Effect of anionic ligands on the reactivity of pyrite with Fe(III) ions in acid solutions

Keiko Sasaki, M. Tsunekawa, K. Hasebe, H. Konno

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The reactivity of pyrite with Fe(III) ions in solutions of pH around 2 containing anionic species was evaluated by the determination of released Fe(II) ions, and by surface analysis of pyrite using X-ray photoelectron spectroscopy (XPS). The release of Fe(II) ions decreased with increasing concentration of total anionic species, and the suppression of pyrite dissolution was in the order chloride<sulfate⋘phosphate≈oxalate. The Fe(III)-CDTA and [Fe(CN)6]3- complexes did not function as oxidants. For [Fe(CN)6]3-, the results were explained by a mechanism based on molecular orbital theory, since the complex is inert and of low-spin type. For the others, the order of suppression was found to be in parallel with the order of potential as oxidant, the standard redox potential,E0. The redox couples of Fe(III)-CDTA and Fe(III)-oxalate complexes have lowerE0 values and this is considered to be the reason for no oxidation. In the phosphate system, colloid formation and polynucleation of Fe(III) ions were observed and these were additional factors in the suppression. The experimental results and the calculatedE0 values indicate thatE0 for SO42- /pyrite-S may be around 0.3 V. This means thatE0 is an important measure for estimating the ligand effect.

Original languageEnglish
Pages (from-to)39-49
Number of pages11
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume101
Issue number1
DOIs
Publication statusPublished - Aug 15 1995
Externally publishedYes

Fingerprint

Pyrites
pyrites
reactivity
Ligands
Ions
ligands
acids
Acids
retarding
Oxidants
ions
Oxalates
Surface analysis
Colloids
Molecular orbitals
oxalates
colloids
Chlorides
molecular orbitals
phosphates

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Effect of anionic ligands on the reactivity of pyrite with Fe(III) ions in acid solutions. / Sasaki, Keiko; Tsunekawa, M.; Hasebe, K.; Konno, H.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 101, No. 1, 15.08.1995, p. 39-49.

Research output: Contribution to journalArticle

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