Bio-reduction of ferrihydrite-montmorillonite-organic matter complexes: Effect of montmorillonite and fate of organic matter

Zeng, Qiang; Huang, Liuqin; Ma, Ji; Zhu, Zihua; He, Chen; Shi, Quan; Wen, Liu; Xi, Wang; Xia, Qingyin; Dong, Huijuan

doi:10.1016/j.gca.2020.03.011

Cited by 47 publications

(39 citation statements)

References 78 publications

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“…Geobacter sequences and/or organisms have been observed in different environments associated with the turnover of recalcitrant carbon and/or methanogenesis. For example, in recent studies, Geobacter were shown to be increased with biochar samples and increased methanogenesis [70], correlated to decreased polyphenolics/polycyclic aromatics in methanogenic rice paddy soils [71], and shown to catalyze the turnover of organic matter associated with Fe (hydr)oxides [72].…”

Section: Biological Process For Cbm Productionmentioning

confidence: 99%

Activity-based, genome-resolved metagenomics uncovers key populations and pathways involved in subsurface conversions of coal to methane

et al. 2021

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Microbial metabolisms and interactions that facilitate subsurface conversions of recalcitrant carbon to methane are poorly understood. We deployed an in situ enrichment device in a subsurface coal seam in the Powder River Basin (PRB), USA, and used BONCAT-FACS-Metagenomics to identify translationally active populations involved in methane generation from a variety of coal-derived aromatic hydrocarbons. From the active fraction, high-quality metagenome-assembled genomes (MAGs) were recovered for the acetoclastic methanogen, Methanothrix paradoxum, and a novel member of the Chlorobi with the potential to generate acetate via the Pta-Ack pathway. Members of the Bacteroides and Geobacter also encoded Pta-Ack and together, all four populations had the putative ability to degrade ethylbenzene, phenylphosphate, phenylethanol, toluene, xylene, and phenol. Metabolic reconstructions, gene analyses, and environmental parameters also indicated that redox fluctuations likely promote facultative energy metabolisms in the coal seam. The active Chlorobi MAG encoded enzymes for fermentation, nitrate reduction, and multiple oxygenases with varying binding affinities for oxygen. M. paradoxum PRB encoded an extradiol dioxygenase for aerobic phenylacetate degradation, which was also present in previously published Methanothrix genomes. These observations outline underlying processes for bio-methane from subbituminous coal by translationally active populations and demonstrate activity-based metagenomics as a powerful strategy in next generation physiology to understand ecologically relevant microbial populations.

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Section: Biological Process For Cbm Productionmentioning

confidence: 99%

Activity-based, genome-resolved metagenomics uncovers key populations and pathways involved in subsurface conversions of coal to methane

et al. 2021

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“…7B) considers the contribution of both Fe and O to the catalytic activity of Mt nanoparticles, and highlights that surface oxygen anions play a major role in controlling the catalytic activity of the iron nanoparticles. Previous research has also shown that electrons can be transferred from the support to Fe(III) on the Mt surface through O NL bonds, thereby regenerating surface Fe(II) (Adhikari et al ., 2017; Zeng et al ., 2020), which may contribute to the mitigation of surface deactivation and promote HO • production. Furthermore, since the single OO bond in H 2 O 2 is much weaker than the OO double bond in O 2 , back‐donation of localized electrons after the adsorption of H 2 O 2 on O NL seems to induce the catalytic dissociation of H 2 O 2 to generate HO • (Li et al ., 2017).…”

Section: Discussionmentioning

confidence: 99%

Intrinsic enzyme‐like activity of magnetite particles is enhanced by cultivation with Trichoderma guizhouense

Chi

Zhao

Chen

et al. 2020

Environmental Microbiology

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Summary Fungal–mineral interactions can produce large amounts of biogenic nano‐size (~ 1–100 nm) minerals, yet their influence on fungal physiology and growth remains largely unexplored. Using Trichoderma guizhouense NJAU4742 and magnetite (Mt) as a model fungus and mineral system, we have shown for the first time that biogenic Mt nanoparticles formed during fungal–mineral cultivation exhibit intrinsic peroxidase‐like activity. Specifically, the average peroxidase‐like activity of Mt nanoparticles after 72 h cultivation was ~ 2.4 times higher than that of the original Mt. Evidence from high resolution X‐ray photoelectron spectroscopy analyses indicated that the unique properties of magnetite nanoparticles largely stemmed from their high proportion of surface non‐lattice oxygen, through occupying surface oxygen‐vacant sites, rather than Fe redox chemistry, which challenges conventional Fenton reaction theories that assume iron to be the sole redox‐active centre. Nanoscale secondary ion mass spectrometry with a resolution down to 50 nm demonstrated that a thin (< 1 μm) oxygen‐film was present on the surface of fungal hyphae. Furthermore, synchrotron radiation‐based micro‐FTIR spectra revealed that surface oxygen groups corresponded mainly to organic OH, mineral OH and carbonyl groups. Together, these findings highlight an important, but unrecognized, catalytic activity of mineral nanoparticles produced by fungal–mineral interactions and contribute substantially to our understanding of mineral nanoparticles in natural ecosystems.

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“…S. putrefaciens CN-32 cell pellets were prepared by an existing procedure , and resuspended in an anaerobic medium (50 mM borate buffer plus 30 μM phosphate). , The cell suspension was bubbled with N 2 for 1 h to remove O 2; the bottle was crimp-sealed with rubber for the hematite bioreduction experiments.…”

Section: Methodsmentioning

confidence: 99%

“…During the adsorption process, OM molecules with a high oxidation state and high aromaticity preferentially form ligand-exchange complexes with hydroxyl functional groups on the hematite surface, and OM components with low molecular weight exhibit a strong facet-dependent selective fractionation . Although the importance of the Fe oxide reductive dissolution process to the fate of Fe-bound OM was well recognized, − the fate of Fe oxide-bound OM at the molecular scale remains unclear. , Specifically, characteristic variations of the OM during the reductive dissolution of Fe remain poorly characterized. Given that the Fe reductive dissolution process generally occurs on the surfaces of Fe oxides, differences in the exposed facets may have dramatic effects on the interfacial reactions between Fe oxides and OM , and thereby on the microbial extracellular electron transfer.…”

Section: Introductionmentioning

confidence: 99%

Fulvic Acid-Mediated Interfacial Reactions on Exposed Hematite Facets during Dissimilatory Iron Reduction

Hu¹,

Wu²,

Li³

et al. 2021

Langmuir

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Although the dual role of natural organic matter (NOM) as an electron shuttle and an electron donor for dissimilatory iron (Fe) reduction has been extensively investigated, the underlying interfacial interactions between various exposed facets and NOM are poorly understood. In this study, fulvic acid (FA), as typical NOM, was used and its effect on the dissimilatory reduction of hematite {001} and {100} by Shewanella putrefaciens CN-32 was investigated. FA accelerates the bioreduction rates of hematite {001} and {100}, where the rate of hematite {100} is lower than that of hematite {001}. Secondary Fe minerals were not observed, but the HR-TEM images reveal significant defects. The ATR-FTIR results demonstrate that facet-dependent binding mainly occurs via surface complexation between the surface iron atoms and carboxyl groups of NOM. The spectroscopic and mass spectrometry analyses suggest that organic compounds with large molecular weight, highly aromatic and unsaturated structures, and lower H/C ratios are easily adsorbed on Fe oxides or decomposed by bacteria in FAhematite {001} treatment after iron reduction. Due to the metabolic processes of cells, a significant number of compounds with higher H/C and medium O/C ratios appear. The Tafel curves show that hematite {100} possessed higher resistance (4.1−2.6 Ω) than hematite {001} (3.5−2.2 Ω) at FA concentrations ranging from 0 to 500 mg L −1 , indicating that hematite {100} is less conductive during the electron transfer from reduced FA or cells to Fe oxides than hematite {001}. Overall, the discrepancy in the iron bioreduction of two exposed facets is attributed to both the different electrochemical activities of the Fe oxides and the different impacts on the properties and composition of OM. Our findings shed light on the molecular mechanisms of mutual interactions between FA and Fe oxides with various facets.

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Bio-reduction of ferrihydrite-montmorillonite-organic matter complexes: Effect of montmorillonite and fate of organic matter

Cited by 47 publications

References 78 publications

Activity-based, genome-resolved metagenomics uncovers key populations and pathways involved in subsurface conversions of coal to methane

Activity-based, genome-resolved metagenomics uncovers key populations and pathways involved in subsurface conversions of coal to methane

Intrinsic enzyme‐like activity of magnetite particles is enhanced by cultivation with Trichoderma guizhouense

Fulvic Acid-Mediated Interfacial Reactions on Exposed Hematite Facets during Dissimilatory Iron Reduction

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