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

2023; Elsevier BV; Volume: 344; Linguagem: Inglês

10.1016/j.matlet.2023.134365

1873-4979

Aldebarã Fausto Ferreira, E.H.L. Falcão, W.M. de Azevêdo,

Aerogels and thermal insulation

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.