Electrotrophic perchlorate reduction by a psychrotolerant acidophile isolated from an acid rock drainage in Antarctica

Felipe Torres-Rojas, Pedro Hernández, Ignacio T. Vargas, Ivan Nancucheo*

*Autor correspondiente de este trabajo

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

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Resumen

A new extremophilic isolate (USS-CCA7) was obtained from an acidic environment (pH ∼ 3.2) in Antarctica phylogenetically related to Acidithiobacillus ferrivorans; its electrotrophic capacities were evaluated in a three-electrode electrochemical cell. Cyclic voltammetry showed cathodic peaks of −428 mV, −536 mV, and −634 mV (vs. Ag/AgCl; pH = 1.7; 3 M KCl) for nitrate, oxygen, and perchlorate, respectively. The catalytic role of this microorganism was also observed by a decrease in the charge transfer resistance registered via electrochemical impedance spectroscopy. Five-day chronoamperometry of culture at pH = 1.7, USS-CCA7 showed a perchlorate removal rate of 19.106 ± 1.689 mgL−1 day−1 and a cathodic efficiency of 112 ± 5.2 %. Growth on electrodes was observed by epifluorescence and scanning electron microscopy. Interestingly, the results showed that toward higher pH, the cathodic peak of perchlorate is reduced in the voltammetric profiles. This study highlights the use of this psychrotolerant acidophile for the bioremediation of harsh perchlorate-pressured terrestrial under acidic conditions.

Idioma originalInglés
Número de artículo108458
PublicaciónBioelectrochemistry
Volumen152
DOI
EstadoPublicada - 2023

Nota bibliográfica

Publisher Copyright:
© 2023 Elsevier B.V.

Áreas temáticas de ASJC Scopus

  • Biofísica
  • Química física y teórica
  • Electroquímica

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