Comparative Study of Conversion of Coral with Ammonium Dihydrogen Phosphate and Orthophosphoric Acid to Produce Calcium Phosphates

Rabea-Naemi Rosa Cegla (1) , Innocent Jacob Macha (1, 2) , Besim Ben-Nissan (1) , David Grossin (3) , Greg Heness (1) , Ren-Jei Chung (4)

1 UTS - University of Technology Sydney
2 Hochschule Koblenz
3 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
4 National Taipei University of Technology

Biogenic materials like corals, which are readily available, could be used to produce bioceramic materials and address significant advantages due to their unique structures and chemical compositions that contain Mg and Sr. Many conversion processes has been in the past proposed. In this work, a comparison study between the conversion of coral with orthophosphoric acid and ammonium dihydrogen phosphate was conducted. The resultant structures and compositions were studied using XRD, ICP-MS, SEM and FTIR. The results show that with phosphoric acid the coral was converted into mainly monetite (92%). The ammonium dihydrogen phosphate converted approximately 76% of the coral to hydroxyapatite through solid state reactions. The two routes proved to be effective in producing bioceramic materials from corals under moderate conditions of temperature with a basic condition favouring the yield of hydroxyapatite.

Mots clés: Hydroxyapatite; Monetite; Whitlockite; Coral; Orthophosphoric acid; Ammonium dihydrogen phosphate

Domaines: Matériaux; Chimie inorganique

Rabea-Naemi Rosa Cegla, Innocent Jacob Macha, Besim Ben-Nissan, David Grossin, Greg Heness, et al.. Comparative Study of Conversion of Coral with Ammonium Dihydrogen Phosphate and Orthophosphoric Acid to Produce Calcium Phosphates. Journal of The Australian Ceramic Society, 2014, 50 (2), pp.154-161. ⟨hal-02885805⟩