (1.117 μg·g −1 ), and As (0.833 μg·g −1 )) ( t test, p < 0.05).…”

Section: Resultsmentioning

confidence: 72%

Bioaccessibility of microplastic-associated heavy metals using an in vitro digestion model and its implications for human health risk assessment

Chen

et al. 2022

Environ Sci Pollut Res

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Microplastics can act as carriers of heavy metals and may enter humans through ingestion and threaten human health. However, the bioaccessibility of heavy metals associated with microplastics and its implications for human health risk assessments are poorly understood. Therefore, in this study, four typical heavy metals (As(V), Cr(VI), Cd(II), and Pb(II)) and one typical microplastic (polyvinyl chloride, PVC) were chosen to estimate the human health risk of microplastic-associated heavy metals by incorporating bioaccessibility. Significant adsorption of heavy metals was observed with the following order for adsorption capacity: Pb(II) > Cr(VI) > Cd(II) > As(V); the efficiencies for desorption of these four heavy metals from PVC microplastics were all below 10%. The Fourier transform infrared spectroscopy results indicated that the functional groups on the surface of the virgin PVC microplastics did not play an important role in the capture process. Heavy metals in both gastric and small intestinal phases were prone to release from PVC microplastics when bioaccessibility was evaluated with the in vitro SBRC (Soluble Bioavailability Research Consortium) digestion model. In addition, Pb(II) bioaccessibility in the gastric phase was significantly higher than those in the other phases, while As(V), Cr(VI), and Cd(II) bioaccessibilities showed the opposite trend. After incorporating bioaccessibility adjustments, the noncarcinogenic hazards and carcinogenic risks determined were lower than those based on total metal contents. The individual hazard quotients (HQ) and carcinogenic risks (CR) for ingestion of these four heavy metals from PVC microplastics were all lower than the threshold values for adults and children. In summary, this study will provide a new view of the human health risks of heavy metals associated with microplastics. Supplementary Information The online version contains supplementary material available at 10.1007/s11356-022-20983-8.

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Section: Resultsmentioning

confidence: 72%

Bioaccessibility of microplastic-associated heavy metals using an in vitro digestion model and its implications for human health risk assessment

Chen

et al. 2022

Environ Sci Pollut Res

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“…The isothermal adsorption curves reveal the equilibrium state of adsorbate in solution and adsorbent, and further illustrate the adsorption mechanism (Shen et al 2021). Fig.…”

Section: Adsorption Isotherms Of Pb 2+ Onto Psmps In the Presence And Absence Of Hamentioning

confidence: 80%

Humic Acid Promotes the Adsorption of Lead onto PSMPs: Site Energy Distribution Theory and Fluorescence Quenching Analysis

Feng

Wei

et al. 2021

Preprint

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Microplastics (MPs) have a great potential to adsorb heavy metal pollutants such as Pb2+ and the dissolved organic matter(DOM) in the aquatic environment will affect this adsorption behavior. In this study, batch experiments were performed to investigate the adsorption characteristics of Pb2+ onto polystyrene microplastics (PSMPs) in the presence and absence of HA(a kind of representative DOM). The adsorption kinetics of Pb2+ onto PSMPs conformed to the pseudo-second order model, and the adsorption isotherms were well fitted by the Langmuir model. With the increase of HA concentration, the Pb2+ adsorption onto PSMPs increased. Site energy distribution analysis showed that the presence of HA increased the adsorption site energy of PSMPs, thus enhancing the adsorption capacity for Pb2+. The fluorescence quenching analysis of HA further indicated that part of HA were adsorbed onto PSMPs, which increased additional binding sites on the surface of PSMPs. This was attributed to the abundant functional groups that could react with Pb2+ of HA. The pH and ionic strength of solution changed the structure of HA and the adsorption sites of PSMPs, which influenced the adsorption capacity of PSMPs for Pb2+. This study illustrated the effect of HA on the process and mechanism of Pb2+ adsorption onto PSMPs, and provided more information for the evaluation of environmental behavior and toxicological effects of microplastics in aquatic environments.

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“…MPs can also act as an indicator for various toxic contaminants in marine environments, such as metal ions [21,22]. Relevant studies investigated the adsorption characteristics of metal ions on MPs [23,24], whereas the desorption behavior of metal ions from MPs at different marine environments is largely unknown [25]. MPs can also function as indicators for metals, antibiotics, toxic chemicals, pathogenic bacteria Harmful Algal Bloom (HAB)forming dinoflagellates across the continents, especially through ballast water, serving as "hotspots" in ballast waters for developing and spreading multiple drug-resistant human pathogens through co-selection mechanisms [26].…”

Section: Microplastics In Marine Environmentsmentioning

confidence: 99%

Investigating the Human Impacts and the Environmental Consequences of Microplastics Disposal into Water Resources

Kyriakopoulos

Kapsalis

2022

Sustainability

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During the last decades, one of the most contentious environmental issues has been the investigation of the fate of microplastics (MPs) and detrimental consequences in natural and water resources worldwide. In this respect, it is critical research firstly to track the ways in which MPs are determined as key anthropogenic pollutants in terms of ecological risk and secondly to plan feasible policies under which the role of science and society in tackling this global issue in the future should be prioritized. In this study, a systematic theoretical, technical, and planning analysis was developed in alignment with a Scopus search deployed in the second half of the year 2021 and covering a wide chronological range (from 1970s onwards) and thematic contexts of analysis by using keywords and key phrases organized into two groups. The document results were graphically represented, revealing the main scientific focus of studies. Subsequently, our study investigated the quantitative assessment methods of MPs in marine environments, denoting the range of standard procedures applied for collecting and analyzing samples of water, bottom sediments, and coastal deposits. The technological part of the study includes the presentation of the relevant analytical techniques applied for MPs tracking and monitoring in water resources, determining the wide spectrum of plastic compounds traced. Of particular interest was the determination of environmental depletion and human implications caused, even by extremely low concentrations of MPs, for marine biota, posing potential risks to marine ecosystems, biodiversity, and food availability. Finally, the research proposed the challenges of actions needed to support scientific, industry, policy, and civil society communities to curb the ongoing flow of MPs and the toxic chemicals they contain into water resources, while rethinking the ways of plastics consumption by humanity.

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Surfactant changes lead adsorption behaviors and mechanisms on microplastics

Cited by 172 publications

References 41 publications

Bioaccessibility of microplastic-associated heavy metals using an in vitro digestion model and its implications for human health risk assessment

Bioaccessibility of microplastic-associated heavy metals using an in vitro digestion model and its implications for human health risk assessment

Humic Acid Promotes the Adsorption of Lead onto PSMPs: Site Energy Distribution Theory and Fluorescence Quenching Analysis

Investigating the Human Impacts and the Environmental Consequences of Microplastics Disposal into Water Resources

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