Deposition and remobilization of graphene oxide within saturated sand packs

Feriancikova, Lucia; Xu, Shangping

doi:10.1016/j.jhazmat.2012.07.041

Cited by 142 publications

(109 citation statements)

References 28 publications

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“…7A). A similar trend was observed in previous reports for another two-dimensional nanomaterial (graphene oxide) (Feriancikova and Xu, 2012), and it was reported that the existence of a secondary minimum contributed to the removal of graphene oxide particles during transport through reversible chemical (electrostatic) interactions. For the MoS 2 -PL a secondary minimum was not observed when MoS 2-MoS 2 interactions were considered.…”

Section: Dlvo Theorysupporting

confidence: 90%

“…The interactions between the PEO functional groups present on the MoS 2 -PL surface and the Si function groups on the quartz collector are likely forming strong intermolecular bonds and resulting in irreversible attachment. This irreversible attachment was not observed in other two-dimensional planar particles (i.e., graphene oxide) that exhibited *100% remobilization once DI water was injected during the release portion of a column experiment (Feriancikova and Xu, 2012;Lanphere et al, 2013). The release experiments highlight the different behaviors for MoS 2 during transport in sand columns; with MoS 2 -PL being the least sensitive to change in IS and less mobile compared with MoS 2 -Li when the remobilization (M R ) parameter was considered at similar conditions.…”

Section: Remobilization Of Mosmentioning

confidence: 85%

“…Calculations were performed using traditional DLVO theory (Verwey, 1947;Derjaguin and Landau, 1993) to simulate MoS 2 -quartz interactions, assuming a constant potential and sphere-plate geometry (Hogg et al, 1966) and can be seen in Tables 2 and 3. A Hamaker constant of 6.26 · 10 -21 J was used for the MoS 2-waterquartz systems (Feriancikova and Xu, 2012), and the EPM measurements for the MoS 2 nanomaterials were converted to zeta potential values using the Smoluchowski equation . The MoS 2 -Li interaction energy profile at 31.6 mM KCl suggest that a secondary minimum ( -5.7 kT) exists at 10 nm.…”

Section: Dlvo Theorymentioning

confidence: 99%

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Fate and Transport of Molybdenum Disulfide Nanomaterials in Sand Columns

Lanphere

Luth

Guiney

et al. 2015

Environmental Engineering Science

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Research and development of two-dimensional transition metal dichalcogenides (TMDC) (e.g., molybdenum disulfide [MoS 2 ]) in electronic, optical, and catalytic applications has been growing rapidly. However, there is little known regarding the behavior of these particles once released into aquatic environments. Therefore, an indepth study regarding the fate and transport of two popular types of MoS 2 nanomaterials, lithiated (MoS 2 -Li) and Pluronic PF-87 dispersed (MoS 2 -PL), was conducted in saturated porous media (quartz sand) to identify which form would be least mobile in aquatic environments. The electrokinetic properties and hydrodynamic diameters of MoS 2 as a function of ionic strength and pH were determined using a zeta potential analyzer and dynamic light scattering techniques. Results suggest that the stability is significantly decreased beginning at 10 and 31.6 mM KCl, for MoS 2 -PL and MoS 2 -Li, respectively. Transport study results from breakthrough curves, column dissections, and release experiments suggest that MoS 2 -PL exhibits a greater affinity to be irreversibly bound to quartz surfaces as compared with the MoS 2 -Li at a similar ionic strength. Derjaguin-Landau-VerweyOverbeek theory was used to help explain the unique interactions between the MoS 2 -PL and MoS 2 -Li surfaces between particles and with the quartz collectors. Overall, the results suggest that the fate and transport of MoS 2 is dependent on the type of MoS 2 that enters the environment, where MoS 2 -PL will be least mobile and more likely be deposited in porous media from pluronic-quartz interactions, whereas MoS 2 -Li will travel greater distances and have a greater tendency to be remobilized in sand columns.

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Section: Dlvo Theorysupporting

confidence: 90%

Section: Remobilization Of Mosmentioning

confidence: 85%

Section: Dlvo Theorymentioning

confidence: 99%

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Fate and Transport of Molybdenum Disulfide Nanomaterials in Sand Columns

Lanphere

Luth

Guiney

et al. 2015

Environmental Engineering Science

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“…However, promoted As(V) transport increased with increasing soil colloid concentration at pH 9.8, although a high ionic strength was associated with a high concentration of soil colloid. According to the DLVO theory (Feriancikova and Xu, 2012;Wu et al, 2013), when the colloids approached the surface of porous media, the electric double layer repulsion would prevent colloids from landing on the surface of porous media at a certain pH (pH 9.8 in this study), and thus colloidal transport was active in porous media. Based on this investigation, the hypothesis was developed and shown in Fig.…”

Section: Mechanism and Hypothesis Of Soil Colloid-promoted As(v) Tranmentioning

confidence: 88%

“…DLVO theory was used to calculate the interaction forces between the soil colloid and the sand, assuming plate-plate interactions (Feriancikova and Xu, 2012;Wu et al, 2013), in order to explain the mechanisms of soil colloid transport and retention in porous media. The DLVO energy interactions, the sum of van der Waals attraction and electric double layer repulsion between the soil colloid and the sand surface, were calculated.…”

Section: Transport Of Soil Colloidsmentioning

confidence: 99%

Blocking effect of colloids on arsenate adsorption during co-transport through saturated sand columns

Guo

Lei

et al. 2016

Environmental Pollution

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a b s t r a c tTransport of environmental pollutants through porous media is influenced by colloids. Co-transport of As(V) and soil colloids at different pH were systematically investigated by monitoring breakthrough curves (BTCs) in saturated sand columns. A solute transport model was applied to characterize transport and retention sites of As(V) in saturated sand in the presence of soil colloids. A colloid transport model and the DLVO theory were used to reveal the mechanism and hypothesis of soil colloid-promoted As(V) transport in the columns. Results showed that rapid transport of soil colloids, regulated by pH and ionic strength, promoted As(V) transport by blocking As(V) adsorption onto sand, although soil colloids had low adsorption for As(V). The promoted transport was more significant at higher concentrations of soil colloids (between 25 mg L À1 and 150 mg L À1) due to greater blocking effect on As(V) adsorption onto the sand surfaces. The blocking effect of colloids was explained by the decreases in both instantaneous (equilibrium) As adsorption and first-order kinetic As adsorption on the sand surface sites. The discovery of this blocking effect improves our understanding of colloid-promoted As transport in saturated porous media, which provides new insights into role of colloids, especially colloids with low As adsorption capacity, in As transport and mobilization in soil-groundwater systems.

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Factors controlling transport of graphene oxide nanoparticles in saturated sand columns

Zhang

Wang

et al. 2014

Enviro Toxic and Chemistry

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The authors conducted column experiments and a modeling study to understand the effects of several environmental factors on the aggregation and transport of graphene oxide nanoparticles (GONPs) in saturated quartz sand. The GONPs were negatively charged and stable under the test conditions (0-50 mM NaCl; pH 4.8-9.0), and the Derjaguin-Landau-Verwey-Overbeek (DLVO) calculation indicated that deposition of GONPs was under unfavorable attachment conditions. The GONPs exhibited high mobility even at an ionic strength of 25 mM NaCl. The transport of GONPs was insensitive to the changes of pH (from 5.1 to 9.0), but the presence of 10 mg/L Suwannee River humic acid (SRHA) considerably enhanced transport at high ionic strength (35 mM NaCl), likely via enhanced steric repulsion and significantly inhibited stacking of GO flakes. Varying flow velocity also enhanced transport at high ionic strength. In general, GONPs exhibit greater mobility compared with other carbon nanoparticles because the aggregation and transport of GONPs are more resilient to changes in solution chemistry and hydrodynamic forces that favor aggregation and deposition of nanoparticles. A 2-site transport model incorporating both the blocking-affected attachment process and straining effects can effectively model the transport of GONPs. The high mobility of GONPs should be given full consideration in assessing their environmental risks.

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Deposition and remobilization of graphene oxide within saturated sand packs

Cited by 142 publications

References 28 publications

Fate and Transport of Molybdenum Disulfide Nanomaterials in Sand Columns

Fate and Transport of Molybdenum Disulfide Nanomaterials in Sand Columns

Blocking effect of colloids on arsenate adsorption during co-transport through saturated sand columns

Factors controlling transport of graphene oxide nanoparticles in saturated sand columns

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