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Adsorption of Imazamox herbicide onto Filtrasorb 400 activated carbon

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Abstract

Imazamox is an imidazolinone herbicide, a new class of pesticides, which can exist as cationic, anionic or neutral species in water. The adsorption isotherms of Imazamox onto Filtrasorb 400 (F400) activated carbon were determined varying the pH and the ionic strength of the aqueous medium. The results show that ionic strength has no significant effect on Imazamox uptake, contrary to pH, and that F400 has a high affinity for Imazamox. Moreover, it is found that Imazamox adsorbs onto F400 as its neutral form. The best fit of the experimental points is obtained with the Langmuir–Freundlich model, consistent with surface site heterogeneity. Finally, calculating Langmuir–Freundlich isotherms for various constant pH values, it is shown that the two plateaus observed in the experimental isotherms obtained at free pH are due to the variation of the pH along the isotherms.

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Acknowledgments

The authors wish to thank Chemviron Carbon (European Operations of Calgon Carbon Corporation, USA) who kindly provided them with Filtrasorb 400 samples. The corresponding author also gratefully acknowledges kind encouragement from James Hickman, Director of the NanoScience Technology Center (NSTC, University of Central Florida, USA), during her stay at NSTC.

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Author notes

  1. Etienne Quivet

    Present address: Universités d’Aix-Marseille I, II et III, CNRS UMR 6264 (LCP), 3 place Victor Hugo, 13331, Marseille Cedex 3, France

Authors and Affiliations

  1. Université de Lyon, Université Claude Bernard Lyon 1, CNRS UMR 5256 (IRCELYON), 43 bd du 11 Novembre 1918, 69622, Villeurbanne Cedex, France

    Catherine Morlay, Michaela Pilshofer & Jean-Pierre Joly

  2. University of Central Florida, NanoScience Technology Center, 12424 Research Parkway, Orlando, FL, 32826, USA

    Catherine Morlay

  3. Université de Lyon, Université Claude Bernard Lyon 1, CNRS UMR 5180 (LSA), 43 bd du 11 Novembre 1918, 69622, Villeurbanne Cedex, France

    Etienne Quivet, Michaela Pilshofer & René Faure

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  1. Catherine Morlay
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  2. Etienne Quivet
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  3. Michaela Pilshofer
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  4. René Faure
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  5. Jean-Pierre Joly
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Correspondence to Catherine Morlay.

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Morlay, C., Quivet, E., Pilshofer, M. et al. Adsorption of Imazamox herbicide onto Filtrasorb 400 activated carbon. J Porous Mater 19, 79–86 (2012). https://doi.org/10.1007/s10934-011-9450-4

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  • DOI: https://doi.org/10.1007/s10934-011-9450-4

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