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Exchange of TiO_2 Nanoparticles between Streams and Streambeds

机译：溪流与河床之间TiO_2纳米颗粒的交换

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摘要

The expanding use of manufactured nanoparticles has increased the potential for their release into the natural environment. Particularly, TiO_2 nanoparticles pose significant exposure risk to humans and other living species due to their extensive use in a wide range of fields. To better understand the environmental and health risks associated with the release of TiO_2 nanoparticles, knowledge on their fate and transport is needed. This study evaluates the transport of two different TiO_2 nanoparticles: one commercially available (P25 TiO_2) and the other synthesized at a lab scale (synthesized TiO_2). Laboratory flume, column, and batch experiments were conducted to investigate the processes dominating the transport of TiO_2 nanoparticles between streams and streambeds and to characterize the properties of these nanoparticles under different physicochemical conditions. Results show that the synthesized TiO_2 was more stable compared to the P25 TiO_2, which underwent significant aggregation under the same experimental conditions. As a result, P25 TiO_2 deposited at a faster rate than the synthesized TiO_2 in the streambed. Both types of TiO_2 nanoparticles deposited in the streambed were easily released when the stream velocity was increased. The aggregation and deposition of P25 TiO_2 were highly dependent on pH. A process-based colloid exchange model was applied to interpret the observed transport behavior of the TiO_2 nanoparticles.
机译：人造纳米粒子的广泛使用增加了其释放到自然环境中的潜力。尤其是，由于TiO_2纳米粒子在广泛领域中的广泛使用，对人类和其他生物物种构成了巨大的暴露风险。为了更好地了解与TiO_2纳米颗粒的释放相关的环境和健康风险，需要了解其命运和运输。这项研究评估了两种不同的TiO_2纳米颗粒的传输：一种是市售（P25 TiO_2），另一种是在实验室规模下合成的（合成TiO_2）。进行了实验室水槽，柱和批处理实验，以研究控制TiO_2纳米粒子在流和流床之间传输的过程，并表征了这些纳米粒子在不同物理化学条件下的特性。结果表明，在相同的实验条件下，合成的TiO_2比P25 TiO_2更为稳定。结果，P25 TiO_2的沉积速率比流化床中合成的TiO_2的沉积速率快​​。当流速增加时，沉积在流化床中的两种类型的TiO_2纳米颗粒都容易释放。 P25 TiO_2的聚集和沉积高度依赖于pH。应用基于过程的胶体交换模型来解释观察到的TiO_2纳米粒子的传输行为。

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  • 来源
    《Environmental Science & Technology》 |2009年第20期|7699-7705|共7页
  • 作者

    NATALIA TICIANA BONCAGNI; JUSTO MANUEL OTAEGUI; EVELYN WARNER; TRISHA CURRAN; JIA NHONG REN; MARIA MARTA FIDALGO DE COBTALEZZI;

  • 作者单位

    Department of Chemical Engineering, Insliluto Tecnologico de Buenos Aires, Av Eduardo Madero 399, 1106 Buenos Aires, Argentina;

    Department of Chemical Engineering, Insliluto Tecnologico de Buenos Aires, Av Eduardo Madero 399, 1106 Buenos Aires, Argentina;

    Department of Chemical Engineering, Insliluto Tecnologico de Buenos Aires, Av Eduardo Madero 399, 1106 Buenos Aires, Argentina;

    Department of Environmental Engineering, Texas A&MUniversity-Kingsville, Kingsville, Texas 78363;

    Department of Environmental Engineering, Texas A&MUniversity-Kingsville, Kingsville, Texas 78363;

    Department of Chemical Engineering, Insliluto Tecnologico de Buenos Aires, Av Eduardo Madero 399, 1106 Buenos Aires, Argentina;

  • 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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