Electronic Theses and Dissertation

Telah dilakukan penelitian yang mengkaji sintesis hidroksiapatit dari serbuk cangkang tiram (crassostrea gigas) dengan metode presipitasi terhadap karakteristik hidroksiapatit (ukuran kristal). hidroksiapatit disintesis dari cangkang tiram yang dikalsinasi terlebih dahulu pada temperatur 1000ºc selama 5 jam untuk dimanfaatkan kandungan kalsium oksidanya (cao). kemudian, serbuk cao direaksikan dengan asam fosfat (h3po4) dan selanjutnya disintering pada temperatur 700, 800, dan 900ºc selama 2 jam. penentuan fasa cao dan hidroksiapatit dilakukan melalui pengujian xrd (x-ray diffraction). berdasarkan hasil pengujian xrd, fasa cao dan hidroksiapatit telah berhasil terbentuk. hasil karakterisasi diketahui bahwa temperatur sintering sangat berpengaruh terhadap ukuran kristal, ukuran kristal makin besar seiring dengan pertambahan temperatur sintering. ukuran kristal yang diperoleh dari intensitas terbesar adalah 13,721 nm pada suhu 700°c, 21,242 nm pada suhu 800°c, dan 29,868 nm pada suhu 900°c. morfologi permukaan sampel ditunjukkan oleh hasil uji sem dan didukung hasil edx. morfologi permukaan sampel menggunakan sem diketahui bahwa morfologi dari partikel hap hasil sintesis tidak dapat diamati dengan baik karena terjadinya aglomerasi dari partikel-partikel tersebut. kata kunci: cangkang tiram, cao, hidroksiapatit, ukuran kristal, morfologi permukaan.

The synthesis and characterization of hydroxyapatite (HAp) from oyster shell powder (Crassostrea gigas) using the precipitation method has been carried out. Hydroxyapatite is synthesized from oyster shells which are pre-calcined at a temperature of 1000ºC for 5 hours to utilize the calcium oxide (CaO) content. Then, the CaO powder was reacted with phosphoric acid (H3PO4) and then sintered at temperatures of 700, 800 and 900ºC for 2 hours. The determination of the CaO and hydroxyapatite phases was carried out through XRD (X-Ray Diffraction) testing. Based on the results of the XRD test, the CaO and hydroxyapatite phases have been successfully formed. The characterization results show that the sintering temperature greatly influences the crystal size, the larger the crystal size as the sintering temperature increases. The crystal sizes obtained from the highest intensities were 13.721 nm at 700°C, 21.242 nm at 800°C, and 29.868 nm at 900°C. The surface morphology of the samples was shown by the SEM test results and supported by the EDX results. It is known that the surface morphology of the samples using SEM showed that the morphology of the synthesized HAp particles could not be properly observed due to the agglomeration of these particles. Keywords: Oyster shell, CaO, Hydroxyapatite, Crystal size, Surface morphology.