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首页> 外文期刊>Environmental Science & Technology >Bacillus subtilis Bacteria Hinder the Oxidation and Hydrolysis of Fe~(2+) Ions
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Bacillus subtilis Bacteria Hinder the Oxidation and Hydrolysis of Fe~(2+) Ions

机译：枯草芽孢杆菌细菌阻碍Fe〜（2+）离子的氧化和水解

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摘要

Bacteria are known to associate closely with secondary iron oxides in natural environments, but it is still unclear whether they catalyze their precipitation. Here, Fe~(2+) 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 Fe~(2+) ions were hindered.
机译：已知细菌在自然环境中会与次级氧化铁紧密结合，但仍不清楚它们是否催化其沉淀。在此，在永久性的有氧条件下，将Fe〜（2+）离子逐步添加到各种浓度的枯草芽孢杆菌细菌中，同时通过以监控的速率添加NaOH溶液将pH保持在6.5。通过湿化学，SEM和XRD对铁/细菌沉淀物进行表征。非生物合成产生纳米纤铁矿，其动力学表现出很强的自催化作用。生物合成导致在中等细菌浓度下形成微小且结晶不良的颗粒，并在高细菌浓度下完全抑制颗粒形成。自催化作用的发生被延迟并且其强度降低。 Fe〜（2+）离子的氧化和水解均受到阻碍。

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