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首页> 外文期刊>Environmental Science & Technology >Transport of Industrial PVP-Stabilized Silver Nanoparticles in Saturated Quartz Sand Coated with Pseudomonas aeruginosa PAO1 Biofilm of Variable Age
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Transport of Industrial PVP-Stabilized Silver Nanoparticles in Saturated Quartz Sand Coated with Pseudomonas aeruginosa PAO1 Biofilm of Variable Age

机译：工业PVP稳定化的银纳米颗粒在铜绿假单胞菌PAO1生物膜包裹的饱和年龄石英砂中的运输

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摘要

Understanding the environmental fate and transport of engineered nanoparticles (ENPs) is of paramount importance for the formation and validation of regulatory guidelines regarding these new and increasingly prevalent materials. The present study assessed the transport of an industrial formulation of poly(vinylpyrrolidone)-stabilized silver nanoparticle (PVP-nAg) in columns packed with water-saturated quartz sand and the same sand coated with Pseudomonas aeruginosa PAO1 biofilm of variable age (i.e., growth period). Physicochemical characterization studies indicate that the PVP-nAg is stable in suspension and exhibits little change in size or electrophoretic mobility with changing ionic strength (IS) in either NaNO_3 or Ca(NO_3)_2. The collector surface had a relatively homogeneous biofilm coating, as determined by CLSM, and a near uniform distribution of biomass and biofilm thickness following column equilibration. Transport experiments in clean sand revealed changes in the particle deposition behavior only at and above 10 raM IS Ca(NO_3)_2 and showed no discernible change in PVP-nAg transport behavior in the presence of 1 to 100 mM NaNO_3. Transport experiments in P. aeruginosa-coated sand indicated significantly reduced retention of PVP-nAg at low IS compared to clean sand, irrespective of biofilm age. Nanoparticle retention was also generally reduced in the biofilm-coated sand at the higher IS, but to a lesser extent. The decreased retention of PVP-nAg in biofilm-coated sand compared to clean sand is likely due to repulsive electrosteric forces between the PVP coatings and extracellular polymeric substances (EPS) of the biofilm. Additionally, the slope of the rising portion of the PVP-nAg breakthrough curve was noticeably steeper in biofilm conditions than in clean sand. More mature biofilm coating also resulted in earlier breakthrough of PVP-nAg compared to younger biofilm coatings, or to the clean sand, which may be an indication of the effect of repulsive surface forces combined with selective pore size exclusion from the pores of denser, more developed biofilm. These results, when considered with other literature, indicate the importance in considering the flow dynamics, pore network and structure, the effective particle size, and particle permeability with regard to the biofilm matrix when considering the possible influence of biofilms on ENP transport.
机译：了解环境命运和工程化纳米颗粒（ENP）的运输对于形成和验证有关这些新的和日益流行的材料的监管准则至关重要。本研究评估了聚乙烯吡咯烷酮稳定化的银纳米颗粒（PVP-nAg）的工业制剂在装有水饱和石英砂和铜砂假单胞菌PAO1生物膜包被的不同年龄（即生长）生物膜中的运输。期）。理化特征研究表明，PVP-nAg在悬浮液中稳定，并且在NaNO_3或Ca（NO_3）_2中，随着离子强度（IS）的变化，其大小或电泳迁移率几乎没有变化。通过CLSM测定，收集器表面具有相对均一的生物膜涂层，并且在柱平衡后，生物质和生物膜的厚度几乎均匀分布。在干净的沙子中进行的运输实验表明，只有在10 raM IS Ca（NO_3）_2或以上时，颗粒沉积行为才会发生变化，并且在存在1至100 mM NaNO_3的情况下，PVP-nAg的运输行为没有明显变化。在铜绿假单胞菌覆盖的沙土中进行的运输实验表明，与低聚沙土相比，无论生物被膜的年龄如何，在低IS下PVP-nAg的保留量均显着降低。通常，在较高IS下，生物膜涂覆的沙子中的纳米颗粒保留也降低了，但是程度较小。与干净的沙子相比，PVP-nAg在生物膜覆盖的沙子中保留的减少可能是由于PVP涂层和生物膜的细胞外聚合物（EPS）之间的排斥性电动势。此外，在生物膜条件下，PVP-nAg突破曲线上升部分的斜率比在干净的沙地中明显更陡。与较年轻的生物膜涂层或干净的沙子相比，更成熟的生物膜涂层还导致PVP-nAg的更早突破，这可能表明排斥表面力的作用以及从较稠密的孔中排除选择性孔径的影响，更多。发达的生物膜。当与其他文献一起考虑时，这些结果表明，在考虑生物膜对ENP传输的可能影响时，考虑生物膜基质的流动动力学，孔隙网络和结构，有效粒径以及颗粒渗透性的重要性。

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  • 来源
    《Environmental Science & Technology》 |2014年第5期|2715-2723|共9页
  • 作者

    Michael R. Mitzel; Nathalie Tufenkji;

  • 作者单位

    Department of Chemical Engineering, McGill University, Montreal, Quebec H3A 0C5, Canada,Department of Natural Resource Sciences, McGill University, Montreal, Quebec H3A 0C5, Canada;

    Department of Chemical Engineering, McGill University, Montreal, Quebec H3A 0C5, Canada;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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