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Co-transport of gold nanospheres with single-walled carbon nanotubes in saturated porous media

机译:金纳米球与单壁碳纳米管在饱和多孔介质中的共运

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Porous media transport of engineered nanomaterials (ENMs) is typically assessed in a controlled single particulate environment. Presence of a secondary particle (either natural or engineered) in the natural environment though likely, is rarely taken into consideration in assessing ENMs' transport behavior. This study systematically assesses the effect of a secondary ENM (i.e., pluronic acid modified single-walled carbon nanotubes, PA-SWNTs) on a primary particle (i.e., gold nanospheres, AuNSs) transport through saturated porous media under a wide range of aquatic conditions (1-100 mM NaCl). AuNS hetero-dispersions (i.e., with PA-SWNTs) are transported through saturated sand columns, and the transport behavior is compared to AuNS-only homo-dispersion cases, which display classical ionic strength dependent behavior. AuNS hetero-dispersion, however, is highly mobile with little to no ionic strength-dependent effects. This study also assesses the role of pre-coating of the collectors with PA-SWNTs on AuNSs' mobility, thereby elucidating the role played by the order of introduction of the secondary particles. Pre-existence of the secondary particles in the porous media shows enhanced filtration of primary AuNSs. However, the presence of natural organic matter (NOM) slightly increases AuNS mobility through PA-SWNT coated sand at 10 mM ionic strength. The study results demonstrate that the presence and order of addition of the secondary particles strongly influence primary particles' mobility. Thus ENMs can demonstrate facilitated transport or enhanced removal, depending on the presence of the secondary particulate matter and background solution chemistry. (C) 2016 Elsevier Ltd. All rights reserved.
机译:工程纳米材料(ENM)的多孔介质传输通常是在受控的单个颗粒环境中进行的。尽管很可能在自然环境中存在次生颗粒(天然或工程颗粒),但在评估ENM的运输行为时却很少考虑。这项研究系统地评估了在广泛的水生条件下,次级ENM(即,普鲁尼克酸改性的单壁碳纳米管,PA-SWNTs)对通过饱和多孔介质的初级粒子(即,金纳米球,AuNSs)传输的影响。 (1-100 mM NaCl)。 AuNS杂散(即使用PA-SWNTs)通过饱和砂柱传输,并将传输行为与仅AuNS的均相分散情况进行比较,后者表现出经典的离子强度依赖性行为。但是,AuNS杂散性具有很高的移动性,几乎没有离子强度依赖性。这项研究还评估了用PA-SWNTs预涂集电器对AuNSs迁移性的作用,从而阐明了次级颗粒引入顺序所起的作用。次级粒子在多孔介质中的预先存在显示了初级AuNS的增强过滤。但是,天然有机物(NOM)的存在会稍微增加10mM离子强度下通过PA-SWNT涂层砂的AuNS迁移率。研究结果表明,次级粒子的存在和添加顺序强烈影响初级粒子的迁移率。因此,取决于次要颗粒物的存在和背景溶液的化学性质,ENM可以证明促进了运输或增强了去除。 (C)2016 Elsevier Ltd.保留所有权利。

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