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Synthesis of Hydroxyapatite via Sol-Gel Dip-Coating Method on Ceramic Support

Hydroxyapatite (HA) has been used extensively in application of biomedical either in the form of porous ceramics, dense ceramics, powders or granules for gap filling or coatings for implants. Synthetic HA also has an excellent ion exchange properties that used as a filling material for chromatography columns. Furthermore, many researchers have reported that high removal efficiency of the heavy metals can be achieved by using synthetic HA. In this study, HA was synthesized via sol-gel method by using calcium nitrate tetrahydrate and triethyl phosphate as the precursors and 2-metoxiethanol ether as an organic solvent. Then, HA sol was deposited on silica-alumina based ceramics whose made by recycled sanitary ware waste by dip-coating method. The obtained coated substrates were then dried at 150°C and subsequently subjected to calcination up to 1000°C. Fourier Transform Infrared (FTIR) characterization for the HA powders dried at 150°C and calcined at 600°C, 800°C and 1000°C were carried out to come out with the spectral characteristic indicative of chemical bonding. High Purity of the obtained hydroxyapatite was confirmed by XRD analysis. The SEM micrographs displayed the microstructure of the HA coatings.