Near-infrared spectroscopy study for determination of adsorbed acetochlor in the organic and inorganic bentonites

NIR spectroscopy is used to determine acetochlor herbicide adsorption on Na-montmorillonite (NaP) and organically modified montmorillonite (NaOM). Both montmorillonites NIR spectra shows bands at 7061 and 6791 cm−1. Organo-montmorillonite is characterised by two emphasized bands at 5871 and 5667 cm−1 that are attributed to the fundamental overtones of the mid-IR bands at 2916 and 2850 cm−1. Bands at 6017 and 6013 cm−1 are attributed to acetochlor adsorbed to organo-montmorillonite and Na-montmorillonite, which is confirmed by X-ray powder diffraction (XRPD). Greater quantity of acetochlor is adsorbed to organo-clays compared to non-modified montmorillonite. Acetochlor poses high risk to environmental contamination. Organo-clays are the most useful for removing acetochlor from water and soil.

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► Organo-montmorillonite IR bands change position/intensity with acetochlor adsorption.
► Acetochlor replaced cation in the interlayer surface of organo-montmorillonite.
► Acetochlor adsorption is much higher in organo-clay compared to Na-montmorillonite.