Precipitation of CaCO3 Polymorphs from Aqueous Solutions: The Role of pH and Sulphate Groups

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dc.contributor.authorCuesta Mayorga, Iris
dc.contributor.authorAstilleros García-Monge, José Manuel
dc.contributor.authorFernández Díaz, María Lourdes
dc.date.accessioned2023-06-17T13:27:27Z
dc.date.available2023-06-17T13:27:27Z
dc.date.issued2019-03-13
dc.description.abstractIn this work, we aimed to experimentally study the nucleation and growth of CaCO3 phases precipitated from supersaturated aqueous solutions in the presence of varying concentrations of sulphate oxyanion. The experiments were conducted under pH conditions close to neutral (7.6) and by considering a wide range of initial (SO42−)/(CO32−) ratios (0 to approx. 68) in the aqueous solution. We paid special attention to the evolution of the precipitates during ageing within a time framework of 14 days. The mineralogy, morphology, and composition of the precipitates were studied by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and EDX microanalysis. The concentration of sulphate ions in the reacted aqueous solution was studied by ICPs. The experimental results showed that the mineral composition of the precipitate recovered in each run varied with the (SO42−)/(CO32−) ratio in the parental solution, which influenced the mineral evolution of the precipitates during ageing. We observed that high concentrations of sulphate in the aqueous solution stabilized the vaterite precipitates and inhibited calcite formation. Furthermore, aragonite never precipitated directly from the solution, and it was only formed via a dissolution-precipitation process in solutions with a high (SO42−)/(CO32−) ratio after long reaction times. Finally, gypsum only precipitated after long ageing in those aqueous solutions with the highest concentration of sulphate. The reaction pathways during ageing, the morphology of the calcite crystals, and the composition of vaterite and calcite were discussed considering both kinetic and thermodynamic factors. These results showed a considerably more complex behavior of the system than that observed in experiments conducted under higher pHs and supersaturation levels and lower (SO42−)/(CO32−) ratios in the aqueous phase.
dc.description.departmentDepto. de Mineralogía y Petrología
dc.description.facultyFac. de Ciencias Geológicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Ciencia e Innovación (MICINN)
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/56911
dc.identifier.doi10.3390/min9030178
dc.identifier.issn2075-163X
dc.identifier.officialurlhttps://www.mdpi.com/2075-163X/9/3/178
dc.identifier.urihttps://hdl.handle.net/20.500.14352/13531
dc.issue.number3
dc.journal.titleMinerals
dc.language.isoeng
dc.page.initial178
dc.publisherMDPI
dc.relation.projectID(CGL2016-77138-C2-1-P. I); (BES-2014-070279)
dc.rightsAtribución 3.0 España
dc.rights.accessRightsopen access
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/es/
dc.subject.cdu549.742.111
dc.subject.keywordCaCO3 polymorphs
dc.subject.keywordsulphate
dc.subject.keywordageing process
dc.subject.keywordaragonite
dc.subject.keywordgypsum
dc.subject.ucmMineralogía (Geología)
dc.subject.unesco2506.11 Mineralogía
dc.titlePrecipitation of CaCO3 Polymorphs from Aqueous Solutions: The Role of pH and Sulphate Groups
dc.typejournal article
dc.volume.number9
dspace.entity.typePublication
relation.isAuthorOfPublicationac905cea-e7bd-4708-897e-df7887776892
relation.isAuthorOfPublication04510d2c-6771-46a3-a807-f37e2932fb09
relation.isAuthorOfPublication5283531a-5de9-4e87-bcc7-1c218b2d3a89
relation.isAuthorOfPublication.latestForDiscoveryac905cea-e7bd-4708-897e-df7887776892
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