Bio-mineralisation, characterization, and stability of calcium carbonate containing organic matter

Abstract

The amorphous calcium carbonate (ACC) or polycrystalline vaterite, which has long-term water stability and thermal stability, can be induced by bacteria. These biogenic CaCO3 are organo-mineral complexes.

The effect of Bacillus cereus LV-1 on the crystallization and polymorphs of calcium carbonate

“…30 In addition, a neutral pH was shown to drive calcite crystallization, while a higher pH (∼11.5) promoted the formation of vaterite. 31 Moreover, pH was respectively in the range of 8.5–9.0 and lower than 8.5 for the crystallization of vaterite 19,20 and calcite 16 in the biotic experiments. Therefore, the effect of pH value on the polymorphs of calcium carbonate is potentially related to the ratio of CO 3 2− /HCO 3 − , which may affect the structure of prenucleation clusters to crystalline polymorphs.…”

“…4), this is consistent with the results of many studies. 5,[16][17][18][19][20][21] However, there are also inconsistent results in previous studies. For example, Guo et al 22 suggested that shear force does not affect the polymorphs of calcium carbonate.…”

“…The most common experiments use standing incubation to study the mechanism of MICP, while some research has accelerated carbonate precipitation by shaking incubation to achieve specic engineering goals. 15 Previous studies 5,[16][17][18][19][20][21] have shown that calcium carbonate mineralized in the form of calcite with the participation of several bacteria under the standing condition, and precipitated in the form of unstable ACC and/or vaterite under the shaking condition (Table 1), the results between the standing and shaking conditions are different, in part, due to shear force. To the best of our knowledge, few research reports have reported the role of shear force on MICP.…”

Modification of Surfaces with Vaterite CaCO3 Particles

“…This is also observed in synthetic vaterite synthesis with the addition of LbL coatings and polymer matrices [ 46 , 83 , 84 ]. Recent findings suggest that bacteria might induce the formation of polymorphs of CaCO 3 serving as templates, and that the carbonic anhydrase, also produced by themselves, plays an essential role in the mineralization of vaterite CaCO 3 [ 85 ]. Bacterially induced CaCO 3 mineralization is thought to be important in a range of processes and the study [ 85 ] indicates that Myxococcus xanthus , a soil bacterium, facilitates the formation of spherical vaterite CaCO 3 .…”

“…Recent findings suggest that bacteria might induce the formation of polymorphs of CaCO 3 serving as templates, and that the carbonic anhydrase, also produced by themselves, plays an essential role in the mineralization of vaterite CaCO 3 [ 85 ]. Bacterially induced CaCO 3 mineralization is thought to be important in a range of processes and the study [ 85 ] indicates that Myxococcus xanthus , a soil bacterium, facilitates the formation of spherical vaterite CaCO 3 . The production of CO 2 and NH 3 by bacteria, the transformation of NH 3 to NH 4 + , and the presence of OH − , leads to increased basicity, leading to the physiochemical conditions favourable for vaterite precipitation onto the surface of bacteria [ 86 ].…”