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首页> 外文期刊>Environmental Science & Technology >Sorption of Organic Contaminants by Carbon Nanotubes: Influence of Adsorbed Organic Matter
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Sorption of Organic Contaminants by Carbon Nanotubes: Influence of Adsorbed Organic Matter

机译：碳纳米管对有机污染物的吸附：吸附有机物的影响

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摘要

Sorption of three types of dissolved organic matter (DOM; i.e., humic acid, peptone and α-phenylalanine) by a mutiwalled carbon nanotube (MWNT40) and sorption of phenanthrene (Phen), naphthalene (Naph), and 1-naphthol (1-Naph) by the original and DOM-coated MWNT40 were examined. Sorption data of Phen, Naph, and 1-Naph by all sorbents were fitted with Freundlich and Polanyi models. MWNT40 had nonlinear isotherms for all DOMs examined. Sorption of DOMs by MWNT40 followed the order peptone > humic acid > a-phenylalanine. The humic acid used in this study had much lower sorption for Phen, Naph, and 1-Naph than MWNT40, but its coating did not make striking changes on sorption of these compounds by MWNT40, suggesting that humic acid coating dramatically altered the physical form and surface properties of MWNT40. Peptone coating made the strongest suppression on sorption of Phen, Naph, and 1-Naph by MWNT40 among the three DOMs used, due to its highest sorption on MWNT40, thus causing a great reduction in accessibility of sorption sites. Polanyi modeling results showed that reduction in the maximum volume sorption capacity (Q_0) of MWNT40 induced by DOM coating followed the order Phen < Naph < 1-Naph. 1-Naph was less hydrophobic than Phen and Naph but it had much higher sorbed volume (V_m) than Phen and Naph at individual RT In(S_w/C_e)/V_spoints for all sorbents. The correlation curve for the Polanyi model was applicable for sorption of aromatic compounds of similar structure by the original and DOM-coated carbon nanotubes.
机译：多壁碳纳米管（MWNT40）吸附三种类型的溶解有机物（DOM；腐殖酸，蛋白ept和α-苯丙氨酸），并吸附菲（Phen），萘（Naph）和1-萘酚（1- Naph）的原始和DOM涂层的MWNT40进行了检查。用Freundlich和Polanyi模型拟合所有吸附剂对Phen，Naph和1-Naph的吸附数据。 MWNT40具有针对所有检查的DOM的非线性等温线。 MWNT40对DOM的吸附遵循蛋白p>腐殖酸>α-苯丙氨酸的顺序。这项研究中使用的腐殖酸对苯酚，Naph和1-Naph的吸附量比MWNT40低得多，但其包覆层并未对MWNT40的这些化合物的吸附产生显着变化，这表明腐殖酸的包覆层显着改变了其物理形态和结构。 MWNT40的表面性质。蛋白used包衣在使用的三个DOM中对MWNT40的Phen，Naph和1-Naph的吸附具有最强的抑制作用，这是由于其对MWNT40的最高吸附，从而大大降低了吸附位点的可及性。 Polanyi建模结果表明，DOM涂层引起的MWNT40的最大体积吸附容量（Q_0）降低遵循Phen

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  • 来源
    《Environmental Science & Technology》 |2008年第9期|p.3207-3212|共6页
  • 作者

    XILONG WANG; JIALONG LU; BAOSHAN XING;

  • 作者单位

    Department of Plant, Soil and Insect Sciences, University of Massachusetts, Amherst, Massachusetts 01003;

  • 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 环境化学;
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