Impact of Natural Organic Matter on the Physicochemical Properties of Aqueous C<sub>60</sub> Nanoparticles

Xie, Bin; Xu, Zhihua; Guo, Wenhua; Li, Qilin

doi:10.1021/es702231g

Cited by 176 publications

(168 citation statements)

References 39 publications

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“…2). It was not possible to determine in this study if aqueous nanoparticles were in dynamic equilibrium with the other phases or if they represented a static, solubilized reservoir of suspended particles 4,5 . Nanoparticles partitioned slowly into the sediments and were essentially equilibrated at the end of 12 days (Fig.…”

Section: Nmmentioning

confidence: 98%

“…As this region is also the habitat for many commercially and ecologically important shellfish and finfish, it could also be a critical point of nanomaterial contaminant entry into the marine food web. For example, salinity gradients, such as those found in tidal mixing zones, typically promote the flocculation and precipitation of organic matter and naturally occurring particulates 4,5 . Organic matter and particulates can be consumed by detritivores or shellfish, and they can also be a sink for anthropogenic material through burial in sediments 6 .…”

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confidence: 99%

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Transfer of gold nanoparticles from the water column to the estuarine food web

et al. 2009

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Within the next five years the manufacture of large quantities of nanomaterials may lead to unintended contamination of terrestrial and aquatic ecosystems 1 . The unique physical, chemical and electronic properties of nanomaterials allow new modes of interaction with environmental systems that can have unexpected impacts 2,3 . Here, we show that gold nanorods can readily pass from the water column to the marine food web in three laboratory-constructed estuarine mesocosms containing sea water, sediment, sea grass, microbes, biofilms, snails, clams, shrimp and fish. A single dose of gold nanorods (65 nm length 3 15 nm diameter) was added to each mesocosm and their distribution in the aqueous and sediment phases monitored over 12 days. Nanorods partitioned between biofilms, sediments, plants, animals and sea water with a recovery of 84.4%. Clams and biofilms accumulated the most nanoparticles on a per mass basis, suggesting that gold nanorods can readily pass from the water column to the marine food web.The transport of contaminants to oceans through estuaries is often mediated by chemical and physical processes associated with mixing fresh water with sea water. As this region is also the habitat for many commercially and ecologically important shellfish and finfish, it could also be a critical point of nanomaterial contaminant entry into the marine food web. For example, salinity gradients, such as those found in tidal mixing zones, typically promote the flocculation and precipitation of organic matter and naturally occurring particulates 4,5 . Organic matter and particulates can be consumed by detritivores or shellfish, and they can also be a sink for anthropogenic material through burial in sediments 6 . At present little is known about the physicochemical behaviour of nanomaterial in the mixing zone, precluding prediction of their eventual environmental distribution. Measurement of nanomaterial distributions in model estuarine systems is a necessary first step towards the evaluation of the effects of nanoparticles on the environment.This study used a series of three replicate estuarine mesocosms as laboratories for measuring the behaviour of nanoparticles in complex environments. These systems are representative of Spartina (cordgrass) dominated estuaries and have been successfully used for estimating the coastal impact of several other contaminants, including atrazine, fipronil, endosulfan and nutrients (Fig. 1) [7][8][9][10] . In this study, three replicates of a complex ecosystem were constructed to model the edge of a tidal marsh creek. The systems were made up from natural, unfiltered sea water from Cherry Point Boat Landing on Wadmalaw Island, South Carolina, USA (salinity determined by conductivity and adjusted to 20‰ by the addition of deionized water) and contained a periodically submerged sediment tray in the primary tank and an attached reservoir for water storage (isolated with a screen) to simulate a tidal cycle [9][10][11] . Sediments were planted with Spartina alterniflora, 100 juvenile Mercenari...

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Section: Nmmentioning

confidence: 98%

mentioning

confidence: 99%

Transfer of gold nanoparticles from the water column to the estuarine food web

et al. 2009

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“…NOM is mainly the residual from plants and animals materials, as well as some of the biocolloids mentioned before [15,22,58]. NOM has been shown to interact strongly with ENMs [59], modifying their surfaces and in general making them more bioavailable [60,61]. Therefore, it is important to understand the nature of NOM.…”

Section: Biocolloid Geocolloid and Natural Organic Mattermentioning

confidence: 99%

Heteroaggregation of nanoparticles with biocolloids and geocolloids

Wang

Adeleye

Huang

et al. 2015

Advances in Colloid and Interface Science

170

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The application of nanoparticles has raised concern over the safety of these materials to human health and the ecosystem. After release into an aquatic environment, nanoparticles are likely to experience heteroaggregation with biocolloids, geocolloids, natural organic matter (NOM) and other types of nanoparticles. Heteroaggregation is of vital importance for determining the fate and transport of nanoparticles in aqueous phase and sediments. In this article, we review the typical cases of heteroaggregation between nanoparticles and biocolloids and/or geocolloids, mechanisms, modeling, and important indicators used to determine heteroaggregation in aqueous phase. The major mechanisms of heteroaggregation include electric force, bridging, hydrogen bonding, and chemical bonding. The modeling of heteroaggregation typically considers DLVO, X-DLVO, and fractal dimension. The major indicators for studying heteroaggregation of nanoparticles include surface charge measurements, size measurements, observation of morphology of particles and aggregates, and heteroaggregation rate determination. In the end, we summarize the research challenges and perspective for the heteroaggregation of nanoparticles, such as the determination of α hetero values and heteroaggregation rates; more accurate analytical methods instead of DLS for heteroaggregation measurements; sensitive analytical techniques to measure low concentrations of nanoparticles in heteroaggregation systems; appropriate characterization of NOM at the molecular level to understand the structures and fractionation of NOM; effects of different types, concentrations, and fractions of NOM on the heteroaggregation of nanoparticles; the quantitative adsorption and desorption of NOM onto the surface of nanoparticles and heteroaggregates; and a better understanding of the fundamental mechanisms and modeling of heteroaggregation in natural water which is a complex system containing NOM, nanoparticles, biocolloids and geocolloids.

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“…Hyung et al [24][25][26] investigated the effect of NOM on the aggregation of nanotubes and C 60 nanoparticles. Hoon et al reported that the stability of MWNTs in the aqueous was strongly dependent on the presence of natural organic matter (NOM).…”

Section: Characterization Of Nanoparticles and Their Complexesmentioning

confidence: 99%

“…The enhanced stabilities might be attributed to the aromatic fractions of NOM. Through thoroughly characterizing for particle size, morphology and electrophoretic mobility, Xie et al [25] found that NOM (Suwannee River humic acid and fulvic acid in paper) caused disaggregation of nC 60 crystal. So the sorption of HA may enhance the stabilities of SiO 2 and kaolinite in the aqueous system, thus cut down the size of nanoparticle aggregates to a certain extent.…”

Section: Characterization Of Nanoparticles and Their Complexesmentioning

confidence: 99%

Sorption of atrazine onto humic acids (HAs) coated nanoparticles

Yan

et al. 2009

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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a b s t r a c tWith the development of nanotechnologies, a large number of nano-materials with novel properties are being released into the environment. However, little is known about their fate, transport, toxicity and interactions with organic matters in aqueous environment. In this study, nano-SiO 2 or kaolinite, coated with soil humic acid (SHA) and peat humic acid (PHA), were used as sorbents. The original and HA-coated nanoparticles were characterized for particle size, TEM and electrophoretic mobility. Sequential ultrafiltration (UF) was used to characterize the molecular size fractionations of dissolved HAs. Sorption data of atrazine (AT) under various solution concentration, ionic strength and pH were well fitted with Freundlich model. Sorption amount of AT on HA-coated nanoparticles was significantly lower than that on original particles. The sorption maximum appeared at I = 0.001 mol/l (NaNO 3 ), pH 3. Size of nanoparticle aggregates, conformation of HA and specific surface area were factors affecting the sorption process. The compressed conformation of HA was more favorable for HA sorption than expanded one. Size of aggregation was not a determinant factor for the sorption process, while the specific surface areas of nano-sorbent was an important one. Results indicated that HA plays an important role in the transport and toxicity of nanoparticles and AT in aqueous environment.

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Impact of Natural Organic Matter on the Physicochemical Properties of Aqueous C₆₀ Nanoparticles

Cited by 176 publications

References 39 publications

Transfer of gold nanoparticles from the water column to the estuarine food web

Transfer of gold nanoparticles from the water column to the estuarine food web

Heteroaggregation of nanoparticles with biocolloids and geocolloids

Sorption of atrazine onto humic acids (HAs) coated nanoparticles

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Impact of Natural Organic Matter on the Physicochemical Properties of Aqueous C60 Nanoparticles

Cited by 176 publications

References 39 publications

Transfer of gold nanoparticles from the water column to the estuarine food web

Transfer of gold nanoparticles from the water column to the estuarine food web

Heteroaggregation of nanoparticles with biocolloids and geocolloids

Sorption of atrazine onto humic acids (HAs) coated nanoparticles

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Impact of Natural Organic Matter on the Physicochemical Properties of Aqueous C₆₀ Nanoparticles