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Aggregation of reduced graphene oxide and its nanohybrids with magnetite and elemental silver under environmentally relevant conditions
Citation:
Park, C., D. Wang, J. Heo, N. Her, AND C. Su. Aggregation of reduced graphene oxide and its nanohybrids with magnetite and elemental silver under environmentally relevant conditions. Journal of Nanoparticle Research. Springer SBM, New York, NY, 20:93-93, (2018). https://doi.org/10.1007/s11051-018-4202-x
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Submitting to Water Research.
Description:
The aggregation and long-term (25 d) sedimentation behaviors of reduced graphene oxide (RGO) and its three successively self-assembled nanohybrids with magnetite (Fe3O4) and zerovalent silver (Ag0) nanoparticles were investigated. The aggregation behaviors of the nanomaterials in NaCl and CaCl2 were found to be in good agreement with Derjaguin–Landau–Verwey–Overbeek (DLVO)-type interactions and the Schulze-Hardy rule. The colloidal stability decreased with increasing the ratios of the edge-based surface functional groups (COO- and C=O) of RGO quantified by X-ray photoelectron spectroscopy analysis. In the presence of NOM, the aggregation of RGO and its nanohybrids was greatly inhibited primarily due to enhanced electrosteric repulsions arising from the adsorbed NOM macromolecules. The long-term sedimentation kinetics results showed that RGO nanohybrids were less stable in synthetic ground water containing higher electrolyte concentrations, which is likely due to greater charge screening or neutralization effect imparted by higher monovalent and divalent electrolyte concentrations. Our findings have important implications for evaluating environmental impacts and toxicity of the emerging class of multifunctional nanohybrids whose environmental behaviors are largely unknown currently.
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DOI: Aggregation of reduced graphene oxide and its nanohybrids with magnetite and elemental silver under environmentally relevant conditions
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