Cotransport of graphene oxide and Cu(II) through saturated porous media

Zhou, Dongmei; Jiang, Xuehui; Lu, Yi; Wang, Fan; Huo, Mingxin; Crittenden, John C.

doi:10.1016/j.scitotenv.2016.01.141

Cited by 59 publications

(20 citation statements)

References 41 publications

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“…For example, the amount of Cu associated with concurrent GO in the influents was 0.99 mg L −1 , accounting for 25.3% of total Cu, whereas decreased to 0.84 mg L −1 (21.5%) when ω = 0 and further to 0.57 mg L −1 (14.6%) when ω = 0.45 in the effluents. Zhou et al [15] disclosed that GO had a higher adsorption affinity for Cu 2+ ions than quartz sand did, which led to complexation of GO with pre-adsorbed Cu from sand surface and served as an effective carrier. This is consistent with the findings of Jiang et al [18], that the high affinity of GO for Pb 2+ and Cd 2+ ions presorbed on sands resulted in their remobilization and cotransport through sand columns.…”

Section: Cotransport Of Cu With Gomentioning

confidence: 99%

“…For example, the reported maximum adsorption capacity of Cu 2+ on GO at pH 5.0 was 294 mg g −1 [5]. In addition, extensive studies have reported high mobility, transport, and release of GO in porous media [9][10][11][12][13][14][15]. These findings collectively raised a newly emerging concern that GO could potentially facilitate the transport of heavy metals through the subsurface environment via colloid-facilitated transport of contaminants [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…The facilitated transport of heavy metals by GO has received considerable attention recently [15,[18][19][20][21]. For instance, Zhou et al [15] investigated the effects of GO concentration and solution ionic strength (IS) on the transport of Cu 2+ in porous media. The authors reported that Cu 2+ transport increased with increasing GO concentration (0-120 mg L −1 ) and decreasing IS (1000-1 mM).…”

Section: Introductionmentioning

confidence: 99%

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Cotransport of Cu with Graphene Oxide in Saturated Porous Media with Varying Degrees of Geochemical Heterogeneity

Wang

Fan

et al. 2020

Water

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Graphene oxide (GO) is likely to encounter heavy metals due to its widespread use and inevitable release into the subsurface environment, where the ubiquitous presence of iron oxides (e.g., hematite) would affect their interaction and transport. The present study aimed to investigate the cotransport of GO (20 mg L−1) and copper (0.05 mM CuCl2) in the presence of varying degrees of geochemical heterogeneity represented by iron oxide-coated sand fractions (ω = 0‒0.45) in water-saturated columns under environmentally relevant physicochemical conditions (1 mM KCl at pH 5.0‒9.0). The Langmuir-fitted maximum adsorption capacity of Cu2+ by GO reached 137.6 mg g−1, and the presence of 0.05 mM Cu2+ decreased the colloidal stability and subsequent transport of GO in porous media. The iron oxide coating was found to significantly inhibit the transport of GO and Cu-loaded GO in sand-packed columns, which can be explained by the favorable deposition of the negatively charged GO onto patches of the positively charged iron oxide coatings at pH 5.0. Increasing the solution pH from 5.0 to 9.0 promoted the mobility of GO, with the exception of pH 7.5, in which the lowest breakthrough of GO was observed. This is possibly due to the fact that the surface charge of iron oxide approaches zero at pH 7.5, suggesting that new “favorable” sites are available for GO retention. This study deciphered the complicated interactions among engineered nanomaterials, heavy metals, and geochemical heterogeneity under environmentally relevant physicochemical conditions. Our results highlight the significant role of geochemical heterogeneity, such as iron oxide patches, in determining the fate and transport of GO and GO-heavy metal association in the subsurface environment.

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Section: Cotransport Of Cu With Gomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cotransport of Cu with Graphene Oxide in Saturated Porous Media with Varying Degrees of Geochemical Heterogeneity

Wang

Fan

et al. 2020

Water

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“…Additionally, the facilitated transport of heavy metals by carbon-based nanoparticles have received significant attention recently. For instance, Zhou et al [12] investigated the effects of GO concentration and IS on the transport of Cu 2+ in the sand column. They reported increases in Cu 2+ transport with decreases in IS and increases in GO concentrations.…”

Section: Introductionmentioning

confidence: 99%

Transport of N-CD and Pre-Sorbed Pb in Saturated Porous Media

et al. 2020

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Carbon dots (CDs) are a new type of nanomaterials of the carbon family with unique characteristics, such as their small size (e.g., <10 nm), high water solubility, low toxicity, and high metal affinity. Modification of CDs by Nitrogen functional groups (N-CDs) enhances their metal adsorption capacity. This study investigated the influences of pH (4, 6, and 9), ionic strength (1, 50, and 100 mM), and cation valency (Na+ and Ca2+) on the competitive adsorption of Pb to quartz and N-CD surfaces, the transport and retention of N-CDs in saturated porous media, and the capacity of N-CDs to mobilize pre-adsorbed Pb in quartz columns. Pb adsorption was higher on N-CDs than on quartz surfaces and decreased with increases in ionic strength (IS) and divalent cations (Ca2+) concentration. N-CD mobility in quartz columns was highest at pH of 9- and 1-mM monovalent cations (Na+) and decreased with decreases in pH and increases in ionic strength and ion valency. N-CDs mobilized pre-adsorbed Pb from quartz due to the higher adsorption affinity of Pb to N-CD than to quartz surfaces. These findings provide valuable insights into the transport, retention, and risk assessment of lead in the presence of carbon-based engineered nanoparticles.

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“…Ma et al (2016) investigated the co-transport of soil colloids (<1.2 μm in size) and As at different pH and ionic strength in sand columns, and the results showed that the strong repulsion between the porous media and the soil colloids promoted As transport by blocking the adsorption of As onto the porous media, and the colloids acted not only as a carrier in facilitating solute transport but also as a barrier in the course of solute adsorption. Zhou et al (2016) studied the co-transport of a single layer of graphene oxide (GO) particles and Cu 2+ in granular natural sand columns, and concluded that GO had fairly high mobility and could serve as an effective carrier of Cu 2+ . Some mathematical models have been proposed to characterize the colloid-facilitated transport of contaminants in the dissolved phase (Sen and Khilar, 2006), which generally com-prise the mass balance equations for solid particles and contaminants and the reaction processes among the constituents.…”

Section: Introductionmentioning

confidence: 99%

The seepage transport of heavy metal Pb²⁺ through sand column in the presence of silicon powders

Bai

Zhai

Rao

2019

Journal of Hydrology and Hydromechanics

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The coupled transport of heavy metals with suspended particles has been a topic of growing interest. The main purpose of this study is to experimentally investigate the seepage transport of heavy metal Pb2+ in the presence of silicon powders (SPs) through a sand column under different seepage velocities (v = 0.087–0.260 cm/s), injection Pb2+ concentrations (CP = 0–800 μg/ml) and SP sizes (D50 = 2.8–25.5 μm), which were likely to be encountered in practical engineering. The sand column was installed in a cylindrical chamber of 300 mm in length and 80 mm in internal diameter. The results clearly show that the increase in acidity results in a reduction of the repulsive interactions between SPs and the matrix, and consequently a decrease in the peak values in breakthrough curves (BTCs), especially for larger-sized SPs. The peak values and recovery rate of Pb2+ are obviously increased and an earlier breakthrough can be observed, due to the higher capacity of SPs with negative charge to adsorb heavy metal pollutants such as Pb2+ with positive charge. The adsorption of Pb2+ on SPs can reduce the repulsive forces between SPs and the matrix, thus resulting in the increase of the deposition possibility of SPs and the decrease of peak value and recovery rate.

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Cotransport of graphene oxide and Cu(II) through saturated porous media

Cited by 59 publications

References 41 publications

Cotransport of Cu with Graphene Oxide in Saturated Porous Media with Varying Degrees of Geochemical Heterogeneity

Cotransport of Cu with Graphene Oxide in Saturated Porous Media with Varying Degrees of Geochemical Heterogeneity

Transport of N-CD and Pre-Sorbed Pb in Saturated Porous Media

The seepage transport of heavy metal Pb²⁺ through sand column in the presence of silicon powders

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Cotransport of graphene oxide and Cu(II) through saturated porous media

Cited by 59 publications

References 41 publications

Cotransport of Cu with Graphene Oxide in Saturated Porous Media with Varying Degrees of Geochemical Heterogeneity

Cotransport of Cu with Graphene Oxide in Saturated Porous Media with Varying Degrees of Geochemical Heterogeneity

Transport of N-CD and Pre-Sorbed Pb in Saturated Porous Media

The seepage transport of heavy metal Pb2+ through sand column in the presence of silicon powders

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The seepage transport of heavy metal Pb²⁺ through sand column in the presence of silicon powders