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首页> 外文期刊>Environmental Science & Technology >Dispersion State and Humic Acids Concentration-Dependent Sorption of Pyrene to Carbon Nanotubes
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Dispersion State and Humic Acids Concentration-Dependent Sorption of Pyrene to Carbon Nanotubes

机译：P对碳纳米管的分散状态和腐殖酸浓度依赖性吸附

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摘要

Sonication and humic acids (HA) are known to disperse carbon nanotube (CNT) suspensions, but potential effects on sorption of chemicals to CNTs remain poorly understood. We applied a passive sampling method to investigate the influence of dispersion/aggregation on sorption of pyrene to CNTs. Sonication broke down CNT aggregates and increased pyrene sorption afHnity by up to 1.39 orders of magnitude. Sorption surfaces newly exposed by sonication remained available to pyrene even after reaggregation occurred, suggesting an irreversible effect of sonication. The presence of HA decreased sorption of pyrene to CNTs, but at the highest HA concentration investigated (200 mg/L), sorption affinity was still 1.90 orders of magnitude larger than sorption of pyrene to HA alone. Specific interactions between pyrene and CNTs were thus still taking place, in spite of the presence of a HA coating on the CNTs' surface. A greater suppression of sorption by CNTs occurred when the HA addition was combined with a sonication pretreatment.Sorption isotherm fitting indicated that the maximum sorption capacity, sorption affinity, and heterogeneity of the CNT surface were all affected by sonication and the presence of HA at a concentration as low as 1 mg/L. The present results contribute to an improved understanding of the sorption behavior of CNTs in both natural and wastewater systems.
机译：超声处理和腐殖酸（HA）可以分散碳纳米管（CNT）悬浮液，但是对化学物质吸附到CNT上的潜在影响仍然知之甚少。我们应用被动采样方法来研究分散/聚集对of对CNT吸附的影响。超声处理使CNT聚集体破裂，and吸附能力提高了1.39个数量级。通过声处理新暴露的吸附表面即使在发生重聚集后仍可用于pyr，这表明声处理具有不可逆的作用。 HA的存在降低了of对CNT的吸附，但是在研究的最高HA浓度（200 mg / L）下，吸附亲和力仍比of对HA的吸附大1.90个数量级。尽管在CNT的表面上存在HA涂层，但是coating与CNT之间仍发生特定的相互作用。当HA的加入和超声预处理结合时，CNTs的吸附受到更大的抑制。吸附等温线拟合表明，最大的吸附能力，吸附亲和力和CNT表面的异质性都受超声处理和HA的存在的影响。浓度低至1 mg / L。目前的结果有助于增进对天然和废水系统中碳纳米管吸附行为的了解。

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  • 来源
    《Environmental Science & Technology》 |2012年第13期|p.7166-7173|共8页
  • 作者

    Xiaoran Zhang; Melanie Kah; Michiel T. O. Jonker; Thilo Hofmann;

  • 作者单位

    Department of Environmental Geosciences, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria;

    Department of Environmental Geosciences, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria;

    Institute for Risk Assessment Sciences, Utrecht University, P.O. Box 80177, 3508 TD Utrecht, The Netherlands;

    Department of Environmental Geosciences, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria;

  • 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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