TY - JOUR
T1 - Electron shuttles stimulate the reductive dissolution of jarosite by Acidiphilium cryptum
AU - GONZALEZ ROMO, ERNESTO ALEJANDRO
AU - Hernández, Loreto
AU - Muñoz, Jesús Ángel
AU - Blázquez, María Luisa
AU - Ballester, Antonio
AU - González, Felisa
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/6
Y1 - 2020/6
N2 - 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.
AB - 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.
KW - Acidiphilium cryptum
KW - Cyclic voltammetry
KW - Electron shuttles
KW - Jarosite
KW - Reductive dissolution
UR - http://www.scopus.com/inward/record.url?scp=85084333550&partnerID=8YFLogxK
U2 - 10.1016/j.hydromet.2020.105351
DO - 10.1016/j.hydromet.2020.105351
M3 - Article
AN - SCOPUS:85084333550
VL - 194
JO - Hydrometallurgy
JF - Hydrometallurgy
SN - 0304-386X
M1 - 105351
ER -