Stability of uncoated and fulvic acids coated manufactured CeO2 nanoparticles in various conditions: From ultrapure to natural Lake Geneva waters

Oriekhova, Olena; Stoll, Serge

doi:10.1016/j.scitotenv.2016.03.184

Cited by 30 publications

(18 citation statements)

References 32 publications

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“…However, limited aggregation is observed for NPs in Lake Geneva water with z-average diameters of less than 1 µm due to the presence of DOC at significant concentrations (1.12 mg/L), enhancing NPs stability. Our results are in agreement with those that were obtained by Oriekhova and Stoll [31]. The authors found CeO2 NPs aggregated in Lake Geneva water with time and negative surface charge with a zeta potential equal to −13.3 ± 0.6 mV.…”

Section: Ceo2 Nanoparticlessupporting

confidence: 93%

“…As shown in Figure 2a, CeO 2 NPs exhibit a stable and positive charge (+21 ± 1 mV) from pH 3.0 to 5.0. Subsequently, ζ potential rapidly decreases to reach the PZC at pH pzc = 6.9 ± 0.1, which is similar to the previously reported studies [31]. An increase of pH leads to charge reversal with ζ potential values equals to −32 ± 2 mV at pH 10 ± 0.1.…”

Section: Characterization Of Nps and Nanoplastic Particles In Ultrapusupporting

confidence: 90%

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Behavior of TiO2 and CeO2 Nanoparticles and Polystyrene Nanoplastics in Bottled Mineral, Drinking and Lake Geneva Waters. Impact of Water Hardness and Natural Organic Matter on Nanoparticle Surface Properties and Aggregation

Ramírez

Gentile²,

Zimmermann³

et al. 2019

Water

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Intensive use of engineered nanoparticles (NPs) in daily products ineluctably results in their release into aquatic systems and consequently into drinking water resources. Therefore, understanding NPs behavior in various waters from naturel to mineral waters is crucial for risk assessment evaluation and the efficient removal of NPs during the drinking water treatment process. In this study, the impact of relevant physicochemical parameters, such as pH, water hardness, and presence of natural organic matter (NOM) on the surface charge properties and aggregation abilities of both NPs and nanoplastic particles is investigated. TiO2, CeO2, and Polystyrene (PS) nanoplastics are selected, owing to their large number applications and contrasting characteristics at environmental pH. Experiments are performed in different water samples, including, ultrapure water, three bottled mineral waters, Lake Geneva, and drinking water produced from Lake Geneva. Our findings demonstrate that both water hardness and negatively charged natural organic matter concentrations, which were measured via dissolved organic carbon determination, are playing important roles. At environmental pH, when negatively charged nanoparticles are considered, specific cation adsorption is promoting aggregation so long as NOM concentration is limited. On the other hand, NOM adsorption is expected to be a key process in NPs destabilization when positively charged PS nanoplastics are considered.

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Section: Ceo2 Nanoparticlessupporting

confidence: 93%

Section: Characterization Of Nps and Nanoplastic Particles In Ultrapusupporting

confidence: 90%

Behavior of TiO2 and CeO2 Nanoparticles and Polystyrene Nanoplastics in Bottled Mineral, Drinking and Lake Geneva Waters. Impact of Water Hardness and Natural Organic Matter on Nanoparticle Surface Properties and Aggregation

Ramírez

Gentile²,

Zimmermann³

et al. 2019

Water

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“…The aggregation rate is also significantly reduced and is found equal to 125 ± 41 and 15 ± 2 nm/min (Fig. SM.6) in the presence of 0.25 and mg/L alginate, accordingly, in good agreement with stabilisation effects related to electrostatic and steric effects (Baalousha, 2009;Oriekhova and Stoll, 2016). Our findings are also supported with SEM images (Fig.…”

Section: Effect Of Alginate Concentration On Heteroaggregation In Laksupporting

confidence: 88%

“…Aggregation is promoted due to the presence of divalent electrolytes, dissolved organic matter and natural colloids (Louie et al, 2013;Oriekhova and Stoll, 2016). The presence of alginate reduces the aggregation rate of CeO2 NPs from 50 ± 8 nm/min to 19 ± 4 nm/min (Fig.…”

Section: Heteroaggregation Kinetics In Lake Watermentioning

confidence: 95%

Heteroaggregation of CeO2 nanoparticles in presence of alginate and iron (III) oxide

Oriekhova

Stoll

2019

Science of The Total Environment

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When manufactured nanoparticles are released to natural waters, heteroaggregation between nanoparticles and water compounds is expected to occur and play a key role in nanoparticle fate, transport and transformation. In this work, the heteroaggregation between CeO2 nanoparticles and Fe2O3 inorganic colloids, which represent the main inorganic fraction from Lake Geneva water, is studied. The heteroaggregation processes between CeO2, Fe2O3 and alginate in multiple water samples are investigated using zeta potential and z-average diameter measurements. The kinetics of heteroaggregation of individual components as well as mixtures of CeO2 nanoparticles and Fe2O3 colloids and alginate are studied using time resolved dynamic light scattering. The global attachment efficiency (αglobal) is calculated using data from kinetic experiments. αglobal for pristine CeO2 nanoparticles varied from 0.5 to 0.7 in lake and synthetic waters and is found around 1 for pristine Fe2O3 and mixture CeO2 and Fe2O3. Our findings demonstrate that heteroaggregation is highly dependent on environmental conditions and resulting electrostatic scenarios. No heteroaggregation at pH 8 between CeO2, Fe2O3 and alginate is observed in ultrapure water, because of electrostatic repulsions between negatively charged compounds. In synthetic and lake waters, the situation is opposite. Indeed, specific adsorption of divalent cations and presence of salt are found to promote heteroaggregation via cation bridging and screening effects. The kinetic experiments indicate that aggregation rate of pristine Fe2O3 is higher (89 nm/min in lake water) compared to pristine CeO2 nanoparticles (50 nm/min) and on the same level as mixture of CeO2 and Fe2O3 (96 nm/min). Low alginate concentration, 0.25 mg/L, has no effect on heteroaggregation in mixture of CeO2 and Fe2O3 in lake and synthetic waters. On the other hand, in natural water, the presence of higher alginate concentration, 2 mg/L, is found to reduce the heteroaggregation rate.

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“…This is because interactions between the charges of the ions and the loads of these functional groups are presented [27][28][29][30][31]. The conditions under which the rapid initial aggregation occurs in a specific system may be related to its CCC, which is discussed below.…”

Section: Kinetic Aggregation Studiesmentioning

confidence: 99%

Study of agglomeration and magnetic sedimentation of Glutathione@Fe3O4 nanoparticles in water medium

Bolívar

González

2018

DYNA

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The study of the efficiency of the magnetic separation of nanoparticles in environment is important for its implementation in the remediation of water bodies. In this work the sedimentation dynamics of Glutathione@MNPs were evaluated for water systems with addition of calcium, zinc and sodium ions in a concentration range of 0-40 mg/L in the presence and absence of a vertical magnetic field of 0.2 T. Also, critical coagulation concentrations (CCC) were determined based on the DLVO theory. Particles stability in the absence of metal ions higher than 8 weeks could be observed, whereas in the presence of these ions the stability was reduced to 8 weeks. Separation of the material from the aqueous phase higher than 90% was obtained both for the presence of ions and for the material after the addition of heavy metals such as Hg and Cr.Keywords: Glutathione; magnetic nanoparticles; aggregation kinetics; magnetic sedimentation.Estudio de aglomeración y sedimentación magnética de nanopartículas de Glutatión@Fe 3 O 4 en medio acuoso Resumen El estudio de la eficiencia de la separación magnética de nanopartículas del medio ambiente es importante para su implementación en la remediación de cuerpos de agua. En este trabajo se evaluó la dinámica de sedimentación de los Glutatión@MNPs en sistemas de agua con adición de iones de calcio, zinc y sodio en un rango de concentración de 0-40 mg/L en presencia y ausencia de un campo magnético vertical de 0,2 T. Las concentraciones críticas de coagulación (CCC) se determinaron basándose en la teoría de DLVO. Se observó estabilidad de la partícula mayor de 8 semanas en ausencia de iones metálicos, mientras que con la presencia de estos iones la estabilidad se redujo a 8 semanas. La separación del material de la fase acuosa superior al 90% se obtuvo tanto para la presencia de iones como para el material después de la adición de metales pesados tales como Hg y Cr.Palabras clave: Glutatión; nanopartículas magnéticas; cinética de agregación; sedimentación magnética.

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Stability of uncoated and fulvic acids coated manufactured CeO2 nanoparticles in various conditions: From ultrapure to natural Lake Geneva waters

Cited by 30 publications

References 32 publications

Behavior of TiO2 and CeO2 Nanoparticles and Polystyrene Nanoplastics in Bottled Mineral, Drinking and Lake Geneva Waters. Impact of Water Hardness and Natural Organic Matter on Nanoparticle Surface Properties and Aggregation

Behavior of TiO2 and CeO2 Nanoparticles and Polystyrene Nanoplastics in Bottled Mineral, Drinking and Lake Geneva Waters. Impact of Water Hardness and Natural Organic Matter on Nanoparticle Surface Properties and Aggregation

Heteroaggregation of CeO2 nanoparticles in presence of alginate and iron (III) oxide

Study of agglomeration and magnetic sedimentation of Glutathione@Fe3O4 nanoparticles in water medium

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