Adsorption kinetics of aromatic compounds on carbon nanotubes and activated carbons

Authors

  • Shujuan Zhang,

    1. State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, People's Republic of China
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  • Ting Shao,

    1. Department of Environmental Engineering and Earth Sciences, Clemson University, Anderson, South Carolina, USA
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  • H. Selcen Kose,

    1. Department of Environmental Engineering and Earth Sciences, Clemson University, Anderson, South Carolina, USA
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  • Tanju Karanfil

    Corresponding author
    1. Department of Environmental Engineering and Earth Sciences, Clemson University, Anderson, South Carolina, USA
    • Department of Environmental Engineering and Earth Sciences, Clemson University, Anderson, South Carolina, USA.

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Abstract

Adsorption kinetics of two organic compounds on four types of carbonaceous adsorbents (a granular activated carbon [HD4000], an activated carbon fiber [ACF10], a single-walled carbon nanotube [SWNT], and a multiwalled carbon nanotube [MWNT]) was examined in aqueous solutions. The times needed for the adsorption to reach apparent equilibrium on the four carbons followed the order of ACF10 > HD4000 > SWNT > MWNT. Ultrasonication of the carbon nanotubes (CNTs) accelerated their adsorption kinetics but had no effect on their equilibrium adsorption capacities. The pseudo-second order model (PSOM) provided good fitting for the kinetic data. The fitting of kinetic data with the intraparticle diffusion model indicated that external mass transfer controls the sorption process in the organic compound–CNT systems, whereas intraparticle diffusion dominates in the sorption of organic compounds onto activated carbons. Environ. Toxicol. Chem. 2012;31:79–85. © 2011 SETAC

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