Thermal decomposition of hydronium jarosite (H3O)Fe3 (SO4)2 (OH)6

Frost, Ray L., Wills, Rachael-Anne, Kloprogge, J. Theo, & Martens, Wayde N. (2006) Thermal decomposition of hydronium jarosite (H3O)Fe3 (SO4)2 (OH)6. Journal of thermal Analysis and Calorimetry, 83(1), pp. 213-218.

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Abstract

Thermogravimetry combined with mass spectrometry has been used to study the thermal decomposition of a synthetic hydronium jarosite. Five mass loss steps are observed at 262 294, 385, 557 and 619 degrees Celsius. The mass loss step at 557 degrees Celsius is sharp and marks a sharp loss of sulphate as SO3 from the hydronium jarosite. Mass spectrometry through evolved gases confirms the first three mass loss steps to dehydroxylation, the fourth to a mass loss of the hydrated proton and a sulphate and the final step to the loss of the remaining sulphate. Changes in the molecular structure of the hydronium jarosite were followed by infrared emission spectroscopy. This technique allows the infrared spectrum at the elevated temperatures to be obtained. Infrared emission spectroscopy confirms the dehydroxylation has taken place by 400 degrees Celsius and the sulphate loss by 650 degrees Celsius. Jarosites are a group of minerals formed in evaporite deposits and form a component of the efflorescence. The minerals can function as cation and heavy metal collectors. Hydronium jarosite has the potential to act as a cation collector by the replacement of the proton with a heavy metal cation.

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ID Code: 3718
Item Type: Journal Article
Refereed: Yes
Additional Information: This manuscript is one of a series of papers on the characterisation of jarosites including their thermal stability. Interest in such minerals stems from the possibility of their existence on Mars. such minerals are only formed from solutions.
Keywords: jarosite, hydronium jarosite, dehydration, dehydroxylation, infrared emission spectroscopy, high, resolution thermogravimetric analysis
DOI: 10.1007/s10973-005-6908-0
ISSN: 1572-8943
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2006 Springer
Copyright Statement: The original publication is available at SpringerLink
http://www.springerlink.com
Deposited On: 21 Mar 2006 00:00
Last Modified: 29 Feb 2012 13:15

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