New mechanistic insight on the synthesis of metal carbonates by laser ablation in ethanol

[Display omitted] •Lead and bismuth carbonate nanostructures obtained by laser ablation in ethanol;•New mechanistic understanding about carbonate precipitation by ablation in alcohols;•Evidence of atmospheric carbon dioxide adsorption mediated by ethoxide mechanism;•Evidence that alcohol decompositi...

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Bibliographic Details
Published in:Materials letters 2023-08, Vol.344, p.134365, Article 134365
Main Authors: Ferreira, A.F., Falcão, E.H.L., de Azevedo, W.M.
Format: Article
Language:English
Subjects:
Bismutite
Carbon dioxide
Ethoxide
Hydrocerussite
Nanostructures
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Summary:[Display omitted] •Lead and bismuth carbonate nanostructures obtained by laser ablation in ethanol;•New mechanistic understanding about carbonate precipitation by ablation in alcohols;•Evidence of atmospheric carbon dioxide adsorption mediated by ethoxide mechanism;•Evidence that alcohol decomposition is not source of CO2. We present new results concerning the formation mechanism of lead carbonate (Pb3(CO3)2(OH)2) by laser ablation in ethanol, under controlled atmospheres. We suggest that carbon dioxide (CO2) is absorbed from ambient atmosphere and converted into carbonate in a reaction mediated by ethoxide anion produced during the ablation. Addition of 2,4,6 trinitrotoluene to the ablated solution and its subsequent reduction, followed by UV–Vis spectroscopy, supports this new mechanism. No carbonate precipitates under Ar or O2 atmospheres. Ablation of Pb, PbO, Bi or Bi2O3 targets in ethanol were also carried out. The precipitated powder samples were analyzed by XRD, FTIR, Raman, SEM. The results showed that hydrocerussite (Pb3(CO3)2(OH)2) and bismutite (Bi2O2(CO2)3) nanostructures were obtained, demonstrating that carbonates can be obtained from metals and metal oxide sources.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2023.134365