微生物诱导碳酸钡沉淀

摘要

利用巴斯德芽孢杆菌繁殖过程产生的酶化作用,适时引入Ba2+,形成碳酸钡沉淀,通过用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、傅里叶变换红外光谱(FTIR)、综合热分析仪(DSC-TC)对碳酸钙样品形貌、结构、热性质等进行表征.结果表明,巴斯德芽孢杆菌诱导沉淀的碳酸钡与纯水中的不同,含有少量有机物质,晶形转变温度降低.主要为花簇状和放射状,属于正交晶系.菌体和代谢物在碳酸钡晶体成核、生长及堆积过程中扮演重要的角色.%The barium carbonate precipitate was induced using enzymes in the bacillus pasteurii reproduction and morphology,structure and thermal decomposition properties of the barium carbonate precipitates were characterized by SEM,FTIR,XRD,DSC-TG.The results indicate that barium carbonate (BaCO3) precipitate induced in bacillus pasteurii differs from the one induced in pure water.The BaCO3 crystals induced in bacillus pasteurii has orthorhombic crystalline structure and contains a small amount of organic matters,its crystal transition temperature decreases and shows morphologies of flower clusters and radial patterns.Bacteria and metabolites play important roles in the process of crystal nucleation,growth and accumulation of BaCO3.