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首页> 外文期刊>Environmental Science & Technology >Aging Influences on the Biokinetics of Functional TiO_2 Nanoparticles with Different Surface Chemistries in Daphnia magna
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Aging Influences on the Biokinetics of Functional TiO_2 Nanoparticles with Different Surface Chemistries in Daphnia magna

机译：衰老对水蚤不同表面化学功能性TiO_2纳米粒子生物动力学的影响

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摘要

Nanoparticles functionalized with various surface capping moieties are now widely used in different fields, thus there is a major need to understand the behavior and fate of these nanoparticles in the environment. The present study investigated the biokinetics of fresh titanium dioxide nanoparticles (TiO2 NPs) or TiO2 NPs aged under artificial sunlight (16 h light: 8 h dark) for 1, 3, and 5 days, respectively. Two commercial functionalized TiO2 NPs (with SiO2 coating or SiO2 and polydimethylsiloxane coating) were employed in this study. Dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FT-IR), and contact angle (CA) measurements demonstrated that the surface properties had changed due to the degradation during aging. The biokinetic parameters including dissolved uptake and depuration rate constant as well as bioconcentration factors were calculated by a biokinetic model. All the biokinetic parameters were significantly dependent on the aging process. Further data analysis showed that the CA of the TiO2 NPs affected the uptake rate constant and the fast compartmental efflux, and both CA and hydrodynamic diameter affected the fast compartmental efflux. These results were due to the changes of corresponding indexes during the aging process. Our work highlighted the necessity of monitoring the physicochemical indexes of functionalized NPs during aging in evaluation of their environmental risks.
机译：现在，用各种表面封端部分官能化的纳米颗粒已广泛用于不同领域，因此非常需要了解这些纳米颗粒在环境中的行为和命运。本研究研究了在人造阳光（16 h光照：8 h黑暗）下分别老化1天，3天和5天的新鲜二氧化钛纳米颗粒（TiO2 NPs）或TiO2 NPs的生物动力学。这项研究中使用了两种商业功能化的TiO2 NP（具有SiO2涂层或SiO2和聚二甲基硅氧烷涂层）。动态光散射（DLS），傅里叶变换红外光谱（FT-IR）和接触角（CA）测量表明，由于老化过程中的降解，表面性能发生了变化。通过生物动力学模型计算包括溶解摄取和净化速率常数以及生物浓缩因子在内的生物动力学参数。所有的生物动力学参数都明显取决于衰老过程。进一步的数据分析表明，TiO2 NPs的CA影响吸收速率常数和快速室流出，CA和流体动力学直径均影响快速室流出。这些结果是由于老化过程中相应指标的变化所致。我们的工作强调了在老化过程中监测官能化NP的理化指标以评估其环境风险的必要性。

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  • 来源
    《Environmental Science & Technology》 |2018年第14期|7901-7909|共9页
  • 作者

    Fan Wenhong; Lu Huiting; Wang Wen-Xiong;

  • 作者单位

    Beihang Univ, Sch Space & Environm, Beijing 100191, Peoples R China;

    Beihang Univ, Sch Space & Environm, Beijing 100191, Peoples R China;

    HKUST Shenzhen Res Inst, Marine Environm Lab, Shenzhen 518057, 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);
  • 原文格式 PDF
  • 正文语种 eng
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