Synthesis of gallic acid intercalated Mg/aL-hydrotalcite by direct co-precipitation method and its application to adsorption of Au(III)

Intercalation of gallic acid (GA) on Mg/Al-HT has been performed by direct co-precipitation method of Mg(NO<inf>3</inf>)<inf>2</inf>, Al(NO<inf>3</inf>)<inf>2</inf> and GA at various molar ratios. The intercalation products of GA in Mg/Al-HT-GA were characterized by infrared spectrophotometer and XRD diffractometer. The effects of molar ratio variations on the synthesis of Mg/Al-HT-GA and adsorption capacity of Au(III) were also studied. The analysis using an infrared spectrometer and XRD diffractometer showed that GA had been intercalated in the interlayer of Mg/Al-HT with the value of d (basal spacing d<inf>003</inf>) increased with increasing of the concentration of GA. The adsorption of Au(III) by Mg/Al-HT-GA synthetized was optimum at pH 10 and variation of Mg:Al:GA=2:1:0.5 with the adsorption capacity of 90.1. © 2020 Elsevier B.V., All rights reserved.