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首页> 外文期刊>Environmental Science & Technology >Polymeric Nanofiber-Carbon Nanotube Composite Mats as Fast-Equilibrium Passive Samplers for Polar Organic Contaminants
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Polymeric Nanofiber-Carbon Nanotube Composite Mats as Fast-Equilibrium Passive Samplers for Polar Organic Contaminants

机译：聚合物纳米纤维 - 碳纳米管复合垫作为极地有机污染物的快速平衡被动采样器

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摘要

To improve the performance of polymeric electrospun nanofiber mats (ENMs) for equilibrium passive sampling applications in water, we integrated two types of multiwalled carbon nanotubes (CNTs; with and without surface carboxyl groups) into polyacrylonitrile (PAN) and polystyrene (PS) ENMs. For 11 polar and moderately hydrophobic compounds (-0.07 ≤ logK_(OW) ≤ 3.13), 90% of equilibrium uptake was achieved in under 0.8 days (t_(90%) values) in nonmixed ENM-CNT systems. Sorption capacity of ENM-CNTs was between 2- and 50-fold greater than pure polymer ENMs, with equilibrium partition coefficients (K_(ENM-W) values) ranging from 1.4 to 3.1 log units (L/kg) depending on polymer type (hydrophilic PAN or hydrophobic PS), CNT loading (i.e., values increased with weight percent (wt %) of CNTs), and CNT type (i.e., greater uptake with carboxylated CNTs composites). During field deployment at Muddy Creek in North Liberty, Iowa, optimal ENM-CNTs (PAN with 20 wt % carboxylated CNTs) yielded atrazine concentrations in surface water with a 40% difference relative to analysis of a same-day grab sample. We also observed a mean percent difference of 30 (±20)% when comparing ENM-CNT sampler results to grab sample data collected within 1 week of deployment. With their rapid, high capacity uptake and small material footprint, ENM-CNT equilibrium passive samplers represent a promising alternative to complement traditional integrative passive samplers while offering convenience over large volume grab sampling.
机译：为了提高聚合物电纺纳米纤维垫（ENOM）在水中的平衡被动采样应用的性能，我们将两种类型的多壁碳纳米管（CNTS;用和没有表面羧基）纳入聚丙烯腈（锅）和聚苯乙烯（PS）烯醇中。对于11个极和中间疏水性化合物（-0.07≤逻辑（OW）≤3.13），在非混合铕系统中的0.8天（T_（90％）值）下实现了90％的平衡摄取。 enm-CNT的吸附能力在比纯聚合物eNM大的2-至50倍之间，具有根据聚合物类型的1.4至3.1对数单元（L / kg）的平衡分配系数（K_（enm-W）值）（亲水盘或疏水PS），CNT载荷（即，值增加了CNT的重量百分比（WT％））和CNT型（即，用羧化的CNT复合材料较大的摄取）。在北自由的Muddy Creek的现场部署过程中，IOWA的最佳enm-CNT（PAN具有20wt％羧化CNT），在地表水中产生亚唑嗪浓度，相对于对同一天抓取样品的分析，差异为40％。当比较eNM-CNT采样器的结果时，我们还观察到30个（±20）％的平均百分比差异为抓取在部署1周内收集的样本数据。凭借其快速，高容量的吸收和小型材料足迹，Enm-CNT均衡被动采样器代表了有希望的替代方案，可以补充传统的综合无源采样器，同时提供大量抓取采样的便利性。

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  • 来源
    《Environmental Science & Technology》 |2020年第11期|6703-6712|共10页
  • 作者

    Jiajie Qian; Andres Martinez; Rachel F. Marek; Matthew R Nagorzanski; Hui Zhi; Edward T. Furlong; Dana W. Kolpin; Gregory H. LeFevre; David M. Cwiertny;

  • 作者单位

    Department of Chemical & Biochemical Engineering University of Iowa Iowa City Iowa 52242 United States;

    IIHR-Hydroscience & Engineering and Department of Civil & Environmental Engineering University of Iowa Iowa City Iowa 52242 United States;

    IIHR-Hydroscience & Engineering University of Iowa Iowa City Iowa 52242 United States;

    Department of Civil & Environmental Engineering University of Iowa Iowa City Iowa 52242 United States;

    IIHR-Hydroscience & Engineering and Department of Civil & Environmental Engineering University of Iowa Iowa City Iowa 52242 United States;

    Strategic Laboratory Sciences Branch Laboratory & Analytical Services Division U.S. Geological Survey Denver Colorado 80225 United States;

    Central Midwest Water Science Center US. Geological Survey Iowa City Iowa 52240 United States;

    IIHR-Hydroscience & Engineering and Department of Civil & Environmental Engineering University of Iowa Iowa City Iowa 52242 United States;

    Department of Chemical & Biochemical Engineering IIHR-Hydrosctence & Engineering Center for Health Effects of Environmental Contamination Public Policy Center and Department of Civil & Environmental Engineering University of Iowa Iowa City Iowa 52242 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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