Jasmine, Audya Wynona Rayhannah and Yuniarti, Vera (2026) Pengaruh Kecepatan Putar dan Konsentrasi Ca(OH)₂ dari Cangkang Keong Sawah (Pila Ampullacea) Terhadap Homogenitas Hidroksiapatit pada Reaktor Berpengaduk. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Hidroksiapatit (HAp) merupakan material biomaterial yang banyak diaplikasikan di bidang medis dan lingkungan, sehingga diperlukan produk dengan tingkat homogenitas yang baik. Proyek akhir ini bertujuan untuk menganalisis pengaruh kecepatan putar dan konsentrasi Ca(OH)₂ terhadap homogenitas hidroksiapatit yang disintesis dalam reaktor berpengaduk. Proses sintesis dilakukan menggunakan metode presipitasi basah dengan variasi kecepatan putar dan konsentrasi Ca(OH)₂ sebagai parameter utama yang kemudian dibandingkan dengan metode CFD. Homogenitas hidroksiapatit dianalisis melalui karakterisasi fasa, ukuran partikel, dan distribusi unsur. Hasil eksperimen dan simulasi CFD menunjukkan bahwa pola aliran yang terbentuk berupa single loop circulation. Kecepatan putar 350 rpm menghasilkan pola aliran terbaik dengan waktu homogenitas tercepat, yaitu 18 menit (0,5 M), 15 menit (0,8 M), dan 13 menit (1 M), karena energi pengadukan yang lebih besar mampu meningkatkan pemerataan suspensi Ca(OH)₂. Pada kondisi 0,5 M dan 350 rpm, nilai %Δρ mencapai 0,03% serta rasio Ca/P hasil EDX sebesar 1,64 yang mendekati rasio stoikiometri hidroksiapatit 1,67. Analisis koefisien perpindahan massa dan korelasi bilangan tak berdimensi juga menunjukkan bahwa peningkatan kecepatan putar memperkuat perpindahan massa dalam reaktor CSTR, sehingga peningkatan bilangan Reynolds terbukti meningkatkan efektivitas proses homogenisasi.
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ds, requiring products with a high level of homogeneity. This study aims to analyze the effect of stirring speed and Ca(OH)₂ concentration on the homogeneity of hydroxyapatite synthesized in a stirred reactor. The synthesis process was carried out using the wet precipitation method with variations in stirring speed and Ca(OH)₂ concentration as the main parameters, which were then compared with Computational Fluid Dynamics (CFD) simulations. The homogeneity of hydroxyapatite was analyzed through phase characterization, particle size, and elemental distribution. Experimental and CFD simulation results showed that the flow pattern formed was a single loop circulation. A stirring speed of 350 rpm produced the best flow pattern with the shortest homogeneity time, namely 18 minutes (0.5 M), 15 minutes (0.8 M), and 13 minutes (1 M), due to higher mixing energy that enhanced the uniform distribution of Ca(OH)₂ suspension. Under the condition of 0.5 M and 350 rpm, the %Δρ value reached 0.03%, while the EDX Ca/P ratio was 1.64, approaching the stoichiometric ratio of hydroxyapatite (1.67). The analysis of mass transfer coefficients and dimensionless Number correlations also indicated that increasing the stirring speed enhanced mass transfer in the CSTR reactor, proving that higher Reynolds Numbers improve the effectiveness of the homogenization process.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Ca(OH)₂, Homogenitas, Kecepatan Putar, Konsentrasi Prekursor, Ca(OH)₂, Hydroxyapatite, Precursor Concentration, Stirring Speed |
| Subjects: | T Technology > TP Chemical technology T Technology > TP Chemical technology > TP155.7 Chemical processes. T Technology > TP Chemical technology > TP248.3 Biochemical engineering. Bioprocess engineering |
| Divisions: | Faculty of Vocational > 24305-Industrial Chemical Engineering |
| Depositing User: | Audya Wynona Rayhannah Jasmine |
| Date Deposited: | 30 Jul 2026 01:22 |
| Last Modified: | 30 Jul 2026 01:22 |
| URI: | http://repository.its.ac.id/id/eprint/140049 |
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