首页> 外文期刊>Environmental Science & Technology >Carboxymethylcellulose Mediates the Transport of Carbon Nanotube—Magnetite Nanohybrid Aggregates in Water-Saturated Porous Media
【24h】

Carboxymethylcellulose Mediates the Transport of Carbon Nanotube—Magnetite Nanohybrid Aggregates in Water-Saturated Porous Media

机译:羧甲基纤维素介导水饱和多孔介质中碳纳米管-磁铁矿纳米杂化聚集体的运输。

获取原文
获取原文并翻译 | 示例
       

摘要

Carbon—metal oxide nanohybrids (NHs) are increasingly recognized as the next-generation, promising group of nanomaterials for solving emerging environmental issues and challenges. This research, for the first time, systematically explored the transport and retention of carbon nanotube—magnetite (CNT—Fe_3O_4) NH aggregates in water-saturated porous media under environmentally relevant conditions. A macromolecule modifier, carboxymethylcellulose (CMC), was employed to stabilize the NHs. Our results show that transport of the magnetic CNT—Fe_3O_4 NHs was lower than that of nonmagnetic CNT due to larger hydrodynamic sizes of NHs (induced by magnetic attraction) and size-dependent retention in porous media. Classical Derjaguin—Landau— Verwey—Overbeek (DLVO) theory can explain the mobility of NHs under varying experimental conditions. However, in contrast with colloid filtration theory, a novel transport feature—an initial lower and a following sharp—higher peaks occurred frequently in the NHs' breakthrough curves. The magnitude and location of both transport peaks varied with different experimental conditions, due to the interplay between variability of fluid viscosity and size-selective retention of the NHs. Promisingly, the estimated maximum transport distance of NHs ranged between ~0.38 and 46 m, supporting the feasibility of employing the magnetically recyclable CNT—Fe_3O_4 NHs for in situ nanoremediation of contaminated soil, aquifer, and groundwater.
机译:碳金属氧化物纳米混合材料(NHs)被越来越多地视为解决新兴环境问题和挑战的下一代有前途的纳米材料。这项研究首次系统地探索了在环境相关的条件下,碳纳米管-磁铁矿(CNT-Fe_3O_4)NH聚集体在水饱和的多孔介质中的迁移和保留。使用大分子改性剂羧甲基纤维素(CMC)稳定NH。我们的结果表明,由于较大的NHs流体动力学尺寸(由磁引力引起)和在多孔介质中的尺寸依存性,磁性CNT-Fe_3O_4 NHs的运输低于非磁性CNT。古典Derjaguin-Landau-Verwey-Overbeek(DLVO)理论可以解释NHs在不同实验条件下的迁移率。但是,与胶体过滤理论相反,NHs的突破曲线中经常出现新的迁移特征,即最初的较低峰和随后的尖峰-较高峰。由于流体粘度的变化和NHs的尺寸选择性保留之间的相互作用,两个传输峰的大小和位置随不同的实验条件而变化。有希望的是,NHs的估计最大传输距离在〜0.38至46 m之间,这支持了采用可磁循环的CNT-Fe_3O_4 NHs对污染的土壤,含水层和地下水进行原位纳米修复的可行性。

著录项

  • 来源
    《Environmental Science & Technology》 |2017年第21期|12405-12415|共11页
  • 作者单位

    National Research Council and National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 919 Kerr Research Drive, Ada, Oklahoma 74820, United States;

    National Research Council and National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 919 Kerr Research Drive, Ada, Oklahoma 74820, United States,Department of Environmental Engineering, Kyungpook National University, Buk-gu, Daegu 41566, South Korea;

    Department of Civil, Structural and Environmental Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States;

    Department of Civil, Structural and Environmental Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States;

    Groundwater, Watershed, and Ecosystem Restoration Division, National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 919 Kerr Research Drive, Ada, Oklahoma 74820, 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 13:58:06

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号