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Influence of siloxane on the transport of ZnO nanoparticles from different release pathways in saturated sand
Citation:
Joo, S., M. Knecht, C. Su, S. Seo, AND R. Lawrence. Influence of siloxane on the transport of ZnO nanoparticles from different release pathways in saturated sand. RSC Advances. RSC Publishing, Cambridge, Uk, 6(102):100494-100503, (2016).
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Submitting to RSC Advances
Description:
Production of nanomaterials (NMs) is expected to arise continuously, yet their transformation, transport, release mechanisms, and interactions with contaminants under environmental conditions remain poorly understood. Few studies have investigated the effects of contaminants on fate and transport of NMs, especially siloxanes that are widely found in products. It is hypothesized that the model contaminant, siloxane (e.g., 1,1,3,3-tetramethyldisiloxane (TMDS)) may influence the mechanisms and transport kinetics of NMs under different release pathways. Sand column experiments were carried out under two different scenarios: the release from a mixed TMDS and nano-ZnO suspension (A) and the release of nano-ZnO from sand contaminated with TMDS (B). Results show that interparticle reactions are dominant in (A) and particle-porous interactions are responsible for blocking effects governing in (B). Insights, especially the kinetics of nano-ZnO from cotransport by a contaminant and from porous media preloaded with a contaminant, and environmental factors affecting the release and retention of nano-ZnO in saturated sand are unveiled. These two dominant transport mechanisms (e.g., interparticle reactions and blocking effects) were derived. Significant deposition of nano-ZnO occurred from sand preloaded with a contaminant, indicating a substantial accumulation of NMs when contaminants pre-exist on porous media.
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Influence of siloxane on the transport of ZnO nanoparticles from different release pathways in saturated sand
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