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Efficient W and Mo deposition and separation with simultaneous hydrogen production in stacked bioelectrochemical systems

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posted on 18.08.2017 by Liping Huang, Ming Li, Yuzhen Pan, Yong Shi, Xie Quan, Gianluca Li-Puma
© 2017 Elsevier B.V. Efficient deposition and separation of W(VI) and Mo(VI) with simultaneous hydrogen production, without external energy input, is achieved in stacked bioelectrochemical systems (BESs) composed of microbial fuel cells (MFCs) and microbial electrolysis cells (MECs). The stacked BES-3-1 made of one MEC unit (1#) serially connected with three parallel connected MFC units (2#) outperformed other modules, achieving depositions of 27.6 ± 1.2% (W) and 75.4 ± 2.1% (Mo) with a separation factor of 8.1 ± 0.2 and hydrogen production of 0.34 ± 0.01 m 3 /m 3  d in the 1# unit, compared to 12.3 ± 0.9% (W), 52.6  ± 2.2% (Mo) and 7.9 ± 0.5 (separation factor) in the 2# unit. The control experiments with W(VI) only deposited 6.8 ± 1.3% in 1# and 3.3 ± 0.4% in 2#, compared to 65.1 ± 3.2% in 1# and 45.2 ± 0.9% in 2# with Mo(VI) only. The control experiments with either the 1# or 2# unit and a mixture of W(VI) and Mo(VI) deposited 15.3 ± 1.7% (W) and 60.1 ± 1.6% (Mo) (1# only), and 12.9 ± 1.3% (W) and 56.1 ± 2.0% (Mo) (2# only). Reuse of the catholyte after acidification achieved complete separation of W and Mo from one another. This study demonstrates the feasibility of stacked BESs for W and Mo deposition and separation with simultaneous hydrogen production. The dual benefits of W(VI) and Mo(VI) species, and the favorable impact of the 2# unit on the 1# unit in the stacked BES module were critical to achieve efficient performance.

Funding

The authors gratefully acknowledge financial support from the National Natural Science Foundation of China (No. 51578104), and the Programme of Introducing Talents of Discipline to University (B13012).

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

Chemical Engineering Journal

Volume

327

Pages

584 - 596

Citation

HUANG, L. ...et al., 2017. Efficient W and Mo deposition and separation with simultaneous hydrogen production in stacked bioelectrochemical systems. Chemical Engineering Journal, 327, pp. 584-596.

Publisher

© Elsevier

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2017

Notes

This paper was accepted for publication in the journal Chemical Engineering Journal and the definitive published version is available at http://dx.doi.org/10.1016/j.cej.2017.06.149

ISSN

1385-8947

Language

en

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