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首页> 外文期刊>Environmental Science & Technology >Aggregation and Dissolution of Silver Nanoparticles in Natural Surface Water
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Aggregation and Dissolution of Silver Nanoparticles in Natural Surface Water

机译：天然地表水中银纳米粒子的聚集和溶解

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摘要

This study investigated aggregation and silver release of silver nanoparticles suspended in natural water in the absence and presence of artificial sun light The influence of the capping layer was investigated using uncoated particles and particles coated with citrate or Tween 80. The experiments were conducted over 15 days in batch mode using a river water matrix. Silver release was monitored over this time while the aggregation state and morphological changes of the silver nanoparticles were tracked using dynamic light scattering and transmission electron microscopy. Results indicate sterically dispersed particles coated with Tween released silver quicker than did bare- and citrate-coated particles, which rapidly aggregated. A dissolved silver concentration of 40 μg/L was reached after just 6 h in the Tween-coated particle systems, accounting for ca. 3% of the total silver. Similar levels of dissolved silver were reached in the uncoated and citrate-coated systems at the end of the 15 days. Silver release was not significantly impacted by the artificial sun light; however, the light (and citrate) imparted significant morphological changes to the particles. Their impact was masked by aggregation, which seemed to be the controlling process in this study.
机译：这项研究调查了在不存在和存在人造阳光的情况下悬浮在天然水中的纳米银颗粒的聚集和银释放。使用未涂覆的颗粒和柠檬酸盐或吐温80涂覆的颗粒研究了覆盖层的影响。实验历时15天在使用河流水矩阵的批处理模式下。在这段时间内监测银的释放，同时使用动态光散射和透射电子显微镜跟踪银纳米颗粒的聚集状态和形态变化。结果表明，涂​​有Tween的空间分散颗粒释放的银比裸露和柠檬酸盐涂覆的颗粒更快地释放，后者迅速聚集。在吐温涂层的颗粒系统中，仅在6小时后，溶解的银浓度达到40μg/ L，约占白银总量的3％。 15天结束时，未涂覆和柠檬酸盐涂覆的系统中银的溶解水平相似。人造阳光对银的释放没有显着影响。然而，光（和柠檬酸盐）使颗粒具有明显的形态变化。它们的影响被聚集掩盖了，这似乎是本研究的控制过程。

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  • 来源
    《Environmental Science & Technology》 |2012年第10期|p.5378-5386|共9页
  • 作者

    Xuan Li; John J. Lenhart;

  • 作者单位

    Department of Civil, Environmental and Geodetic Engineering, The Ohio State University, Columbus, Ohio 43210, United States;

    Department of Civil, Environmental and Geodetic Engineering, The Ohio State University, Columbus, Ohio 43210, United States;

  • 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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