Kinetika reaksi padat-padat pembentukan Hydroxyapatite dari kalsium karbonat dan dikalsium fosfat dihidrat

ATHO'ILLAH, Ibnu, Ir. Hary Sulistyo, SU.,PhD

2002 | Tesis | S2 Teknik Kimia

Biokeramik (hydroxyuputrte) digunakan sebagai material implantasi menggantikan material polimer atau logam, karena biokeramik lebih stabil di dalam tubuh dibandingkan dengan resin sintetik atau logam, tidak beracun dan tidak terjadi iritasi. Penelitian ini bertujuan untuk mempelajari kinetika reaksi padat-padat pembentukan hydroxyupcrf lie. Pembuatan lzydroxyupalife dilakukan dengan inencampur secara hoinogen padatan kalsium karbonat dan dikalsium fosfat dihidrat dengan perbandingan stokiometris. Campuran ditekan dan dicetak berbentuk cakram, kemudian dibakar pada suhu 1100 sampai 1300 "C dengan kecepatan pembakaran 5°C / menit. Produk yang didapat dianalisa dengan hficrred Spectrophotometer, X-Ray Dfliuction dan Atomic Absorption Spectophotometer untuk mengetahui jenis produk yang terbentuk selama reaksi dan mencari konversi. Hasil percobaan menunjukkan bahwa Model I11 memberikan ralat rerata terkecil yaitu 8,17 %. Hal ini menunjukkan bahwa mekanisine reaksi dikontrol oleh transfer massa dan reaksi kimia secara simultan. Pengaruh suhu dinyatakan dengan teori ukirved complex atau frunsifionul stufe dalatn bentuk persatnaan : formula dengan K1 dan K2 adalah konstanta kecepatan transfer massa dan reaksi Kimia

In recent years, bioceramic materials (hydroxyapatite) have been supersending polymeric or metallic materials for use as medical implant materials, because bioceramics are more stable in the living body then synthetic resins and metals, and are non-toxic and non-irritating. The aim of this research was to study kinetics of solid state reactions to form hydroxyapatite. The process for producing Hydroxyapatite powder by mixed calcium carbonate powder and dicalcium phosphate dihydrate powder with stoichiometric ratio. The mixed powder thus obtained was compressed using isostatic press in disk form, firing at 1100 until 1300 "C with heating rate 5 "C/minutes. The product thus obtained analyzed with Infrared Spectrophotometer, X-Ray Diffraction and Atomic Absorption Spectophotometer. This analysis showed the kind of product that formed since reactions and obtained conversion that formed. Experimental results agree with Model TI1 and relative mean error correction were 8.17 %. It was mean that reaction mechanism were controlled by mass transfer and chemical reaction simultaneously . The effect of temperature reaction was expressed by actived complex or transition state theory, gives : formula where K1 and K1 were mass transfer coefficient and chemical reaction coefficient.

Kata Kunci : hydroxyapatite, kinetika, reaksi padat-padat, hyroxyapatite, kinetics, solid state reactions