由从埃及分离出来的细菌诱导的CaCO3生物矿化过程,用于可持续的生物混凝土
Dalia Said1, Sahar M Ibrahim2, Mohamed Heikal3
1Botany and Microbiology Department, Faculty of Science, Benha University, Benha, Egypt.
Microbial cell factories
|September 16, 2025
概括
研究人员确定了Bacillus tropicus菌株D16的有效碳酸沉 (CaCO3). 这种菌株的
科学领域:
- 地质技术工程 地质技术工程
- 材料科学 材料科学 材料科学
- 微生物学 微生物学
背景情况:
- 微生物诱导的碳酸沉 (MICP) 对于建筑和地质技术应用至关重要.
- 热带杆菌菌株D16从埃及的瓦迪埃尔-纳特朗湖中分离出来.
- 该研究调查了MICP在增强水泥材料方面的潜力.
研究的目的:
- 为了分离和描述具有高碳酸沉能力的细菌.
- 为最有效的细菌菌株优化生长条件.
- 为了评估沉碳酸纳米颗粒 (CaCO3-NP) 对水泥糊性能的影响.
主要方法:
- 24种细菌菌株的分离和表征.
- 为Bacillus tropicus D16.16优化生长条件 (pH,Ca2+,尿素,温度) 进行研究.
- 使用SEM,EDX,FT-IR,XRD和BET进行CaCO3的量化和表征.
- 用不同的CaCO3-NP剂量 (NC0.0-NC1.5) 制备和测试水泥糊.
- 评估水泥糊的性能:压力强度,散装密度,多孔性和含水量长达90天.
- 使用XRD,DTG/TGA和SEM进行微结构和相位分析.
主要成果:
- 热带菌D16显示了最高的CaCO3沉量 (0.404g/100mL),在pH8,30°C,25mMCa2+和20g/L尿素下增长最佳.
- CaCO3-NPs增强了水泥糊的压力强度,达到0.5%的最佳剂量.
- 较高剂量的CaCO3-NP导致由于聚合而导致强度降低.
- 微结构分析证实了最佳的CaCO3-NP含量的积极影响.
结论:
- 热带杆菌D16是MICP应用的一个有前途的代理.
- 最佳剂量的CaCO3-NP显著提高了水泥的性能.
- MICP提供了一种可持续的方法来增强建筑材料.
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