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Abstract <p>A laboratory experiment has been carried out to investigate the sorption behavior of 2,4-D onto two types of bentonite material: Na–Ca bentonite and organically modified bentonite (HDTMA-Br) using hexadecyltrimethylammonium bromide. The amount of HDTMA-Br was equivalent to the cation exchange capacity of the dominant mineral, montmorillonite, in the bentonites. The results have shown that the organically modified bentonite absorbed 4.5 times more 2,4-D than the unmodified Na–Ca bentonite, which indicates a significantly stronger sorption affinity for the organic cation. This finding suggests that organically modified bentonites may be more effective for the removal of 2,4-D from contaminated soil or water. In the range of pH values between 4 and 6, the sorption sites on the hydrophobic surface of organobentonite proved to have a relatively uniform energy for 2,4-d molecules (Freundlich constant <i>n</i> ≈ 0.8). Hydrophobic interactions were the dominant mechanism for the uptake of 2,4-D at these pH values. The possibility of using HDTMA-bentonite to reduce the mobility of 2,4-D in soils and landscapes or create new formulations should be considered only after a thorough evaluation of the toxic effects of organoclay on nontarget organisms.</p>

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Adsorption of 2,4-Dichlorophenoxyacetic Acid from Water Solution Using Organo-Modified Bentonite Clay

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • A. A. Astaykina,
  • I. I. Tolpeshta,
  • Yu. G. Izosimova,
  • R. A. Streletskii

摘要

Abstract

A laboratory experiment has been carried out to investigate the sorption behavior of 2,4-D onto two types of bentonite material: Na–Ca bentonite and organically modified bentonite (HDTMA-Br) using hexadecyltrimethylammonium bromide. The amount of HDTMA-Br was equivalent to the cation exchange capacity of the dominant mineral, montmorillonite, in the bentonites. The results have shown that the organically modified bentonite absorbed 4.5 times more 2,4-D than the unmodified Na–Ca bentonite, which indicates a significantly stronger sorption affinity for the organic cation. This finding suggests that organically modified bentonites may be more effective for the removal of 2,4-D from contaminated soil or water. In the range of pH values between 4 and 6, the sorption sites on the hydrophobic surface of organobentonite proved to have a relatively uniform energy for 2,4-d molecules (Freundlich constant n ≈ 0.8). Hydrophobic interactions were the dominant mechanism for the uptake of 2,4-D at these pH values. The possibility of using HDTMA-bentonite to reduce the mobility of 2,4-D in soils and landscapes or create new formulations should be considered only after a thorough evaluation of the toxic effects of organoclay on nontarget organisms.