Influence of 2,4-D concentration in the 2,4-D/LDH hybrid nanocomposite synthesis used as controlled release formulation

• DOI: https://doi.org/10.22533/at.ed.909122430106

• Palavras-chave: -

• Keywords: 2,4-D, hybrid composites, coprecipitation method, influence of 2,4-D concentration, layered double hydroxides.

• Abstract: The synthesis of the 2,4-D/LDH hybrid nanocomposite, a novel approach, was carried out using the direct coprecipitation method at three different concentrations of 2,4-D (0.10, 0.20, and 0.40 mol/L). The X-ray diffraction and infrared spectra analyses confirmed the successful incorporation 2,4-D into the ZnAl-LDH matrix at the chosen concentrations. The insertion of 2,4-D into the interlayer increased the basal spacing from 7.8 Å to values above 23 Å. The higher the herbicide concentration, the more 2,4-D was introduced, resulting in increased crystallinity and a higher herbicide release capacity at equilibrium. The release of 2,4-D was primarily governed by the ion exchange mechanism between carbonate ions in solution and interlayer 2,4-D, and the pseudo- second-order kinetic model best described the release profile.