Aziz, Muhammad Irfan Lazuardi (2021) Sintesis Nanomaterial Hidroksiapatit Menggunakan Prekursor Asam Sitrat dengan Metode Solvotermal. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Metode solvotermal digunakan untuk mensintesis Hidroksiapatit (HAp) dengan CaCO3 dan Na2HPO4 serta C6H8O7 sebagai prekursor untuk mengetahui pengaruh pH dan konsentrasi asam sitrat terhadap pertumbuhan HAp. Sintesis dilakukan dalam satu tahap pada pH yang bervariasi (4, 6, 8, dan 10) dan molaritas asam sitrat (1,00; 0,20; 0,10; 0,07 M) pada suhu 180℃ selama 24 jam dalam kondisi solvotermal. Pada pH 4, mineral dalam larutan mudah larut, sehingga kemungkinan menurunkan rasio mol Ca/P sepanjang reaksi dan menghasilkan senyawa monetite (DCPA). Pada pH 6, HAp mulai terbentuk kemungkinan karena peningkatan saturasi pada larutan dan mineral cenderung mengendap. Namun pada pH 6 juga terbentuk fasa oktakalsium fosfat (OCP) karena kemungkinan adanya dominasi ion H3O+ pada kondisi asam sehingga mempengaruhi jalur reaksi. Pada pH lebih besar dari 8, HAp sudah terbentuk satu fasa. Pada skala mikro, konsentrasi asam sitrat mempengaruhi pembentukan serta morfologi HAp karena fungsi ion sitrat sebagai agen pengkelat dari ion Ca+ dapat memperbesar kemungkinan reaksi berjalan sesuai dengan stoikiometri. Namun semakin tinggi konsentrasi ion sitrat dalam larutan maka semakin lambat laju agregasi partikel yang menyebabkan disegregasi dan dapat mempengaruhi ukuran dan bentuk partikel. HA-08-10 menunjukan kondisi optimum dengan kristalinitas tertinggi (84,25%) dan ukuran kristal sebesar 28.22 nm.
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The solvothermal was used to synthesis hydroxyapatite (HAp) using CaCO3, Na2HPO4 and C6H8O7 as precursors. The aim was to study the parameters that influence the development of HAp and the effect of citric acid on HAp growth. The synthesis was carried out in one-step at varied pH (4, 6, 8, and 10) and varied molarities of citric acid (1,00; 0,20; 0,10; 0,07 M) at 180℃ for 24 hours under solvothermal condition. At a pH of 4, the minerals in the solution dissolved easily and thus could disrupt the Ca/P mole ratio throughout the reaction and produce monetite (DCPA) compounds. HAp began to form at pH 6 likely due to an increase in saturation in the solution and minerals precipitated. However, there was a different phase at pH 6 where an octacalcium phosphate (OCP) phase formed likely because of the dominance of H3O+ ions in an acidic environment which might impact the reaction pathway. HAp was produced in a single phase at a pH greater than 8. The citrate ions, as the chelating agent of Ca+ ions, could improve the chance of the reaction occurring according to stoichiometry, which might impact the development and shape of HAp at the micro-scale. However, as the concentration of citrate ions in the solution rises, particle aggregation slows, causing segregation and affecting the particle size and shape. HA-08-10 was found to be the optimum condition with the highest crystallinity (84.25%) and crystal size of 28.22 nm.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Asam Sitrat, Hidroksiapatit, Metode Solvothermal, Sintesis satu tahap, Citric Acid, Hydroxyapatite, One-step synthesis, Solvothermal Methods. |
| Subjects: | Q Science > QD Chemistry > QD547 Flocculation, precipitation, adsorption, etc. Q Science > QD Chemistry > QD905.2 Crystals. |
| Divisions: | Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis |
| Depositing User: | Muhammad Irfan Lazuardi Aziz |
| Date Deposited: | 09 Feb 2022 06:54 |
| Last Modified: | 03 Sep 2024 06:47 |
| URI: | http://repository.its.ac.id/id/eprint/93230 |
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