Time-of-flight secondary ion mass spectrometry study of zinc carbonation in the presence of stable oxygen-18 and deuterium isotopes

Zinc foil was carbonated in supercritical CO2 in the presence of water containing stable 18O or deuterium isotopes. The carbonation resulted in precipitation of zinc carbonate crystals with hexagonal and cubic morphologies until the source of hydroxyl groups was depleted. Time-of-flight secondary io...

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Bibliographic Details
Published in:Materials chemistry and physics 2020-12, Vol.256, p.123673, Article 123673
Main Authors: Saarimaa, Ville, Kaleva, Aaretti, Nikkanen, Juha-Pekka, Levänen, Erkki, Väisänen, Pasi, Markkula, Antti
Format: Article
Language:English
Subjects:
18O-water
Carbonation
Carbonic acid
Chemical composition
Deuterium
Hydroxyl groups
Ions
Mass spectrometry
Metal foils
Metal hydroxides
Molecular spectroscopy
Morphology
Oxygen isotopes
Precipitates
Scientific imaging
Secondary ion mass spectrometry
Supercritical carbon dioxide
ToF-SIMS
Zinc
Zinc foil
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Summary:Zinc foil was carbonated in supercritical CO2 in the presence of water containing stable 18O or deuterium isotopes. The carbonation resulted in precipitation of zinc carbonate crystals with hexagonal and cubic morphologies until the source of hydroxyl groups was depleted. Time-of-flight secondary ion mass spectrometry was utilized to map the isotopes in the precipitates. The isotopes were detected in the precipitated structures, which confirms the formation of carbonic acid as the initial corrosion procedure step, followed by zinc dissolution. This finally leads to the arrangement of zinc ions with carbonate ions, and storage of OH-groups between ZnCO3 layers as Zn(OH)2 or molecular water. The results completed chemical composition data obtained with molecular spectroscopy. Mapping of the distribution of hydrogen and oxygen isotopes by ToF-SIMS provided essential information on the reaction routes of carbonation in a humid scCO2 environment. [Display omitted] •18O and deuterium isotopes were used to study reaction routes in humid supercritical carbon dioxide carbonation.•Isotopes in the formed reaction products were mapped by ToF-SIMS.•The presence of hydroxyl groups was unambiguously observed in Zn carbonate nanowires.•Zn carbonate was discerned from zinc hydroxy carbonate by ToF-SIMS mapping of deuterium.•ToF-SIMS is an efficient tool to investigate reaction routes in synthesis of novel nanomaterials.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2020.123673