Research on Extracellular Electron Transfer of Acidithiobacillus Ferrooxidans†

doi:10.7503/cjcu20130578

Abstract

Abstract:

Extracellular electron transfer of Acidithiobacillus ferrooxidans(At. f) was investigated using cyclic voltammetry and chronoamperometry. Compared with cyclic voltammograms with ferrous ion or sulfur as electron donors, At. f has the extracellular electron transfer capability, and the reduction peak is produced by At. f under the condition of a constant potential -0.4 V, adding ferrous ion to the system could improve extracellular electron transfer. The current produced/changed under aerobic condition is more than one order of magnitude than under anaerobic condition. It illustrates that At. f has the stronger electrochemical activity under aerobic condition. In addition, surface characteristics of At. f were analyzed using X-ray diffraction, Fourier transform infrared spectra and scanning electron microscopy. These results could provide a basis for improving metal leaching rate.

Key words: Acidithiobacillus ferrooxidan, Electron transfer, Bioleaching, Cyclic voltammetry, Chronoam-perometry

CLC Number:

O646

TrendMD:

LIANG Fangyuan, WU Ranran, CAO Changli, ZHENG Yue, YANG Zhaohui, ZHAO Feng. Research on Extracellular Electron Transfer of Acidithiobacillus Ferrooxidans^†[J]. Chem. J. Chinese Universities, 2014, 35(2): 372.

Figures/Tables 6

Fig.1 Cyclic voltammograms under the condition of nitrogen(A) and oxygen(B)^a. Control test; b. At.f system; c. At. f after UV irradiation for 30 min.

Fig.2 X-Ray diffraction pattern(A) and Fourier transform infrared spectrum(B)

Fig.3 Cyclic voltammograms under the condition of nitrogen with sulfur as electron donor^a. Control test; b. At. f system; c. At. f after UV irradiation for 30 min.

Fig.4 Current-time plots at a constant potential of -0.4 V(vs. Ag/AgCl) under air condition^(A) Control test; (B) At. f system.

Fig.5 Current-time plots held at a constant potential of-0.4 V(vs. Ag/AgCl)^a. At. f system; b. control test.

Fig.6 Scanning electron microscopy images of working electrodes^(A) Control test; (B) At. f system.

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