Transport and deposition of stabilized engineered silver nanoparticles in water saturated loamy sand and silty loam

Braun, Anika; Klumpp, Erwin; Azzam, Rafig; Neukum, Christoph

doi:10.1016/j.scitotenv.2014.12.023

Cited by 67 publications

(51 citation statements)

References 45 publications

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“…They reported that polymeric coatings could not necessarily stabilize AgNPs against deposition unless the collector surfaces are also coated with the polymer. The lower mobility of AgNPs in the soil columns compared to the sand columns can be explained by a high ratio of the surface area to the volume of the fine-grained soils, the mechanical straining of AgNPs, or by the enhanced availability of favorable attachment sites (Braun et al, 2015). Moreover, repulsive interactions arising from the surfactant on the AgNPs were more pronounced in the sand medium than in natural soils (Liang et al, 2013a).…”

Section: Transport and Retention Of Agnps Through Saturated And Unsatmentioning

confidence: 99%

“…Braun et al (2015) reported that no breakthrough of AgNPs occurred in the silty loam soil at a flow velocity of 0.0015 cm min −1 due to high retention and that the RPs were strongly hyperexponential, compared to the exponential distribution of AgNPs in the loamy sand soil. Cornelis et al (2013) observed high retention and small effluent concentrations of AgNPs in 11 natural soil columns.…”

Section: Transport and Retention Of Agnps Through Saturated And Unsatmentioning

confidence: 99%

“…They recovered > 86% of MWCNT in the soil profile and their experiments showed no detectable breakthrough of MWCNT. Several reasons have been mentioned to explain the high retention of NPs in natural soils: sedimentation and straining of NPs on soil minerals following their aggregation and/or heteroaggregation (Cornelis et al, 2013), physical filtration mechanisms (Kasel et al, 2013b), grain size effects, mineralogical composition of the soil or long-term colloidal stability of NPs (Braun et al, 2015;Sagee et al, 2012), nanoscale chemical and physical heterogeneity on the soil surfaces and blocking effects (Liang et al, 2013a), and attachment mechanisms (Bradford et al, 2004). It is reported that soil colloids containing Fe, Al, and Si (Liang et al, 2013a;Neukum et al, 2014) M eff , M soil , and M total are mass percentages recovered from effluent, soil/sand samples, and total (sum of both), respectively; ND -not detected.…”

Section: Transport and Retention Of Agnps Through Saturated And Unsatmentioning

confidence: 99%

“…According to the particle filtration theory, retention and mobility of NPs in porous media are controlled by physicochemical properties of both NPs and collector surfaces, such as the grain size (texture), input concentration, mineralogical composition, the presence of humic acid, the type of coatings or stabilizing agents, the solution chemistry, as well as by hydrodynamic forces (Lin et al, 2011;Liang et al, 2013a,b;Braun et al, 2015). The filtration theory has commonly been employed to describe the deposition of NPs on porous media surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…The information on the fate and behavior of AgNPs in soils will ultimately determine the environmental risk of AgNPs applications. Only recently, have some studies involving the transport of AgNPs in intact soil columns been conducted (Nowack and Bucheli, 2007;Sagee et al, 2012;Cornelis et al, 2013;Liang et al, 2013a;Braun et al, 2015). Neukum et al (2014) suggested that the transport of AgNPs in sandstones is affected by the pore size distribution, mineralogy, and solution chemistry.…”

Section: Introductionmentioning

confidence: 99%

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Transport of silver nanoparticles in intact columns of calcareous soils: The role of flow conditions and soil texture

et al. 2018

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A B S T R A C TGrowing production of manufactured nanomaterials has increased the possibility of contamination of groundwater resources and soils by nanoparticles (NPs). It is crucial to study the fate of NPs in subsurface porous media in order to evaluate and control their risks to ecosystems and human health. Hence, this study was conducted to investigate the transport and retention of polyvinylpyrrolidone (PVP) stabilized silver nanoparticles (AgNPs, a diameter of 40 nm) under saturated and unsaturated conditions in intact columns of two calcareous sandy loam (TR) and loam (ZR) soils. Furthermore, similar experiments were conducted using sand quartz as a reference medium. A pulse of the AgNP suspension with an input concentration (C 0 ) of 50 mg L −1 was injected into the columns for 3 pore volumes. The transport of bromide (Br), as a non-reactive inert tracer, was also examined. High mobility of AgNPs was observed through the sand columns due to unfavorable conditions for AgNP deposition on the quartz sand surfaces. Nearly all AgNPs introduced into the columns of both soils were retained in the soil. Percentages of AgNPs leached out of the columns were < 1% of the total injected mass in both soils. Hyperexponential retention profiles (RPs) were observed in both soils and maximum concentrations of 100-130 mg kg −1 were determined near the columns' inlet. However, slightly stronger retention of AgNPs and greater maximum retained concentrations on the solid phase (S max ) in the ZR soil compared with the TR soil may be attributed to smaller grain sizes of the ZR soil. Hydrodynamic forces adjacent to the solid surfaces near the column inlet can provide a viable explanation for the hyperexponential shape of RPs. The one-site kinetic attachment model in HYDRUS-1D, which accounted for time-and depth-dependent retention, was successfully used to analyze the retention of AgNPs. The results showed that the degree of saturation had little effect on the mobility of AgNPs through undisturbed soil columns. Our results suggested the limited transport of AgNPs in neutral/alkaline calcareous soils under both saturated and unsaturated conditions.

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Section: Transport and Retention Of Agnps Through Saturated And Unsatmentioning

confidence: 99%

Section: Transport and Retention Of Agnps Through Saturated And Unsatmentioning

confidence: 99%

Section: Transport and Retention Of Agnps Through Saturated And Unsatmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Transport of silver nanoparticles in intact columns of calcareous soils: The role of flow conditions and soil texture

et al. 2018

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Parameterization and prediction of nanoparticle transport in porous media: A reanalysis using artificial neural network

Babakhani

Bridge

Doong

et al. 2017

Water Resources Research

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The continuing rapid expansion of industrial and consumer processes based on nanoparticles (NP) necessitates a robust model for delineating their fate and transport in groundwater. An ability to reliably specify the full parameter set for prediction of NP transport using continuum models is crucial. In this paper we report the reanalysis of a data set of 493 published column experiment outcomes together with their continuum modeling results. Experimental properties were parameterized into 20 factors which are commonly available. They were then used to predict five key continuum model parameters as well as the effluent concentration via artificial neural network (ANN)-based correlations. The Partial Derivatives (PaD) technique and Monte Carlo method were used for the analysis of sensitivities and model-produced uncertainties, respectively. The outcomes shed light on several controversial relationships between the parameters, e.g., it was revealed that the trend of K att with average pore water velocity was positive. The resulting correlations, despite being developed based on a ''black-box'' technique (ANN), were able to explain the effects of theoretical parameters such as critical deposition concentration (CDC), even though these parameters were not explicitly considered in the model. Porous media heterogeneity was considered as a parameter for the first time and showed sensitivities higher than those of dispersivity. The model performance was validated well against subsets of the experimental data and was compared with current models. The robustness of the correlation matrices was not completely satisfactory, since they failed to predict the experimental breakthrough curves (BTCs) at extreme values of ionic strengths. Plain Language Summary Models based on advection-dispersion-equation (ADE), have succeeded in describing a variety of nanoparticle (NP) transport mechanisms within subsurface porous media. These models are usually fitted against known observation data to obtain the unknown parameters. Nevertheless, the parameters determined in this way cannot be used for a new problem of the same type and again there exists the need for the data to calibrate the model parameters for a new problem. Black box models, such as artificial neural network (ANN), have been mostly, if not all the times, used in the same way of ADE models, i.e., single problem solver. In this paper we use the ability of ANN to develop a series of simple correlation matrices that can be easily used for the prediction of ADE parameters in the new problem without the need for additional calibration. Although comparisons between ANN model predictions and experimental data show that there is still further work to be done, our approach out-performs other comparable models and offers new insight into the complex interactions among the factors determining NP transport and fate in the environment.

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Study on the effect of ionic strength on particle migration and deposition in porous media covered by biofilm based on coupled Lattice Boltzmann method and Discrete element method

Hong

Chen

Gong

et al. 2022

Asia-Pacific J Chem Eng

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Biofilms covering porous media will interact with particles and affect particle migration. In order to investigate the migration mechanism of particles in porous media covered by biofilms, the migration process of particles with different particle sizes under the condition of the changing ionic strength is analyzed by using the lattice Boltzmann method–discrete element method (LBM‐DEM) coupling method from mesoscopic scale. The variation patterns of ion strength include gradient and mutation, respectively. Also, the agglomeration of particles at the pore throat in porous media is investigated under different conditions. The main results are obtained as follows. First, both the change of ionic strength and its changing mode significantly affect the migration behavior of particles in NaCl solution but have little effect on the behavior of particles in CaCl2 solution. Second, when the pressure difference between the pressure difference between the inlet and outlet of porous media is 0.4 kPa, the residual permeability of 1.5‐μm particles in the NaCl solution with ionic strength mutation is the highest, which has value of 64.92%. Third, at the specific flow rate, the particles in low ionic strength solution are more likely to be settled. The attraction of particles in the CaCl2 solution is one order of magnitude less than that in the NaCl solution, and the accumulated particles are more likely to be dispersed.

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Transport and deposition of stabilized engineered silver nanoparticles in water saturated loamy sand and silty loam

Cited by 67 publications

References 45 publications

Transport of silver nanoparticles in intact columns of calcareous soils: The role of flow conditions and soil texture

Transport of silver nanoparticles in intact columns of calcareous soils: The role of flow conditions and soil texture

Parameterization and prediction of nanoparticle transport in porous media: A reanalysis using artificial neural network

Study on the effect of ionic strength on particle migration and deposition in porous media covered by biofilm based on coupled Lattice Boltzmann method and Discrete element method

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