Roles of cation valance and exchange on the retention and colloid-facilitated transport of functionalized multi-walled carbon nanotubes in a natural soil

Zhang, Miaoyue; Bradford, Scott A.; Šimůnek, Jirka; Vereecken, Harry; Klumpp, Erwin

doi:10.1016/j.watres.2016.11.062

Cited by 52 publications

(19 citation statements)

References 57 publications

(84 reference statements)

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“…4) can be related to higher EC (Table 2) and greater divalent cations (data not shown) in ZR soil. Similarly Zhang et al (2017) reported more retention of MWCNT in the presence of Ca 2+ compared with K + ions. They also observed that in the presence of Ca 2+ , the blocking behavior enhanced and RPs exhibited a hyperexponential shape.…”

Section: Transport and Retention Of Agnps Through Saturated And Unsatmentioning

confidence: 86%

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: 86%

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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“…It is reasonable to conclude that the ionic strength will affect the thickness of the double layer of the colloid surface [45,49,50]. Compared with monovalent cations, divalent cations in solutions were more favorable for the colloid deposition by increasing electrostatic attraction between the colloids and sand surfaces, causing the cation bridge [46,47,51]. Thus, the transport of reduced Ni 2+ may be because it involved the interaction between soil colloids and sand.…”

Section: Effect Of Ion Strengthmentioning

confidence: 99%

“…favorable for the colloid deposition by increasing electrostatic attraction between the colloids and sand surfaces, causing the cation bridge [46,47,51]. Thus, the transport of reduced Ni 2+ may be because it involved the interaction between soil colloids and sand.…”

Section: Effect Of Humic Acidmentioning

confidence: 99%

Influence of Soil Colloids on Ni Adsorption and Transport in the Saturated Porous Media: Effects of pH, Ionic Strength, and Humic Acid

Wei¹,

Zhu²,

Wang

et al. 2022

Applied Sciences

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Natural colloids are widely distributed in soil and groundwater. Due to their specific characteristics, colloids can actively involve various transport contaminants, resulting in a complicated fate and the transport of heavy metals to the environment. This study investigated the effects of soil colloids on the adsorption and transport of Ni2+ in saturated porous media under different conditions, including pH, ion strength (IS), and humic acid (HA), because these indexes are non-negligible in the fates of various organic or inorganic matters in the subsurface environment. The results indicate that Ni2+ adsorption by soil colloids slightly increased from 17% to 25% with the increase of pH from 5.5 to 7.5 at the IS of 30 mmol·L−1, whilst it significantly reduced from 55% to 17% with the increase of IS from 0 to 30 mmol·L−1 at a pH of 5.5. Both Langmuir and Freundlich models can fit the adsorption isotherms of Ni2+ on soil colloids and quartz sand. According to the column experiment, the presence of soil colloids increased the initial penetration rate, but could not increase the final transport efficiency of Ni2+ in the effluent. The presence of soil colloids has weakened the effect of IS on Ni2+ transport in the sand column. Moreover, this experiment implies that HA remarkably decreased the Ni2+ transport efficiency from 71.3% to 58.0% in the presence of soil colloids and that there was no significant difference in the HA effect on the Ni2+ transport in the absence of soil colloids.

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“…DLS is the most used tool for the size characterization of spherical particles, commercial equipments being available and widespread. In many cases, these commercial devices, prepared for spheres, are used for the size characterization of non-spherical particles in suspension 11 , 17 – 23 . However, it has been shown that, for these geometries, the contribution of rotational diffusion, not taken into account, can have important effects on the DLS determinations 24 , 25 , and hence alternative approaches must be proposed.…”

Section: Dls For Size Characterization Of Non-spherical Particlesmentioning

confidence: 99%

Determination of the size distribution of non-spherical nanoparticles by electric birefringence-based methods

Arenas-Guerrero

Delgado

Donovan

et al. 2018

Sci Rep

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The in situ determination of the size distribution of dispersed non-spherical nanoparticles is an essential characterization tool for the investigation and use of colloidal suspensions. In this work, we test a size characterization method based on the measurement of the transient behaviour of the birefringence induced in the dispersions by pulsed electric fields. The specific shape of such relaxations depends on the distribution of the rotational diffusion coefficient of the suspended particles. We analyse the measured transient birefringence with three approaches: the stretched-exponential, Watson-Jennings, and multi-exponential methods. These are applied to six different types of rod-like and planar particles: PTFE rods, goethite needles, single- and double-walled carbon nanotubes, sodium montmorillonite particles and gibbsite platelets. The results are compared to electron microscopy and dynamic light scattering measurements. The methods here considered provide good or excellent results in all cases, proving that the analysis of the transient birefringence is a powerful tool to obtain complete size distributions of non-spherical particles in suspension.

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Roles of cation valance and exchange on the retention and colloid-facilitated transport of functionalized multi-walled carbon nanotubes in a natural soil

Cited by 52 publications

References 57 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

Influence of Soil Colloids on Ni Adsorption and Transport in the Saturated Porous Media: Effects of pH, Ionic Strength, and Humic Acid

Determination of the size distribution of non-spherical nanoparticles by electric birefringence-based methods

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