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Adsorption of Hydroxyl- and Amino-Substituted Aromatics to Carbon Nanotubes

机译：羟基和氨基取代的芳烃对碳纳米管的吸附

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摘要

The combined effects of hydroxyl/amino functional groups of aromatics and surface O-containing groups of carbon nanotubes on adsorption were evaluated. When normalized for hydro-phobicity, 2,4-dichlorophenol and 2-naphthol exhibited a greater adsorptive affinity to carbon nanotubes and graphite (a model adsorbent without the surface 0 functionality) than structurally similar 1,3-dichlorobenzene and naphthalene, respectively, and 1-naphthylamine exhibited a much greater adsorptive affinity than all other compounds. Results of the pH-dependency experiments further indicated that the hydroxyl/ amino functional groups of the adsorbates and the surface properties of the adsorbents played a combinational role in determining the significance of the nonhydrophobic adsorptive interactions. We propose that the strong adsorptive interaction between hydroxyl-substituted aromatics and carbon nanotubes/ graphite was mainly due to the electron-donating effect of the hydroxyl group, which caused a strong electron-donor-acceptor (EDA) interaction between the adsorbates and the Tt-electron-depleted regions on the graphene surfaces of carbon nanotubes or graphite. In addition to the EDA interaction, Lewis acid-base interaction was likely an extra important mechanism contributing to the strong adsorption of 1-naphthylamine, especially on the O-functionality-abundant carbon nanotubes. The findings of the present study might have significant implications for selective removal of environmental contaminants with carbon nanotubes.
机译：评价了芳族化合物的羟基/氨基官能团和碳纳米管的表面含O基团对吸附的联合作用。当标准化疏水性时，与结构相似的1,3-二氯苯和萘相比，2,4-二氯苯酚和2-萘酚分别对碳纳米管和石墨（无表面0官能度的模型吸附剂）表现出更大的吸附亲和力，并且1-萘胺比所有其他化合物表现出更大的吸附亲和力。 pH依赖性实验的结果进一步表明，被吸附物的羟基/氨基官能团和吸附剂的表面性质在确定非疏水性吸附相互作用的重要性方面起着组合作用。我们认为，羟基取代的芳族化合物与碳纳米管/石墨之间的强吸附性相互作用主要是由于羟基的供电子作用，这导致了被吸附物与Tt之间的强电子给体-受体（EDA）相互作用。 -碳纳米管或石墨的石墨烯表面上的电子耗尽区域。除EDA相互作用外，路易斯酸碱相互作用可能是促进1-萘胺（尤其是在O功能丰富的碳纳米管上）强烈吸附的一个重要机制。本研究的发现可能对用碳纳米管选择性去除环境污染物具有重要意义。

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