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Cited by 284

The DOI matches its Crossref record; 31 of the 31 references it cites were found in a registry or an index.

Aggregation and Stability of Reduced Graphene Oxide: Complex Roles of Divalent Cations, pH, and Natural Organic Matter

Chowdhury, Indranil, Mansukhani, Nikhita D., Guiney, Linda M., Hersam, Mark C., Bouchard, Dermont·2015·Environmental Science & Technology

Abstract

The aggregation and stability of graphene oxide (GO) and three successively reduced GO (rGO) nanomaterials were investigated. Reduced GO species were partially reduced GO (rGO-1h), intermediately reduced GO (rGO-2h), and fully reduced GO (rGO-5h). Specifically, influence of pH, ionic strength, ion valence, and presence of natural organic matter (NOM) were studied. Results show that stability of GO in water decreases with successive reduction of functional groups, with pH having the greatest influence on rGO stability. Stability is also dependent on ion valence and the concentration of surface functional groups. While pH did not noticeably affect stability of GO in the presence of 10 mM NaCl, adding 0.1 mM CaCl2 reduced stability of GO with increased pH. This is due to adsorption of Ca(2+) ions on the surface functional groups of GO which reduces the surface charge of GO. As the concentration of rGO functional groups decreased, so did the influence of Ca(2+) ions on rGO stability. Critical coagulation concentrations (CCC) of GO, rGO-1h, and rGO-2h were determined to be ∼ 200 mM, 35 mM, and 30 mM NaCl, respectively. In the presence of CaCl2, CCC values of GO and rGO are quite similar, however. Long-term studies show that a significant amount of rGO-1h and rGO-2h remain stable in Call's Creek surface water, while effluent wastewater readily destabilizes rGO. In the presence NOM and divalent cations (Ca(2+), Mg(2+)), GO aggregates settle from suspension due to GO functional group bridging with NOM and divalent ions. However, rGO-1h and rGO-2h remain suspended due to their lower functional group concentration and resultant reduced NOM-divalent cation bridging. Overall, pH, divalent cations, and NOM can play complex roles in the fate of rGO and GO.

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Metadata

Authors
Chowdhury, I., Mansukhani, N. D., Guiney, L. M., Hersam, M. C., & Bouchard, D.
Venue
Environmental Science & Technology
Published
2015-09-01
Volume
49
Issue
18
Pages
10886-10893
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
OpenAlex
W2475307258
Cited by
284
References
31
FWCI
17.28
Type
journal article
Language
en
Open access
closed

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