Fe(II) Redox Chemistry in the Environment

Chemical Reviews, Год журнала: 2021, Номер 121(13), С. 8161 - 8233

Опубликована: Июнь 18, 2021

Iron (Fe) is the fourth most abundant element in earth's crust and plays important roles both biological chemical processes. The redox reactivity of various Fe(II) forms has gained increasing attention over recent decades areas (bio) geochemistry, environmental chemistry engineering, material sciences. goal this paper to review these advances current state knowledge environment. Specifically, comprehensive focuses on four types species including aqueous Fe(II), complexed with ligands, minerals bearing structural sorbed mineral oxide surfaces. formation pathways, factors governing reactivity, insights into potential mechanisms, comparison, characterization techniques are discussed reference breakthroughs field where possible. We also cover applications zerovalent iron, microbial processes, biogeochemical cycling carbon nutrients, their abiotic oxidation related processes natural engineered systems.

Язык: Английский

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Iron-mediated organic matter decomposition in humid soils can counteract protection

Nature Communications, Год журнала: 2020, Номер 11(1)

Опубликована: Май 7, 2020

Soil organic matter (SOM) is correlated with reactive iron (Fe) in humid soils, but Fe also promotes SOM decomposition when oxygen (O2) becomes limited. Here we quantify Fe-mediated OM protection vs. by adding 13C dissolved (DOM) and 57FeII to soil slurries incubated under static or fluctuating O2. We find uniformly protects only oxic conditions, DOM are added together: de novo FeIII phases suppress mineralization 35 47%, respectively. Conversely, alone increases 8% following oxidation 57FeIII. Under O2 limitation, 57FeIII preferentially reduced, increasing anaerobic of 74% 32‒41%, Periodic limitation common so does not intrinsically protect OM; rather require their own physiochemical contribute persistence.

Язык: Английский

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

Environmental Science & Technology, Год журнала: 2023, Номер 57(23), С. 8628 - 8637

Опубликована: Май 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.

Язык: Английский

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

Eco-Environment & Health, Год журнала: 2024, Номер 3(1), С. 59 - 76

Опубликована: Янв. 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.

Язык: Английский

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Mutual Interactions between Reduced Fe-Bearing Clay Minerals and Humic Acids under Dark, Oxygenated Conditions: Hydroxyl Radical Generation and Humic Acid Transformation

Environmental Science & Technology, Год журнала: 2020, Номер 54(23), С. 15013 - 15023

Опубликована: Сен. 29, 2020

Hydroxyl radicals (·OH) exert a strong impact on the carbon cycle due to their nonselective and highly oxidizing nature. Reduced iron-containing clay minerals (RIC) are one of major contributors formation ·OH in dark environments, but interactions with humic acids (HA) poorly known. Here, we investigate mutual between RIC HA under oxygenated conditions. decreased oxidation rate structural Fe(II) significantly promoted yield. dissolved fraction from form an aqueous Fe(II)–HA complex. were generated through both heterogeneous (through Fe(II)) homogeneous pathways species). RIC-mediated production by providing H2O2 react electrons regenerate Fe(II)–HA. This efficient pathway was responsible for increased Abundant molecular size, bleached chromophores, oxygen-containing functional groups HA. These changes resembled photochemical transformation The interaction redox-fluctuating environments provides new fast turnover recalcitrant organic matters clay- HA-rich ecosystems such as tropical forest soils tidal marsh sediments.

Язык: Английский

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Biogeochemical cycling of iron (hydr-)oxides and its impact on organic carbon turnover in coastal wetlands: A global synthesis and perspective

Earth-Science Reviews, Год журнала: 2021, Номер 218, С. 103658 - 103658

Опубликована: Май 5, 2021

Coastal wetlands host large and dynamic reservoirs of organic carbon (C) are also biogeochemical hotspots for a wide range Fe (hydr-)oxides with different chemical reactivities, properties, functions. The cycling these iron is closely coupled to that C, which in turn strongly influences the magnitude dynamics C turnover ecosystems. This review synthesizes summarizes current knowledge distribution, turnover, controls (hydr-)oxides, as well their ecological roles impacts on coastal wetland ecosystems globally. Regional hydro-geochemical processes anthropogenic activities uplands soil texture exert first-order control abundance distribution soils, while plant roots macro-organisms act important biological drivers formation, transformation, associated both rhizosphere/burrows bulk soils. reported rates dissimilatory reduction (DFeR) correlated incubation temperature sizes reactive Fe(III) phases. However, contributions DFeR total anaerobic oxidation were found be only size pools, meaning all identified contributing accumulation formation hydroxides could increase importance DFeR-dominated respiratory pathway suppress sulfate methanogenesis. Additionally, plaques dominated by amorphous formed cycled close interaction roots, likely provide several functions contribute maintaining high levels productivity under environmental stresses. features findings presented this not an improved understanding cycle wetlands, but basis future studies some highlighted key research areas. Such will further our ability understand predict how size, stability, respond affect global climate change.

Язык: Английский

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Extensive dark production of hydroxyl radicals from oxygenation of polluted river sediments

Chemical Engineering Journal, Год журнала: 2019, Номер 368, С. 700 - 709

Опубликована: Март 4, 2019

Язык: Английский

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Iron-bound organic carbon and their determinants in peatlands of China

Geoderma, Год журнала: 2021, Номер 391, С. 114974 - 114974

Опубликована: Фев. 17, 2021

Язык: Английский

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Synchronous sequestration of cadmium and fulvic acid by secondary minerals from Fe(II)-catalyzed ferrihydrite transformation

Geochimica et Cosmochimica Acta, Год журнала: 2022, Номер 334, С. 83 - 98

Опубликована: Авг. 9, 2022

Язык: Английский

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Retention of soil organic matter by occlusion within soil minerals

Reviews in Environmental Science and Bio/Technology, Год журнала: 2022, Номер 21(3), С. 727 - 746

Опубликована: Июль 30, 2022

Язык: Английский

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