Comparison of Air Contact And Distilled Water Distribution Method in The Conversion of Cao to Ca(OH)2 As A Precursor Hydroxyapatite Synthesis

Abstract

<p>Eggshells containing CaCO<sub>3</sub> have potential as bioceramics for several tissue engineering applications. The content of CaCO<sub>3</sub> converted into Ca(OH)<sub>2</sub> can be used as a precursor to implant material. The purpose of the study was to compare two methods of converting CaO into Ca(OH)<sub>2</sub> as the primary material for making hydroxyapatite. The method used is direct contact with air and dissolution with water. Hydroxyapatite synthesis using Ca(OH)<sub>2</sub> is calcined from CaCO<sub>3 </sub>with <em>a sintering</em> temperature of 900 °C. The result of calcination is in the form of CaO. The stages of obtaining Ca(OH)<sub>2</sub> by converting CaO using two methods, namely direct contact with air and dissolution with water. The XRD characterization results obtained that Ca(OH)<sub>2</sub> results from direct contact with air show the formation of phase (<em>portlandite</em>), which is characterized by its presence at the highest typical 2θ angles = 18.18°, 28.68°, 34.30°, 47.40°, 50.92°, 54.16°, and 62.62°. The XRD Ca(OH)<sub>2</sub> pattern with the distilled water distribution process shows the formation of a phase (<em>portlandite</em>) characterized by its presence at angles of 2θ = 18.18°, 28.68°, 34.30°, 47.40°, 50.92°, 54.16°, and 62.62 °. The results of FTIR Ca(OH)<sub>2</sub> characterization of air contact and water dissolution showed strong O-H functional groups at wave numbers 3643 cm<sup>-1</sup> and 3642 cm<sup>-1</sup>, C-O groups at 1487 cm<sup>-1</sup> and 1483 cm<sup>-1</sup>. This suggests that both methods can convert CaO to Ca(OH)<sub>2</sub>, which synthesizes hydroxyapatite. The hydroxyapatite characterization results obtained have met the standard.</p>