TY - JOUR
T1 - Bioremediation of highly toxic arsenic via carbon-fiber-assisted indirect As(III) oxidation by moderately-thermophilic, acidophilic Fe-oxidizing bacteria
AU - Okibe, Naoko
AU - Fukano, Yuken
N1 - Funding Information:
This work was supported by JX Nippon Mining & Metals. The XAFS experiments were performed at the SAGA Light Source (Kyushu University Beam Line; BL06, No. 2014IIK025). Acidiplasma sp. Fv-Ap was kindly provided by Prof. D. B. Johnson (Bangor University, UK). Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Funding Information:
This work was supported by JX Nippon Mining & Metals. The XAFS experiments were performed at the SAGA Light Source (Kyushu University Beam Line; BL06, No. 2014IIK025). Acidiplasma sp. Fv-Ap was kindly provided by Prof. D. B. Johnson (Bangor University, UK).
Publisher Copyright:
© 2019, Springer Nature B.V.
PY - 2019/12/1
Y1 - 2019/12/1
N2 - Objective: To enable removal of highly toxic As(III) from acidic waters by inducing indirect microbial As(III) oxidation by Fe-oxidizing bacteria via carbon-assisted redox-coupling between As(III) oxidation and Fe3+ reduction. Results: Carbon-fiber (CF) was shown to function as an electron-mediator to catalyze chemical (abiotic) redox-coupling between As(III) oxidation and Fe3+ reduction. Accordingly, by taking advantage of Fe3+ regeneration by Fe-oxidizing bacteria, it was possible to promote oxidative removal of As(III) as ferric arsenate at moderate temperature. This reaction can be of use under the situation where a high-temperature treatment is not immediately available. Arsenic once concentrated as ferric arsenate on carbon-fibers can be collected to undergo phase-transformation to crystalline scorodite as the next re-solubilization/re-crystallization step at a higher temperature (70 °C). Conclusions: While extremely acidophilic Fe-oxidizing bacteria are widely found in nature, the As-oxidizing counterparts, especially those grown on moderately-thermophilic and mesophilic temperatures, are hardly known. In this regard, the finding of this study could make a possible introduction of the semi-passive, low-temperature As-treatment using readily available Fe-oxidizing bacteria.
AB - Objective: To enable removal of highly toxic As(III) from acidic waters by inducing indirect microbial As(III) oxidation by Fe-oxidizing bacteria via carbon-assisted redox-coupling between As(III) oxidation and Fe3+ reduction. Results: Carbon-fiber (CF) was shown to function as an electron-mediator to catalyze chemical (abiotic) redox-coupling between As(III) oxidation and Fe3+ reduction. Accordingly, by taking advantage of Fe3+ regeneration by Fe-oxidizing bacteria, it was possible to promote oxidative removal of As(III) as ferric arsenate at moderate temperature. This reaction can be of use under the situation where a high-temperature treatment is not immediately available. Arsenic once concentrated as ferric arsenate on carbon-fibers can be collected to undergo phase-transformation to crystalline scorodite as the next re-solubilization/re-crystallization step at a higher temperature (70 °C). Conclusions: While extremely acidophilic Fe-oxidizing bacteria are widely found in nature, the As-oxidizing counterparts, especially those grown on moderately-thermophilic and mesophilic temperatures, are hardly known. In this regard, the finding of this study could make a possible introduction of the semi-passive, low-temperature As-treatment using readily available Fe-oxidizing bacteria.
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U2 - 10.1007/s10529-019-02746-7
DO - 10.1007/s10529-019-02746-7
M3 - Article
C2 - 31655925
AN - SCOPUS:85074328794
SN - 0141-5492
VL - 41
SP - 1403
EP - 1413
JO - Biotechnology Letters
JF - Biotechnology Letters
IS - 12
ER -