Alkaline earth metal substitution effects in sol-gel–derived mixed metal oxides and Mg 2-x M x /Al 1 (M = Ca, Sr, Ba)–layered double hydroxides

摘要: Layered double hydroxides (LDHs) are anionic clays with unique physical and chemical properties. In this study, an indirect sol-gel synthesis method was applied to prepare alkaline earth metal–substituted layered of Mg2-xMx/Al1 (M = Ca, Sr, Ba). the processing, metal nitrates Mg(NO3)2·6H2O, Al(NO3)3·9H2O, Ca(NO3)2·4H2O, Sr(NO3)2 Ba(NO3)2 dissolved in deionized water were used as starting materials; citric acid monohydrate 1,2-ethanediol complexing agents. The mixed oxides (MMOs) obtained after thermal treatment precursor gels at 650 °C subsequently reconstructed LDHs. products characterized using X-ray powder diffraction (XRD) analysis scanning electron microscopy (SEM). Nitrogen adsorption by Brunauer, Emmet Teller (BET) Barret determine surface area pore diameter synthesized MMO materials. It demonstrated for first time that formation Ba) LDH from sol-gel–derived powders depends significantly on nature concentration metal.