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Formation of soluble Cr(III) end-products and nanoparticles during Cr(VI) reduction by Bacillus cereus strain XMCr-6

Paper ID Volume ID Publish Year Pages File Format Full-Text
3456 171 2013 7 PDF Available
Title
Formation of soluble Cr(III) end-products and nanoparticles during Cr(VI) reduction by Bacillus cereus strain XMCr-6
Abstract

The Bacillus cereus strain XMCr-6 was isolated from chromium-contaminated soils and was identified on the basis of biochemical characteristics and 16S rRNA gene sequence analysis. The bacterium exhibited complete reduction of 100 mg L−1 Cr(VI) within 48 h under aerobic conditions. The reduction of Cr(VI) by XMCr-6 was attributed to cell debris rather than cell free extract, and the reduction mechanism was found to be enzyme-mediated. It was demonstrated that the reduced Cr(III) could bind to cells by coordination with functional groups on the bacterial surfaces while it simultaneously formed soluble Cr(III) end-products through interactions with small organic molecules. Discrete spherical Cr2O3 nanoparticles were observed on the surface of the bacterial cells after Cr(VI) reduction by XMCr-6 in the absence of an appropriate chelating chemical. Our results offer insight into bacterial Cr(VI) reduction processes and will be valuable for understanding reduction mechanisms and Cr(VI) bioremediation.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The strain XMCr-6 could reduce sufficient Cr(VI) completely within 48 h. ► The Cr(VI) reduction mechanism by XMCr-6 was enzyme-mediated in the cell debris. ► Small organic molecules compete with bacteria for reduced Cr (III) coordination. ► Role of small organic molecules in determining the types of Cr(III) end-products. ► Reduced Cr(III) could form discrete spherical Cr2O3 nanoparticles.

Keywords
Chromate; Nanoparticles; Bioremediation; Environmental preservation; Waste treatment; Bioconversion
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Formation of soluble Cr(III) end-products and nanoparticles during Cr(VI) reduction by Bacillus cereus strain XMCr-6
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 70, 15 January 2013, Pages 166–172
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us