钠蒙脱石在微生物诱导碳酸钙沉淀中的作用。
Role of Na-Montmorillonite on Microbially Induced Calcium Carbonate Precipitation.
机构信息
School of Engineering and Technology, China University of Geosciences, Beijing 100083, China.
Key Laboratory of Deep Geodrilling Technology, Ministry of Land and Resources, China University of Geosciences, Beijing 100083, China.
出版信息
Molecules. 2021 Oct 14;26(20):6211. doi: 10.3390/molecules26206211.
The use of additives has generated significant attention due to their extensive application in the microbially induced calcium carbonate precipitation (MICP) process. This study aims to discuss the effects of Na-montmorillonite (Na-MMT) on CaCO crystallization and sandy soil consolidation through the MICP process. Compared with the traditional MICP method, a larger amount of CaCO precipitate was obtained. Moreover, the reaction of Ca ions was accelerated, and bacteria were absorbed by a small amount of Na-MMT. Meanwhile, an increase in the total cementing solution (TCS) was not conducive to the previous reaction. This problem was solved by conducting the reaction with Na-MMT. The polymorphs and morphologies of the CaCO precipitates were tested by using X-ray diffraction and scanning electron microscopy. Further, when Na-MMT was used, the morphology of CaCO changed from an individual precipitate to agglomerations of the precipitate. Compared to the experiments without Na-MMT in the MICP process, the addition of Na-MMT significantly reduced the hydraulic conductivity (HC) of sandy soil consolidated.
添加剂的使用因其在微生物诱导碳酸钙沉淀（MICP）过程中的广泛应用而引起了极大的关注。本研究旨在通过 MICP 过程探讨钠蒙脱石（Na-MMT）对碳酸钙结晶和砂土固结的影响。与传统的 MICP 方法相比，获得了更多量的碳酸钙沉淀。此外，钙离子的反应得到了加速，细菌被少量的 Na-MMT 吸收。同时，总胶凝溶液（TCS）的增加不利于先前的反应。通过与 Na-MMT 反应解决了这个问题。通过 X 射线衍射和扫描电子显微镜测试了碳酸钙沉淀物的多晶型和形态。进一步地，当使用 Na-MMT 时，碳酸钙的形态从单个沉淀物变为沉淀物的团聚体。与 MICP 过程中不添加 Na-MMT 的实验相比，添加 Na-MMT 显著降低了固结砂土的水力传导率（HC）。
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