One-Step Synthesis of Calcium Hydroxyapatite from Calcium Carbonate and Orthophosphoric Acid under Moderate Conditions
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- 作者：Doan Pham Minh ; Ngoc Dung Tran ; Ange Nzihou ; Patrick Sharrock
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2013
- 出版时间：January 30, 2013
- 年：2013
- 卷：52
- 期：4
- 页码：1439-1447
- 全文大小：571K
- 年卷期：v.52,no.4(January 30, 2013)
- ISSN：1520-5045
文摘
Calcium hydroxyapatite (Ca鈥揌A) is a versatile material which can be used in several applications. This study aimed to investigate the one-step synthesis of Ca鈥揌A using solely calcium carbonate as-is and orthophosphoric acid as widely available and low cost initial reactants. The stirring rate and quantity of water had only some slight effects on the reaction rate. On the other hand, the reaction temperature influenced strongly the decomposition of the initial calcium carbonate particles and therefore the composition of the solids obtained. At 25鈥?0 掳C, high contents of calcium carbonate remained in the solid products even after a long reaction time of 168 h. At 80 掳C, the decomposition of calcium carbonate was nearly complete after 24 h of reaction. Brushite (CaHPO4路2H2O) and octacalcium phosphate (OCP, Ca8(HPO4)2(PO4)4路5H2O) were the main intermediates of the reaction. When the decomposition of calcium carbonate was complete (80 掳C, 24 h), stoichiometric Ca鈥揌A was obtained, with some little amounts of carbonate-containing apatites of both A-type and B-type. Carbon dioxide was the only by-product of the reaction, and no water rinsing was required for the purification of products.