Mobility of nanosized cerium dioxide and polymeric capsules in quartz and loamy sands saturated with model and natural groundwaters

WATER RESEARCH

卷:47

Article

Petosa, Adamo Riccardo¹  Oehl, Carolin¹  Rajput, Faraz¹  Tufenkji, Nathalie¹ 

[1] McGill Univ, Dept Chem Engn, Montreal, PQ H3A 2B2, Canada

关键词: Cerium dioxide;    Nanoparticle;    Transport;    Polyacrylic acid;    Nanoparticle tracking analysis;    Loamy sand;   

DOI  :  10.1016/j.watres.2013.07.006

来源: Elsevier

【 摘 要 】

The environmental and health risks posed by emerging engineered nanoparticles (ENPs) released into aquatic environments are largely dependent on their aggregation, transport, and deposition behavior. Herein, laboratory-scale columns were used to examine the mobility of polyacrylic acid (PAA)-coated cerium dioxide nanoparticles (nCeO(2)) and an analogous nanosized polymeric capsule (nCAP) in water saturated quartz sand or loamy sand. The influence of solution ionic strength (IS) and cation type (Na+, Ca2+, or Me2+) on the transport potential of these ENPs was examined in both granular matrices and results were also compared to measurements obtained using a natural groundwater. ENP suspensions were characterized using dynamic light scattering and nanoparticle tracking analysis to establish aggregate size, and laser Doppler electrophoresis to determine ENP electrophoretic mobility. Regardless of IS, virtually all nCeO(2) particles suspended in NaNO3 eluted from the quartz sand-packed columns. In contrast, heightened nCeO(2) and nCAP particle retention and dynamic (time-dependent) transport behavior was observed with increasing concentrations of the divalent salts and in the presence of natural groundwater. Enhanced particle retention was also observed in loamy sand in comparison to the quartz sand, emphasizing the need to consider the nature of the aqueous matrix and granular medium in evaluating contamination risks associated with the release of ENPs in natural and engineered aquatic environments. (C) 2013 Elsevier Ltd. All rights reserved.

【 授权许可】

Free