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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 39, Number 7
JKCSEZ 39(7)
February 20, 1995 

Studies on the Preparation of Aragonite (Ⅰ). Formation of Aragonite of Pillar Shape

Aragonite의 제조에 관한 연구 (Ⅰ). 주상형 아라고나이트의 생성
Seoung-Sik Park, Ho Ha, Hee-Cheol Lee

박성식, 하 호, 이희철
Sr(OH)2가 소량 첨가된 수산화칼슘 수용액에 CO2 가스를 흡수시켜 탄산화반응을 행하였으며, 이 반응에서 반응온도와 Sr(OH)2가 탄산화반응에 미치는 영향을 조사하였다. 주상형의 aragonite는 반응온도가 높을 수록, Sr(OH)2(aq)/Ca(OH)2 (aq)의 비가 클 수록, 즉 OH-/CO2(aq)의 비가 클 수록, 잘 생성되었다. Sr(OH)2는 탄산화반응 초기에 aragonite와 유사한 사방정형의 SrCO3를 쉽게 형성하고, 물에 대한 용해도가 높기 때문에 OH-이온을 증가시켜 용액내에 결정성장에 유리한 CO32- 이온을 보다 쉽게 형성시키므로 주상형 aragonite 생성에 유리한 역할을 하였다.

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.

578 - 584
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