Physical-chemical study of IPETC and PAX collector's adsorption on covellite surface

Yesica L. Botero*, Andrés Canales-Mahuzier, Rodrigo Serna-Guerrero, Alejandro López-Valdivieso, Mostafa Benzaazoua, Luis A. Cisternas

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)
16 Downloads (Pure)

Abstract

The adsorption mechanisms of the collectors O-isopropyl-N-ethyl thionocarbamate (IPETC) and potassium amyl xanthate (PAX) on a covellite surface were studied through microflotation tests, Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations. The microflotation test demonstrated that the collectors have a marked effect on the covellite flotation and that covellite flotation is not pH-dependent. The FT-IR spectra for covellite treated with IPETC and PAX collectors at pH 8 and 11 does not differ significantly. For IPETC, the leading adsorption –C(=S) –NH group vibration was identified, and the NH stretching band is absent from both spectra. The spectra show the frequencies for the PAX, Cu-amylxanthate (CuAX), and (AX)2 dixantogen that formed. The XPS spectra showed that the adsorption mechanism of PAX on the covellite surface is principally through C 1 s and S 2p. The adsorption mechanism of IPETC on the covellite surface suggests that the bond is enabled through the[dbnd]S element of the collector with Cu atoms in the covellite surface. Finally, the DFT calculations predict that for IPETC the bond with copper only occurred through the C[dbnd]S group. For PAX, the bond with copper occurred through the C[dbnd]S and C–S groups.

Original languageEnglish
Article number154232
JournalApplied Surface Science
Volume602
Early online date28 Jul 2022
DOIs
Publication statusPublished - 15 Nov 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • Amyl xanthate
  • Collector adsorption
  • Covellite
  • Density functional theory
  • Thionocarbamate

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