A study of the effects of NH₄⁺ on the fast precipitation of vaterite CaCO₃ formed from steamed ammonia liquid waste and K₂CO₃/Na₂CO₃

Abstract

Vaterite-phase calcium carbonate (CaCO3) has many unique properties, such as high solubility, spherical shape, large surface areas, and porosity, giving it more industrial applications than calcite and aragonite-type polymorphs. However,...

Synthesis and Characterization of Porous CaCO3 Vaterite Particles by Simple Solution Method

“…Na + and NO 3 − ions could be adsorbed in the original primary vaterite nanosize particles surface inside the microsphere and consequently prevent the crystal growth polymorph and phase transformation. A similar mechanism was reported using Na 2 CO 3 as a carbon source that ions such as NH 4 + ions are able to control the growth of primary particles [42]. In this case, the particle growth mechanism of spherulites of vaterite was found to be dependent on the crystal surface structure.…”

Purification of Intramineral Peptides from Cuttlebones and In Vitro Activity in CaCO3 Biomineralization

“…At high concentrations of SOMs (50, 500, and 1000 μg/mL), diffractions at 2θ = 24.5, 26.6, and 32.4°were observed corresponding to the presence of vaterite crystallographic planes (110), (112), and (114) (Figure 3f(iii−v); PDF # 33-0268). At the same time, the decrease in intensity of the calcite peak at 29.2°(104) 44,45 indicates the nucleation of a lower number of calcite crystals at high concentrations of SOMs (Figure 3f(iii−v), PDF # 05-0586).…”

“…The diffraction peak at 29.4°i s assigned to the (104) plane of the calcite lattice (Figure 6f(i)). 44 In the case of crystals grown in the presence of the peptide and Mg ions, diffraction peaks were observed at 2θ = 29.5°, 32.7°, and 45.5°, indicating the presence of aragonite crystal lattice planes of (112), (114), and (008), respectively (Figure 6f(ii−vi)). 51,52 These results are in good agreement with the data reported in the literature.…”

“…Upon increasing the concentration to 50 μg/mL, the rhombohedral crystals were aggregated to form large crystals (Figure b). At high concentrations of SOMs (i.e., 500 and 1000 μg/mL), large numbers of small rhombohedral calcite crystals aggregated to form spherical crystals with more smooth surface morphologies (Figure c,d). − Increasing the concentration of SOMs allows the small calcite crystals to stick together with the help of these intramineral proteins and form large spherical crystal aggregates with rough surfaces. , Since relative sizes of the crystals in Figure a and aggregates in Figure d are the same, it is possible that at high concentration of SOMs, the peptides present in the SOMs facilitate aggregation of crystallites. Such process implies strong interactions between the peptides in SOMs and growing crystal surfaces.…”

“…39−43 Increasing the concentration of SOMs allows the small calcite crystals to stick together with the help of these intramineral proteins and form large spherical crystal aggregates with rough surfaces. 20,44 Since relative sizes of the crystals in Figure 2a and aggregates in Figure 2d are the same, it is possible that at high concentration of SOMs, the peptides present in the SOMs facilitate aggregation of crystallites. Such process implies strong interactions between the peptides in SOMs and growing crystal surfaces.…”