Electron shuttles stimulate the reductive dissolution of jarosite by Acidiphilium cryptum

ERNESTO ALEJANDRO GONZALEZ ROMO, Loreto Hernández, Jesús Ángel Muñoz, María Luisa Blázquez, Antonio Ballester, Felisa González

Research output: Contribution to journalArticlepeer-review

Abstract

Jarosite is stable under oxidizing conditions at low pH, but Acidiphilium cryptum can promote its reductive dissolution to Fe(II). Since electron shuttles enhance the bioreduction of iron oxides at circumneutral pH, nine compounds were selected to study their effect on jarosite dissolution at low pH. Gallocyanine, methylene blue and thionine stimulated the bioreduction of jarosite by factors of four, six and ten, respectively. Cyclic voltammetry test at pH 2.5 showed that these three compounds have a half-wave potential in the range 276–375 mV vs SHE. Similar results have been reported for neutrophiles, although the range obtained in this work was shifted to positive values. This behavior would be related to the ability of A. cryptum to reduce electron shuttles and thermodynamic data for reduction of ferric compounds.

Original languageEnglish
Article number105351
JournalHydrometallurgy
Volume194
DOIs
StatePublished - Jun 2020
Externally publishedYes

Keywords

  • Acidiphilium cryptum
  • Cyclic voltammetry
  • Electron shuttles
  • Jarosite
  • Reductive dissolution

Fingerprint Dive into the research topics of 'Electron shuttles stimulate the reductive dissolution of jarosite by Acidiphilium cryptum'. Together they form a unique fingerprint.

Cite this