Elimination of the pesticide 2,4-D by synthesized anion clays starting from marine water

The layered double hydroxide (LDH) is synthesis from seawater. We studied as potential adsorbents of organic pollutant: herbicide 2,4-D. The adsorption tests were carried out in aqueous medium under air atmosphere, taking into account the effect of some experimental factor, ie as the calcination temperature, contact time, pH, ratio adsorbent / adsorbate and charge density. The results show that the calcined LDH possessed a very high adsorption capacity, and that the adsorption kinetics of 2.4-D by calcined LDH is fast (equilibrium is reached after 20 minutes of contact). The adsorption isotherm of 2,4-D by calcined LDH is the type S. This type of isotherm confirms the weak interaction between the solute molecules and the adsorbent.