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Article Dans Une Revue Environmental Science and Technology Année : 2008

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

Mélanie Davranche
Aline Dia

Résumé

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.

Dates et versions

insu-00281607 , version 1 (23-05-2008)

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Citer

Mohamad Fakih, Xavier Chatellier, Mélanie Davranche, Aline Dia. Bacillus subtilis bacteria hinder the oxidation and hydrolysis of Fe2+ ions. Environmental Science and Technology, 2008, 42 (9), pp.3194-3200. ⟨10.1021/es702512n⟩. ⟨insu-00281607⟩
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