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

Environmental Science & Technology, Год журнала: 2024, Номер 58(22), С. 9669 - 9678

Опубликована: Май 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.

Язык: Английский

---

Agricultural amendments enhanced the redox cycling of iron species and hydroxyl radical formation during redox fluctuation of paddy soil

Journal of Hazardous Materials, Год журнала: 2025, Номер 487, С. 137175 - 137175

Опубликована: Янв. 13, 2025

Язык: Английский

---

From Bulk to Nano: Formation, Features, and Functions of Nano-Black Carbon in Biogeochemical Processes

Environmental Science & Technology, Год журнала: 2024, Номер 58(36), С. 15910 - 15925

Опубликована: Авг. 27, 2024

Globally increasing wildfires and widespread applications of biochar have led to a growing amount black carbon (BC) entering terrestrial ecosystems. The significance BC in sequestration, environmental remediation, the agricultural industry has long been recognized. However, formation, features, functions nanosized BC, which is one most active fractions continuum during global climate change, are poorly understood. This review highlights surface reactivity (sorption, redox, heteroaggregation), biotic, abiotic transformations nano-BC, its major differences compared other engineered nanomaterials. Potential nano-BC including suspending agent, soil amendment, nanofertilizer elucidated based on unique properties functions. Future studies suggested develop more reliable detection techniques provide multidimensional information samples, explore critical role promoting planetary health from perspective, extend multifield with lower footprint but higher efficiency.

Язык: Английский

---

The Effect of Redox Fluctuation on Carbon Mineralization in Riparian Soil: An Analysis of the Hotspot Zone of Reactive Oxygen Species Production

Water Research, Год журнала: 2024, Номер 265, С. 122294 - 122294

Опубликована: Авг. 18, 2024

Язык: Английский

---

Unveiling the barriers of Cd translocation from soil to rice: Insights from continuous flooding

The Science of The Total Environment, Год журнала: 2024, Номер 946, С. 174265 - 174265

Опубликована: Июнь 25, 2024

Язык: Английский

---

Visualizing Hydrogen Peroxide Diffusion in Soils with Precipitation-Based Fluorescent Probe

Environmental Science & Technology, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

Hydrogen peroxide (H2O2)-based advanced oxidation technology has emerged as a cost-effective and green solution for tackling soil pollution. Given the highly heterogeneous nature of soil, effectiveness H2O2 remediation is significantly influenced by its diffusion distance in soils. However, dynamics effective range remain largely unexplored, primarily due to lack analytical methods mapping This study introduces precipitation-based fluorescent probe (PFP) method situ, high-resolution (micrometer scale) Using PFP method, we visualized real-time various types soils, revealing distinct patterns with rates ranging from 0.011 >0.56 mm min–1. The observed differences are associated permeability. Additionally, soils exhibited wide distances, 0.22 >11 20 min. Soil's reactivity decomposition, previously overlooked factor, critical determining H2O2. We further demonstrate that efficacy pivotal factor controlling pollutant degradation efficiency. These findings enhance our understanding reagent processes remediation, informing optimization more efficient strategies.

Язык: Английский

---

Microscale Spatiotemporal Variation of Reactive Oxygen Species in the Charosphere: Underlying Formation Mechanism and Their Role in CO₂ Emission

Environmental Science & Technology, Год журнала: 2025, Номер unknown

Опубликована: Янв. 23, 2025

Charosphere, a highly active zone between biochar and surrounding soil, is widely present in agricultural wildfire-affected soils, yet whether reactive oxygen species (ROS) are produced within the charosphere remains unclear. Herein, production spatiotemporal evolution of ROS were explored. In situ capture visualized gradual decrease with increasing distance from biochar/soil interface. Temporally, O2•- H2O2 contents initially increased then declined incubation time, peaking at 3.04 5.40 μmol kg-1, respectively, while •OH content decreased continuously. High-throughput sequencing revealed that dissolved (DBC) facilitated by promoting growth bacteria electron-releasing capacity, such as Bacteroidetes, Acidobacteria, Actinobacteria, Chloroflexi. Additionally, adding electron transfer-weakened DBC significantly (ANOVA, P < 0.05), demonstrating also served shuttle electron-storing materials to promote accelerating transfer. This was further confirmed via fluorescence imaging, which visually showed stronger transfer ability near soil/biochar surface. Inhibition isotope experiments critical role CO2 emissions, primarily soil organic carbon. study highlights prevalent overlooked hotspot, advancing our understanding carbon turnover soils.

Язык: Английский

---

Regulation of organic matter Consumption, Nitrification, and iron reduction using magnetite nanoparticles in paddy Soil: Implications for anaerobic carbon sequestration

Chemical Engineering Journal, Год журнала: 2025, Номер unknown, С. 160478 - 160478

Опубликована: Фев. 1, 2025

Язык: Английский

---

Biotic and abiotic transformations of aqueous film-forming foam (AFFF)-derived emerging polyfluoroalkyl substances in aerobic soil slurry

Water Research, Год журнала: 2025, Номер 276, С. 123284 - 123284

Опубликована: Фев. 11, 2025

Язык: Английский

---

Enhanced removal of perfluorooctanoic acid and perfluorooctane sulphonic acid by direct current in iron-based constructed wetlands

Water Research, Год журнала: 2025, Номер 277, С. 123302 - 123302

Опубликована: Фев. 15, 2025

Язык: Английский

---