The crucial role of heavy metals on the interaction of engineered nanoparticles with polystyrene microplastics

Ho, Wai-Kit; Leung, Kelvin Sze-Yin

doi:10.1016/j.watres.2021.117317

Cited by 39 publications

(16 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Weathering affected Cr uptake by MP–Cr and MP–Cr–UV filter systems differently. In the absence of a UV filter, the q e value of Cr in UVPS–Cr was 2.6 times higher than that of NPS–Cr (Table S6), an observation consistent with the findings of Mao et al and our previous work. , Specifically, multiple studies have confirmed that UV irradiation initiated the formation of oxygen functionalities on MP surfaces, thereby increasing the surface charge negativities, hydrophilicities, and polarities of these particles. Such alterations apparently favored the interactions of MPs with metal cations presumably due to greater electrostatic attraction and surface complexation. , In contrast, the sorption enhancement of MP-bound Cr as induced by the coexisting UV filter was slightly diminished after UV irradiation, as reflected in the greater differences between the q e values of Cr in NPS–Cr and NPS–Cr–UV filter systems (Table S6).…”

Section: Resultssupporting

confidence: 91%

“…In the absence of a UV filter, the q e value of Cr in UVPS−Cr was 2.6 times higher than that of NPS−Cr (Table S6), an observation consistent with the findings of Mao et al and our previous work. 10,15 Specifically, multiple studies have confirmed that UV irradiation initiated the formation of oxygen functionalities on MP surfaces, thereby increasing the surface charge negativities, hydrophilicities, and polarities of these particles. Such alterations apparently favored the interactions of MPs with metal cations presumably due to greater electrostatic attraction and surface complexation.…”

Section: Sorption Of Cr By Psmps As Affected By Bp-typementioning

confidence: 99%

See 1 more Smart Citation

Sorption Behavior, Speciation, and Toxicity of Microplastic-Bound Chromium in Multisolute Systems

Law

et al. 2022

Environ. Sci. Technol. Lett.

Self Cite

View full text Add to dashboard Cite

The unexpectedly high affinity of microplastics (MPs) for heavy metals has attracted increasing attention in recent years. However, there is a scarcity of information on the effects of coexisting constituents on plastic–metal interactions, especially in terms of metal speciation. This study aimed to explore the role of benzophenone-type UV filters on the sorption, oxidation state, and toxicity of chromium (Cr) by pristine and UV-irradiated polystyrene MPs (PSMPs). Results showed that Cr uptake by PSMPs was remarkably higher when UV filters were present. This enhanced affinity was attributed to the formation of Cr–UV filter complexes together with multilayer sorption on PSMPs’ surfaces. Subsequent chemical state measurements indicated alteration of the oxidation state of MP-bound metals as a higher Cr(VI) abundance was identified on the PSMPs with coexisting UV filters. More importantly, our toxicity assessments found that PSMP-bound Cr with a higher oxidation state displayed more severely inhibited microalgae growth. It is noteworthy that toxicological effects of Cr–UV filter complexes were observed only with PSMPs, which thus reaffirms the unique role of MPs in accumulating and transforming contaminants in natural environments. Overall, this study provides the first evidence into the effects of coexisting constituents on the oxidation states and toxicities of MP-bound heavy metals.

show abstract

Section: Resultssupporting

confidence: 91%

Section: Sorption Of Cr By Psmps As Affected By Bp-typementioning

confidence: 99%

Sorption Behavior, Speciation, and Toxicity of Microplastic-Bound Chromium in Multisolute Systems

Law

et al. 2022

Environ. Sci. Technol. Lett.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The concentrations of individual chemical species in PL are challenging to quantify as these compounds are often present in trace amounts, at times lower than analytical detection limits, except for a few additives that are added in high amounts and leach in quantifiable concentrations. ,,, Responsible manufacturing, regulation of additive usage, additive profiling and labeling by manufacturers, and increasing awareness on the generation of PL represent promising directions for policy advices and mitigation measures. In the case of PL, environmental concentrations are a few orders of magnitude lower than most dosages used in experimental studies. However, the mixtures of chemicals and other stressors in the environment cause cumulative toxicity, as the combined toxicity is usually higher than just the sum of toxicity of the individual components, and every chemical will interact synergistically or antagonistically and thus affect overall toxicity. , Further, the laboratory-scale experiments employing single species toxicity or communities in laboratory-controlled environments are vastly different from the much more complex environmental conditions. MP and PL concentrations in natural environments, although low, are increasing on a yearly basis and will even increase faster in the post-COVID era than previously predicted .…”

Section: Research Needs and Future Directionsmentioning

confidence: 99%

Gross Negligence: Impacts of Microplastics and Plastic Leachates on Phytoplankton Community and Ecosystem Dynamics

Amaneesh

Balan

Silpa

et al. 2022

Environ. Sci. Technol.

View full text Add to dashboard Cite

Plastic debris is an established environmental menace affecting aquatic systems globally. Recently, microplastics (MP) and plastic leachates (PL) have been detected in vital human organs, the vascular system, and in vitro animal studies positing severe health hazards. MP and PL have been found in every conceivable aquatic ecosystem�from open oceans and deep sea floors to supposedly pristine glacier lakes and snow covered mountain catchment sites. Many studies have documented the MP and PL impacts on a variety of aquatic organisms, whereby some exclusively focus on aquatic microorganisms. Yet, the specific MP and PL impacts on primary producers have not been systematically analyzed. Therefore, this review focuses on the threats posed by MP, PL, and associated chemicals on phytoplankton, their comprehensive impacts at organismal, community, and ecosystem scales, and their endogenous amelioration. Studies on MP-and PL-impacted individual phytoplankton species reveal the production of reactive oxygen species, lipid peroxidation, physical damage of thylakoids, and other physiological and metabolic changes, followed by homo-and heteroaggregations, ultimately eventuating in decreased photosynthesis and primary productivity. Likewise, analyses of the microbial community in the plastisphere show a radically different profile compared to the surrounding planktonic diversity. The plastisphere also enriches multidrug-resistant bacteria, cyanotoxins, and pollutants, accelerating microbial succession, changing the microbiome, and thus, affecting phytoplankton diversity and evolution. These impacts on cellular and community scales manifest in changed ecosystem dynamics with widespread bottom-up and top-down effects on aquatic biodiversity and food web interactions. These adverse effects�through altered nutrient cycling�have "knock-on" impacts on biogeochemical cycles and greenhouse gases. Consequently, these impacts affect provisioning and regulating ecosystem services. Our citation network analyses (CNA) further demonstrate dire effects of MP and PL on all trophic levels, thereby unsettling ecosystem stability and services. CNA points to several emerging nodes indicating combined toxicity of MP, PL, and their associated hazards on phytoplankton. Taken together, our study shows that ecotoxicity of plastic particles and their leachates have placed primary producers and some aquatic ecosystems in peril.

show abstract

“…The results were different under different influencing factors. For example, microplastics, heavy metals, and pollutants may form complexes, which exhibited different properties under the influence of atomic valence, atomic size, surface texture [46], and functional groups [47]. Of course, the adsorption effect was different for different adsorbents.…”

Section: Factors Affecting the Adsorption Of Microplasticsmentioning

confidence: 99%

Adsorption of Different Pollutants by Using Microplastic with Different Influencing Factors and Mechanisms in Wastewater: A Review

et al. 2022

View full text Add to dashboard Cite

The studies on microplastics are significant in the world. According to the literature, microplastics have greatly specific surface areas, indicating high adsorption capacities for highly toxic pollutants in aquatic and soil environments, and these could be used as adsorbents. The influencing factors of microplastic adsorption, classification of microplastics, and adsorption mechanisms using microplastics for adsorbing organic, inorganic, and mixed pollutants are summarized in the paper. Furthermore, the influence of pH, temperature, functional groups, aging, and other factors related to the adsorption performances of plastics are discussed in detail. We found that microplastics have greater advantages in efficient adsorption performance and cost-effectiveness. In this paper, the adsorptions of pollutants by microplastics and their performance is proposed, which provides significant guidance for future research in this field.

show abstract

The crucial role of heavy metals on the interaction of engineered nanoparticles with polystyrene microplastics

Cited by 39 publications

References 54 publications

Sorption Behavior, Speciation, and Toxicity of Microplastic-Bound Chromium in Multisolute Systems

Sorption Behavior, Speciation, and Toxicity of Microplastic-Bound Chromium in Multisolute Systems

Gross Negligence: Impacts of Microplastics and Plastic Leachates on Phytoplankton Community and Ecosystem Dynamics

Adsorption of Different Pollutants by Using Microplastic with Different Influencing Factors and Mechanisms in Wastewater: A Review

Contact Info

Product

Resources

About