Coupled iron cycling and organic matter transformation across redox interfaces

Nature Reviews Earth & Environment, Journal Year: 2023, Volume and Issue: 4(9), P. 659 - 673

Published: Aug. 24, 2023

Language: Английский

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Mineral-Bound Trace Metals as Cofactors for Anaerobic Biological Nitrogen Fixation

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(18), P. 7206 - 7216

Published: April 28, 2023

Nitrogenase is the only known biological enzyme capable of reducing N2 to bioavailable NH3. Most nitrogenases use Mo as a metallocofactor, while alternative cofactors V and Fe are also viable. Both geological bioinformatic evidence suggest an ancient origin Mo-based nitrogenase in Archean, despite low concentration dissolved Archean oceans. This apparent paradox would be resolvable if mineral-bound were for nitrogen fixation by diazotrophs. In this study, bioavailability Mo, V, was determined incubating obligately anaerobic diazotroph Clostridium kluyveri with Mo-, V-, Fe-bearing minerals (molybdenite, cavansite, ferrihydrite, respectively) basalt under diazotrophic conditions. The results showed that C. utilized mineral-associated metals express genes fix nitrogen, measured reverse transcription quantitative polymerase chain reaction acetylene reduction assay, respectively. secreted chelating molecules extract from minerals. As result microbial weathering, mineral surface chemistry significantly changed, likely due coating exudates metal extraction. These provide important support nitrogenase, profound implications coevolution biosphere geosphere.

Language: Английский

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Mineral-mediated stability of organic carbon in soil and relevant interaction mechanisms

Eco-Environment & Health, Journal Year: 2024, Volume and Issue: 3(1), P. 59 - 76

Published: Jan. 3, 2024

Soil, the largest terrestrial carbon reservoir, is central to climate change and relevant feedback environmental health. Minerals are essential components that contribute over 60% of soil storage. However, how interactions between minerals organic shape transformation stability remains poorly understood. Herein, we critically review primary mechanisms, including sorption, redox reaction, co-precipitation, dissolution, polymerization, catalytic reaction. These interactions, highly complex with combination multiple processes, greatly affect through following processes: (1) formation or deconstruction mineral-organic association; (2) oxidative minerals; (3) polymerization (4) varying association according mineral transformation. Several pieces evidence related turnover during interaction in real eco-environment then demonstrated. We also highlight current research gaps outline priorities, which may map future directions for a deeper mechanisms-based understanding storage capacity considering its minerals.

Language: Английский

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Biochar-mediated remediation of uranium-contaminated soils: evidence, mechanisms, and perspectives

Biochar, Journal Year: 2024, Volume and Issue: 6(1)

Published: March 1, 2024

Abstract Soil contamination by uranium presents a burgeoning global environmental concern, exerting detrimental effects on both agricultural production and soil health. Biochar, carbonaceous material derived from biomass pyrolysis, exhibits considerable potential for remediating uranium-contaminated soils. However, comprehensive review of the biochar fate accumulation in soil–plant systems remains conspicuously absent. In this paper, sources are reviewed, impact immobilization detoxification is analyzed. We reviewed status soils globally found that mining activities currently main sources. Further meta-analysis revealed addition significantly reduced bioavailability shoot accumulation, their effect value 58.9% (40.8–76.8%) 39.7% (15.7–63.8%), respectively. Additionally, enhances microenvironment, providing favourable conditions promoting plant growth reducing mobility. focused mechanisms governing interaction between uranium, emphasising roles played surface complexation, reduction, ion exchange, physical adsorption. The modification intensifying these can promote immobilisation Finally, alleviates oxidative stress reduces tissues, thereby mitigating adverse development. Overall, our highlights capacity to remediate through diverse mechanisms, valuable insights sustainable remediation. Highlights Biochar mobility variety including limits its plants. Modified has been shown enhance effectiveness immobilising uranium. application not only promotes remediation but also improves quality. Graphical

Language: Английский

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Intrinsic properties of biochar for electron transfer

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 475, P. 146356 - 146356

Published: Oct. 5, 2023

Language: Английский

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Unrecognized Role of Organic Acid in Natural Attenuation of Pollutants by Mackinawite (FeS): The Significance of Carbon-Center Free Radicals

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(49), P. 20871 - 20880

Published: Nov. 29, 2023

Organic acid is prevalent in underground environments and, against the backdrop of biogeochemical cycles on Earth, holds significant importance degradation contaminants by redox-active minerals. While earlier studies role organic generation reactive oxygen species (ROS) primarily concentrated electron shuttle or ligand effects, this study delves into combined impacts decomposition and Mackinawite (FeS) oxidation contaminant transformation under dark aerobic conditions. Using bisphenol A (BPA) as a model, our findings showed that oxalic (OA) notably outperforms other acids enhancing BPA removal, attaining rate constant 0.69 h-1. Mass spectrometry characterizations, coupled with anaerobic treatments, advocate for molecule-O2 activation principal mechanism behind pollutant transformation. Comprehensive results unveiled carbon center radicals, initiated hydroxyl radical (•OH) attack, serve primary agents oxidation, accounting at least 93.6% total •OH generation. This dynamic, driven concurrent formation carbon-centered ensures steady supply electrons ROS The obtained information highlights OA natural attenuation pollutants offers innovative strategies FeS acid-coupled decontamination.

Language: Английский

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Review on intensified treatment of refractory wastewater in anaerobic digestion based on extracellular electron transfer: Mechanisms, strategies, and applications

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 489, P. 151456 - 151456

Published: April 18, 2024

Language: Английский

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Heating-Induced Redox Property Dynamics of Peat Soil Dissolved Organic Matter in a Simulated Peat Fire: Electron Exchange Capacity and Molecular Characteristics

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 2, 2025

Peatlands store one-third of the world's soil organic carbon. Globally increased fires altered peat matter chemistry, yet redox property and molecular dynamics peat-dissolved (PDOM) during remain poorly characterized, limiting our understanding postfire biogeochemical processes. Clarifying these dynamic changes is essential for effective peatland fire management. This study demonstrates temperature-dependent in electron exchange capacity (EEC) PDOM by simulating burning, significantly affecting microbial iron reduction. At low temperatures (200-250 °C), EEC remains constant releasing more phenolic moieties to enhance electron-donating (EDC). Higher (500 °C) diminish 90% consuming phenolic-quinone moieties. Pyrolytic (pyPDOM) contributes 40% soil, with this contribution declining at higher temperatures. Phenolic-quinone primary redox-active pyPDOM. Fourier transform ion cyclotron resonance mass spectrometry analysis shows that EDC depends on types than abundance, monophenol-like molecules (

Language: Английский

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Promotion of Humic Acid Transformation by Abiotic and Biotic Fe Redox Cycling in Nontronite

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(48), P. 19760 - 19771

Published: Nov. 16, 2023

The redox activity of Fe-bearing minerals is coupled with the transformation organic matter (OM) in dynamic environments, but underlying mechanism remains unclear. In this work, a Fe cycling experiment nontronite (NAu-2), an Fe-rich smectite, was performed via combined abiotic and biotic methods, accompanying humic acid (HA) as representative OM investigated. Chemical reduction subsequent reoxidation NAu-2 produced abundant hydroxyl radicals (thereafter termed ·OH) that effectively transformed chemical molecular composition HA. More importantly, HA served more premium electron donor/carbon source to couple biological Fe(III) reoxidized by Geobacter sulfurreducens, model Fe-reducing bacterium. Destruction aromatic structures formation carboxylates were mechanisms responsible for transforming into energetically bioavailable substrate. Relative unaltered HA, increased extent bioreduction 105%, oxidation even mineralization resulting bleached microbial products cell debris. ·OH slightly decreased shuttling capacity bioreduction. Our results provide mechanistic explanation rapid driven redox-fluctuating environments.

Language: Английский

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Molecular transformation of petroleum compounds by hydroxyl radicals produced upon oxidation of reduced nontronite

Geochimica et Cosmochimica Acta, Journal Year: 2024, Volume and Issue: 371, P. 31 - 51

Published: March 4, 2024

Language: Английский

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