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Crystals 2019, 9(1), 16; https://doi.org/10.3390/cryst9010016

Synthesis and Adsorbing Properties of Tabular {001} Calcite Crystals

1
Laboratory for Precipitation Processes, Division of Materials Chemistry, Ruđer Bošković Institute, P. O. Box 180, HR-10002 Zagreb, Croatia
2
Dipartimento di Chimica “Giacomo Ciamician”, Alma Mater Studiorum-Universitá di Bologna, via Selmi 2, 40126 Bologna, Italy
*
Author to whom correspondence should be addressed.
Received: 12 November 2018 / Revised: 20 December 2018 / Accepted: 22 December 2018 / Published: 27 December 2018
(This article belongs to the Special Issue Biological Crystallization)
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Abstract

One of the most common crystal habits of the thermodynamically stable polymorph of calcium carbonate, calcite, is the rhombohedral one, which exposes {10.4} faces. When calcite is precipitated in the presence of Li+ ions, dominantly {00.1} faces appear together with the {10.4}, thus generating truncated rhombohedrons. This well-known phenomenon is explored in this work, with the aim of obtaining calcite crystals with smooth {00.1} faces. In order to achieve this objective, the formation of calcite was examined in precipitation systems with different c(Ca2+)/c(Li+) ratios and by performing an initial high-power sonication. At the optimal conditions, a precipitate consisting of thin, tabular {001} calcite crystals and very low content of incorporated Li+ has been obtained. The adsorption properties of the tabular crystals, in which the energetically unstable {00.1} faces represent almost all of the exposed surface, were tested with model dye molecules, calcein and crystal violet, and compared to predominantly rhombohedral crystals. It was found that the {00.1} crystals showed a lower adsorption capability when compared to the {10.4} crystals for calcein, while the adsorption of crystal violet was similar for both crystal morphologies. The obtained results open new routes for the usage of calcite as adsorbing substrates and are relevant for the understanding of biomineralization processes in which the {00.1} faces often interact with organic macromolecules. View Full-Text
Keywords: calcium carbonate; {00.1} calcite; lithium ions; ultrasonic irradiation; vaterite transformation; adsorption; calcein; crystal violet calcium carbonate; {00.1} calcite; lithium ions; ultrasonic irradiation; vaterite transformation; adsorption; calcein; crystal violet
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Matijaković, N.; Magnabosco, G.; Scarpino, F.; Fermani, S.; Falini, G.; Kralj, D. Synthesis and Adsorbing Properties of Tabular {001} Calcite Crystals. Crystals 2019, 9, 16.

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