Agglomeration of Ag and TiO2 nanoparticles in surface and wastewater: Role of calcium ions and of organic carbon fractions

Topuz, Emel; Traber, Jacqueline; Sigg, Laura; Talınlı, İlhan

doi:10.1016/j.envpol.2015.05.034

Cited by 29 publications

(22 citation statements)

References 36 publications

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“…Neither agglomeration nor sedimentation was observed in lake waters, as shown by low polydispersity indices (pdi) ( Table 3). Interactions with natural organic matter may increase the stability of Ag NPs as previously described (Ill es and Tomb acz, 2006;Mylon et al, 2004;Topuz et al, 2015). DLS data on the same Ag NPs (Ag NNV-003) from Jemec et al (2016) show that in D. magna OECD202 artificial freshwater (AFW), the D h (at 50 mg/L) was 111 nm and in both ADaM medium (Aachner Daphnienmedium, used here for D. magna assay; Klüttgen et al, 1994) and D. rerio ISO medium, the D h (at 0.5 mg/L) was about 135 nm that indicates comparable agglomerate sizes of the Ag NPs in different media.…”

Section: Characteristics Of Ag and Cuo Nanoparticles In Natural Watermentioning

confidence: 97%

“…S1). This was probably due to the stabilizing (steric) effects of PVP (Topuz et al, 2015;Wang et al, 2005) and organic acids in natural water that may adsorb on the surface of Ag NPs, inducing electrosteric repulsion and increasing the stability of NPs even in the presence low levels of chlorides (Metreveli et al, 2016;Topuz et al, 2015).…”

Section: Characteristics Of Ag and Cuo Nanoparticles In Natural Watermentioning

confidence: 97%

See 1 more Smart Citation

Natural water as the test medium for Ag and CuO nanoparticle hazard evaluation: An interlaboratory case study

Heinlaan

Muna

Knöbel

et al. 2016

Environmental Pollution

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Section: Characteristics Of Ag and Cuo Nanoparticles In Natural Watermentioning

confidence: 97%

Section: Characteristics Of Ag and Cuo Nanoparticles In Natural Watermentioning

confidence: 97%

Natural water as the test medium for Ag and CuO nanoparticle hazard evaluation: An interlaboratory case study

Heinlaan

Muna

Knöbel

et al. 2016

Environmental Pollution

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“…First, Ca 2þ concentrations in selected effluent samples were never higher than 0.01 mM in our experiments, as determined by ICP-MS (data not shown). This concentration is much lower than the 2.5 mM, for which Topuz et al (2014) and Topuz et al (2015) did not observe any significant effect on the agglomeration behavior of PVP-AgNPs. Second, Topuz et al (2014) demonstrated that prolonged exposure of PVP-AgNPs to carbonate (over a week) had little effect on agglomeration behavior.…”

Section: Figmentioning

confidence: 73%

Transport and retention of engineered silver nanoparticles in carbonate-rich sediments in the presence and absence of soil organic matter

Adrian

Schneidewind

Bradford

et al. 2019

Environmental Pollution

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The transport and retention behavior of polymer-(PVP-AgNP) and surfactant-stabilized (AgPURE) silver nanoparticles in carbonate-dominated saturated and unconsolidated porous media was studied at the laboratory scale. Initial column experiments were conducted to investigate the influence of chemical heterogeneity (CH) and nano-scale surface roughness (NR) arising from mixtures of clean, positively charged calcium carbonate sand (CCS), and negatively charged quartz sands. Additional column experiments were performed to elucidate the impact of CH and NR arising from the presence and absence of soil organic matter (SOM) on a natural carbonate-dominated aquifer material. The role of the nanoparticle capping agent was examined under all conditions tested in the column experiments. Nanoparticle transport was well described using a numerical model that facilitated blocking on one or two retention sites. Results demonstrate that an increase in CCS content in the artificially mixed porous medium leads to delayed breakthrough of the AgNPs, although AgPURE was much less affected by the CCS content than PVP-AgNPs. Interestingly, only a small portion of the solid surface area contributed to AgNP retention, even on positively charged CCS, due to the presence of NR which weakened the adhesive interaction. The presence of SOM enhanced the retention of AgPURE on the natural carbonate-dominated aquifer material, which can be a result of hydrophobic or hydrophilic interactions or due to cation bridging. Surprisingly, SOM had no significant impact on PVP-AgNP retention, which suggests that a reduction in electrostatic repulsion due to the presence of SOM outweighs the relative importance of other binding mechanisms. Our findings are important for future studies related to AgNP transport in shallow unconsolidated calcareous and siliceous sands.

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“…The conditions under which the rapid initial aggregation occurs in a specific system may be related to its CCC, which is discussed below. Likewise, the agglomeration phenomenon in the solution that does not have ions in solution also takes place although they are low or despicable, processes of oxidation of the particle and electrostatic interactions between the positive and negative charges of the different functional groups occur [14,[32][33][34][35].…”

Section: Kinetic Aggregation Studiesmentioning

confidence: 99%

“…The smaller particles have a greater aggregation tendency due to lower energy barriers [13,14]. Aggregate formation decreases the surface area of magnetic nanoparticles.…”

Section: Introductionmentioning

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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Agglomeration of Ag and TiO2 nanoparticles in surface and wastewater: Role of calcium ions and of organic carbon fractions

Cited by 29 publications

References 36 publications

Natural water as the test medium for Ag and CuO nanoparticle hazard evaluation: An interlaboratory case study

Natural water as the test medium for Ag and CuO nanoparticle hazard evaluation: An interlaboratory case study

Transport and retention of engineered silver nanoparticles in carbonate-rich sediments in the presence and absence of soil organic matter

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

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