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首页> 外文期刊>Environmental Science & Technology >Heteroagglomeration of Oxide Nanoparticles with Algal Cells: Effects of Particle Type, Ionic Strength and pH
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Heteroagglomeration of Oxide Nanoparticles with Algal Cells: Effects of Particle Type, Ionic Strength and pH

机译：氧化物纳米颗粒与藻类细胞的异团聚：颗粒类型，离子强度和pH的影响

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摘要

Discharged oxide nanoparticles (NPs) have been shown toxic to unicellular algae, yet the research on heteroagglomeration between NPs and cells as an important precondition of the toxicity is scarce. This study for the first time investigated heteroagglomerations between various NPs and algal cells (Chlorella pyrenoidosa) and analyzed influencing factors including pH and ionic strength (IS) through cosettling experiment, transmission electron microscopic (TEM) observation, and Derjaguin-Landau-Verwey-Overbeek (DLVO) calculation. The examined NPs included anatase and rutile TiO_2, microporous and spherical SiO_2, and α-form and β-form Al_2O_3. The results of cosettling experiments coincided well with the TEM observations, whereas the DLVO theory could only partly explain the NP-cell heteroagglomerations. The NP-cell heteroagglomeration for rutile TiO_2 and β-form Al_2O_3 was weak and insensitive to pH or IS. Preferential heteroagglomeration occurred at low pH or high IS for microporous SiO_2, while marked heteroagglomeration only occurred under the neutral and low IS condition for anatase TiO_2. The heteroagglomeration for spherical SiO_2 was insensitive to pH but increased with increasing IS, while the heteroagglomeration for a-form Al_2O_3 occurred at low pH and irrelevant to IS. The work will shed new light on the bionano interfacial interaction and help to understand biological effects of NPs.
机译：放电氧化物纳米颗粒（NPs）已被证明对单细胞藻类有毒，但是关于NPs与细胞之间异质团聚作为毒性的重要前提的研究很少。这项研究首次调查了各种NP与藻类细胞（小球藻）的异聚，并通过共沉降实验，透射电子显微镜（TEM）观察和Derjaguin-Landau-Verwey-Overbeek分析了影响因素，包括pH和离子强度（IS）。 （DLVO）计算。所检查的NP包括锐钛矿和金红石TiO_2，微孔和球形SiO_2以及α-型和β-型Al_2O_3。共沉淀实验的结果与TEM观测结果非常吻合，而DLVO理论只能部分解释NP细胞杂聚。金红石型TiO_2和β型Al_2O_3的NP-细胞异质团聚作用弱，对pH或IS不敏感。对于微孔SiO_2，在低pH值或高IS下优先发生杂聚，而对于锐钛矿型TiO_2，仅在中性和低IS条件下才发生明显的杂聚。球形SiO_2的杂团聚对pH不敏感，但随IS的增加而增加，而α-型Al_2O_3的杂团聚在低pH下发生且与IS无关。这项工作将为bionano界面相互作用提供新的思路，并有助于了解NP的生物学作用。

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  • 来源
    《Environmental Science & Technology》 |2015年第2期|932-939|共8页
  • 作者

    Si Ma; Kaijun Zhou; Kun Yang; Daohui Lin;

  • 作者单位

    Department of Environmental Science, Zhejiang University, Hangzhou 310058, China;

    Department of Environmental Science, Zhejiang University, Hangzhou 310058, China;

    Department of Environmental Science, Zhejiang University, Hangzhou 310058, China,Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Zhejiang University, Hangzhou 310058, China;

    Department of Environmental Science, Zhejiang University, Hangzhou 310058, China,Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Zhejiang University, Hangzhou 310058, 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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