Microwave power effect on hydrotalcite synthesis

摘要

Hydrotalcite-like compounds,also referred as double layered hydroxides,are anionic clay-like compounds.They are microporous minerals with a layered structure.As they are scarcely found in nature they are usually synthesized through co-precipitation methods.A remarkable improvement in time and solution concentrations has been attained by microwaving the synthesis solutions.The obtained materials are original and different from those provided by the co-precipitation method.In this work,we correlate the features of the obtained hydrotalcite-like compounds,Mg/Al and Zn,Mg/Al,with the microwave intensity,the anion and cation nature,among others.When magnesium is incorporated at 200 W it remains in the outer layers of the hydrotalcite inhibiting the Zn diffusion which,then,forms zinc oxide.The irradiation power determines the homogeneity of the obtained materials as at 600 W the obtained hydrotalcite is more homogeneous than the one synthesized at 200 W.