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  • Title: Removal of methylene blue from aqueous solution with magnetite loaded multi-wall carbon nanotube: kinetic, isotherm and mechanism analysis.
    Author: Ai L, Zhang C, Liao F, Wang Y, Li M, Meng L, Jiang J.
    Journal: J Hazard Mater; 2011 Dec 30; 198():282-90. PubMed ID: 22040800.
    Abstract:
    In this study, we have demonstrated the efficient removal of cationic dye, methylene blue (MB), from aqueous solution with the one-pot solvothermal synthesized magnetite-loaded multi-walled carbon nanotubes (M-MWCNTs). The as-prepared M-MWCNTs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) spectroscopy. The effects of contact time, initial dye concentration, and solution pH on the adsorption of MB onto M-MWCNTs were systematically studied. It was shown that the MB adsorption was pH-dependent. Adsorption kinetics was best described by the pseudo-second-order model. Equilibrium data were well fitted to the Langmuir isotherm model, yielding maximum monolayer adsorption capacity of 48.06 mg g(-1). FTIR analysis suggested that the adsorption mechanism was possibly attributed to the electrostatic attraction and π-π stacking interactions between MWCNTs and MB.
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