Comparison of Different Synthesis Ways for Mg–Al- Layered Double Hydroxides (LDH), Effects of Ultrasound Treatment and Characterization of the Structural Phases by Rietveld Refinement

Layered Double Hydroxides (LDH), anionic clays, is a family of compounds which have attracted considerable attention in recent years[1-4] such as catalysis[5], adsorption[6], ion exchange[7], biomedical application[8] and Defluoridation Capacity (DC)[9]. The structure of most of these materials corresponds to that of hydrotalcite[10]. LDHs are characterized by the general formula [M1-xM III x(OH)2] [Xn/x n-m H2O] x-, symbolized by [MIIMIIIXn-], where MII and MIII are the diand trivalent cations and Xnis an exchangeable interlayer anion, notably (carbonate, nitrate, halides, complexes anions, oxo-anion, etc.)[11,12]. A large number of LDH are a combination with divalent Laboratory of the Physico-Chemistry of Solid States, LR11 ES51, University of Sfax, Road of Soukra km 4, Sfax3038, Tunisia