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Very fast sorbent for organic dyes and pollutants

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Abstract

The increasing use of organic compounds endangering the environment encourages search for more efficient sorbents. While crude clay minerals are effective for the adsorption of cations, modified organoclays may adsorb negative and hydrophobic molecules. In this short communication, we present a very fast adsorbing organoclay based on montmorillonite with crystal violet pre-adsorbed up to neutralization of the negative charges. Sorption of erythrosin-B and 2,4,5-trichlorophenol to such organoclay reaches equilibrium in less than a minute, whereas with activated carbon, it took tens of minutes. The pseudo second-order kinetic coefficient for the process was at least two orders of magnitude smaller for the organoclay. Because sorption kinetics is an important factor in water purification, such fast sorbent might have broad environmental applications.

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Fig. 1
Fig. 2

Abbreviations

AC :

High quality powdered activated carbon

CEC :

Cation exchange capacity

CV :

Crystal violet

EB :

Erythrosin-B, 2′,4′,5′,7′-Tetraiodofluorescein disodium salt

M100 :

Motmorillonite SWy-1 with CV adsorbed up to 100% of the CEC

TCP :

2,4,5-trichlorophenol

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Acknowledgement

This study was supported in part by the Israel Science Foundation, grant 849/05.

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Authors and Affiliations

  1. Tel Hai Academic College, Department of Biotechnology and Environmental Sciences, School of Sciences, Upper Galilee, 12210, Israel

    Giora Rytwo & Yotam Gonen

Authors
  1. Giora Rytwo
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  2. Yotam Gonen
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Correspondence to Giora Rytwo.

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Rytwo, G., Gonen, Y. Very fast sorbent for organic dyes and pollutants. Colloid Polym Sci 284, 817–820 (2006). https://doi.org/10.1007/s00396-006-1467-x

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  • DOI: https://doi.org/10.1007/s00396-006-1467-x

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