Removal of graphene oxide nanomaterials from aqueous media via coagulation: Effects of water chemistry and natural organic matter

Duan, Lin; Hao, Runlong; Zhu, Xu; He, Xizhen; Adeleye, Adeyemi S.; Li, Yao

doi:10.1016/j.chemosphere.2016.10.104

Cited by 39 publications

(24 citation statements)

References 49 publications

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“…This is because increasing IS can increase attachment at both primary and secondary minima by decreasing the repulsive Derjaguin–Landau–Verwey–Overbeek (DLVO) energy barrier and increasing secondary‐minimum depth (Hahn and O'Melia, 2004; Hahn et al, 2004; Redman et al, 2004; Kuznar and Elimelech, 2007; Liu et al, 2009). In addition to IS, other factors that can influence the value of α and η include temperature (Wang et al, 2017b), sunlight (Chowdhury et al, 2015), natural organic matter (Duan et al, 2017), and surfactant (Fan et al, 2015; Liu et al, 2015). For example, the presence of dissolved organic matter and surfactant in solutions can increase steric repulsions between GONP and collector surfaces and thus decrease the values of α and η.…”

mentioning

confidence: 99%

Impact of Flow Velocity on Transport of Graphene Oxide Nanoparticles in Saturated Porous Media

Zhang¹,

Yan

Wang³

et al. 2018

Vadose Zone Journal

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Saturated column experiments were conducted to systematically examine transport of graphene oxide nanoparticles (GONPs) in sand porous media at different solution ionic strengths (ISs) with different flow velocities. Results show that deposition of GONPs increase with decreasing IS. However, the Derjaguin-Landau-Verwey-Overbeek (DLVO) interaction energy calculations using a surface element integration technique show that the energy barrier increases with increasing IS for the sheet-shaped colloids interacting with a planar sand surface. In contrast, the presence of nanoscale protruding asperities (NPAs) can cause a decrease in the energy barrier with increasing IS, which facilitates the attachment in primary minima at higher IS. At a given IS, increasing flow velocity increases attachment efficiency on the rough sand surfaces. Torque analysis shows that the maximum hydrodynamic torques are smaller than the adhesive torques, even for GONPs located on the NPAs where the adhesions are the lowest. Consequently, the attachment efficiency cannot be reduced by increasing flow velocity. Additional column experiments confirm that deposited GONPs cannot be detached by increasing flow velocity. Conversely, increase of flow velocity may enhance approaching of GONPs in low-flow regions such as concave areas of sand surfaces and subsequent attachment. Although it has been recognized in the literature that the presence of NPAs can cause decrease of attachment efficiency with increasing flow velocity for spherical colloids under both unfavorable and favorable chemical conditions, our results highlight a different role of surface roughness in attachment and detachment of sheet-shaped colloids under unfavorable conditions.

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mentioning

confidence: 99%

Impact of Flow Velocity on Transport of Graphene Oxide Nanoparticles in Saturated Porous Media

Zhang¹,

Yan

Wang³

et al. 2018

Vadose Zone Journal

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“…A key driver in soil inducing physical transformation of ENMs is the presence of various inorganic (minerals, ions) [37] and organic components (natural organic matter, NOM). [38] Differences in soil texture may greatly affect the aggregation state of ENMs in soil. Soil texture indicates the relative content of mineral particles of different sizes, including gravel, sand, silt, and clay.…”

Section: Drivers Of Enms Transformation In Soilmentioning

confidence: 99%

“…Inorganic ligands such as sulfide, chloride, and phosphate are key drivers involved in the chemical transformation of metal-based ENMs. Sulfide is ubiquitous in the environment and sulfidation is a very common chemical processes for many types of metal based ENMs (e.g., Ag, Cu, ZnO, PbO), based on the Pearson acid-base Natural organic matter (NOM) Aggregation [38,44,46,47] Ionic strength Aggregation [49][50][51] Soil pH Aggregation, dissolution [50,52] Redox potential Reduction, oxidation [42,54] Inorganic ligands Sulfidation, chlorination, phosphorylation [21][22][23][24][25][26][27]56,57] Microorganisms All physical and chemical transformation [29,61] concept. [55] Metal sulfides are usually less soluble than their oxide counterparts.…”

Section: Drivers Of Enms Transformation In Soilmentioning

confidence: 99%

Nanomaterial Transformation in the Soil–Plant System: Implications for Food Safety and Application in Agriculture

Zhang

Guo

Zhang

et al. 2020

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Engineered nanomaterials (ENMs) have huge potential for improving use efficiency of agrochemicals, crop production, and soil health; however, the behavior and fate of ENMs and the potential for negative long‐term impacts to agroecosystems remain largely unknown. In particular, there is a lack of clear understanding of the transformation of ENMs in both soil and plant compartments. The transformation can be physical, chemical, and/or biological, and may occur in soil, at the plant interface, and/or inside the plant. Due to these highly dynamic processes, ENMs may acquire new properties distinct from their original profile; as such, the behavior, fate, and biological effects may also differ significantly. Several essential questions in terms of ENMs transformation are discussed, including the drivers and locations of ENM transformation in the soil–plant system and the effects of ENM transformation on analyte uptake, translocation, and toxicity. The main knowledge gaps in this area are highlighted and future research needs are outlined so as to ensure sustainable nanoenabled agricultural applications.

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“…In seawater, graphene oxide undergoes aggregation and sedimentation, which can further lead to changes in particle size and suspended concentration over time (Chowdhury et al 2013;Duan et al 2017;Goodwin et al 2018). To monitor the size and concentration of graphene oxide during the exposure study, we analyzed samples taken from points approximately 2 to 3 cm above the bottom (area immediately surrounding the oyster) of all exposure chambers.…”

Section: Nanomaterials Exposure Size and Concentrationmentioning

confidence: 99%

A 72‐h exposure study with eastern oysters (Crassostrea virginica) and the nanomaterial graphene oxide

Khan

Adeleye

Burgess

et al. 2019

Enviro Toxic and Chemistry

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Graphene is a 2‐dimensional nanomaterial with unique mechanical, thermal, electrical, and optical properties. With increasing applications of graphene‐family nanomaterials (GFNs) in electronics, biomedicine, and surface coatings, concern for their impacts on aquatic ecosystems is rising. Current information on the toxicity of GFNs, including graphene oxide, is scarce. Filter‐feeding bivalves, such as eastern oysters, are good models for nanomaterial exposure studies. We present results from a 72‐h static renewal oyster study using 1 and 10 mg/L graphene oxide, which, to our knowledge, is the first report on in vivo effects of graphene oxide exposures in marine bivalves. Water samples were analyzed for graphene oxide concentration and size assessments. Gill and digestive gland tissues were evaluated for lipid peroxidation and glutathione‐S‐transferase (GST) activity. In addition, gill sections were fixed for histopathological analyses. Elevated lipid peroxidation was noted in oysters exposed to 10 mg/L graphene oxide. No significant changes in GST activity were observed, but reduced total protein levels were found in digestive gland tissues of exposed oysters at both concentrations. Loss of mucous cells, hemocytic infiltration, and vacuolation were observed in gills of exposed oysters. The results indicate that short‐term graphene oxide exposures can induce oxidative stress and epithelial inflammation and adversely affect overall oyster health. Further investigations regarding the fate and sublethal effects of graphene oxide are critical to understanding the risks associated with a rapidly growing graphene consumer market. Environ Toxicol Chem 2019;38:820–830. Published 2019 Wiley Periodicals Inc. on behalf of SETAC. This article is a US government work and, as such, is in the public domain in the United States of America.

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Removal of graphene oxide nanomaterials from aqueous media via coagulation: Effects of water chemistry and natural organic matter

Cited by 39 publications

References 49 publications

Impact of Flow Velocity on Transport of Graphene Oxide Nanoparticles in Saturated Porous Media

Impact of Flow Velocity on Transport of Graphene Oxide Nanoparticles in Saturated Porous Media

Nanomaterial Transformation in the Soil–Plant System: Implications for Food Safety and Application in Agriculture

A 72‐h exposure study with eastern oysters (Crassostrea virginica) and the nanomaterial graphene oxide

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