Aggregation kinetics of fragmental PET nanoplastics in aqueous environment: Complex roles of electrolytes, pH and humic acid

Dong, Shanliang; Cai, Wangwei; Xia, Jihong; Sheng, Liting; Wang, Weimu; Liu, Hui

doi:10.1016/j.envpol.2020.115828

Cited by 74 publications

(21 citation statements)

References 55 publications

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“…It is well known that adding a certain amount of electrolyte to the solution will accelerate the aggregation and sedimentation of the colloid [22,23]. In order to explore the effect of electrolyte concentration on colloid sedimentation, Table 1 showed the effects of a series of concentrations of KNO 3 on zeta and LPC in colloidal silica solutions.…”

Section: The Effect Of Electrolytes On the Dispersion Of The Slurrymentioning

confidence: 99%

Methods and Mechanistic Analysis of Improving the Dispersion of Nano Silica Colloidal Particles in Chemical Mechanical Polishing Slurries

Zeng

Zhao

Liu

et al. 2021

Preprint

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The colloidal silica is usually used as the abrasive for the copper CMP polishing slurry in integrated circuit multilayer copper wiring. The aggregation of colloidal silica in the slurries tend to aggregate spontaneously, resulting in the continuous changes of the polishing effect, such as scratch defects, removal rate, etc. This situation can lead to the potential instability of the polishing slurry, which should be avoided in industrial production. In this paper, the aggregation and dispersion properties of polishing slurries were systematically studied, and an improved scheme was proposed to improve the dispersion of slurries to prevent agglomeration. These affecting factors including slurries’ pH, electrolyte additive (KNO3) and polyelectrolyte (PAA-Na) were assessed with LPC, Zeta potential and particle size. A better pH range for slurries was determined from the point of view of isoelectric point and dissolution of colloidal silica. And the dissolution of colloidal silica was verified by UV-vis experiment. Anionic surfactant (SDS), Cationic surfactant (DTAC) and Nonionic surfactant (AEO-15) was analyzed for their dispersion in slurries from the point of view of static electricity force and steric hindrance space force, and the synergistic mechanism of mixed SDS and AEO-15 on slurries dispersion was put forward. In addition, the effect of the improvement of slurry dispersion on reducing scratching defects on the surface of polished copper blanket was also tested in this paper.

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Section: The Effect Of Electrolytes On the Dispersion Of The Slurrymentioning

confidence: 99%

Methods and Mechanistic Analysis of Improving the Dispersion of Nano Silica Colloidal Particles in Chemical Mechanical Polishing Slurries

Zeng

Zhao

Liu

et al. 2021

Preprint

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“…Most studies have used polystyrene (PS) latex spheres, which are perfectly smooth, spherical, and monodisperse in size. Recently, the stability of more environmentally relevant models, such as aged polystyrene (PS) latex spheres, laser-ablated PS, or fragmental PET, has been studied 37,39,43,44 .…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the stability of more environmentally relevant models, such as aged polystyrene (PS) latex spheres, laser-ablated PS, or fragmental PET, has been studied. 37,39,43,44 While these studies allow the emergence of global trends concerning nanoplastic stability, they also have inconsistent conclusions. For example, nanoplastic models have been observed to be both stable and unstable in artificial seawater 33,45 and in the presence of iron.…”

Section: ■ Introductionmentioning

confidence: 99%

“…56 While this has been difficult to demonstrate experimentally, 57 a few aggregation experiments support this theory. 43,58 Also, the collision of irregular and rough particles is likely to occur between particle protrusions and edges. 59 For this reason, it is more accurate to model the interaction energy between NPT-P and asperities, using the smallest radius of curvature as the asperity radius.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Using this approach, the stability of nanoplastics has been assessed in natural waters, − in deionized water with various ionic compositions, ionic strengths, and pHs, ,,,,− in the presence of natural organic matter (NOM) and suspended sediments, ,,,,,,,− and in the presence of extracellular polymeric substances (EPS). , Most studies have used polystyrene (PS) latex spheres, which are perfectly smooth, spherical, and monodisperse in size. Recently, the stability of more environmentally relevant models, such as aged polystyrene (PS) latex spheres, laser-ablated PS, or fragmental PET, has been studied. ,,, …”

Section: Introductionmentioning

confidence: 99%

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Stabilization of Fragmental Polystyrene Nanoplastic by Natural Organic Matter: Insight into Mechanisms

et al. 2021

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The increasing amount of plastic debris in the environment and its disintegration into submicrometric particles is a cause for concern. Due to the colloidal nature of nanoplastics, their environmental fate should be investigated separately from that of microplastics. Abiotic factors greatly influence nanoplastics' stability. This will affect its residence time in the hydrosphere. So, we investigated the behavior of two different nanoplastic models (with different sizes and shapes) regarding ionic strength, pH, and varying concentrations of two natural organic matters: humic acid and sodium alginate. The results demonstrate that both natural organic matters enhanced the aqueous stability of nanoplastics over time at high ionic strengths. Depending on the organic matter's nature, different stabilizing mechanisms were revealed using dynamic light scattering and asymmetrical flow field flow fractionation coupled to static light scattering. Humic acid provides electrostatic repulsion between particles, and some larger humic acid molecules provide a steric hindrance. Sodium alginate sorbs onto and bridges separate particles and small aggregates of nanoplastics. The covered particles are stabilized by steric hindrance. The results highlight the importance of considering natural organic matters' properties when assessing nanoplastics behavior in the environment.

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Nanoplastics and the Marine Environment

Corbett¹,

Amaral‐Zettler²

2022

Plastics and the Ocean

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Aggregation kinetics of fragmental PET nanoplastics in aqueous environment: Complex roles of electrolytes, pH and humic acid

Cited by 74 publications

References 55 publications

Methods and Mechanistic Analysis of Improving the Dispersion of Nano Silica Colloidal Particles in Chemical Mechanical Polishing Slurries

Methods and Mechanistic Analysis of Improving the Dispersion of Nano Silica Colloidal Particles in Chemical Mechanical Polishing Slurries

Stabilization of Fragmental Polystyrene Nanoplastic by Natural Organic Matter: Insight into Mechanisms

Nanoplastics and the Marine Environment

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