Aggregation kinetics of UV irradiated nanoplastics in aquatic environments

Liu, Yanjun; Hu, Yiben; Yang, Chen; Chen, Chengyu; Huang, Weilin; Dang, Zhi

doi:10.1016/j.watres.2019.114870

Cited by 151 publications

(108 citation statements)

References 57 publications

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“…The critical coagulation concentration (CCC) values of MPs can be obtained from α. For instance, the CCC values of PS NPs were around 300 mM to 450 mM in monovalent electrolytes (e.g., NaCl and KCl) and around 30 mM in divalent electrolytes (e.g., CaCl2 and BaCl2) (Liu et al, 2019b;Yu et al, 2019). While for micro-sized PS MPs, CCC value was smaller compared to PS NPs, such as around 15 mM in NaCl, KNO3, NaNO3, and around 3 mM in CaCl2 and BaCl2 (Li et al, 2018).…”

Section: Light-scattering Methodsmentioning

confidence: 97%

“…DLVO theory could also be employed to quantify the aggregation kinetics of MPs and estimate their Hamaker constants (Romero-Cano et al, 2001). For example, the Hamaker constants of PS NPs at different aging status derived from DLVO theory were found to decrease from 3.5 to 1.5×10 -18 mJ after 3-day of UV irradiation (Liu et al, 2019b).…”

Section: Derjaguin-landau-verwey-overbeek (Dlvo) Theorymentioning

confidence: 99%

“…Nonionic surfactants rarely shifted the surface charges of particle, but provided steric hindrance force to stabilize particles. ( Liu et al, 2019b) Other factors Phytoplankton, microorganisms (e.g., bacteria and algae), and inorganic colloids (e.g., clay, suspended sediments and Fe2O3) easily adhere to the surfaces of plastic particles and form heteroaggregates. EPS and the size of suspended sediment play an important role in the heteroaggregation processes of MPs.…”

Section: Surfactantmentioning

confidence: 99%

“…Solar irradiation, especially the UVA fraction of sunlight, was found to change the physicochemical properties (surface polarity and functional groups) of NPs and alter their aggregation behavior in water (Liu et al, 2019b). The stability of PS NPs was improved in NaCl solution but decreased in CaCl2 solution after exposure to UV light.…”

Section: Effect Of Lightmentioning

confidence: 99%

“…The stability of PS NPs was improved in NaCl solution but decreased in CaCl2 solution after exposure to UV light. The high stability of PS NPs in NaCl solution was likely because of the following three reasons: (1) lowered van der Waals attraction between aged PS NPs because of their decreased Hamaker constants; (2) increased electrostatic forces due to deprotonation of oxygen-containing functional groups generated on aged PS NPs; and (3) enhanced steric hindrance forces between UV-exposed PS NPs rendered by the leaching organic matter (Liu et al, 2019b). The aggregation of PS NPs was promoted in CaCl2 solution primarily because Ca 2+ could complex with oxygen-containing functional groups such as carbonyl and carboxyl groups, that were formed on UV-irradiated PS NP surfaces (Qu et al, 2010).…”

Section: Effect Of Lightmentioning

confidence: 99%

See 4 more Smart Citations

A review of microplastics aggregation in aquatic environment: Influence factors, analytical methods, and environmental implications

Wang

Bolan

Tsang

et al. 2021

Journal of Hazardous Materials

255

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The aggregation of MPs in real aquatic environment is far from fully understood.  Sampling and analyzing methods for studying MP aggregation were summarized. Influence factors and environmental implications of MP aggregation were reviewed. MP aggregation in the field and their temporal stability deserve extensive research. Laboratory studies should use MPs representing those in real aquatic environment.

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Section: Light-scattering Methodsmentioning

confidence: 97%

Section: Derjaguin-landau-verwey-overbeek (Dlvo) Theorymentioning

confidence: 99%

Section: Surfactantmentioning

confidence: 99%

Section: Effect Of Lightmentioning

confidence: 99%

Section: Effect Of Lightmentioning

confidence: 99%

See 3 more Smart Citations

A review of microplastics aggregation in aquatic environment: Influence factors, analytical methods, and environmental implications

Wang

Bolan

Tsang

et al. 2021

Journal of Hazardous Materials

255

View full text Add to dashboard Cite

show abstract

Evidence and Impacts of Nanoplastic Accumulation on Crop Grains

Jiang

Wang

et al. 2022

Advanced Science

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Nanoplastics are emerging pollutants of global concern. Agricultural soil is becoming a primary sink for nanoplastics generated from plastic debris. The uptake and accumulation of nanoplastics by crops contaminate the food chain and pose unexpected risks to human health. However, whether nanoplastics can enter grains and their impact on the grains of crop grown in contaminated soil is still unknown. Here, the translocation of polystyrene nanoplastics (PS-NPs) in crops, including peanut (Arachis hypogaea L.) and rice (Oryza sativa L.) is investigated. It is demonstrated PS-NPs translocation from the root and accumulation in the grains at the maturation stage. The treatment with PS-NPs (250 mg kg −1 ) increases the empty-shell numbers of rice grain by 35.45%, thereby decreasing the seed-setting rate of rice by 3.02%, and also decreases the average seed weight of peanuts by 3.45%. Moreover, PS-NPs exerted adverse effects on nutritional quality, such as decreasing the content of mineral elements, amino acids, and unsaturated fatty acids. To the knowledge, this is the first report of the presence of nanoplastics in the grains of crop plants grown in soil containing nanoplastics, and the results highlight the impact of nanoplastics on the yield and nutritional quality of crop grains.

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Spectro‐Microscopic Techniques for Studying Nanoplastics in the Environment and in Organisms

Mandemaker¹,

Meirer²

2022

Angewandte Chemie

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Nanoplastics (NPs), small (< 1 μm) polymer particles formed from bulk plastics, are a potential threat to human health and the environment. Orders of magnitude smaller than microplastics (MPs), they might behave differently due to their larger surface area and small size, which allows them to diffuse through organic barriers. However, detecting NPs in the environment and organic matrices has proven to be difficult, as their chemical nature is similar to these matrices. Furthermore, as their size is smaller than the (spatial) detection limit of common analytical tools, they are hard to find and quantify. We highlight different micro-spectroscopic techniques utilized for NP detection and argue that an analysis procedure should involve both particle imaging and correlative or direct chemical characterization of the same particles or samples. Finally, we highlight methods that can do both simultaneously, but with the downside that large particle numbers and statistics cannot be obtained.

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Aggregation kinetics of UV irradiated nanoplastics in aquatic environments

Cited by 151 publications

References 57 publications

A review of microplastics aggregation in aquatic environment: Influence factors, analytical methods, and environmental implications

A review of microplastics aggregation in aquatic environment: Influence factors, analytical methods, and environmental implications

Evidence and Impacts of Nanoplastic Accumulation on Crop Grains

Spectro‐Microscopic Techniques for Studying Nanoplastics in the Environment and in Organisms

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