Characterization of Layered Double Hydroxides(Mg-Al-$CO_3$ systems) and Rehydration Reaction of Their Calcined Products in Aqueous Chromate Solution

층상이중수산화물(Mg-Al-$CO_3$ 체계)의 물리 · 화학적 특성규명 및 소성된 시료의 크롬산이온 수용액에서 재수화반응

  • Rhee, Seog Woo (Department of Chemistry, Korea Advanced Institute of Science and Technology) ;
  • Kang, Mun-Ja (Department of Chemistry, Korea Advanced Institute of Science and Technology) ;
  • Moon, Hichung (Korea Atomic Energy Research Institute)
  • Published : 19950800

Abstract

Layered double hydroxides ($Mg-Al-CO_3$ systems, LDH), which are hydrotalcite-like anionic clay minerals, having different $Mg^{2+}\;to\;Al^{3+}$ ratio were synthesized by coprecipitation method. The subsequent products were characterized by the following methods; elemental analysis, X-ray powder diffraction, thermal analysis (DSC and TGA), FT-IR and $^{27}$Al-MAS NMR. X-ray powder patterns showed that the products formed were layered structure materials. Two heat absorption peaks were observed around 20 ∼280$^{\circ}C$ (surface water and interlayer water) and 280∼500$^{\circ}C$ (water from lattice hydroxide and carbon dioxide from interlayer carbonate) in DSC diagrams, and they were quantitatively analyzed by TGA diagrams (in case LDH4 16.2% and 28.6% respectively). FT-IR spectra indicate that the interlayer carbonate ions occupied symmetrical sites between two adjacent layers in a parallel direction. $^{27}$Al-MAS NMR spectra show only single resonance (8.6 ppm) of the octahedrally coordinated aluminum similar magnesium. When LDH4 was calcined at 560$^{\circ}C$ for 3 hours in air, its layered structure was destroyed giving a mixed metal oxide. However it readily became rehydrated in aqueous chromate solution to its original structure.

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