A preliminary assessment of the interactions between the capping agents of silver nanoparticles and environmental organics

Lau, Boris L. T.; Hockaday, William C.; Ikuma, Kaoru; Furman, Olha; Decho, Alan W.

doi:10.1016/j.colsurfa.2012.11.065

Cited by 72 publications

(49 citation statements)

References 17 publications

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“…Batch studies by Gao et al (2012) and Lau et al (2013) found that the presence of 20 and 5 mg L -1 NOM, respectively, destabilized both unmodified (Gao et al 2012) and surface-modified AgNPs, whereas other studies, which included both batch ) and column Sagee et al 2012) experiments, found that the presence of NOM increased the stability and mobility of AgNPs. With the exception of the batch experiments by Gao et al (2012), all the other studies were conducted using only a single concentration of NOM.…”

Section: Introductionmentioning

confidence: 94%

“…A few recent studies have looked at how the presence of NOM influences AgNP transport Furman et al 2013;Gao et al 2012;Lau et al 2013;Sagee et al 2012). Batch studies by Gao et al (2012) and Lau et al (2013) found that the presence of 20 and 5 mg L -1 NOM, respectively, destabilized both unmodified (Gao et al 2012) and surface-modified AgNPs, whereas other studies, which included both batch ) and column Sagee et al 2012) experiments, found that the presence of NOM increased the stability and mobility of AgNPs.…”

Section: Introductionmentioning

confidence: 96%

“…With the exception of the batch experiments by Gao et al (2012), all the other studies were conducted using only a single concentration of NOM. The various studies used several types of NOM: Suwannee River humic acid (Gao et al 2012;Lau et al 2012;Furman et al 2013), Suwannee River fulvic acid (Lau et al 2012;Furman et al 2013), and humic acid obtained from chemical supply companies (El Badawy 2011; Sagee et al 2012). While most of the studies examined dissolved NOM, a couple of the studies Lau et al 2012) also examined the effect of NOM-coated porous media material.…”

Section: Introductionmentioning

confidence: 98%

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Influence of natural organic matter on fate and transport of silver nanoparticles in saturated porous media: laboratory experiments and modeling

et al. 2015

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Understanding the fate and transport of silver nanoparticles (AgNPs) is of importance due to their widespread use and potential harmful effects on humans and the environment. The present study investigates the fate and transport of widely used Creighton AgNPs in saturated porous media. Previous investigations of AgNP transport in the presence of natural organic matter (NOM) report contradictory results regarding how the presence of NOM affected the stability and mobility of AgNPs. In this work, a nonreactive tracer, AgNPs and a mixture of AgNPs and NOM were injected into a background solution (0.01 mM of NaNO 3 ) flowing through laboratory columns packed with water-saturated glass beads to obtain concentration versus time breakthrough curves. Transport of AgNPs in the presence of NOM was simulated with a model that accounted for both reversible and irreversible attachment. Based upon an analysis of the AgNP breakthrough curves, it was found that addition of NOM at concentrations ranging from 1 to 40 mg L -1 resulted in significant decreases in both the zeroth and first moments of the breakthrough curves. These observations may be attributed to NOM promoting AgNP aggregation and irreversible attachment. Raman and surface-enhanced Raman scattering analysis of NOM-AgNP mixtures revealed that a possible interaction of NOM with AgNP occurred through the carboxylic moieties (-COO -) located in the immediate vicinity of the metallic surface. At higher concentrations of NOM, both the zeroth and first moments of the breakthrough curves increased. Based on modeling and the literature, we hypothesize that as the NOM concentration increases, it begins to coat both the AgNPs and the glass beads, leading to a situation where AgNP transport may be described in the same way that transport of a sorbing hydrophobic compound partitioning to an immobile organic phase is typically described, assuming reversible, rate-limited sorption.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 98%

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Influence of natural organic matter on fate and transport of silver nanoparticles in saturated porous media: laboratory experiments and modeling

et al. 2015

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“…NOM in natural waters could adsorb on the surface of AgNPs and displace the original capping agents of AgNPs such as polyvinylpyrrolidone (PVP) and citrate. 8 Usually, the charge and steric effects provided by the adsorbed NOM on AgNPs surface could disperse and cause a partial disaggregation of AgNPs aggregates. 9 NOM could also inhibit the aggregation of AgNPs induced by ionic strength or specific cations (such as Ca 2+ and Mg 2+ ), leading to more stable AgNPs suspension.…”

Section: ■ Introductionmentioning

confidence: 99%

Particle Coating-Dependent Interaction of Molecular Weight Fractionated Natural Organic Matter: Impacts on the Aggregation of Silver Nanoparticles

Yin

Shen

Tan

et al. 2015

Environ. Sci. Technol.

119

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Ubiquitous natural organic matter (NOM) plays an important role in the aggregation state of engineered silver nanoparticles (AgNPs) in aquatic environment, which determines the transport, transformation, and toxicity of AgNPs. As various capping agents are used as coatings for nanoparticles and NOM are natural polymer mixture with wide molecular weight (MW) distribution, probing the particle coating-dependent interaction of MW fractionated natural organic matter (M f -NOM) with various coatings is helpful for understanding the differential aggregation and transport behavior of engineered AgNPs as well as other metal nanoparticles. In this study, we investigated the role of pristine and M f -NOM on the aggregation of AgNPs with Bare, citrate, and PVP coating (Bare-, Cit-, and PVP-AgNP) in mono-and divalent electrolyte solutions. We observed that the enhanced aggregation or dispersion of AgNPs in NOM solution highly depends on the coating of AgNPs. Pristine NOM inhibited the aggregation of Bare-AgNPs but enhanced the aggregation of PVP-AgNPs. In addition, M f -NOM fractions have distinguishing roles on the aggregation and dispersion of AgNPs, which also highly depend on the AgNPs coating as well as the MW of M f -NOM. Higher MW M f -NOM (>100 kDa and 30−100 kDa) enhanced the aggregation of PVP-AgNPs in mono-and divalent electrolyte solutions, whereas lower MW M f -NOM (10−30 kDa, 3−10 kDa and <3 kDa) inhibited the aggregation of PVP-AgNPs. However, all the M f -NOM fractions inhibited the aggregation of Bare-AgNPs. For PVP-and BareAgNPs, the stability of AgNPs in electrolyte solution was significantly correlated to the MW of M f -NOM. But for Cit-AgNPs, pristine NOM and M f -NOM has minor influence on the stability of AgNPs. These findings about significantly different roles of M f -NOM on aggregation of engineered AgNPs with various coating are important for better understanding of the transport and subsequent transformation of AgNPs in aquatic environment.

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“…The initial coating of ENPs strongly influences the interaction of the particles with DOM, which in turn can affect the stability of the ENPs (52)(53)(54). For this reason, every PM that was reported to have a distinct initial coating is a separate entry in our database.…”

Section: Systematic Trends In Experimental Designs Explain the Reductmentioning

confidence: 99%

A network perspective reveals decreasing material diversity in studies on nanoparticle interactions with dissolved organic matter

Sani-Kast

Labille

Ollivier

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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Dissolved organic matter (DOM) strongly influences the properties and fate of engineered nanoparticles (ENPs) in aquatic environments. There is an extensive body of experiments on interactions between DOM and ENPs and also larger particles. [We denote particles on the nano-and micrometer scale as particulate matter (PM).] However, the experimental results are very heterogeneous, and a general mechanistic understanding of DOM-PM interactions is still missing. In this situation, recent reviews have called to expand the range of DOM and ENPs studied. Therefore, our work focuses on the diversity of the DOM and PM types investigated. Because the experimental results reported in the literature are highly disparate and difficult to structure, a new format of organizing, visualizing, and interpreting the results is needed. To this end, we perform a network analysis of 951 experimental results on DOM-PM interactions, which enabled us to analyze and quantify the diversity of the materials investigated. The diversity of the DOM-PM combinations studied has mostly been decreasing over the last 25 y, which is driven by an increasing focus on several frequently investigated materials, such as DOM isolated from fresh water, DOM in whole-water samples, and TiO 2 and silver PM. Furthermore, there is an underrepresentation of studies into the effect of particle coating on PM-DOM interactions. Finally, it is of great importance that the properties of DOM used in experiments with PM, in particular the molecular weight and the content of aromatic and aliphatic carbon, are reported more comprehensively and systematically.nanoparticles | dissolved organic matter | environmental fate | network analysis | experimental design T he development and use of nanotechnology results in the release of engineered nanoparticles (ENPs) to the environment (1, 2). Much effort in current research is put into assessing the environmental risks of ENPs, which requires the understanding of the fate and distribution of ENPs in different environmental media, as well as their potential toxicity (3-6). Dissolved organic matter (DOM) (e.g., humic substances, polysaccharides, and proteins) is ubiquitous in aquatic systems and is known to interact with ENPs and modify their surface properties (7). DOM has been shown to either stabilize or destabilize aqueous ENP suspensions, depending on DOM properties and medium composition (8, 9). The effects of DOM on the stability of ENP suspensions are expected to strongly influence the mobility and distribution of ENPs in the environment (10).The extraordinary variability in DOM effects on ENPs originates from the fact that the interactions between DOM and ENPs depend on numerous interrelated factors, such as pH and ionic strength of the media, the particles' surface properties and size, and the chemical composition and concentration of the DOM (11). Some types of DOM, such as fulvic and humic acids, electrostatically stabilize ENPs via the adsorption of the electrically charged DOM on the ENP surface (12-16), where the str...

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A preliminary assessment of the interactions between the capping agents of silver nanoparticles and environmental organics

Cited by 72 publications

References 17 publications

Influence of natural organic matter on fate and transport of silver nanoparticles in saturated porous media: laboratory experiments and modeling

Influence of natural organic matter on fate and transport of silver nanoparticles in saturated porous media: laboratory experiments and modeling

Particle Coating-Dependent Interaction of Molecular Weight Fractionated Natural Organic Matter: Impacts on the Aggregation of Silver Nanoparticles

A network perspective reveals decreasing material diversity in studies on nanoparticle interactions with dissolved organic matter

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