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Dr. Rasha Mohamed Mostafa El-Meihy :: Publications:

Title:
Fast removal of toxic hexavalent chromium from an aqueous solution by high-density Geobacter sulfurreducens
Authors: Rasha Elmeihy, Xiao-Chen Shi, Pier-Luc Tremblay, Tian Zhang
Year: 2020
Keywords: Toxic Cr(VI), Cr(III);Geobacter sulfurreducens; High-density cell population Extracellular reduction
Journal: Chemosphere
Volume: 263
Issue: Not Available
Pages: Not Available
Publisher: Elsevier
Local/International: International
Paper Link:
Full paper Not Available
Supplementary materials Not Available
Abstract:

Hexavalent chromium (Cr(VI)) is a carcinogenic compound that can be removed from contaminated sites by the activity of metal-educing bacteria. The model bacterium Geobacter sulfurreducens reduces Cr(VI) to less toxic Cr(III) and accumulates Cr ions intracellularly. However, this process is usually slow with small concentrations of Cr(VI) removed in a matter of days. Here, high-density G. sulfurreducens cultures were tested for the capacity to remove Cr(VI) readily. With an initial G. sulfurreducens density of 5.8  108 cells ml1, 99.0 ± 0.8% of 100 mg l1 Cr(VI) was removed after 20 min. With a higher starting Cr(VI) concentration of 200 mg l1, G. sulfurreducens with a density of 11.4  108 cells ml1 removed 99.0 ± 0.4% Cr(VI) after 2 h. Experiments performed with cell-free spent medium indicate that extracellular proteins are major contributors for the reduction of Cr(VI) to Cr(III). Furthermore, results show that most Cr(III) ions ultimately end up inside the bacterial cells where they are less susceptible to reoxidation. The fast Cr(VI) removal rates observed with high-density G. sulfurreducens demonstrate the potential of this bacterium for bioremediation applications such as the cleaning of industrial wastewaters.

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