纳米四氧化三铁对微生物诱导碳酸钙沉淀的作用效果与机理研究

doi:10.11896/cldb.23040018

材料导报

2024, Vol. 38

Issue (20): 23040018-8 https://doi.org/10.11896/cldb.23040018

无机非金属及其复合材料

纳米四氧化三铁对微生物诱导碳酸钙沉淀的作用效果与机理研究

李爽, 黄明^*, 崔明娟, 胡鑫杭, 许凯, 姜启武

福州大学土木工程学院,福州 350108

Study on the Effect and the Mechanism of Nano-Fe₃O₄ on Microbially Induced Calcium Carbonate Precipitation

LI Shuang, HUANG Ming^*, CUI Mingjuan, HU Xinhang, XU Kai, JIANG Qiwu

College of Civil Engineering, Fuzhou University, Fuzhou 350108, China

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摘要微生物诱导碳酸钙沉淀(MICP)是环境岩土工程领域一项新型的土体加固技术。微生物的生长及活性会受到外部磁场的影响,改变MICP中碳酸钙的晶型晶貌及沉淀方式,从而对碳酸钙的胶结性能产生影响。采用纳米四氧化三铁(Nano-Fe₃O₄),设计了Nano-Fe₃O₄作用下的微生物诱导碳酸钙沉淀的水溶液及MICP砂土固化试验,对比分析了Nano-Fe₃O₄含量对微生物诱导生成的碳酸钙晶体含量(CCC)、类型、比例以及MICP固化砂土力学强度等参数的影响规律,并结合扫描电镜(SEM)试验分析了溶液环境及砂柱中碳酸钙的微观形貌特征,系统归纳了Nano-Fe₃O₄对MICP的作用效果及机制。结果表明:(1)Nano-Fe₃O₄能够有效改善细菌的新陈代谢性能,显著提高细菌OD₆₀₀及脲酶活性;(2)溶液环境中,MICP产生的碳酸钙晶体类型以球霰石为主,含少量方解石,且Nano-Fe₃O₄含量增加能够促进球霰石的生成及增大MICP沉淀物中稳定相碳酸钙所占的比例;(3)Nano-Fe₃O₄可以显著提高MICP固化砂土的无侧限抗压强度和CCC;(4)SEM分析结果表明,溶液环境中,碳酸钙晶体以球型堆积为主,MICP固化砂柱中碳酸钙晶型随Nano-Fe₃O₄含量的增加逐渐呈菱柱状堆积。

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关键词: 微生物诱导碳酸钙沉淀(MICP) 纳米四氧化三铁晶体类型与形貌细菌脲酶活性溶液环境 MICP固化砂土

Abstract: Microbially induced carbonate precipitation (MICP) is a promising technique in geoenvironmental engineering. The metabolic activity of bacteria is sensitive to external magnetic fields, which will affect the CaCO₃ crystal morphology. Therefore, nano-Fe₃O₄ was utilized to investigate the influence of magnetic materials on MICP. Both MICP in solution environment and MICP on a quartz sand surface were investigated with different nano-Fe₃O₄ content. The calcium carbonate content (CCC), crystal types and unconfined compressive strength were analyzed by scanning electron microscope (SEM) and uniaxial compression test. Furthermore, a series of tests were conducted to reveal the mechanism of the effect of nano-Fe₃O₄ on MICP. The results showed that the optical density at 600 nm of bacteria (OD₆₀₀) and bacterial activity increased with an increase in nano-Fe₃O₄ content. In the solution environment, the crystal type of CaCO₃ was primarily vaterite, with little calcite, and it was confirmed by TG-DTA testing that nano-Fe₃O₄ could facilitate the formation of vaterite. Additionally, the unconfined compressive strength (UCS) and calcium carbonate content of MICP-treated sand increased with an increase in nano-Fe₃O₄ content. Interestingly, CaCO₃ presented in the form of spheres in the solution environment, while it was in the form of rhomboid imbricate on the surface of quartz sand particles.

Key words: microbially induced carbonate precipitation (MICP) nano-Fe₃O₄ crystal type and morphology bacterial urease activity solution environment MICP-treated sand

出版日期: 2024-10-25 发布日期: 2024-11-05

ZTFLH:

TU526

基金资助: 国家自然科学基金(41972276;52108307;52378392);福建省自然科学基金(2020J06013);福建省“雏鹰计划”青年拔尖人才项目(00387088);福州大学“旗山学者”项目(XRC-22015)

通讯作者: * 黄明,国家级青年人才,福州大学土木工程学院教授、岩土工程研究所所长、博士研究生导师。博士毕业于重庆大学,2010年至今就职于福州大学土木工程学院。目前主要从事:(1)微生物岩土工程的理论基础与技术开发;(2)盾构渣土改良及渣土再利用技术研究;(3)城市地铁盾构/TBM隧道掘进稳定性计算与安全控制;(4)复杂环境下隧道动态施工力学效应分析与灾害防治。主持国家自然科学基金项目4项,参与1项(排名3),省部级课题6项,获省部级科技进步奖5项。发表国内外高水平论文80余篇,其中SCI/EI收录50余篇,授权国家专利20余项,包括Tunnelling and Underground Space Technology、Rock Mechanics and Rock Engineering、Journal of Rock Mechanics and Geotechnical Engineering、Acta Geotechnica、Journal of Geotechnical and Geoenvironmental Engineering、《岩土力学》《岩石力学与工程学报》《工程地质学报》等。huangming05@fzu.edu.cn

作者简介: 李爽,福州大学土木工程学院2020级博士研究生,在黄明教授的指导下进行研究。主要研究领域为微生物岩土工程技术,方向为生物酶矿化胶结回填材料传热机制与服役性能。

引用本文:

李爽, 黄明, 崔明娟, 胡鑫杭, 许凯, 姜启武. 纳米四氧化三铁对微生物诱导碳酸钙沉淀的作用效果与机理研究[J]. 材料导报, 2024, 38(20): 23040018-8.
LI Shuang, HUANG Ming, CUI Mingjuan, HU Xinhang, XU Kai, JIANG Qiwu. Study on the Effect and the Mechanism of Nano-Fe₃O₄ on Microbially Induced Calcium Carbonate Precipitation. Materials Reports, 2024, 38(20): 23040018-8.

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http://www.mater-rep.com/CN/10.11896/cldb.23040018 或 http://www.mater-rep.com/CN/Y2024/V38/I20/23040018

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