☆ 4.7 Article

Efficient reduction of Cr(VI) and immobilization of Cr driven by an iron-air fuel cell: Reaction mechanisms and electricity generation

CHEMOSPHERE (2020)

Journal

CHEMOSPHERE

Volume 253, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD

DOI: 10.1016/j.chemosphere.2020.126730

Keywords

Iron-air fuel cell; Cr(VI) reduction; Precipitation; Power generation

Categories

Environmental Sciences

Funding

National Major Science and Technology Program for Water Pollution Control and Treatment [2017ZX07101-006]
National Natural Science Foundation of China [41775119]
Natural Science Foundation of Shandong Province [ZR2019MEE015]
Focus on Research and Development Plan in Shandong Province [2019GSF109046]

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Abstract

The iron-air fuel cell (IAFC) has been successfully employed for the oxidative removal of many pollutants, but its feasibility for reductive immobilization of Cr(VI) is still unknown. Herein, we developed an IAFC system consisting of an iron anode and an activated carbon-PTFE based air-cathode, and evaluated its performance for Cr(VI) removal and power generation. In this reaction system, cathodic reduction and Fe(II) reduction both contributed to the reductive removal of Cr(VI). It was found that the decrease of solution pH from 6.0 to 3.0 promoted the removal of Cr(VI) due to the enhanced yield of Fe(II) ions and cathodic reduction, accompanying the increased power generation from 1040 mW m(-2) to 2880 mW m(-2). Besides, the Cr(VI) removal and power generation could be also promoted by elevating Na2SO4 concentration from 0.01 M to 0.1 M. In the IAFC process, Cr(VI) was initially reduced to less soluble ionic Cr(III) homogeneously and heterogeneously and then Cr(III) was immobilized by adsorption and/or co-precipitation with the fresh Fe(III) (oxy)hydroxides. Generally, this study is of great interest for the engineering community to design the environmentally benign and cost-effective strategy for the treatment of wastewater in remote areas, where the electricity is not easily available. (C) 2020 Elsevier Ltd. All rights reserved.

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