Abstract
The hydrotalcite based upon manganese known as charmarite Mn4Al2(OH)12CO3·3H2O has been synthesised with different Mn/Al ratios from 4:1 to 2:1. Impurities of manganese oxide, rhodochrosite and bayerite at low concentrations were also produced during the synthesis. The thermal stability of charmarite was investigated using thermogravimetry. The manganese hydrotalcite decomposed in stages with mass loss steps at 211, 305 and 793 °C. The product of the thermal decomposition was amorphous material mixed with manganese oxide. A comparison is made with the thermal decomposition of the Mg/Al hydrotalcite. It is concluded that the synthetic charmarite is slightly less stable than hydrotalcite.
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Acknowledgements
The financial and infra-structure support of the Queensland Research and Development Centre (QRDC-RioTintoAlcan) and the Queensland University of Technology Inorganic Materials Research Program of the School of Physical and Chemical Sciences are gratefully acknowledged. One of the authors (LMG) thanks the Queensland University of Technology for a visiting student fellowship.
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Appendix
Appendix
Calculation of water content for Mn2+/Al3+ hydrotalcite
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Proposed composition Mn6Al2(OH)16CO3·xH2O
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Total mass of hydrotalcite analysed: 26.852 mg
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% mass loss of water up to 264 °C: 9.67%
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Mass of water removed up to 264 °C: 2.5966 mg
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Molar mass of water: 18.02 g mol−1
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Moles of water removed: 0.144095 mmol
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Mass of dehydrated mineral: 26.852 – 2.5966 = 24.2554 mg
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Molar mass of dehydrated mineral: 715.738 g mol−1
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Moles of dehydrated mineral: 0.033888 mmol
Calculation of x:
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1 mol dehydrated mineral: x mol H2O
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0.033888 mmol dehydrated mineral: 0.144095 mmol H2O
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x = 4.2521 − 4 mol
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Formula: Mn6Al2(OH)16CO3·4H2O
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Grand, LM., Palmer, S.J. & Frost, R.L. Synthesis and thermal stability of hydrotalcites containing manganese. J Therm Anal Calorim 100, 981–985 (2010). https://doi.org/10.1007/s10973-009-0402-z
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DOI: https://doi.org/10.1007/s10973-009-0402-z