Effects of Fe oxides and their redox cycling on Cd activity in paddy soils: A review

Journal of Hazardous Materials, Journal Year: 2023, Volume and Issue: 456, P. 131665 - 131665

Published: May 19, 2023

Language: Английский

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Redox Oscillations Activate Thermodynamically Stable Iron Minerals for Enhanced Reactive Oxygen Species Production

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(23), P. 8628 - 8637

Published: May 31, 2023

Reactive oxygen species (ROS) play key roles in driving biogeochemical processes. Recent studies have revealed nonphotochemical electron transfer from redox-active substances (e.g., iron minerals) to as a new route for ROS production. Yet, naturally occurring minerals mainly exist thermodynamically stable forms, restraining their potential Here, we report that tide-induced redox oscillations can activate enhanced •OH production intertidal soils (15.8 ± 0.5 μmol/m2) was found be 5.9-fold more efficient than those supratidal soils. Moreover, incubation of under tidal fluctuations dramatically by 4.3-fold. The hydrology triggered alternation between biotic reduction and abiotic oxidation could accelerate the reactive ferrous ions amorphous ferric oxyhydroxides, making into metastable phases (RAMPs) with reduced crystallinity promoting surface electrochemical activities. Those RAMPs displayed activity Investigations nationwide coastal verified ubiquitously Our study demonstrates effective formation hydrological perturbations, which provides insights natural sources.

Language: Английский

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The generation and transformation mechanisms of reactive oxygen species in the environment and their implications for pollution control processes: a review.

Environmental Research, Journal Year: 2024, Volume and Issue: 260, P. 119592 - 119592

Published: July 14, 2024

Language: Английский

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Soil carbon and nitrogen cycles driven by iron redox: A review

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 918, P. 170660 - 170660

Published: Feb. 6, 2024

Language: Английский

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Seasonal and Spatial Fluctuations of Reactive Oxygen Species in Riparian Soils and Their Contributions on Organic Carbon Mineralization

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(16), P. 7066 - 7077

Published: April 10, 2024

Reactive oxygen species (ROS) are ubiquitous in the natural environment and play a pivotal role biogeochemical processes. However, spatiotemporal distribution production mechanisms of ROS riparian soil remain unknown. Herein, we performed uninterrupted monitoring to investigate variation at different sites Weihe River zone throughout year. Fluorescence imaging quantitative analysis clearly showed soils. The concentration superoxide (O

Language: Английский

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Strong Substance Exchange at Paddy Soil-Water Interface Promotes Nonphotochemical Formation of Reactive Oxygen Species in Overlying Water

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(17), P. 7403 - 7414

Published: April 17, 2024

Photochemically generated reactive oxygen species (ROS) are widespread on the earth's surface under sunlight irradiation. However, nonphotochemical ROS generation in water (e.g., paddy overlying water) has been largely neglected. This work elucidated drivers of and its spatial distribution undisturbed water, by combining imaging technology with situ monitoring. It was found that H2O2 concentrations formed three waters could reach 0.03–16.9 μM, profiles exhibited heterogeneity. The O2 planar-optode indicated redox interfaces were not always at soil–water interface but also possibly layer, depending soil properties. facilitated a rapid turnover reducing oxidizing substances, creating an ideal environment for ROS. Additionally, electron-donating capacities increased 4.5–8.4 times compared to top layers. Importantly, field investigation results confirmed sustainable •OH through pathways constituted significant proportion total daily production (>50%), suggesting comparable or even greater role than photochemical generation. In summary, process reported this study greatly enhances understanding natural processes soils.

Language: Английский

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Microscale Spatiotemporal Variation and Generation Mechanisms of Reactive Oxygen Species in the Rhizosphere of Ryegrass: Coupled Biotic–Abiotic Processes

Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(22), P. 16483 - 16493

Published: Nov. 3, 2022

Reactive oxygen species (ROS) play key roles in soil biogeochemical processes, yet the occurrence and accumulation of ROS rhizosphere are poorly documented. Herein, we first developed a ROS-trapping membrane to situ determine ryegrass then quantified temporal spatial variations representative (i.e., O2•─, H2O2, •OH). Fluorescence imaging clearly visualized production rhizosphere. Both O2•─ H2O2 content increased declined throughout life cycle ryegrass, while •OH concentration decreased continuously. Spatially, contents remained at relatively high level 0-5 mm descended with increasing distance. The concentrations different soils followed order black > latosol yellow-brown tier ∼ red soil. Analysis properties suggested that both biotic factors (microbial community) abiotic (Fe(II) water-soluble phenols) played critical production. combined including Fe(II) phenol-mediated electron transfer, microbial community-driven extracellular release, Fe(II)/Fe(III) cycling, may be responsible for These findings provide insights into ROS-associated effects inspiration phytoremediation pollutants element cycling.

Language: Английский

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Water Vapor Condensation on Iron Minerals Spontaneously Produces Hydroxyl Radical

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(23), P. 8610 - 8616

Published: May 25, 2023

The hydroxyl radical (•OH) is a potent oxidant and key reactive species in mediating element cycles pollutant dynamics the natural environment. source of •OH historically linked to photochemical processes (e.g., photoactivation organic matter or iron minerals) redox chemical reaction microbe-excreted reduced iron/natural matter/sulfide-released electrons with O2 soils sediments). This study revealed ubiquitous production via water vapor condensation on mineral surfaces. Distinct productions (15–478 nM condensation) were observed all investigated minerals abundant occurrence (i.e., goethite, hematite, magnetite). spontaneous triggered by contact electrification Fenton-like activation hydrogen peroxide (H2O2) at water–iron interface. Those drove efficient transformation pollutants associated After 240 evaporation, bisphenol A carbamazepine degraded 25%–100% 16%–51%, respectively, forming •OH-mediated arene/alkene hydroxylation products. Our findings largely broaden •OH. Given existence Earth's surface, those newly discovered could play role carbon

Language: Английский

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New Barrier Role of Iron Plaque: Producing Interfacial Hydroxyl Radicals to Degrade Rhizosphere Pollutants

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 58(1), P. 795 - 804

Published: Dec. 14, 2023

Iron plaque, as a natural barrier between rice and soil, can reduce the accumulation of pollutants in by adsorption, contributing to safe production contaminated soil. In this study, we unveiled new role iron i.e., producing hydroxyl radicals (·OH) activating root-secreted oxygen degrade pollutants. The ·OH was produced on plaque surface then diffused interfacial layer rhizosphere environment. activated via successive three-electron transfer produce ·OH, involving superoxide hydrogen peroxide intermediates. structural Fe(II) played dominant rather than adsorbed Fe(II), since thermodynamically more favorable for activation. vacancies accompanied an important activation ·OH. selectively degraded that could be onto less affected environments free This study uncovered oxidative mediated its reshaping our understanding rice.

Language: Английский

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Critical Role of Mineral Fe(IV) Formation in Low Hydroxyl Radical Yields during Fe(II)-Bearing Clay Mineral Oxygenation

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(22), P. 9669 - 9678

Published: May 21, 2024

In subsurface environments, Fe(II)-bearing clay minerals can serve as crucial electron sources for O2 activation, leading to the sequential production of O2•–, H2O2, and •OH. However, observed •OH yields are notably low, underlying mechanism remains unclear. this study, we investigated oxidants from oxygenation reduced Fe-rich nontronite NAu-2 Fe-poor montmorillonite SWy-3. Our results indicated that dependent on mineral Fe(II) species, with edge-surface exhibiting significantly lower compared those interior Fe(II). Evidence in situ Raman Mössbauer spectra chemical probe experiments substantiated formation structural Fe(IV). Modeling elucidate pathways Fe(IV) respectively consume 85.9–97.0 14.1–3.0% electrons H2O2 decomposition during oxygenation, Fe(II)edge/Fe(II)total ratio varying 10 90%. Consequently, these findings provide novel insights into low different minerals. Since selectively degrade contaminants (e.g., phenol), generation should be taken consideration carefully when assessing natural attenuation redox-fluctuating environments.

Language: Английский

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