Mid-infrared and near infrared spectroscopic study of selected magnesium carbonate minerals containing ferric iron - implications for the geosequestration of greenhouse gases
Frost, Ray L., Reddy, B. Jagannadha, Bahfenne, Silmarilly, & Graham, Jessica E. (2009) Mid-infrared and near infrared spectroscopic study of selected magnesium carbonate minerals containing ferric iron - implications for the geosequestration of greenhouse gases. Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy, 72(3), pp. 597-604.
The proposal to remove greenhouse gases by pumping CO2 several kilometres below the ground implies that many carbonate containing minerals will be formed. Among these minerals brugnatellite and coalingite are probable. Two ferric ion bearing minerals brugnatellite and coalingite with a hydrotalcite -like structure have been characterised by a combination of infrared and near-infrared spectroscopy. The infrared spectra of the OH stretching region are characterised by OH and water stretching vibrations. Both the first and second fundamental overtones of these bands are observed in the NIR spectra in the 7030 to 7235 cm-1 and 10490 to 10570 cm-1. Intense (CO3)2- symmetric and antisymmetric stretching vibrations support the concept that the carbonate ion is distorted. The position of the water bending vibration indicates the water is strongly hydrogen bonded in the mineral structure. Split NIR bands at around 8675 and 11100 cm-1 indicates that some replacement of magnesium ions by ferrous ions in the mineral structure has occurred. Near-infrared spectroscopy is ideal for the assessment of the formation of carbonate minerals.
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|Item Type:||Journal Article|
|Keywords:||Sequestration of greenhouse gases; Magnesium Carbonate; (CO3)2- ; Brugnatellite; Coalingite; NIR spectroscopy; Fe for Mg substitution; OH-overtones|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
Past > Schools > School of Physical & Chemical Sciences
|Copyright Owner:||Copyright 2009 Elsevier|
|Copyright Statement:||Reproduced in accordance with the copyright policy of the publisher|
|Deposited On:||09 Feb 2009 13:49|
|Last Modified:||01 Mar 2012 00:07|
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