Department of Civil Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia.
Department of Civil Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia.
J Environ Manage. 2019 Apr 1;235:521-534. doi: 10.1016/j.jenvman.2019.01.070. Epub 2019 Feb 1.
In this study two deep eutectic solvents (DESs) were prepared using ethylene glycol (EG) and two different ammonium-based salts. The potential of these DESs as novel agents for CNTs functionalization was examined by performing a comprehensive characterization study to identify the changes developing after the functionalization process. The impact of DESs was obvious by increasing the surface area of CNTs to reach 197.8 (m/g), and by adding new functional groups to CNTs surface without causing any damage to the unique structure of CNTs. Moreover, CNTs functionalized with DESs were applied as new adsorbents for the removal of methyl orange (MO) from water. The adsorption conditions were optimized using RSM-CCD experimental design. The kinetics and the equilibrium adsorption data were analyzed using different kinetic and isotherm models. According to the regression results, adsorption kinetics data were well described by pseudo-second order model, whereas adsorption isotherm data were best represented by Langmuir isotherm model. The highest recorded maximum adsorption capacity (q) value was found to be 310.2 mg/g.
在这项研究中，使用乙二醇（EG）和两种不同的铵基盐制备了两种深共晶溶剂（DESs）。通过进行全面的表征研究来检查这些 DESs 作为 CNTs 功能化的新型试剂的潜力，以确定功能化过程后发生的变化。DESs 的影响是明显的，它增加了 CNTs 的表面积，达到 197.8（m/g），并在不破坏 CNTs 独特结构的情况下在 CNTs 表面添加了新的功能基团。此外，用 DESs 功能化的 CNTs 被用作从水中去除甲基橙（MO）的新型吸附剂。使用 RSM-CCD 实验设计优化了吸附条件。使用不同的动力学和等温线模型分析了动力学和平衡吸附数据。根据回归结果，吸附动力学数据很好地由伪二阶模型描述，而吸附等温线数据由朗缪尔等温线模型最好地表示。记录到的最高最大吸附容量（q）值为 310.2 mg/g。
