INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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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
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College of Civil Engineering, Fuzhou University, Fuzhou 350108, China |
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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.
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Published: 25 October 2024
Online: 2024-11-05
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Fund:National Natural Science Foundation of China (41972276, 52108307, 52378392), Natural Science Foundation of Fujian Province (2020J06013),‘Foal Eagle Program’ Youth Top-notch Talent Project of Fujian Province, China (00387088), and Qishan Scholar Project of Fuzhou University (XRC-22015). |
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