The effects of synthesis pH and hydrothermal treatment on the formation of zinc aluminum hydrotalcites
Kloprogge, J. Theo, Hickey, Leisel, & Frost, Ray L. (2004) The effects of synthesis pH and hydrothermal treatment on the formation of zinc aluminum hydrotalcites. Journal of Solid State Chemistry, 177(11), pp. 4047-4057.
Zn/Al hydrotalcites were synthesised by coprecipitation at increasing pH from 6.0 – 14.0, followed by hydrothermal treatment at 150 oC for 7 days. The materials were characterised by XRD, STEM, ICP-AES, thermal analysis, infrared spectroscopy and Raman spectroscopy. The XRD analysis for the samples prepared between pH 9.0 – 12.0 showed a pattern typical of hydrotalcite, with a c-axis distance of ~22.6 Å. STEM showed that the pH of preparation affected the stability of the hydrotalcite and that instability, observed at pH 9.0, favoured the formation of mixed phases when treated hydrothermally. It was also shown that treatment of a stable starting material increased the crystallinity and resulted in the formation of hexagonal plate shaped particles. ICP-AES and thermal analysis showed that the Zn/Al ratio and thermal stability increased with pH. Thermal analysis showed three major weight losses corresponding to the loss of interparticle water, interlayer water and dehydroxylation of the hydroxide layers and decarbonisation of the interlayer region.
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|Item Type:||Journal Article|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2004 Elsevier|
|Copyright Statement:||Reproduced in accordance with the copyright policy of the publisher: This journal is available online.|
|Deposited On:||14 Mar 2005|
|Last Modified:||09 Jun 2010 12:23|
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