Authors:
R Frost Queensland University of Technology Inorganic Materials Research Program, School of Physical and Chemical Sciences Brisbane Australia 2434 4001 Queensland Brisbane Australia 2434 4001 Queensland

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R Wills Queensland University of Technology Inorganic Materials Research Program, School of Physical and Chemical Sciences Brisbane Australia 2434 4001 Queensland Brisbane Australia 2434 4001 Queensland

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J Kloprogge Queensland University of Technology Inorganic Materials Research Program, School of Physical and Chemical Sciences Brisbane Australia 2434 4001 Queensland Brisbane Australia 2434 4001 Queensland

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W Martens Queensland University of Technology Inorganic Materials Research Program, School of Physical and Chemical Sciences Brisbane Australia 2434 4001 Queensland Brisbane Australia 2434 4001 Queensland

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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 619C. The mass loss step at 557C 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 and the sulphate loss by 650C. 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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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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