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Impact and application of electron shuttles on the redox (bio)transformation of contaminants: A review

Paper ID Volume ID Publish Year Pages File Format Full-Text
14785 1250 2009 22 PDF Available
Title
Impact and application of electron shuttles on the redox (bio)transformation of contaminants: A review
Abstract

During the last two decades, extensive research has explored the catalytic effects of different organic molecules with redox mediating properties on the anaerobic (bio)transformation of a wide variety of organic and inorganic compounds. The accumulated evidence points at a major role of electron shuttles in the redox conversion of several distinct contaminants, both by chemical and biological mechanisms. Many microorganisms are capable of reducing redox mediators linked to the anaerobic oxidation of organic and inorganic substrates. Electron shuttles can also be chemically reduced by electron donors commonly found in anaerobic environments (e.g. sulfide and ferrous iron). Reduced electron shuttles can transfer electrons to several distinct electron-withdrawing compounds, such as azo dyes, polyhalogenated compounds, nitroaromatics and oxidized metalloids, among others. Moreover, reduced molecules with redox properties can support the microbial reduction of electron acceptors, such as nitrate, arsenate and perchlorate. The aim of this review paper is to summarize the results of reductive (bio)transformation processes catalyzed by electron shuttles and to indicate which aspects should be further investigated to enhance the applicability of redox mediators on the (bio)transformation of contaminants.

Keywords
Degradation; Electron shuttle; Pollutants; Remediation; Redox mediator; Wastewater treatment
First Page Preview
Impact and application of electron shuttles on the redox (bio)transformation of contaminants: A review
Publisher
Database: Elsevier - ScienceDirect
Journal: Biotechnology Advances - Volume 27, Issue 3, May–June 2009, Pages 256–277
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering