The knowledge of the sorption mechanism of different chemicals onto third generation carbon sorbents such as carbon nanotubes (CNTs) is needed in order to project systems for the effective removal of pollutants from the environment. This paper reports evaluation of the sorption mechanism of selected ionic liquids (ILs), being considered as potential pollutant in environment, onto various CNTs. CNTs characterized by the smallest diameter and the biggest surface area showed the highest sorption capacity to isolate ILs from an aqueous solution. CNTs with a bigger diameter, a functionalized surface and particularly a helical shape showed a lower sorption capacity. The sorption mechanism has been defined as complex, including van der Waals, π-π and electrostatic interactions with dominating π-π interactions. Due to the relatively high sorption coefficient (355.98 ± 20.69–6397.10 ± 355.42 L kg⁻¹ depending on the IL) the study showed that MWCNTs can potentially be used to effectively isolate ILs from an aqueous solution. Moreover, proved in this study, the fast sorption kinetic, and uncomplicated regeneration process, leading to an even higher sorption capacity means that CNTs are promising material which could find potential applications in the treatment of water contaminated by ILs.

中文翻译：

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评价离子液体在多壁碳纳米管上的吸附机理

为了设计用于从环境中有效去除污染物的系统，需要了解不同化学物质在第三代碳吸附剂（例如碳纳米管（CNT））上的吸附机理。本文报告了对被认为是环境中潜在污染物的选定离子液体（ILs）在各种CNT上的吸附机理的评估。以最小直径和最大表面积为特征的CNT表现出最高的吸附能力，可以从水溶液中分离出IL。具有较大直径，功能化表面，尤其是螺旋形状的CNT显示出较低的吸附能力。吸附机理已被定义为复杂的，包括范德华力，π-π和具有主要π-π相互作用的静电相互作用。^-1取决于IL），研究表明MWCNT可以潜在地用于从水溶液中有效分离IL。而且，在这项研究中证明，快速的吸附动力学和简单的再生过程，导致更高的吸附能力，意味着CNTs是有前途的材料，可以在处理被ILs污染的水中找到潜在的应用。