Síntese e caracterização de Hidróxidos Duplos Lamelares do sistema Cu, Zu, AlCO3.

Abstract

Anionic clays represent a class of natural or synthetic compounds that have lamellar structures with generally solvated anionic species occupying the interlamellar domain. The term Lamellar Double Hydroxides has been more used nowadays to refer to these materials, they are also known as compounds of the Hydrotalcite type, represented by the general formula [M2+ 1x M3+ x (OH)2]x+ Anx/ n .mH2O in which M2+ represents the bivalent cation, M3+ the trivalent cation, An interlamellar anion, x the molar ratio M3+/ (M2++M3+) in represents the amount of water molecules. In this work, HDL compounds containing Cu, Zn, Al and CO32 were produced and some properties were analyzed, such as the possible symmetry of the structure formed. The synthesis method used was by direct means, through coprecipitation at variable pH. The analyzes carried out for the characterization of the materials were X-ray diffraction and spectroscopy in the infrared region. Through the Bragg equation, some basal spacings were calculated in order to compare with the patterns found in the literature. One of the solids produced showed some structural differences, attributed to the final pH of synthesis. However, good results were obtained when compared to the already established reference data.