Zhang Xiao-Sa, Xiang Hong, Li Wen-Ze, Li Ying-Ying, Ma Xiang-Rong, Yang Ze-Zhou, Liu Yu
College of Science, Shenyang University of Chemical Technology Shenyang 110142 P. R. China
RSC Adv. 2021 Oct 7;11(52):33102-33113. doi: 10.1039/d1ra06701j. eCollection 2021 Oct 4.
The synthesis of multi-walled carbon nanotubes (MWCNTs) was carried out over different Ni-loaded metallic oxide catalyst nanoparticles and under different reduction times to control the outside diameter of the nanotubes. Moreover, high-purity, free-standing membranes were fabricated by a simple filtration of the as-grown MWCNTs. Furthermore, the dye-adsorption properties of the nanotubes depended on the diameter of the carbon nanotubes (CNTs). The adsorption isotherms and kinetics of anionic dyes could be described by Freundlich and pseudo-second-order models, respectively. Thermodynamic studies suggested that the adsorption processes were spontaneous and exothermic. This work provides new insights into the synthesis and application of MWCNTs with the selective adsorption properties of carbon-based materials for the removal of organic dyes.
多壁碳纳米管（MWCNTs）的合成是在不同负载镍的金属氧化物催化剂纳米颗粒上进行的，并在不同的还原时间下进行，以控制纳米管的外径。此外，通过对生长后的MWCNTs进行简单过滤制备了高纯度的独立膜。此外，纳米管的染料吸附性能取决于碳纳米管（CNTs）的直径。阴离子染料的吸附等温线和动力学分别可以用Freundlich模型和准二级模型来描述。热力学研究表明，吸附过程是自发的且放热的。这项工作为具有碳基材料选择性吸附特性的MWCNTs的合成及应用提供了新的见解，用于去除有机染料。
