Adsorption of 2,4-dichlorophenoxyacetic acid from aqueous solution using organo-modified bentonite clay

Abstract

A laboratory experiment was 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 showed that the organically modified bentonite absorbed 4.5 times more 2.4-D compared to the unmodified Na-Ca bentonite, indicating 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 were found 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 to create new formulations, should be considered only after a thorough evaluation of the toxic effects of the organoclay on nontarget organisms.

References

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