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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (19): 2133-2138. 上一篇    下一篇

研究论文

碳酸岩矿化菌诱导碳酸钙晶体形成机理研究

成亮*, 钱春香, 王瑞兴, 王剑云   

  1. (东南大学材料科学与工程学院 南京 211189)
  • 投稿日期:2006-11-23 修回日期:2007-05-21 发布日期:2007-10-14
  • 通讯作者: 成亮

Study on the Mechanism of Calcium Carbonate Formation Induced by Carbonate-mineralization Microbe

CHENG Liang*; QIAN Chun-Xiang; WANG Rui-Xing; WANG Jian-Yun   

  1. (Department of Materials Science and Engineering, Southeast University, Nanjing 211189)
  • Received:2006-11-23 Revised:2007-05-21 Published:2007-10-14
  • Contact: CHENG Liang

PDF

2071

被引次数

44

选用碳酸盐矿化菌(芽孢杆菌系), 分别研究了不同浓度细菌液、细菌体及其分泌物对碳酸钙晶体形成的影响. 研究表明, 细菌液浓度越高, 控制碳酸钙晶体形貌作用越显著; 细菌体为碳酸钙结晶提供异相成核点而对形貌并没有实质影响; 细菌分泌物可诱导出球形、纺锤形等多种形态亚稳态球霰石; 在微生物环境的长期作用下可形成有机-无机复合碳酸钙硬质膜. 通过对电导率测定结果和碳酸钙红外图谱分析得出, 生物有机质分子链的极性基团(COOH, C＝O等)与Ca2＋产生静电、配位等一系列作用, 调控晶体的生长. 本研究对于微生物诱导碳酸钙的工程性应用, 如混凝土微裂缝修复、古建筑表面防护处理、微纳米碳酸钙颗粒制备等具有一定指导意义.

关键词: 生物矿化, 碳酸岩矿化菌, 碳酸钙, 有机质调控

Carbonate-mineralization microbe (Bacillus) was chosen to study the influences of concentration of bacteria solution, bacteria body and bacterial secretion on calcium carbonate crystal formation. Results showed that the effect was stronger as the concentration of bacteria increasing; the crystals’ form could not be affected by bacteria body only, but the bacterial secretion could induce the formation of polymorphic (e.g. spherical and spindle) metastable vaterite; inorganic-organic composite CaCO3 film formed under long-term effect by microbe. Based on the results of solution conductivity and FT-IR spectra of CaCO3 crystals, it could be concluded that there were electrostatic and coordination interaction between polar groups (COOH, C＝O) in protein molecule and Ca2＋. The results are useful for engineering application, such as repairing micro-crack on concrete surface, protecting old building surface and producing micron and nano calcium carbonate grains.

Key words: biomineralization, carbonate-mineralization microbe, calcium carbonate, organic matter-me- diation