Co-transport of graphene oxide and heavy metal ions in surface-modified porous media

Yin, Xianqiang; Jiang, Yanji; Tan, Yi; Meng, Xiangmin; Sun, Huimin; Wang, Nong

doi:10.1016/j.chemosphere.2018.11.089

Cited by 50 publications

(22 citation statements)

References 58 publications

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“…A similar transport pattern (i.e., the normalized concentration (C/C0) declined with an increase of ω) but a relatively lower mobility of Cu-loaded GO was observed in comparison to that of only GO (Figure 2). This is because the presence of Cu 2+ increased the ζ-potential (less negative) and the hydrodynamic diameter (Dh) of GO (Table 1), and subsequently reduced GO transport in porous media, which is in accordance with the literature [18,21]. Likewise, Qi et al [37] demonstrated that Cu 2+ ions increased the aggregation of GO, thereby generally increasing the transport-enhancement capability of GO.…”

Section: Cotransport Of Cu With Gosupporting

confidence: 83%

“…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.…”

Section: Introductionmentioning

confidence: 99%

“…The authors reported that Cu 2+ transport increased with increasing GO concentration (0-120 mg L −1 ) and decreasing IS (1000-1 mM). Additionally, GO can promote the remobilization of pre-sorbed Pb 2+ and Cd 2+ in humic acid-, kaolinite-, and ferrihydrite-coated sand media; whereas no release of Pb 2+ /Cd 2+ was observed for smectite-coated sand columns [18,21]. Additionally, Zhang et al [20] revealed that the enhanced transport of Pb 2+ was due to the stripped oxidative debris from the surface of GO, which had greater mobility than the GO itself.…”

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 Gosupporting

confidence: 83%

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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“…The modification of the sand with HA followed previously established procedures [22]. Prior to that, the HA was purified according to Yang's method [23].…”

Section: Methodsmentioning

confidence: 99%

Effect of medium properties on the transport of cadmium in saturated porous medium

Zhao

Jiang

Kang

et al. 2021

Environmental Pollutants and Bioavailability

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The presence of different soils composition complicates the transport behaviors of Cd(II) and thus makes it challenging to predict Cd(II) fate and transport. In this study, montmorillonite modified sand, humic acid modified sand and ferrihydrite modified sand were used as medium to explore the effect of modified sand content, pH and ionic strength (IS) on Cd(II) transport. The results revealed that the adsorption capacity of modified sand for Cd(II) was montmorillonite-coated sand>humic acid-coated sand>ferrihydrite-coated sand>quartz sand. While the increase of the coated sand content limited the transport ability of Cd(II) in sand columns. In addition, high IS and low pH promoted the mobility of Cd(II). The specific surface area, surface charge and adsorption sites of coated sand were the factors affecting the transport of Cd(II). This work provides new information on the transport and spread of Cd(II) in the soil and thus to better prevent Cd(II) from polluting the environment.

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“…They reported increases in Cu 2+ transport with decreases in IS and increases in GO concentrations. Additionally, GO have been shown to remobilize pre-sorbed Pb 2+ and Cd 2+ in porous media [13]. Kamrani et al [14,15] observed increased mobility of CDs in both saturated and unsaturated porous media with decreases in IS and increases in pH and collector grain size.…”

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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Co-transport of graphene oxide and heavy metal ions in surface-modified porous media

Cited by 50 publications

References 58 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

Effect of medium properties on the transport of cadmium in saturated porous medium

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

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