In Situ Redox Flexibility of FeII-III Oxyhydroxycarbonate Green Rust and Fougerite
作者： Christian Ruby , Chandan Upadhyay , Antoine Géhin , Georges Ona-Nguema , Jean-Marie R. GÉnin
DOI: 10.1021/ES0606834
关键词:
摘要: Bacterial activity is commonly thought to be directly responsible for denitrification in soils and groundwater. However, nitrate reduction low organic sediments occurs abiotically by FeII ions within the fougerite mineral (IMA 2003-057), giving bluish-green color of gleysols. Fougerite, counterpart FeII-III oxyhydroxycarbonate, FeII6(1-x)FeIII6xO12H2(7-3x)CO3, provides a unique situ redox flexibility, which can adapt x = {[FeIII]/[Fetotal]} between 1/3 2/3 as shown using Mossbauer spectroscopy. Chemical potential Eh−pH diagrams this system were determined from electrode monitored during deprotonation hydroxycarbonate FeII4FeIII2(OH)12CO3 assess possibility reducing pollutants field. Bioreduction ferric oxyhydroxides anoxic groundwater yields dissolved FeII, whereas HCO3- anions produced matter are incorporated into layered double oxyhydroxide structure. Thus, solid-state mediator acting a...
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