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首页> 外文期刊>Environmental Science & Technology >Probing Photosensitization by Functionalized Carbon Nanotubes
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Probing Photosensitization by Functionalized Carbon Nanotubes

机译：用功能化碳纳米管探测光敏性

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Carbon nanotubes (CNTs) photosensitize the production of reactive oxygen species that may damage organisms by biomembrane oxidation or mediate environmental transformations of CNTs. Photosensitization by derivatized carbon nanotubes from various synthetic methods, and thus with different intrinsic characteristics (e.g., diameter and electronic properties), has been investigated under environmentally relevant aquatic conditions. We used the CNT-sensitized photoisomerization of sorbic acid ((2E,4E)-hexa-2,4-dienoic acid) and singlet oxygen formation to quantify the triplet states (~3CNT~*) formed upon irradiation of selected single-walled carbon nanotubes (SWCNTs) and multiwalled carbon nanotubes (MWCNTs). The CNTs used in our studies were derivatized by carboxyl groups to facilitate their dispersion in water. Results indicate that high-defect-density (thus well-stabilized), small-diameter, and semiconducting-rich CNTs have higher-measured excited triplet state formation and therefore singlet oxygen (~1O_2) yield. Derivatized SWCNTs were significantly more photoreactive than derivatized MWCNTs. Moreover, addition of sodium chloride resulted in increased aggregation and small increases in ~1O_2 production of CNTs. The most photoreactive CNTs exhibited comparable photoreactivity (in terms of ~3CNT~* formation and ~1O_2 yield) to reference natural organic matter (NOM) under sunlight irradiation with the same mass-based concentration. Selected reference NOM could therefore be useful in evaluating environmental photoreactivity or intended antibacterial applications of CNTs.
机译：碳纳米管（CNT）光敏化活性氧，可能通过生物膜氧化或介导CNT的环境转化来破坏生物。已经在与环境有关的水生条件下研究了来自各种合成方法的衍生化碳纳米管的光敏化，因此具有不同的固有特性（例如，直径和电子性质）。我们使用山梨酸（（2E，4E）-hexa-2,4-dienoic acid）的CNT敏化光异构化和单重态氧的形成来量化选择的单壁碳辐照后形成的三重态（〜3CNT〜*）碳纳米管（SWCNT）和多壁碳纳米管（MWCNT）。我们研究中使用的CNT被羧基衍生化，以促进它们在水中的分散。结果表明，高缺陷密度（因此稳定），小直径和富含半导体的CNT具有更高的激发三重态形成量，因此单线态氧（〜1O_2）的产率。衍生化的SWCNT比衍生化的MWCNT具有更高的光反应性。此外，添加氯化钠导致聚集增加，CNT的〜1O_2产量小幅增加。在相同的质量浓度下，在阳光照射下，大多数光反应性CNT表现出与参考天然有机物（NOM）相当的光反应性（在〜3CNT〜*形成和〜1O_2产率方面）。因此，选定的参考NOM可用于评估CNT的环境光反应性或预期的抗菌应用。

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  • 来源
    《Environmental Science & Technology》 |2015年第23期|13835-13843|共9页
  • 作者

    Chia-Ying Chen; Richard G. Zepp;

  • 作者单位

    National Research Council Associate, National Exposure Research Laboratory, Ecosystems Research Division, United States Environmental Protection Agency, Athens, Georgia 30605, United States,Department of Environmental Engineering, National Chung Hsing University, Taichung City 402, Taiwan;

    National Exposure Research Laboratory, Ecosystems Research Division, United States Environmental Protection Agency, Athens, Georgia 30605, 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);
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