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首页> 外文期刊>Environmental Science & Technology >In-Situ Measurements of Engineered Nanoporous Particle Transport in Saturated Porous Media
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In-Situ Measurements of Engineered Nanoporous Particle Transport in Saturated Porous Media

机译：工程纳米多孔颗粒在饱和多孔介质中的原位测量

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摘要

Engineered nanoporous particles have become an important class of nanostmctured materials that have been increasingly applied in energy, biomedical, and environmental researches and industries. The internal pore surfaces in the particles can be chemically functionalized for environmental applications to sequestrate metals and radionuclide contaminants from groundwater. The fate and transport of the nanoporous particles in subsurface environments, however, have not been studied. Here we present a scanning optical fiber fluorescence profiler that can be used to in situ monitor the transport of fluorescent particles in column systems. Engineered nanoporous silicate particles (ENSPs) that were covalerrtiy bounded with fluorescence-emitting, and uranium-chelating ligands in the intrapaitcle pore domains were synthesized and used as an example to investigate nanoporous particle transport and to demonstrate the application of the developed in situ measurement profiler. The profiler detected an "irreversible" or slowly detached fraction of ENSPs in a sand collector even under thermodynamically unfavorable conditions for particle attachment Further, the in situ measurement system detected the spatial variability of ENSPs transportthat deviated from one-dimensional, homogeneous assumption, which is typically used to model particle transport in column systems. Generally, however, both measured and model-calculated results indicated that the transport of ENSPs was consistent with that of nonporous colloidal particles subjected to coupled reversible attachment/ detachment and straining processes. The developed system can also be applied to detect other fluorescent nanostructured or colloidal particles in porous media.
机译：工程纳米多孔颗粒已成为一类重要的纳米结构材料，已越来越多地应用于能源，生物医学，环境研究和行业。颗粒中的内部孔表面可以被化学官能化以用于环境应用，以从地下水中螯合金属和放射性核素污染物。然而，尚未研究纳米多孔颗粒在地下环境中的命运和运输。在这里，我们介绍了一种扫描光纤荧光轮廓仪，可用于在柱系统中原位监测荧光颗粒的运输。合成了与荧光发射结合的工程化纳米多孔硅酸盐颗粒（ENSP），以及在颗粒内孔域中的铀螯合配体，并作为实例研究了纳米多孔颗粒的传输并证明了开发的原位测量轮廓仪的应用。剖析仪甚至在热力学不利的条件下，也能在集砂器中检测到集砂器中ENSP的“不可逆”或缓慢分离的部分，此外，原位测量系统还检测到ENSP迁移的空间变异性偏离一维均质假设，即通常用于模拟色谱柱系统中的颗粒传输。然而，通常，测量和模型计算的结果均表明，ENSP的运输与经历了可逆的附着/分离和拉紧过程的无孔胶体颗粒的运输是一致的。所开发的系统还可用于检测多孔介质中的其他荧光纳米结构或胶体颗粒。

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  • 来源
    《Environmental Science & Technology》 |2010年第21期|p.8190-8195|共6页
  • 作者

    JIANYING SHANG; CHONGXUAN LIU; ZHEMING WANG; HONG WU; KAKE ZHU; JUAN LI; JUN LIU;

  • 作者单位

    Pacific Northwest National Laboratory, Richland, Washington 99354;

    rnPacific Northwest National Laboratory, Richland, Washington 99354;

    rnPacific Northwest National Laboratory, Richland, Washington 99354;

    rnPacific Northwest National Laboratory, Richland, Washington 99354;

    rnPacific Northwest National Laboratory, Richland, Washington 99354;

    rnPacific Northwest National Laboratory, Richland, Washington 99354;

    rnPacific Northwest National Laboratory, Richland, Washington 99354;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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