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Thermo-Raman spectroscopy of synthetic Nesquehonite – implication for the geosequestration of greenhouse gases

Frost, Ray L., Hales, Matthew C., & Martens, Wayde N. (2008) Thermo-Raman spectroscopy of synthetic Nesquehonite – implication for the geosequestration of greenhouse gases. Journal of Raman Spectroscopy, 39(9), pp. 1141-1149.

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Abstract

Pure nesquehonite (MgCO3.3H2O)/Mg(HCO3)(OH).2H2O was synthesised and characterised by a combination of thermo-Raman spectroscopy and thermogravimetry with evolved gas analysis. Thermo-Raman spectroscopy shows an intense band at 1098 cm-1 which shifts to 1105 cm-1 at 450 degrees Celsius, assigned to the ν1 CO32- symmetric stretching mode. Two bands at 1419 and 1509 cm-1 assigned to the ν3 antisymmetric stretching mode shift to 1434 and 1504 cm-1 at 175 degrees Celsius. Two new peaks at 1385 and 1405 cm-1 observed at temperatures higher than 175 degrees Celsius are assigned to the antisymmetric stretching modes of the (HCO3)- units. Throughout all the ThermoRaman spectra a band at 3550 cm-1 attributed to the stretching vibration of OH units. Raman bands at 3124, 3295, and 3423 are assigned to water stretching vibrations. The intensity of these bands is lost by 175 degrees Celsius. The Raman spectra were in harmony with the thermal analysis data. This research has defined the thermal stability of one of the hydrous carbonates namely nesquehonite. ThermoRaman spectroscopy enables the thermal stability of the mineral nesquehonite to be defined and further the changes in the formula of nesquehonite with temperature change can be defined. Indeed Raman spectroscopy enables the formula of nesquehonite to be better defined as Mg(OH)(HCO3).2H2O.

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204 since deposited on 28 Aug 2008
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ID Code: 14552
Item Type: Journal Article
Keywords: Nesquehonite, Hydromagnesite, Thermogravimetric analysis, Hot, stage Raman Spectroscopy
DOI: 10.1002/jrs.1950
ISSN: 0377-0486
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Colloid and Surface Chemistry (030603)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > School of Physical & Chemical Sciences
Copyright Owner: Copyright 2008 John Wiley & Sons
Copyright Statement: The definitive version is available on publication at www3.interscience.wiley.com
Deposited On: 28 Aug 2008
Last Modified: 29 Feb 2012 23:46

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