Chemical Engineering

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HETEROAGGREGATION BETWEEN CITRATE-STABILIZED GOLD NANOPARTICLES AND HEMATITE COLLOIDS MECHANISMS AND QUANTIFICATION OF NANOPARTICLE-COLLOID INTERACTIONS

Abstract

Understanding the aggregation behavior of engineered nanomaterials (ENMs) in aqueous environments is essential to understanding their fate, transport, and toxicity. Because naturally occurring colloids will likely be present at much higher concentrations than ENMs in environmental systems, heteroaggregation and attachment with these natural colloids could significantly influence ENM fate and impact on water bodies. This study investigated the heteroaggregation and attachment between hematite (α-Fe2O3) and citrate-capped gold nanoparticles (Cit-AuNPs) in 1 mM KCl. The influence of Cit-AuNP concentration was investigated at pH 6 and pH 8. Attachment was quantified by separation of hematite and hematite-Cit-AuNP aggregates from

Material Code

PBM_6rODb

Reference

31. Radniecki, T.S., et al., Influence of liberated silver from silver nanoparticles on nitrification inhibition of Nitrosomonas europaea. Chemosphere, 2011. 85(1): p. 43-49. 32. Nason, J.A., S.A. McDowell, and T.W. Callahan, Effects of natural organic matter type and concentration on the aggregation of citrate-stabilized gold nanoparticles. Journal of Environmental Monitoring, 2012. 14(7): p. 1885-1892. 33. Lawler, D. and M. Benjamin, Water Quality Engineering: Physical and Chemical Treatment Processes. 2003: McGraw-Hill Companies. 896. 34. Derjaguin, B.V. and L.D. Landau, Theory of stability of strongly charged lyophobic sols and the adhesion of strongly charged particles in solutions of electrolytes. Acta Physicochim. USSR, 1941. 14: p. 633-662. 35. Verwey, E.J.W. and J.T.G. Overbeek, Theory of the Stability of Lyophobic Colloids. 1948, New York: Elsevier.

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