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Minerals 2017, 7(2), 23; https://doi.org/10.3390/min7020023

Dissolution and Sorption Processes on the Surface of Calcite in the Presence of High Co2+ Concentration

1
Department of Geology, University of Oviedo, Calle Arias de Velasco s/n, Oviedo 33005, Spain
2
Department of Geology & Geoenvironment, National and Kapodistrian University of Athens, Zographou Campus, 15784 Athens, Greece
3
Surface Science Laboratory, Department of Chemical Engineering, University of Patras, 26504 Patras, Greece
4
Tandem Accelerator Laboratory, Institute of Nuclear Physics, NCSR ‘‘DEMOKRITOS”, GR-15310 Attiki, Greece
5
Department of Chemistry, National and Kapodistrian University of Athens, Zografou Campus, 15771 Athens, Greece
*
Author to whom correspondence should be addressed.
Academic Editor: Huifang Xu
Received: 31 October 2016 / Revised: 26 January 2017 / Accepted: 10 February 2017 / Published: 15 February 2017
(This article belongs to the Special Issue Mineral Surface Science and Nanogeoscience)
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Abstract

The interaction of the calcite surface with Co2+-rich aqueous solutions ([Co2+aq]initial = 1000 ppm, i.e., ca. 17 mM) was investigated by means of macroscopic experiments and surface spectroscopic techniques. In the case of the macroscopic experiments, calcite powder and monocrystals were immersed into solutions for different time periods (from 1 min to one month). The Ca concentrations in the filtrates was measured by means of atomic absorption spectrometry (AAS) while the interacted solids were studied using a combination of X-ray photoelectron spectroscopy (XPS) and 12C-rutherford backscattering spectrometry (12C-RBS). The macroscopic data showed a characteristic surface dissolution process, in parallel to the surface sorption processes. Adsorption and co-precipitation were seen for almost the entire immersion period for both calcite powder and monocrystals. The surface study by XPS (analyzed at a depth of approximately 12 nm) suggested that adsorption takes place in the first hour of the interaction, followed by incorporation of Co2+ into calcite surface layers, leading to the formation of a Co2+-bearing surface (co)precipitate, which occurs over a period of hours and days. The 12C-RBS measurements on calcite { 10 1 ¯ 4 } indicated that the thickness of this surface co-precipitate was 270 nm after one day and then stabilized at 320 nm after more than a week. View Full-Text
Keywords: calcite; surface; cobalt; dissolution; adsorption; surface co-precipitation; photoelectron spectroscopy; Rutherford backscattering calcite; surface; cobalt; dissolution; adsorption; surface co-precipitation; photoelectron spectroscopy; Rutherford backscattering
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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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González-López, J.; Fernández-González, Á.; Jiménez, A.; Godelitsas, A.; Ladas, S.; Provatas, G.; Lagogiannis, A.; Pasias, I.N.; Thomaidis, N.S.; Prieto, M. Dissolution and Sorption Processes on the Surface of Calcite in the Presence of High Co2+ Concentration. Minerals 2017, 7, 23.

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