Bioreduction of hematite nanoparticles by the dissimilatory iron reducing bacterium Shewanella oneidensis MR-1

Bose, Saumyaditya; Hochella, Michael F.; Gorby, Yuri A.; Kennedy, David W.; McCready, David E.; Madden, Andrew S.; Lower, Brian H.

doi:10.1016/j.gca.2008.11.031

Cited by 209 publications

(103 citation statements)

References 81 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 2 shows that the differences in the surface-normalized reactivities within the various colloidal aggregate species are only minor and do not follow a size-dependent relationship. Even among monocrystalline nanoparticles of Ͻ100 nm, no clear size-reactivity relationship was discovered (5,47). Instead, in our experiments we observed a size dependency of the reduction rate when comparing colloidal, nanosized aggregates to bulk macroaggregates; the difference in the determined biotic reactivity might thus be credited to the suspended state and, therefore, the high spatial bioaccessibility of the colloidal iron oxide aggregate.…”

Section: Vol 76 2010 Nanosized Iron Oxide Colloids Enhance Iron Redcontrasting

confidence: 61%

Nanosized Iron Oxide Colloids Strongly Enhance Microbial Iron Reduction

Bosch

Heister

Hofmann

et al. 2010

Appl Environ Microbiol

View full text Add to dashboard Cite

Microbial iron reduction is considered to be a significant subsurface process. The rate-limiting bioavailability of the insoluble iron oxyhydroxides, however, is a topic for debate. Surface area and mineral structure are recognized as crucial parameters for microbial reduction rates of bulk, macroaggregate iron minerals. However, a significant fraction of iron oxide minerals in the subsurface is supposed to be present as nanosized colloids. We therefore studied the role of colloidal iron oxides in microbial iron reduction. In batch growth experiments with Geobacter sulfurreducens, colloids of ferrihydrite (hydrodynamic diameter, 336 nm), hematite (123 nm), goethite (157 nm), and akaganeite (64 nm) were added as electron acceptors. The colloidal iron oxides were reduced up to 2 orders of magnitude more rapidly (up to 1,255 pmol h ؊1 cell ؊1 ) than bulk macroaggregates of the same iron phases (6 to 70 pmol h ؊1 cell ؊1 ). The increased reactivity was not only due to the large surface areas of the colloidal aggregates but also was due to a higher reactivity per unit surface. We hypothesize that this can be attributed to the high bioavailability of the nanosized aggregates and their colloidal suspension. Furthermore, a strong enhancement of reduction rates of bulk ferrihydrite was observed when nanosized ferrihydrite aggregates were added.

show abstract

Section: Vol 76 2010 Nanosized Iron Oxide Colloids Enhance Iron Redcontrasting

confidence: 61%

Nanosized Iron Oxide Colloids Strongly Enhance Microbial Iron Reduction

Bosch

Heister

Hofmann

et al. 2010

Appl Environ Microbiol

View full text Add to dashboard Cite

show abstract

“…Examination of canga solids by scanning electron microscopy (SEM) revealed smaller Fe(III)-rich particles than the other solids ( Figure 3A-E), which would also enhance Fe(III) bioreduction [23,25,41]. Iron ore contained large particles (many ≥ 10 μm) that were not observed in other solid phases ( Figure 3A-E), while particles in BIF were of similar sizes and morphologies to those in canga ( Figure 3A,B).…”

Section: Controls On Fe(iii) Bioreductionmentioning

confidence: 99%

“…Reference diffraction patterns of goethite, quartz, and hematite are shown for comparison and were generated using data from The American Mineralogist Crystal Structure Database [22]. [23][24][25], we chose a relatively simple first order rate formulation for the purpose of comparing rates of Fe(III) bioreduction among a variety of Fe(III) phases. Initial rates of Fe(III) bioreduction exhibited a similar trend to the observed extents of Fe(III) reduction, with canga-and BIF-Fe(III) undergoing reduction at the greatest initial rates, while iron ore-and HEM spec -Fe(III) underwent bioreduction at the lowest initial rates.…”

Section: Figurementioning

confidence: 99%

Microbial Reducibility of Fe(III) Phases Associated with the Genesis of Iron Ore Caves in the Iron Quadrangle, Minas Gerais, Brazil

Parker

Wolf

Auler³

et al. 2013

Minerals

View full text Add to dashboard Cite

Abstract:The iron mining regions of Brazil contain thousands of "iron ore caves" (IOCs) that form within Fe(III)-rich deposits. The mechanisms by which these IOCs form remain unclear, but the reductive dissolution of Fe(III) (hydr)oxides by Fe(III) reducing bacteria (FeRB) could provide a microbiological mechanism for their formation. We evaluated the susceptibility of Fe(III) deposits associated with these caves to reduction by the FeRB Shewanella oneidensis MR-1 to test this hypothesis. Canga, an Fe(III)-rich duricrust, contained poorly crystalline Fe(III) phases that were more susceptible to reduction than the Fe(III) (predominantly hematite) associated with banded iron formation (BIF), iron ore, and mine spoil. In all cases, the addition of a humic acid analogue enhanced Fe(III) reduction, presumably by shuttling electrons from S. oneidensis to Fe(III) phases. The particle size and quartz-Si content of the solids appeared to exert control on the rate and extent of Fe(III) reduction by S. oneidensis, with more bioreduction of Fe(III) associated with solid phases containing more quartz. Our results provide evidence that IOCs may be formed by the activities of Fe(III) reducing bacteria (FeRB), and the rate of this formation is dependent on the physicochemical and mineralogical characteristics of the Fe(III) phases of the surrounding rock.

show abstract

“…doi:10.1016/j.gca.2010.09.008 Zachara, 1996;Fredrickson et al, 1998;Benner et al, 2002;Ona-Nguema et al, 2002;Zachara et al, 2002;Fredrickson et al, 2003;Glasauer et al, 2003;Hansel et al, 2003Hansel et al, , 2004Ona-Nguema et al, 2004;Behrends and Van Cappellen, 2007;Wilkins et al, 2007;Bose et al, 2009). However, pure Fe(III) (hydr)oxides are rarely found in natural soils and sediments and instead commonly contain several mol% substituted ions (Cornell and Schwertmann, 2003).…”

Section: +mentioning

confidence: 99%

Contrasting effects of Al substitution on microbial reduction of Fe(III) (hydr)oxides

Ekstrom

Learman

Madden

et al. 2010

Geochimica et Cosmochimica Acta

Self Cite

View full text Add to dashboard Cite

Aluminum, one of the most abundant elements in soils and sediments, is commonly found co-precipitated with Fe in natural Fe(III) (hydr)oxides; yet, little is known about how Al substitution impacts bacterial Fe(III) reduction. Accordingly, we investigated the reduction of Al substituted (0-13 mol% Al) goethite, lepidocrocite, and ferrihydrite by the model dissimilatory Fe(III)-reducing bacterium (DIRB), Shewanella putrefaciens CN32. Here we reveal that the impact of Al on microbial reduction varies with Fe(III) (hydr)oxide type. No significant difference in Fe(III) reduction was observed for either goethite or lepidocrocite as a function of Al substitution. In contrast, Fe(III) reduction rates significantly decreased with increasing Al substitution of ferrihydrite, with reduction rates of 13% Al-ferrihydrite more than 50% lower than pure ferrihydrite. Although Al substitution changed the minerals' surface area, particle size, structural disorder, and abiotic dissolution rates, we did not observe a direct correlation between any of these physiochemical properties and the trends in bacterial Fe(III) reduction. Based on projected Al-dependent Fe(III) reduction rates, reduction rates of ferrihydrite fall below those of lepidocrocite and goethite at substitution levels equal to or greater than 18 mol% Al. Given the prevalence of Al substitution in natural Fe(III) (hydr)oxides, our results bring into question the conventional assumptions about Fe (hydr)oxide bioavailability and suggest a more prominent role of natural lepidocrocite and goethite phases in impacting DIRB activity in soils and sediments.

show abstract

Bioreduction of hematite nanoparticles by the dissimilatory iron reducing bacterium Shewanella oneidensis MR-1

Cited by 209 publications

References 81 publications

Nanosized Iron Oxide Colloids Strongly Enhance Microbial Iron Reduction

Nanosized Iron Oxide Colloids Strongly Enhance Microbial Iron Reduction

Microbial Reducibility of Fe(III) Phases Associated with the Genesis of Iron Ore Caves in the Iron Quadrangle, Minas Gerais, Brazil

Contrasting effects of Al substitution on microbial reduction of Fe(III) (hydr)oxides

Contact Info

Product

Resources

About