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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Tide-Triggered Production of Reactive Oxygen Species in Coastal Soils

Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(16), P. 11888 - 11896

Published: July 11, 2022

We report an unrecognized, tidal source of reactive oxygen species (ROS). Using a newly developed ROS-trapping gel film, we observed hot spots for ROS generation within ∼2.5 mm coastal surface soil. Kinetic analyses showed rapid production hydroxyl radicals (•OH), superoxide (O2•–), and hydrogen peroxide (H2O2) upon shift from high tide to low tide. The exhibited distinct rhythmic fluctuation. oscillations the redox potential dissolved concentration followed same pattern as •OH production, suggesting alternating oxic–anoxic conditions main geochemical drive production. Nationwide field investigations confirmed widespread sustainable via processes (22.1–117.4 μmol/m2/day), which was 5- 36-fold more efficient than those classical photochemical routes (1.5–7.6 μmol/m2/day). Analyses soil physicochemical properties demonstrated that redox-metastable components such redox-active iron minerals organic matter played key role in storing electrons at shuttling infiltrated Our work sheds light on ubiquitous but previously overlooked ROS, may accelerate carbon metal cycles well pollutant degradation soils.

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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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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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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Manganese Dioxides Induce the Transformation and Protection of Dissolved Organic Matter Simultaneously: A Significance of Crystallinity

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

Published: Jan. 9, 2025

Interactions between manganese dioxides (MnO2) and dissolved organic matter (DOM) have long been the subject of scientific inquiry. However, effect MnO2 crystallinity on DOM fate remains unclear. Herein, we comprehensively investigate adsorption, protection, mineralization by with various crystallinities (order crystallinity: γ-30 < γ-90 γ-120). The results show that adsorption is positively correlated specific surface area (SSA) MnO2; largest SSA adsorbs highest amount DOM, resulting in protection. γ-120 a smaller could induce Maillard reaction thereby promote formation geopolymerized matter, leading to reduced bioavailability DOM. Furthermore, capability mineralize decreases order > γ-30, it determined both Mn4+ hydroxyl radical (·OH) content. In particular, contribution radical-based oxidation ·OH 64.8, 47.4, 23.7% for γ-90, γ-120, respectively. We propose may significant but hitherto unexplored influence global carbon cycle over geological time.

Language: Английский

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Interactions between organic matter and Fe oxides at soil micro-interfaces: Quantification, associations, and influencing factors

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 855, P. 158710 - 158710

Published: Sept. 11, 2022

Iron (Fe) oxides are widely recognized to prevent the degradation of organic matter (OM) in environments, thereby promoting persistence carbon (OC) soils. Thus, discerning association mechanisms Fe and OC interactions is key effectively influencing dynamics extent C cycling Previous studies have focused on i) quantifying oxide-bound (Fe-OC) individual ii) investigating distribution adsorption capacity Fe-OC, iii) assessing redox transformation Fe-OC. Furthermore, widespread application high-tech instrumentation methods has greatly contributed a better understanding mechanism mineral assemblages past few decades. However, literature reviews comprehensively summarized Fe-OC distributions, associations, characteristics soil-plant systems. Here, contents among different environments reviewed. In addition, processes related OM occurring at mineral-organic interfaces also described. Recent highlighted that diverse occur between OC, with compounds adhering due their huge specific surfaces area active reaction sites. Moreover, we review for micro-interfaces. Lastly, developmental prospects coupled geochemical soil molecular- nano-scales outlined. The summary suggests combined advanced techniques should be used future research explore micro-interfaces situ descriptions assemblages. This need consider functional spatial complexity typical soil/sediment where occur.

Language: Английский

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Redox-induced transformation of potentially toxic elements with organic carbon in soil

Carbon Research, Journal Year: 2022, Volume and Issue: 1(1)

Published: June 29, 2022

Abstract Soil organic carbon (SOC) is a crucial component that significantly affects the soil fertility, remediation, and sequestration. Here, we review redox-induced transformation of potentially toxic elements (PTEs) through abiotic impact SOC. The complex composition SOC includes humus, pyrogenic (e.g., biochar), dissolved matter, anthropogenic compost), with varying concentrations properties. primary redox moieties on are surface functionalities phenol, quinone, N/S-containing functional groups), environmentally persistent free radicals, graphitic structures, their contents highly variable. Owing to these rich moieties, can directly affect reduction oxidation PTEs in soil, such as Cr(VI) As(III) oxidation. In addition, interactions between (i.e., O 2 , Fe, Mn minerals) cause PTEs. formation reactive oxygen species, Fe(II), Mn(III)/Mn(II) main contributor PTEs, including As(III)/Cr(III)/Tl(I) We articulated both positive negative effects which could guide remediation efforts. Further scientific studies necessary better understand potential transformations by SOC, considering complicated variable composition, biotic environment. Graphical

Language: Английский

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