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首页> 外文期刊>Environmental Science & Technology >Adsoration of polycyclic aromatic hydrocarbons by carbon nanomaterials
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Adsoration of polycyclic aromatic hydrocarbons by carbon nanomaterials

机译：碳纳米材料对多环芳烃的吸附

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Carbon nanomaterials are novel manufactured materials, having widespread potential applications. Adsorption of hydrophobic organic compounds (HOCs) by carbon nanomaterials may enhance their toxicity and affect the fate, transformation, and transport of HOCs in the environment. In this research, adsorption of naphthalene, phenanthrene, and pyrene onto six carbon nanomaterials, including fullerenes, single-walled carbon nanotubes, and multiwalled carbon nanotubes was investigated, which is the first systematic study on polycyclic aromatic hydrocarbons (PAHs) sorption by various carbon nanomaterials. All adsorption isotherms were nonlinear and were fitted well by the Polanyi-Manes model (PMM). Through both isotherm modeling and constructing "characteristic curve", Polanyi theory was useful to describe the adsorption process of PAHs by the carbon nanomaterials. The three fitted parameters (Q(0), a, and b) of PMM depended on both PAH properties and the nature of carbon nanomaterials. For different PAHs, adsorption seems to relate with their molecular size, i.e., the larger the molecular size, the lower the adsorbed volume capacity (Q(0)), but higher a and b values. For different carbon nanomaterials, adsorption seems to relate with their surface area, micropore volume, and the volume ratios of mesopore to micropore. Quantitative relationships between these sorbent properties and the estimated parameters of PMM were obtained. These relationships may represent a first fundamental step toward establishing empirical equations for quantitative prediction of PAH adsorption by carbon nanomaterials and possibly other forms of carbonaceous (geo-) sorbents, and for evaluating their environmental impact. In addition, high adsorption capacity of PAHs by carbon nanotubes may add to their high environmental risks once released to the environment, and result in potential alteration of PAHs fate and bioavailability in the environment.
机译：碳纳米材料是新颖的制造材料，具有广泛的潜在应用。碳纳米材料对疏水性有机化合物（HOC）的吸附可能会增强其毒性，并影响HOC在环境中的命运，转化和运输。在这项研究中，研究了萘，菲和pyr在六种碳纳米材料（包括富勒烯，单壁碳纳米管和多壁碳纳米管）上的吸附，这是对各种碳吸附多环芳烃（PAHs）的首次系统研究。纳米材料。所有吸附等温线都是非线性的，并且可以通过Polanyi-Manes模型（PMM）很好地拟合。通过等温线建模和构造“特征曲线”，波兰尼理论对描述碳纳米材料对多环芳烃的吸附过程是有用的。 PMM的三个拟合参数（Q（0），a和b）取决于PAH特性和碳纳米材料的特性。对于不同的PAH，吸附似乎与它们的分子大小有关，即分子大小越大，吸附的体积容量（Q（0））越低，但a和b值越高。对于不同的碳纳米材料，吸附似乎与它们的表面积，微孔体积以及中孔与微孔的体积比有关。获得了这些吸附剂性能与PMM估计参数之间的定量关系。这些关系可能是迈出建立经验方程式的第一步，该方程式是用于定量预测碳纳米材料和可能的其他形式的碳质（地质）吸附剂对PAH吸附的定量以及评估其环境影响的基础。此外，碳纳米管对PAHs的高吸附能力一旦释放到环境中，可能会增加其高环境风险，并导致PAHs命运和环境中生物利用度的潜在变化。

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