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Bacillus subtilis bacteria hinder the oxidation and hydrolysis of Fe2+ ions

Abstract : Bacteria are known to associate closely with secondary iron oxides in natural environments, but it is still unclear whether they catalyze their precipitation. Here, Fe2+ ions were progressively added to various concentrations of Bacillus subtilis bacteria in permanently oxic conditions while maintaining the pH at 6.5 by adding a NaOH solution at a monitored rate. The iron/bacteria precipitates were characterized by wet chemistry, SEM, and XRD. Abiotic syntheses produced nanolepidocrocite, and their kinetics displayed a strong autocatalytic effect. Biotic syntheses led to the formation of tiny and poorly crystallized particles at intermediate bacterial concentrations and to a complete inhibition of particle formation at high bacterial concentrations. The occurrence of the autocatalytic effect was delayed and its intensity was reduced. Both the oxidation and the hydrolysis of Fe2+ ions were hindered.
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Submitted on : Friday, May 23, 2008 - 2:37:22 PM
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Mohamad Fakih, Xavier Chatellier, Mélanie Davranche, Aline Dia. Bacillus subtilis bacteria hinder the oxidation and hydrolysis of Fe2+ ions. Environmental Science and Technology, American Chemical Society, 2008, 42 (9), pp.3194-3200. ⟨10.1021/es702512n⟩. ⟨insu-00281607⟩



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