Insight into the magnetic properties of Pb-dopped iron oxide nanoparticles during Fe(III) bio-reduction by Shewanella oneidensis MR-1
نویسندگان
چکیده
Anthropogenic activities have led to a significant accumulation of Pb in the environment, posing threat ecosystems. Iron oxides that display magnetic properties are ubiquitous environment and partitioning onto these minerals is considered one most critical geochemical processes controlling its environmental fate. In anoxic environments, iron undergo redox cycling due biotic abiotic routes, resulting their transformation/dissolution evolution characteristics. However, there still lack knowledge on impact dynamic bioreduction. Furthermore, little information available regarding nature biogenic signatures. Here we incubated Pb-bearing ferrihydrites (Fh_Pb) with various Pb/(Fe + Pb) molar ratios (i.e., 0, 2 5%) iron-reducing bacterium Shewanella oneidensis MR-1, for 21 days. XRD analyses initial Fh_Pb displayed characteristic features Fh decrease magnetization presence Pb. During bio-reduction process, doping drop rate extent reduction. At end incubation period, analysis aqueous solutions revealed minor proportion solution, indicating sorbed minerals. Magnetite (95%) siderite (5%) formed during bioreduction Fh, while magnetite (~80%) goethite (~20%) precipitated as by transmission Mössbauer spectroscopy. size particles decreased from about 11 nm absence 6 2% Pb-bearing, 5% too small be quantified our TEM measurements. The combined effect particle magnetite, substitution precipitation Pb-dopped assay at room temperature. Overall, this study highlights transformation sensitivity magnetism serve monitoring method.
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ژورنال
عنوان ژورنال: Chemical Geology
سال: 2022
ISSN: ['0009-2541', '1872-6836']
DOI: https://doi.org/10.1016/j.chemgeo.2022.120904