Influence of the Phosphate Salts Nature on the Synthesis of Apatite in a Wet Atmosphere
Volume 3, Issue 1, February 2015, Pages: 1-6
Received: Nov. 28, 2014;
Accepted: Dec. 17, 2014;
Published: Jan. 26, 2015
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Rachida Elosrouti, Laboratory of Agricultural Resources and Process Engineering, Faculty of Sciences Kenitra, Kenitra, Morocco
Brahim Sallek, Laboratory of Agricultural Resources and Process Engineering, Faculty of Sciences Kenitra, Kenitra, Morocco
Hassan Chaair, Laboratory of processes Engineering, Faculty of Science and Techniques Mohammedia, Mohammedia, Morocco
Khalid Digua, Laboratory of processes Engineering, Faculty of Science and Techniques Mohammedia, Mohammedia, Morocco
Hassan Oudadesse, Laboratory of Materials Science, Faculty of Rennes, Rennes, France
Hydroxyapatite (Ca10 (PO4)6 (OH)2, HAP) is widely used as a bone graft substitute, potential carriers of drugs and in the purification of proteins, et could be synthesized artificially by various methods but the hydrothermal method at low temperature, which gives a good crystallinity, is often used. Moreover, several studies have shown that, in the synthesis of calcium phosphate, the nature of the final product may differ depending on the experimental conditions including the value of the initial Ca / P ratio, the nature of the calcium salts used and influence of the residence time of the initial products used in experimental conditions. Thus, in this work, while maintaining the initial Ca / P ratio to a fixed value (1,00 ± 0,01), we followed the behavior of two initial mixtures of a calcium salt and one of two other phosphate salts (di-ammonium hydrogen phosphate and di-ammonium hydrogen phosphate) as a function of residence time in an autoclave at a temperature of 80 °C in a saturated water vapor environment. The characteristics of the final product were carried out by four methods: X-ray diffraction, infrared absorption spectroscopy in the range 400 cm-1 _ 4000 cm-1, chemical analysis, and scanning electron microscopy. The XRD analysis has shown that the products obtained have all an apatite structure. They show the presence, alongside that of apatite, the identifiable stripes of the calcite for the residence times in the experience that are less than 48 hours. Similarly, the infrared absorption spectroscopy for short residence times ranging from 2 hours to 8 am always have shown the presence of the bands specific to the CO32- ions which are fit for calcite and which decrease by increasing the residence time. Beyond this time, in the two experimental conditions, we note the total disappearance of these bands after 48 hours. Beyond 48 hours, by chemical analysis the atomic ratio Ca / P remains practically constant and equal to 1.60 ± 0.01 for salts (NH4) H2PO4 and 1.58 ± 0.01 synthesized from the salts (NH4) H2PO4 within experimental error. Also, the SEM photographs have shown the presence of a phase formed of a needle agglomerate.
Influence of the Phosphate Salts Nature on the Synthesis of Apatite in a Wet Atmosphere, Science Research.
Vol. 3, No. 1,
2015, pp. 1-6.
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