Interaction of aminotriazole with montmorillonite and Mg-vermiculite at pH 4

Abstract

The interaction of aminotriazole (AMT) at pH 4 on Wyoming montmorillonite (mainly with Na ions) and Mg-vermiculite has been studied by X-ray diffraction and infrared spectroscopy. The AMT is adsorbed on montmorillonite in the cationic form by cation exchange. The amount of pesticide adsorbed was 71 mEq/100 g, which comprises ~91% of the CEC of this sample (78.2 mEq/100 g). Saturation was reached in 24 h, giving rise to a complex with basal spacing 12.5 ,~. Vermiculite adsorbs 167 mEq/100 g,o almost 20% greater than the CEC (141 mEq/100 g), and the basal spacing was stabilized at 13.68 A after five weeks of treatment with AMT. A part of the AMT is adsorbed in cationic form, displacing a great part of the exchangeable Mg 2+ cations. The rest is adsorbed in molecular form by coordination to the Mg 2+ cations which remain in the interlamellar space, removing a great amount of water, and remaining in the interlamellar space of vermiculite after washing with water, probably because of a steric hindrance from the AMT cations adsorbed.

Influence of hydrophilicity on adsorption of caffeine onto montmorillonite

“…In the case of compounds having CN bonds such as acrylonitrile, it is reported that a dipole moment exists between CN groups and interlayer ions (Yamanaka et al, 1974(Yamanaka et al, , 1975. In the case of some organic compounds such as aminotriazole, it is suggested that not only is adsorption caused by dipole moments but also adsorption can be due to interactions between amino groups and interlayer ions of Mont and the resultant formation of complexes (Morillo et al, 1997;Serratosa, 1968). The sum of these studies show that not only interactions with the clay structure but also interactions with interlayer ions has an influence on the adsorption characteristics of organic compounds onto Mont and that there is a possibility that control of adsorption characteristics can be achieved by controlling the interlayer ions.…”