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Dielectric constants of organic pollutants determine their strength for enhancing microbial iron reduction
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Dielectric constants of organic pollutants determine their strength for enhancing microbial iron reduction
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Journal Article
Dielectric constants of organic pollutants determine their strength for enhancing microbial iron reduction
2021
Overview
Physicochemical properties are essential characteristics of organic compounds, which not only impact the fate of organic pollutants but also determine their application in biological processes. Here, we first found that the dielectric constants (
ɛ
) of organic pollutants negatively correlated to their strength for enhancing microbial Fe(III) reduction. Those with lower
ɛ
values than 2.61 potentially promoted the above process following the sequence carbon tetrachloride (CT) > benzene > toluene > tetrachloroethylene (PCE) due to their different ability to deprotonate the phosphorus-related groups on the outer cell membrane of iron-reducing bacteria
Shewanella oneidensis
MR-1 (MR-1). The stronger deprotonation of phosphorus-related groups induced more negative charge of cell surface and more strongly increased cell membrane permeability and consequently stimulated faster release of flavin mononucleotide (FMN) as an electron shuttle/cofactor for Fe(III) reduction. These findings are significant for understanding the biogeochemistry in multi-organic contaminated subsurface and providing knowledge for remediation strategies and current production.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
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