Effect of Shewanella oneidensis on the Kinetics of Fe(II)-Catalyzed Transformation of Ferrihydrite to Crystalline Iron Oxides,Environmental Science & Technology

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Effect of Shewanella oneidensis on the Kinetics of Fe(II)-Catalyzed Transformation of Ferrihydrite to Crystalline Iron Oxides
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2017-12-20 00:00:00 , DOI: 10.1021/acs.est.7b05098
Wei Xiao ₁ , Adele M. Jones ₁ , Xiaomin Li ₁ , Richard N. Collins ₁ , T. David Waite ₁

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Iron (oxyhydr)oxides are widespread in natural and engineered systems, potent adsorbents of contaminants and a source of energy for iron-reducing bacteria. Microbial reduction of iron (oxyhydr)oxides results in the formation of Fe(II) which can induce the transformation of these iron minerals, typically from less crystalline to more crystalline forms, affecting the biogeochemical cycling of iron and the behavior of any species adsorbed to the iron (oxyhydr)oxides. Factors influencing the transformation rate of the poorly crystalline iron (oxyhydr)oxide, ferrihydrite, to more crystalline forms in the presence of the iron reducing bacterium Shewanella oneidensis MR-1 are investigated under controlled laboratory conditions in this work. In particular, the amount of Fe(II) produced increased the transformation rate while increasing concentrations of the electron donor, lactate, decreased the rate. Using kinetic parameters determined from abiotic controls, the results of transformation experiments in the presence of Shewanella oneidensis were modeled with this exercise revealing that less goethite and more lepidocrocite formed than expected. Conversely, studies using the Shewanella exudate only, containing biogenic Fe(II), displayed rates of transformation that were satisfactorily modeled using these abiotic control kinetic parameters. This result suggests that the physical presence of the microbes is pivotal to the reduction in ferrihydrite transformation rate observed in the biotic experiments relative to the analogous abiotic controls.

中文翻译：

的效果希瓦氏菌oneidensis中对Fe的动力学（II）水铁矿催化的转化到结晶氧化铁

氧化铁（羟基氧化物）广泛存在于自然和工程系统中，污染物的有效吸附剂和还原铁细菌的能源。微生物还原铁（羟基氧化物）导致形成Fe（II），Fe（II）可以诱导这些铁矿物质的转化，通常从较少的结晶形式转变为更多的结晶形式，从而影响铁的生物地球化学循环以及吸附到其中的任何物质的行为。铁（羟基氧化物）。在还原铁细菌希瓦氏菌存在下影响弱结晶铁（羟基氧化物），水铁矿向更多晶体形式转化速率的因素在这项工作中，在受控实验室条件下对MR-1进行了研究。特别地，产生的Fe（II）的量增加了转化率，而电子给体乳酸盐的浓度增加则降低了转化率。使用从非生物对照中确定的动力学参数，在此实验中模拟了在Shewanella oneidensis存在下的转化实验结果，发现比预期的更少的针铁矿和更多的纤铁矿形成。相反，使用希瓦氏菌的研究仅渗出液中含有生物Fe（II），显示出的转化率已使用这些非生物控制动力学参数令人满意地建模。该结果表明，相对于类似的非生物对照，微生物的物理存在对于在生物实验中观察到的亚铁水合物转化率的降低至关重要。

更新日期：2017-12-20

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