Synthesis of hydroxyapatite by using calcium carbonate and phosphoric acid in various water-ethanol solvent systems

• Authors: Arzu Engin , İsmail Girgin
• Languages of publication: EN

Abstracts

EN

The purpose of the present study is to synthesize hydroxyapatite by using CaCO3 and H3PO4 in various water-ethanol solvent systems. It was observed from experiments that formation of ammonium phosphate compounds hindered the formation of calcium phosphates in ethanol medium. Although the reactivity was better in aqueous medium, the carbonate contents of the products obtained were above 8.5%. Best results with a carbonate content as low as 3.82% was obtained in 50% ethanol containing mixed-aqueous medium at 80°C and the FTIR analysis showed that the product was a carbonated apatite with a calculated composition of 14CaO·4.2P2O5·CO3·7.2H2O. The amorphous and porous phosphate compound obtained with a BET surface area of 106.6 m2 g−1 seems to be useful as adsorbent in wastewater treatment. Upon sintering of the amorphous product at 750°C, crystalline hydroxyapatite with a BET surface area of 25.9 m2 g−1 is obtained that may be used in biomedical applications. [...]

Keywords

EN

Synthesis; Hydroxyapatite; XRD; FTIR

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2009
• Volume: 7
• Issue: 4
• Pages: 745-751

Dates

published

1 - 12 - 2009

online

6 - 10 - 2009

Contributors

author

Arzu Engin

• Faculty of Engineering, Chemical Engineering Department, Afyon Kocatepe University, 03200, Afyonkarahisar, Turkey

author

İsmail Girgin

• Faculty of Engineering, Mining Engineering Department, Hacettepe University, 06800, Beytepe, Ankara, Turkey

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Identifiers

DOI

10.2478/s11532-009-0063-6