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The synthesis and spectroscopic characterisation of hydrotalcite formed from aluminate solutions

Palmer, Sara J., Frost, Ray L., & Grand, Laure-Marie (2011) The synthesis and spectroscopic characterisation of hydrotalcite formed from aluminate solutions. Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy, 79(1), pp. 156-160.

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Abstract

Raman spectroscopy has been used to characterise nine hydrotalcites prepared from aluminate and magnesium solutions (magnesium chloride and seawater). The aluminate hydrotalcites are proposed to have the following formula Mg6Al2(OH)16(CO32-).xH2O, Mg6Al2(OH)16(CO32-,SO42-).xH2O, and Mg6Al2(OH)16(SO42-).xH2O. The synthesis of these hydrotalcites using seawater results in the intercalation of sulfate anions into the hydrotalcite interlayer. The spectra have been used to assess the molecular assembly of the cations and anions in the hydrotalcite structures. The spectra have been conveniently subdivided into spectral features based upon the carbonate anion, the hydroxyl units and water units. This investigation has shown the ideal conditions to form hydrotalcite from aluminate solutions is at pH 14 using magnesium chloride. Changes in synthesis conditions resulted in the formation of impurity products aragonite, thenardite, and gypsum.

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3 citations in Web of Science®

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ID Code: 41331
Item Type: Journal Article
Keywords: hydrotalcite, aluminate, Bayer liquor, spectroscopy
DOI: 10.1016/j.saa.2011.02.028
ISSN: 1386-1425
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Divisions: Past > Schools > Chemistry
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2011 Elsevier B.V. All rights reserved.
Deposited On: 19 Apr 2011 10:35
Last Modified: 09 May 2014 20:43

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