Amino-Functionalized Multi-Walled Carbon Nanotubes as Novel Adsorbents for Selective Adsorption of Anionic Dyes in Aqueous Solution

作者：Huang, Hui^*; Yu, Jingang; Liu, Wei; Jiang, Xinyu

来源：Nano, 2015, 10(5): 1550065.

DOI：10.1142/S1793292015500654

• Amino
• carbon nanotubes
• adsorption
• anionic dyes
• Methyl orange

In this study, amino-functionalized multi-walled carbon nanotubes (MWCNTs-NH2) were successfully synthesized via an improved method and used for removal of organic dyes in aqueous solution. The synthesized MWCNTs-NH2 were characterized by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), scanning electron microscope (SEM), etc. The adsorption capacity and selectivity of MWCNTs-NH2 for organic dyes was evaluated using rhodamine B (RhB), malachite green (MG), methyl orange (MO) and congo red (CR) as models. The selective adsorption toward anionic dyes was found for the MWCNTs-NH2, and MO was selected as a typical anionic dye to deeply investigate the adsorption kinetics, equilibrium isotherms and thermodynamic parameters of the adsorption process. The adsorption kinetics and equilibrium isotherms data fitted well with the pseudo-second-order kinetic equation and Langmuir isotherm model. The thermodynamics study revealed that the adsorption of MO onto MWCNTs-NH2 was spontaneous, exothermic and physisorptive in nature. The results indicated that MWCNTs-NH2 are promising nanomaterials for removal of anionic dyes from industrial wastewater.

• 单位
  中南大学