Nanocrystalline and Amorphous Calcium Carbonate from Waste Seashells by Ball Milling Mechanochemistry Processes

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2024
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Marchini, Chiara
Triunfo, Carla
Greggio, Nicolas
Fermani, Simona
Montroni, Devis
Migliori, Andrea
Gradone, Alessandro
Goffredo, Stefano
Falini, Giuseppe
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Crystal Growth & Design. ACS Publications. 2024, 24(2), pp. 657-668. ISSN 1528-7483. eISSN 1528-7505. Available under: doi: 10.1021/acs.cgd.3c01007
Zusammenfassung

Nanocrystalline calcium carbonate (CaCO3) and amorphous CaCO3 (ACC) are materials of increasing technological interest. Nowadays, they are mainly synthetically produced by wet reactions using CaCO3 reagents in the presence of stabilizers. However, it has recently been discovered that ACC can be produced by ball milling calcite. Calcite and/or aragonite are the mineral phases of mollusk shells, which are formed from ACC precursors. Here, we investigated the possibility to convert, on a potentially industrial scale, the biogenic CaCO3 (bCC) from waste mollusk seashells into nanocrystalline CaCO3 and ACC. Waste seashells from the aquaculture species, namely oysters (Crassostrea gigas, low-Mg calcite), scallops (Pecten jacobaeus, medium-Mg calcite), and clams (Chamelea gallina, aragonite) were used. The ball milling process was carried out by using different dispersing solvents and potential ACC stabilizers. Structural, morphological, and spectroscopic characterization techniques were used. The results showed that the mechanochemical process produced a reduction of the crystalline domain sizes and formation of ACC domains, which coexisted in microsized aggregates. Interestingly, bCC behaved differently from the geogenic CaCO3 (gCC), and upon long milling times (24 h), the ACC reconverted into crystalline phases. The aging in diverse environments of mechanochemically treated bCC produced a mixture of calcite and aragonite in a species-specific mass ratio, while the ACC from gCC converted only into calcite. In conclusion, this research showed that bCC can produce nanocrystalline CaCO3 and ACC composites or mixtures having species-specific features. These materials can enlarge the already wide fields of applications of CaCO3, which span from medical to material science.

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ISO 690MARCHINI, Chiara, Carla TRIUNFO, Nicolas GREGGIO, Simona FERMANI, Devis MONTRONI, Andrea MIGLIORI, Alessandro GRADONE, Stefano GOFFREDO, Helmut CÖLFEN, Giuseppe FALINI, 2024. Nanocrystalline and Amorphous Calcium Carbonate from Waste Seashells by Ball Milling Mechanochemistry Processes. In: Crystal Growth & Design. ACS Publications. 2024, 24(2), pp. 657-668. ISSN 1528-7483. eISSN 1528-7505. Available under: doi: 10.1021/acs.cgd.3c01007
BibTex
@article{Marchini2024Nanoc-68999,
  year={2024},
  doi={10.1021/acs.cgd.3c01007},
  title={Nanocrystalline and Amorphous Calcium Carbonate from Waste Seashells by Ball Milling Mechanochemistry Processes},
  number={2},
  volume={24},
  issn={1528-7483},
  journal={Crystal Growth & Design},
  pages={657--668},
  author={Marchini, Chiara and Triunfo, Carla and Greggio, Nicolas and Fermani, Simona and Montroni, Devis and Migliori, Andrea and Gradone, Alessandro and Goffredo, Stefano and Cölfen, Helmut and Falini, Giuseppe}
}
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