Synthesis and FTIR Characterization of Mg-Hydroxylapatite Derived from Dolostone with High Dolomite Mineral Content
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Date
2020-08-24
Journal Title
Journal ISSN
Volume Title
Publisher
University of Dar es Salaam
Abstract
We present the synthesis of magnesium-substituted hydroxylapatite starting from locally available
dolostone. The apatite was prepared by a reaction between heat pre-treated dolostone powder with
phosphoric acid, maintained at the pH of 12.5 using sodium hydroxide. The resultant material was
then calcined at 500 °C, 600 °C, 700 °C, 800 °C and 900 °C. The precursor dolostone was
characterized by organic elemental analyser (CHNS-O analyser), X-ray fluorescence (XRF) and
Fourier transform infrared spectroscopy (FTIR), while the synthesized material was characterized
by using FTIR. Results indicated that the dominant mineral in the carbonate rock materials was
near-stoichiometric dolomite, while the synthesized material was found to be (carbonate,
magnesium)-substituted hydroxylapatite. The synthesized material did not exhibit hydroxylapatite
diagnostic peaks until after being calcined at 600 °C. The peaks became more distinct with
increase in calcination temperature. The prepared material exhibited a low degree of crystallinity
and low conversion temperature to beta-tricalcium phosphate, 700–800 °C. These characteristics
are typical of a magnesium-substituted hydroxylapatite (Mg-substituted β-tricalcium phosphate).
This work has demonstrated the feasibility of synthesizing magnesium-substituted hydroxylapatite
(Mg-HA), with potential applications in water purification, using dolostone as a
calcium/magnesium source
Sustainable Development Goals
SDG 6: Clean Water and Sanitation, SDG 9: Industry, Innovation, and Infrastructure, SDG 12: Responsible Consumption and Production.
Keywords
Dolostone, crystallinity, magnesium-substituted hydroxylapatite, agnesium- substituted beta-tricalcium phosphate