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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 33, Number 6
BKCSDE 33(6)
June 20, 2012 

 
Title
Layered Metal Hydroxides Containing Calcium and Their Structural Analysis
Author
Tae-Hyun Kim, Il Heo, Seung-Min Paek, Chung-Berm Park, Ae-Jin Choi, Sung-Han Lee, Jin-Ho Choy*, Jae-Min Oh*
Keywords
Layered metal hydroxide, Hydrocalumite, Rietvled refinement, X-ray diffraction, X-ray absorption spectroscopy
Abstract
Layered metal hydroxides (LMHs) containing calcium were synthesized by coprecipitation in solution having two different trivalent metal ions, iron and aluminum. Two mixed metal solutions (Ca2+/Al3+ and Ca2+/Fe3+ = 2/1) were added to sodium hydroxide solution and the final pH was adjusted to ~11.5 and ~13 for CaAl-and CaFe-LMHs. Powder X-ray diffraction (XRD) for the two LMH samples showed well developed (00l) diffractions indicating 2-dimensional crystal structure of the synthesized LMHs. Rietveld refinement of the Xray diffraction pattern, the local structure analysis through X-ray absorption spectroscopy, and thermal analysis also confirmed that the synthesized precipitates show typical structure of LMHs. The chemical formulae, Ca2.04Al1(OH)6(NO3)·5.25H2O and Ca2.01Fe1(OH)6(NO3)·4.75H2O were determined by inductively coupled plasma-atomic emission spectroscopy (ICP-AES). Particle morphology and thermal behavior for the synthesized LMHs were examined by field emission scanning electron microscopy and thermogravimetricdifferential scanning calorimetry.
Page
1845 - 1850
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