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首页> 外文期刊>Environmental Science & Technology >Role of Secondary Particle Formation in the Persistence of Silver Nanoparticles in Humic Acid Containing Water under Light Irradiation
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Role of Secondary Particle Formation in the Persistence of Silver Nanoparticles in Humic Acid Containing Water under Light Irradiation

机译：光照下次生颗粒形成在含水腐殖酸中银纳米颗粒持久性中的作用

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摘要

The wide use of silver nanoparticles (AgNPs) leads to the increasing release of AgNPs into the environment. Dissolved organic matter (DOM) is a key factor affecting the behaviors and fate of AgNPs in the aquatic environment. However, the mechanisms for the DOM-mediated transformations of AgNPs are still not fully understood. In this study, we investigated the persistence of AgNPs in the aquatic environment in the presence of different concentrations of humic acid (HA) over periods of time up to 14 days. The Ag species were monitored and characterized by absorption spectrometry, transmission electron microscopy (TEM), inductively coupled plasma mass spectrometry (ICP-MS), and multicollector ICP-MS (MC-ICP-MS). Results showed that the long-term persistence of AgNPs in HA-containing water was determined by two critical concentrations of HA. When the HA concentration exceeded a lower critical value, AgNPs could be persistent in the solution, and a large number of AgNPs were formed secondarily from the HA-induced reduction of the Ag+ ions released from the primary AgNPs, causing, a redistribution of the particle size. With the HA concentration above a higher critical value, AgNPs could persist in the solution without a significant change in particle size. Notably, we used Ag isotope fractionation to investigate the transformation mechanism of AgNPs. The natural isotopic analysis by MC-ICP-MS revealed that the size redistribution of AgNPs caused significant Ag isotope fractionation, which gave additional evidence for the proposed mechanisms. This study provides new insights into the environmental fate of engineered AgNPs and highlights the usefulness of stable isotope fractionation in environmental nanotechnology.
机译：银纳米颗粒（AgNPs）的广泛使用导致AgNPs向环境中释放的增加。溶解有机物（DOM）是影响AgNP在水生环境中的行为和命运的关键因素。但是，尚不完全了解DOM介导的AgNPs转化的机制。在这项研究中，我们调查了在不同浓度的腐殖酸（HA）存在下长达14天的时间里，AgNP在水生环境中的持久性。通过吸收光谱，透射电子显微镜（TEM），电感耦合等离子体质谱（ICP-MS）和多收集器ICP-MS（MC-ICP-MS）监测和表征Ag的种类。结果表明，AgNPs在含HA的水中的长期持久性取决于两个关键的HA浓度。当HA浓度超过较低的临界值时，AgNPs可能会在溶液中持续存在，然后大量的AgNPs会由于HA诱导的从初级AgNPs释放的Ag +离子的还原而形成，从而导致颗粒的重新分布尺寸。随着HA浓度高于更高的临界值，AgNPs可以保留在溶液中而粒径没有明显变化。值得注意的是，我们使用Ag同位素分级法研究了AgNPs的转化机理。通过MC-ICP-MS进行的自然同位素分析表明，AgNPs的大小重新分布会导致显着的Ag同位素分级分离，这为拟议的机理提供了更多证据。这项研究提供了对工程AgNPs的环境命运的新见解，并强调了稳定同位素分级在环境纳米技术中的有用性。

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  • 来源
    《Environmental Science & Technology》 |2017年第24期|14164-14172|共9页
  • 作者

    Zhang Tuoya; Lu Dawei; Zeng Lixi; Yin Yongguang; He Yujian; Liu Qian; Jiang Guibin;

  • 作者单位

    Chinese Acad Sci, State Key Lab Environm Chem & Ecotoxicol, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China;

    Chinese Acad Sci, State Key Lab Environm Chem & Ecotoxicol, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China;

    Jinan Univ, Sch Environm, Guangzhou Key Lab Environm Exposure & Hlth, Guangzhou 510632, Guangdong, Peoples R China;

    Chinese Acad Sci, State Key Lab Environm Chem & Ecotoxicol, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China;

    Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, State Key Lab Environm Chem & Ecotoxicol, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China;

    Chinese Acad Sci, State Key Lab Environm Chem & Ecotoxicol, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China;

  • 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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