Synthesis and Characterization of Hydrotalcite at Different Mg/Al Molar Ratios

Synthesis and characterization of Mg-Al hydrotalcite have been studied. Synthesis of Mg-Al hydrotalcite was carried out using co-precipitation method at constant pH followed by hydrothermal treatment at 110 °C for 12 hours. The effect of Mg/Al molar ratios 2:1 and 3:1 was investigated by using XRD, FTIR, and SEM-EDX. The results showed that these synthesized samples were identical to hydrotalcite materials based on X-ray diffractogram and FTIR spectra. The XRD patterns exhibit sharp reflection with high intensity with characteristic basal spacing at 11-23°, broad and asymmetric peaks at 34-66°. The FTIR spectra for the synthesized samples are in good agreement with slight shifting peaks at certain wavenumber characteristic of hydrotalcite. The morphologies of synthesized samples were shown by SEM and particles were formed as an accumulation of primary nanoparticles. Meanwhile chemical composition of the final products showed that Mg/Al ratio didn’t meet the theoretical value because the reaction under optimum pH. In general it is showed that molar ratio affected on the structure and material properties of synthesized hydrotalcite.