Effect of Carbonic Anhydrase on CaCO3 Crystallization in Alkaline Solution

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• 作者：Murat Molva ; Sevgi Kilic ; Ekrem Ozdemir
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：December 15, 2016
• 年：2016
• 卷：30
• 期：12
• 页码：10686-10695
• 全文大小：681K
• ISSN：1520-5029

文摘

The effect of bovine carbonic anhydrase (CA) on calcium carbonate (CaCO₃) crystallization was investigated. A new method was developed to estimate the biocatalytic activity of CA in alkaline solution. The CA was immobilized within polyurethane (PU) foam, and compared its biocatalytic activity with the free-CA and bare-PU foam. A minireactor was created in a calcium hydroxide (Ca(OH)₂) solution in order to control the CO₂ transfer rate, and reproducible results were obtained. It was found that the free-CA lost its activity in less than 6 min at pH 12.5 in alkaline Ca(OH)₂ solution. The CaCO₃ crystallization rates for the immobilized-CA were found to be a U-shape, relatively lower at lower immobilized-CA amounts compared to those for the free-CA and bare-PU foam and higher when the amount of immobilized-CA increased. It was concluded that a higher immobilized-CA amount is required to accelerate the CaCO₃ crystallization rates in Ca(OH)₂ solution.