Microbial‐induced synthesis of mineralization products based on the capture of carbon dioxide: Characteristics, reaction kinetics, interfacial adhesion properties, and mechanism of action

Abstract

AbstractAs a new type of green environment‐friendly cementitious material, microbial‐induced mineralization products have garnered more and more attention. In this paper, the synthesis of mineralization products under microbial inducement was conducted. The composition and microstructure of mineralization products were studied using energy‐dispersive spectrometer (EDS), X‐ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscope (TEM). The results showed that mineralization products were calcite, while the shape was similar to globular type, and particle size was about 5 μm. The effect of microbial culture solution, secretion solution, and concentration on the conductivity of the solution was compared and analyzed. During the formation of mineralization products, bacterial bodies not only played the role of nucleation sites but also accelerated the deposition of mineralization products. Thus, it could be seen that the bacterial bodies had a certain influence on the reaction kinetics. The adhesion force of mineralization products was evaluated by the interfacial adhesion properties between the mineralization products and glass slides. The results of the sonication test and scratch test indicated that the interfacial adhesion strength between mineralization products and glass slides was closely related to the mass of mineralization products deposited. The larger the mass of mineralization products deposited, the greater the interfacial adhesion strength. Based on the above research and analysis, the reaction process and mechanism model of microbial‐induced mineralization were defined.