Reoxidation of Biogenic Reduced Uranium: A Challenge Toward Bioremediation

Singh, Gursharan; Şengör, S. Sevinç; Bhalla, Aditya; Kumar, Sudhir; J, De; Stewart, Brandy D.; Spycher, Nicolas; Ginn, Timothy M.; Peyton, Brent M.; Sani, Rajesh K.

doi:10.1080/10643389.2012.728522

Cited by 34 publications

(21 citation statements)

References 84 publications

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“…Error bars indicate the standard deviation association of biogenic U(IV) with proteins and EPS, associated with the biomass, makes its unlikely to be transported as colloidal phases (Bargar et al 2008). However, after U bioreduction, Fe(III)hydroxide minerals as well as Fe sulfide minerals, reduced organic matter, electron shuttles could be controlling factors for the transport and long-term stability of bioreduced U (Singh et al 2014). Wang et al (2013) report mobile U(IV)-bearing colloids in a mining-impacted wetland demonstrating the presence of U(IV) in soil as a noncrystalline species bound to amorphous Al-P-Fe-Si aggregates, whereas in porewater, as a distinct species associated with Fe and organic matter colloids.…”

Section: Resultsmentioning

confidence: 99%

“…At least three different types of biogenic U(IV) have been observed: crystalline uraninite, nanoparticulate uraninite, and mononuclear U(IV) (Maleke et al 2015;Zhou et al 2014a, b;Singh etal.2014;Boyanov et al 2011;Fletcher et al 2010;Bernier-Latmani et al 2010). These reduced forms of U are prone to re-oxidation, raising questions regarding long-term U remediation and site stewardship (Singh et al 2014;Spycher et al 2011;Moonetal.2009;Beyenal et al 2004). Following the microbial reduction of U(VI) to U(IV), the second step in biogenic U(IV) formation entails the aggregation of the precipitated mineral.…”

Section: Introductionmentioning

confidence: 99%

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Impact of different environmental conditions on the aggregation of biogenic U(IV) nanoparticles synthesized by Desulfovibrio alaskensis G20

et al. 2016

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This study investigates the impact of specific environmental conditions on the formation of colloidal U(IV) nanoparticles by the sulfate reducing bacteria (SRB, Desulfovibrio alaskensis G20). The reduction of soluble U(VI) to less soluble U(IV) was quantitatively investigated under growth and non-growth conditions in bicarbonate or 1,4-piperazinediethanesulfonic acid (PIPES) buffered environments. The results showed that under non-growth conditions, the majority of the reduced U nanoparticles aggregated and precipitated out of solution. High resolution transmission electron microscopy revealed that only a very small fraction of cells had reduced U precipitates in the periplasmic spaces in the presence of PIPES buffer, whereas in the presence of bicarbonate buffer, reduced U was also observed in the cytoplasm with greater aggregation of biogenic U(IV) particles at higher initial U(VI) concentrations. The same experiments were repeated under growth conditions using two different electron donors (lactate and pyruvate) and three electron acceptors (sulfate, fumarate, and thiosulfate). In contrast to the results of the non-growth experiments, even after 0.2 μm filtration, the majority of biogenic U(IV) remained in the aqueous phase resulting in potentially mobile biogenic U(IV) nanoparticles. Size fractionation results showed that U(IV) aggregates were between 18 and 200 nm in diameter, and thus could be very mobile. The findings of this study are helpful to assess the size and potential mobility of reduced U nanoparticles under different environmental conditions, and would provide insights on their potential impact affecting U(VI) bioremediation efforts at subsurface contaminated sites.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of different environmental conditions on the aggregation of biogenic U(IV) nanoparticles synthesized by Desulfovibrio alaskensis G20

et al. 2016

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“…Heavy metal and radioactive cations, of course, cannot be decomposed but have their solubility lowered or reduced, e.g. by a change in oxidation state and (Singh et al, 2013), so that they become less harmfully in the ground, or might be removed by phytoremediation or myco-remediation, which involves harvesting the fungus.…”

Section: Bioremediation Using Mushroommentioning

confidence: 99%

Mushrooms in the Bio-Remediation of Wastes from Soil

2019

ALST

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Mushrooms have played a great role in the field of bioremediation. Mushrooms are saprophyte highly specialized group of macro-fungi with a distinctive fruiting body, and have a unique capacity for degradation of certain types of organic pollutants like lignocellulotic wastes and bio-sorption of heavy metals. The degradation of ligenocellulotic wastes are initiated by the release of extracellular enzymes to the environment. The lignocellulaytic enzyme starts to degrade and breakdown the complex lignocellulotic wastes in to smaller and readily available molecules for their utilization. The present reviewed paper describes briefly the concerns regarding the extracellular mushroom enzymes, with having many potential applications in bioremediation of agricultural wastes, heavy metals and toxic organic compounds. Therefore, research is needed to develop understanding of integrated mushroom cultivation that optimizes mushroom utilization in the field of environmental remediation, while supporting other ecosystem services.

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“…Heavy metal and radioactive cations, of course, cannot be decomposed but can be rendered into forms of low solubility, e.g. by a change in oxidation state, such as U (IV) (in UO 2 ) (Singh et al, 2014), so that they remain less harmfully in the ground, or might be physically removed by phytoremediation or mycoremediation, which involves harvesting the plant or fungus.…”

Section: The Issue Of Contaminated Landmentioning

confidence: 99%

Mycoremediation (bioremediation with fungi) – growing mushrooms to clean the earth

Rhodes¹

2014

Chemical Speciation & Bioavailability

119

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Some of the prospects of using fungi, principally white-rot fungi, for cleaning contaminated land are surveyed. That whiterot fungi are so effective in degrading a wide range of organic molecules is due to their release of extra-cellular ligninmodifying enzymes, with a low substrate-specificity, so they can act upon various molecules that are broadly similar to lignin. The enzymes present in the system employed for degrading lignin include lignin-peroxidase (LiP), manganese peroxidase (MnP), various H 2 O 2 producing enzymes and laccase. The degradation can be augmented by adding carbon sources such as sawdust, straw and corn cob at polluted sites.

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Reoxidation of Biogenic Reduced Uranium: A Challenge Toward Bioremediation

Cited by 34 publications

References 84 publications

Impact of different environmental conditions on the aggregation of biogenic U(IV) nanoparticles synthesized by Desulfovibrio alaskensis G20

Impact of different environmental conditions on the aggregation of biogenic U(IV) nanoparticles synthesized by Desulfovibrio alaskensis G20

Mushrooms in the Bio-Remediation of Wastes from Soil

Mycoremediation (bioremediation with fungi) – growing mushrooms to clean the earth

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