Journal
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
Volume 22, Issue -, Pages 373-377Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2014.07.034
Keywords
Carbon nanotubes; Magnetic separation; Sudan dyes; Adsorption
Funding
- Fundamental Research Funds for the Central Universities [2572014EB06]
- Northeast Forestry University Student Research Training Program [KY2013018]
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In this study, magnetic carbon nanotubes (MCNTs) have been synthesized by hydrothermal synthesis of Fe3O4 nanoparticles onto carbon nanotubes, and characterized by Fourier transform infrared spectroscopy, transmission electron microscope and physical property measurement system. They were used as adsorbents for the removal of sudan I, sudan II, sudan III, and sudan IV from aqueous solution. The effects of experimental parameters on adsorption were fully studied. The results showed that 5 mg MCNTs can remove sudan dyes sufficiently from 20 mL aqueous solution within 60 min at pH in the range of 4-7. Moreover, the existence of NaCl favored the adsorption. The sorbents can be reused more than ten times with 2% acetic acid ethanol as desorption solution. The equilibrium, kinetic and thermodynamic studies were investigated. The resultant kinetic data were well described by the pseudo-second-order model. The Freundlich model fitted sudan dyes sorption isotherms better than the Langmuir model. The thermodynamic data calculated from the temperature dependent sorption isotherms demonstrated that sudan dyes sorption on the MCNTs was a spontaneous process. (C) 2014 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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