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Influence of siloxane on the transport of ZnO nanoparticles from different release pathways in saturated sand

机译：硅氧烷对饱和砂中不同释放途径转运ZnO纳米粒子的影响

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摘要

The production of nanomaterials (NMs) is expected to grow 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 co-transport 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. This study indicates that the release of ZnO NPs is influenced by the presence of TMDS; the extent of mobility and their transport pathways depend on the pre-existence of TMDS in porous media.
机译：预期纳米材料（NMS）的生产预计将不断增长，但其转化，运输，释放机制以及与环境条件下的污染物的相互作用仍然明白。少数研究已经研究了污染物对NMS的命运和运输的影响，特别是在产品中广泛发现的硅氧烷。假设模型污染物，硅氧烷（例如，1,1,3,3-四甲基二硅氧烷（TMDS））可以影响NMS在不同释放途径下NMS的机制和运输动力学。在两种不同的情况下进行砂柱实验：从混合TMDS和纳米ZnO悬浮液（A）的释放和纳米ZnO从用TMDS（b）污染的砂释放。结果表明，在（a）中，颗粒间反应是占主导地质的，并且颗粒 - 多孔相互作用负责（b）中的阻断效果。洞察力，特别是纳米ZnO的动力学通过污染物和多孔介质从污染物预加载的多孔介质，以及影响饱和砂中纳米ZnO释放和保留的环境因素。衍生这两个主要的传输机制（例如，颗粒间反应和阻断效应）。本研究表明，ZnO NP的释放受TMDS存在的影响;流动性及其运输途径的程度取决于多孔介质中TMD的预存在。

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  • 来源
    《RSC Advances》 |2016年第102期|共10页
  • 作者

    Joo Sung Hee; Knecht Marc; Su Chunming; Seo Seokju; Lawrence Randy;

  • 作者单位

    Univ Miami Dept Civil Architectural &

    Environm Engn 1251 Mem Dr McArthur Engn Bldg Coral Gables FL 33146 USA;

    Univ Miami Dept Chem 1301 Mem Dr Coral Gables FL 33146 USA;

    US EPA Off Res &

    Dev Natl Risk Management Ground Water &

    Ecosyst Restorat Div Res Lab Ada OK 74820 USA;

    Univ Miami Dept Civil Architectural &

    Environm Engn 1251 Mem Dr McArthur Engn Bldg Coral Gables FL 33146 USA;

    Univ Miami Dept Chem 1301 Mem Dr Coral Gables FL 33146 USA;

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  • 正文语种 eng
  • 中图分类 化学;
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