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首页> 外文期刊>Environmental Science & Technology >Photochemistry of Aqueous C_(60) Clusters: Wavelength Dependency and Product Characterization
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Photochemistry of Aqueous C_(60) Clusters: Wavelength Dependency and Product Characterization

机译：C_（60）水溶液团簇的光化学：波长依赖性和产物表征

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To construct accurate risk assessment models for engineered nanomaterials, there is urgent need for information on the reactivity (or conversely, persistence) and transformation pathways of these materials in the natural environment As an important step toward addressing this issue, we have characterized the products formed when aqueous C_(60) clusters (nC_(60)) are exposed to natural sunlight and also have assessed the wavelengths primarily responsible for phototransformation. Long-wavelength light λ≥ 400 nm) isolated from sunlight was shown to be important in both the phototransformation of nC_(60) and in the production of ~1O_2. The significance of visible light in mediating the phototransformation of nC_(60) was supported by additional experiments with monochromatic light in which the apparent quantum yield at 436 nm (Φ_(366)= (2.08 ± 0.08) x 10~(-5)) was comparable to that at 366 nm (Φ_(366)nm, = (2.02 ± 0.07) x 10~(-5)). LDI-TOF mass spectrometry indicated that most of the photoproducts formed after 947 h of irradiation in natural sunlight retain a 60 atom carbon structure. A combination of ~(13)C NMR analysis of ~(13)C-enriched nC_(60), X-ray photoelectron spectroscopy and FTIR indicated that photoproducts have olefinic carbon atoms as well as a variety of oxygen-containing functional groups, including vinyl ether and carbonyl or carboxyl groups, whose presence destroys the native π-electron system of C_(60) Thus, the photoreactrvity of nC_(60) in sunlight leads to the formation of water-soluble Ceo derivatives.
机译：为构建工程纳米材料的准确风险评估模型，迫切需要有关这些材料在自然环境中的反应性（或相反，持久性）和转化途径的信息。为解决此问题的重要步骤，我们对所形成的产品进行了表征当水性C_（60）簇（nC_（60））暴露在自然阳光下并且还评估了主要负责光转化的波长时。从太阳光中分离出的长波光（λ≥400 nm）在nC_（60）的光转化和〜1O_2的产生中都非常重要。可见光在调解nC_（60）的光转化中的重要性得到了单色光附加实验的支持，其中在436 nm处的表观量子产率（Φ_（366）=（2.08±0.08）x 10〜（-5））与366 nm（Φ_（366）nm，=（2.02±0.07）x 10〜（-5））相当。 LDI-TOF质谱表明，在自然阳光下947 h照射后形成的大多数光产物都保留了60原子的碳结构。 〜（13）C富集的nC_（60）的〜（13）C NMR分析，X射线光电子能谱和FTIR的组合表明，光产物具有烯属碳原子以及各种含氧官能团，包括乙烯基醚和羰基或羧基，它们的存在会破坏C_（60）的天然π电子系统。因此，nC_（60）在阳光下的光反应性导致形成水溶性Ceo衍生物。

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  • 来源
    《Environmental Science & Technology》 |2010年第21期|p.8121-8127|共7页
  • 作者

    WEN-CHE HOU; LINGJUN KONG; KEVIN A. WEPASNICK; RICHARD G. ZEPP; D. HOWARD FAIRBROTHER; CHAD T. JAFVERT;

  • 作者单位

    School of Civil Engineering, Purdue University, West Lafayette, Indiana 47907, United States,School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, Arizona 85287,United States;

    rnNational Research Council Associate, National Exposure Research Laboratory,Ecosystems Research Division, U.S.,Environmental Protection Agency, Athens, Georgia 30605, United States;

    rnDepartment of Chemistry, Johns Hopkins University, 3400 North Charles Street, Baltimore,Maryland 21218, United States;

    rnEnvironmental Protection Agency, Athens, Georgia 30605, United States;

    rnDepartment of Chemistry, Johns Hopkins University, 3400 North Charles Street, Baltimore,Maryland 21218, United States;

    rnSchool of Civil Engineering, Purdue University, West Lafayette, Indiana 47907, 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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