A review of visualization techniques of biocolloid transport processes at the pore scale under saturated and unsaturated conditions

Keller, Arturo A.; Auset, María

doi:10.1016/j.advwatres.2006.05.013

Cited by 110 publications

(92 citation statements)

References 146 publications

(164 reference statements)

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“…Biocolloids include viruses, bacteria, proteins, DNA, spores, algae, protozoa and other microorganisms [45][46][47][48][49]. Biocolloids are of significant interest in the fate and transport of contaminants in aqueous phase, not only in groundwater, but also in surface water [45,50].…”

Section: Biocolloid Geocolloid and Natural Organic Mattermentioning

confidence: 99%

“…Biocolloids are of significant interest in the fate and transport of contaminants in aqueous phase, not only in groundwater, but also in surface water [45,50]. Similar with inorganic colloids (e.g., clays, aluminoscilicates and iron oxyhydroxides), biocolloids can alter the aggregation and dispersion behavior of nanomaterials [46][47][48].…”

Section: Biocolloid Geocolloid and Natural Organic Mattermentioning

confidence: 99%

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Heteroaggregation of nanoparticles with biocolloids and geocolloids

Wang

Adeleye

Huang

et al. 2015

Advances in Colloid and Interface Science

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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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Section: Biocolloid Geocolloid and Natural Organic Mattermentioning

confidence: 99%

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

Self Cite

170

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“…This is qualified as the steric exclusion phenomenon, which explains the rapid flow of colloidal particles. This hydrodynamic effect results in an average velocity of colloidal particles higher than the average carrier fluid velocity [6] [43]; the latest is also the average velocity of the bromide. These three hypotheses also suggest a reduction of particle hydrodynamic dispersion.…”

Section: Transfer and Retention Of Colloidal Particlesmentioning

confidence: 99%

Tracing Water Flow and Colloidal Particles Transfer in an Unsaturated Soil

Predelus¹,

Lassabatère²,

Coutinho³

et al. 2014

JWARP

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In recent years, many studies have been carried out on colloidal particle transfer in the unsaturated zone because they can be a risk to the environment either directly or as a vector of pollutants. A study was conducted on the influence of porous media structure in unsaturated conditions on colloidal particle transport. Three granular materials were set up in columns to replicate a fluvio-glacial soil from the unsaturated zone in the Lyon area (France). It is a sand, a bimodal mixture in equal proportion by weight of sand and gravel, and a fraction of bimodal mixture. Nanoparticles of silica (SiO2-Au-FluoNPs), having a hydrodynamic diameter between 50 and 60 nm, labeled by organic fluorescent molecules were used to simulate the transport of colloidal particles. A nonreactive tracer, bromide ion (Br − ) at a concentration of C0,s = 10 −2 M was used to determine the hydrodispersive properties of porous media. The tests were carried out first, with a solution of nanoparticles (C0,p = 0.2 g/L) and secondly, with a solution of nanoparticles and bromine. The transfer model based on fractionation of water into two phases, mobile and immobile, MIM, correctly fits the elution curves. The retention of colloidal particles is greater in the two media of bimodal particle size than that in the sand, which clearly demonstrates the role of textural heterogeneity in the retention mechanism. The increase in ionic strength produced by alimenting the columns with colloidal particle suspension in the presence of bromide, increases retention up to 25% in the sand. The total concentration profile of nanoparticles collected at the end of the experiment shows that the colloidal particles are retained primarily at the entrance of the columns. Hydrodispersive calculated parameters indicate that flow is more heterogeneous in bimodal media compared to sand. Keywords 697

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“…There is also the possibility of physical straining, clogging, and collection at air-water-soil interfaces when flowing through porous media (Keller and Auset, 2007;Torkzaban et al, 2015;Cornelis et al, 2013). Physical straining of high aspect ratio ENMs in soil has been demonstrated with single-walled carbon nanotubes (Jaisi and Elimelech, 2009) and implicated as a primary retention mechanism for nanoscale Fe 0 (nZVI) in a sandy loam soil (Basnet et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Gravity-driven transport of three engineered nanomaterials in unsaturated soils and their effects on soil pH and nutrient release

Conway

Keller

2016

Water Research

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a b s t r a c tThe gravity-driven transport of TiO 2 , CeO 2 , and Cu(OH) 2 engineered nanomaterials (ENMs) and their effects on soil pH and nutrient release were measured in three unsaturated soils. ENM transport was found to be highly limited in natural soils collected from farmland and grasslands, with the majority of particles being retained in the upper 0e3 cm of the soil profile, while greater transport depth was seen in a commercial potting soil. Physical straining appeared to be the primary mechanism of retention in natural soils as ENMs immediately formed micron-scale aggregates, which was exacerbated by coating particles with Suwannee River natural organic matter (NOM) which promote steric hindrance. Small changes in soil pH were observed in natural soils contaminated with ENMs that were largely independent of ENM type and concentration, but differed from controls. These changes may have been due to enhanced release of naturally present pH-altering ions (Mg 2þ , H þ ) in the soil via substitution processes.These results suggest ENMs introduced into soil will likely be highly retained near the source zone.

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A review of visualization techniques of biocolloid transport processes at the pore scale under saturated and unsaturated conditions

Cited by 110 publications

References 146 publications

Heteroaggregation of nanoparticles with biocolloids and geocolloids

Heteroaggregation of nanoparticles with biocolloids and geocolloids

Tracing Water Flow and Colloidal Particles Transfer in an Unsaturated Soil

Gravity-driven transport of three engineered nanomaterials in unsaturated soils and their effects on soil pH and nutrient release

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