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KMID : 1059519950390070578
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Journal of the Korean Chemical Society
1995 Volume.39 No. 7 p.578 ~ p.584
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Studies on the Preparation of Aragonite (Ⅰ). Formation of Aragonite of Pillar Shape
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Park Seoung-Sik
Ha Ho
Lee Hee-Cheol
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Abstract
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An aqueous solution of Ca(OH)2 containing a small amount of dissolved Sr(OH)2 was carbonated with CO2 gas, and the effects of the reaction temperature and Sr(OH)2 on the carbonation were investigated. The higher the reaction temperature and the larger the ratio of Sr(OH)2(aq) to Ca(OH)2 (aq), which amounts to the larger the ratio of OH- to CO2(aq), the better pillar aragonite was formed. Sr(OH)2 played an important role in the formation of pillar aragonite, because it is easily formed itself into rhombic SrCO3 during the initial period of carbonation process and acting as a seed for the pillar aragonite of similar morphology. In addition, due to its substantially higher solubility compared with Ca(OH)2, OH- concentration in the carbonation mixture and subsequently CO32- necessary for the crystal growth are increased.
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KEYWORD
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