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首页> 外文期刊>Environmental Science & Technology >Sorption of Peat Humic Acids to Multi-Walled Carbon Nanotubes
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Sorption of Peat Humic Acids to Multi-Walled Carbon Nanotubes

机译：泥炭腐殖酸对多壁碳纳米管的吸附

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摘要

Sorption of humic acids (HAs) from a peat soil by multiwalled carbon nanotubes (MWCNTs) was examined in this work. Sorption rate of HAs to MWCNTs was dominantly controlled by their diffusion from liquid-MWCNT boundary to MWCNT surfaces. Size exclusion chromatography analysis did not detect preferential sorption of HA fractions to MWCNTs at equilibrium, whereas the components with lower molecular weight in some HA fractions (e.g., HAI) would more preferentially be sorbed to MWCNTs at the initial sorption stage. Equilibrium sorption intensity of HAs by MWCNTs was dependent on their surface area and a sum of meso- and macropore volume. The surface area and sum of meso- and macroporosity-normalized sorption coefficient (Kd) values of a given HA by MWCNTs increased with increasing outer diameter of MWCNTs, because MWCNTs with larger outer diameter were more strongly dispersed by HAs thereby making more sorption sites exposed for HA sorption. Van der Waals interaction between the alkyl components rather than the aromatic ones of HAs with MWCNTs was likely the key driving force for their sorption. This study highlights the sorption rate-controlling step of HAs from a same source to MWCNTs and the major factors affecting their sorption intensity at equilibrium.
机译：在这项工作中，研究了通过多壁碳纳米管（MWCNT）从泥炭土壤中吸附腐殖酸（HAs）。 HAs对MWCNTs的吸附速率主要受HAs从液态MWCNT边界扩散到MWCNT表面的控制。尺寸排阻色谱分析未检测到平衡时HA组分优先吸附于MWCNT，而某些HA组分（例如HAI）中分子量较低的组分在初始吸附阶段将更优先吸附于MWCNT。 MWCNTs对HAs的平衡吸附强度取决于其表面积以及中孔和大孔体积的总和。给定HA通过MWCNT的表面积以及中孔和大孔归一化吸附系数（Kd）值的总和随MWCNT外径的增加而增加，因为外径较大的MWCNT被HA分散的更强，从而使更多的吸附位点暴露用于HA吸附。 MWCNTs的HA的烷基组分之间而不是芳族组分之间的范德华相互作用可能是其吸附的主要推动力。这项研究强调了HAs从相同来源到MWCNTs的吸附速率控制步骤，以及在平衡状态下影响其吸附强度的主要因素。

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  • 来源
    《Environmental Science & Technology》 |2011年第21期|p.9276-9283|共8页
  • 作者

    Xilong Wang; Liang Shu; Yanqi Wang; Bingbing Xu; Yingchen Bai; Shu Tao; Baoshan Xing;

  • 作者单位

    Laboratory for Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing, 100871, China;

    Laboratory for Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing, 100871, China;

    Laboratory for Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing, 100871, China;

    Chinese Research Academy of Environmental Sciences, Beijing, 100012, China;

    Chinese Research Academy of Environmental Sciences, Beijing, 100012, China;

    Laboratory for Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing, 100871, China;

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