Abstract

Carbonaceous materials are considered as potential adsorbents for organic dyes due to their unique structures which provide high aspect ratios, hydrophobic property, large efficient surface area, and easy surface modification. In this work, graphene nanoribbons (GNRs) were prepared by atomic hydrogen-induced treatment of single-walled carbon nanotube (SWCNTs), which inspire the idea of cutting and unzipping the SWCNTs carpets with the modified in molecules prevent because of the unfolding of the side-walls. The unfolded spaces and uniform vertical arrangement not only enhance the active surface area, but also promote the electrostatic and π–π interactions between dyes and GNRs. The improved adsorption capacity of GNRs beyond original SWCNTs can be determined by the adsorption kinetics and isotherm, which are evaluated through adsorption batch experiments of the typical cationic methylene blue (MB) and anionic orange II (OII) dye, respectively. It is shown that the adsorption kinetics follow a pseudo second-order model while the adsorption isotherm could be determined by Langmuir model. The results reveal that the maximum adsorption capacities of GNRs for MB and OII are 280 and 265 mg/g, respectively. The GNRs present the highly efficient, cost effective, and environmental friendly properties for the commercial applications of wastewater treatment.

Graphic abstract

中文翻译：

---

使用原子氢诱导的单壁碳纳米管地毯形成的石墨烯纳米带对阳离子染料和阴离子染料进行高效吸附

摘要

碳质材料因其独特的结构而被认为是有机染料的潜在吸附剂，它们具有高的长宽比，疏水性，大的有效表面积和易于表面修饰的特性。在这项工作中，通过原子氢诱导的单壁碳纳米管（SWCNT）的处理制备了石墨烯纳米带（GNR），这激发了用分子修饰的SWCNTs地毯进行切割和拉开拉链的想法，这是因为侧壁。展开的空间和均匀的垂直排列不仅增加了有效表面积，而且还促进了静电和π – π染料和GNR之间的相互作用。可以通过吸附动力学和等温线来确定超越原始SWCNT的GNR吸附能力，这分别通过典型的阳离子亚甲基蓝（MB）和阴离子橙II（OII）染料的吸附批实验进行评估。结果表明，吸附动力学遵循伪二级模型，而吸附等温线可以通过Langmuir模型确定。结果表明，GNRs对MB和OII的最大吸附容量分别为280和265 mg / g。GNR为废水处理的商业应用提供了高效，经济高效和环境友好的特性。

图形摘要