The thermal decomposition of hydronium jarosite and ammoniojarosite

Simple item page
dc.contributor.authorSpratt, HJen_AU
dc.contributor.authorRintoul, Len_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorMartens, WNen_AU
dc.date.accessioned2016-10-30T22:53:12Zen_AU
dc.date.available2016-10-30T22:53:12Zen_AU
dc.date.issued2013-05-16en_AU
dc.date.statistics2016-10-31en_AU
dc.description.abstractThe thermal decomposition of hydronium jarosite and ammoniojarosite was studied using thermogravimetric analysis and mass spectrometry, in situ synchrotron X-ray diffraction and infrared emission spectroscopy. There was no evidence for the simultaneous loss of water and sulfur dioxide during the desulfonation stage as has previously been reported for hydronium jarosite. Conversely, all hydrogen atoms are lost during the dehydration and dehydroxylation stage from 270 to 400 °C and no water, hydroxyl groups or hydronium ions persist after 400 °C. The same can be said for ammoniojarosite. The first mass loss step during the decomposition of hydronium jarosite has been assigned to the loss of the hydronium ion via protonation of the surrounding hydroxyl groups to evolve two water molecules. For ammoniojarosite, this step corresponds to the protonation of a hydroxyl group by ammonium, so that ammonia and water are liberated simultaneously. Iron(II) sulfate was identified as a possible intermediate during the decomposition of ammoniojarosite (421–521 °C) due to a redox reaction between iron(III) and the liberated ammonia during decomposition. Iron(II) ions were also confirmed with the 1,10-phenanthroline test. Iron(III) sulfate and other commonly suggested intermediates for hydronium and ammoniojarosite decomposition are not major crystalline phases; if they are formed, then they most likely exist as an amorphous phase or a different low temperature phases than usual. © 2013, Akadémiai Kiadó, Budapest, Hungary.en_AU
dc.identifier.citationSpratt, H., Rintoul, L., Avdeev, M., & Martens, W. (2014). The thermal decomposition of hydronium jarosite and ammoniojarosite. Journal of Thermal Analysis and Calorimetry, 115(1), 101-109. doi:10.1007/s10973-013-3213-1en_AU
dc.identifier.govdoc7539en_AU
dc.identifier.issn1588-2926en_AU
dc.identifier.issue1en_AU
dc.identifier.journaltitleJournal of Thermal Analysis and Calorimetryen_AU
dc.identifier.pagination101-109en_AU
dc.identifier.urihttp://dx.doi.org/10.1007/s10973-013-3213-1en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/7977en_AU
dc.identifier.volume115en_AU
dc.language.isoenen_AU
dc.publisherSpringer Linken_AU
dc.subjectPyrolysisen_AU
dc.subjectIronen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectEmission spectroscopyen_AU
dc.subjectOxonium ionsen_AU
dc.subjectRedox reactionsen_AU
dc.titleThe thermal decomposition of hydronium jarosite and ammoniojarositeen_AU
dc.typeJournal Articleen_AU
Files
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Journal Articles