BEZERRA, E. D. G.; http://lattes.cnpq.br/9811896376528023; BEZERRA, Eriklys Darlan Gomes.
Abstract:
VLamellar Double Hydroxides (HDLs) are known as
allow a variety of anions among their coverslips to occupy. In literature
are known as anionic clays, correlation with cationic clays. The HDL
naturally occurring is known as hydrotalcite, but can be synthesized in the laboratory at
low cost, in various compositions and properties. The objective of this work was to produce
Mg - Al - NO 3 system HDLs, characterize them by X-ray Diffraction (XRD) and
Infrared spectroscopy (FTIR). The syntheses were performed by
co-precipitation at variable pH and constant pH. In the synthesis with decreasing variable pH constituted
addition of bivalent and trivalent cations (Mg 2+ and Al 3+) in a hydroxide solution of
ammonium. Already performed at constant pH, in addition to dripping the cation solution, another solution
of ammonium hydroxide was dripped concomitantly. The obtained HDLs were characterized by
DRX and FTIR held at the University's Fuel and Materials Laboratory (LACOM)
Federal of Paraíba (UFPB). XRDs showed the formation of crystalline compounds.
identified as HDLs in which the interlamellar anion is nitrate. Differences were noted
with regard to the method used, where HDL produced at variable pH was more
crystalline. FTIR analysis confirmed the presence of nitrate in the materials produced. The
results showed the efficiency of the method used, which avoids contamination by
carbonate intercalation. The many possibilities in the chemical composition of HDLs
Gives this class of materials wide range of application.