Cu–Fe Synergistic Active Sites Boost Kinetics of Electrochemical Nitrate Reduction

Advanced Functional Materials, Год журнала: 2024, Номер 34(21)

Опубликована: Янв. 31, 2024

Abstract Electrochemical conversion of nitrate offers an efficient solution to pollution and a sustainable strategy for ammonia generation. Cu Fe bimetallic electrocatalysts exhibit excellent electrochemical reduction (NO 3 RR) reactivity but the conventional preparation is complex time‐consuming this reaction still suffers from unsatisfied kinetic unidentified mechanisms. Herein, in situ electrodeposition employed induce modify active sites iron‐based N‐doping carbon nanofiber electrode (Fe/Fe C@NCNFs) during NO RR Cu‐contained solution. Benefiting synergistic effect between Cu─Fe/Fe C@NCNFs electrode, superior activity rate‐determining (*NO *NO 2 ) reduced energy barriers following deoxidation hydrogenation steps are achieved. Compared with Fe/Fe C@NCNFs‐500, pseudo‐first‐order (PFO) rate constant by demonstrates nearly two‐fold improvement high current efficiencies over wide pH voltage range. Furthermore, maximum ─N removal capacity N selectivity reach 15593.8 mg g −1 ca. 92% after twenty cycles. This work avenue highly design, paving more insights into interactions site construction performance.

Язык: Английский

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Microplastics strengthen nitrogen retention by intensifying nitrogen limitation in mangrove ecosystem sediments

Environment International, Год журнала: 2024, Номер 185, С. 108546 - 108546

Опубликована: Март 1, 2024

Mangrove wetlands are hotspots of the global nitrogen (N) cycle and important sinks microplastics (MPs) due to their ecotone location between terrestrial marine ecosystems. However, effects MPs on N processes in mangrove ecosystems still poorly understood. Thus, present study assessed impacts by adding sediments a microcosm incubation experiment. The results showed that increased dissolved organic carbon nitrate but reduced ammonium contents sediments. C:N stoichiometric N:C-acquiring enzymatic ratios, indicating an intensified limitation following exposure MPs. decreased microbial community diversity shifted sediment communities from r- K-strategists, consistent with limitation. In response, dissimilatory reduction (DNRA) rates while nitrous oxide (N2O) production suggesting more efficient utilization treatments. heteroatoms such as PLA- PVC-MPs, DNRA 67.5–78.7%, exhibiting stronger impact than PE-MPs. variation partitioning analysis revealed variances N2O could be attributed synergistic physicochemical properties, nutrient limitation, Overall, this provides pertinent insights into new source turnover

Язык: Английский

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Effects of intensive oyster farming on nitrogen speciation in surface sediments from a typical subtropical mariculture bay

The Science of The Total Environment, Год журнала: 2024, Номер 916, С. 170092 - 170092

Опубликована: Янв. 19, 2024

Язык: Английский

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Unveiling the eutrophication crisis: 20 years of nutrient development in Zhanjiang Bay, China

Frontiers in Marine Science, Год журнала: 2024, Номер 11

Опубликована: Июнь 3, 2024

Coastal eutrophication is a major issue of marine pollution. The main factors controlling must be identified to ensure effective environmental management according the respective local conditions. Zhanjiang Bay (ZJB), located northwest South China Sea, semi-closed bay influenced by complex water flows and development surrounding cities. In this study, we investigated nutrient concentrations compositions in ZJB seawater over past 20 years influencing based on several field investigations from 2006 2022 historical data. High dissolved inorganic phosphorus (DIP) nitrogen (DIN) were contributors severe long-term ZJB; however, light was observed outer bay, primarily caused chemical oxygen demand (COD) DIP. primary sources COD nutrients riverine freshwater, sewage outfalls, mariculture domestic effluents carried rivers. Tidal effects diluted with thereby playing key role redistribution. DIN: DIP ratio showed restriction excess phosphorus, owing activities. Marine undertakings can exert various impacts quality. Eliminating illegal aquaculture launching tailwater treatment improve quality, whereas practices such as channel dredging may worsen it. This study demonstrates intricate dynamics ecosystem offers valuable insights for conservation efforts.

Язык: Английский

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Feeding global aquaculture

Science Advances, Год журнала: 2024, Номер 10(42)

Опубликована: Окт. 16, 2024

The growth of animal aquaculture requires ever more feed. Yet, fish and crustacean farming is argued to be sustainable because wild use low has improved over time. Here, accounting for trimmings by-products from in feed, using four different sources industry-reported feed composition data, we find ratios inputs farmed outputs 0.36 1.15—27 307% higher than a previous estimate 0.28. Furthermore, metric that incorporates mortality during capture excludes unfed systems raises the mortality–to–farmed output ratio 0.57 1.78. We also evaluate terrestrial ingredients feeds. Widely cited estimates declines 1997 2017 entailed trade-off fivefold increase crops same period. Our assessment challenges sustainability fed its role food security.

Язык: Английский

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The urgent need to reduce phosphorus discharges for sustainable mangrove wetland management

Water Research, Год журнала: 2024, Номер 258, С. 121821 - 121821

Опубликована: Май 22, 2024

Язык: Английский

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The microbial community structure and nitrogen cycle of high-altitude pristine saline lakes on the Qinghai-Tibetan plateau

Frontiers in Microbiology, Год журнала: 2024, Номер 15

Опубликована: Июль 9, 2024

The nitrogen (N) cycle is the foundation of biogeochemistry on Earth and plays a crucial role in global climate stability. It one most important nutrient cycles high-altitude lakes. almost entirely dependent redox reactions mediated by microorganisms. However, cycling microbial communities saline lakes Qinghai-Tibet Plateau (QTP), world's "third pole" has not been investigated extensively. In this study, we used metagenomic approach to investigate four pristine Altun mountain QTP. We observed that

Язык: Английский

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Changes in sediment greenhouse gases production dynamics in an estuarine wetland following invasion by Spartina alterniflora

Frontiers in Microbiology, Год журнала: 2024, Номер 15

Опубликована: Июль 12, 2024

Invasive Spartina alterniflora ( S. ) has significant impacts on sediment biogeochemical cycling in the tidal wetlands of estuaries and coasts. However, impact exotic invasion greenhouse gases (GHGs) production dynamics sediments remain limited. Here, we investigated physicochemical properties, GHGs rates, microbial gene abundances a native Cyperus malacensis habitat three invasive habitats (6-, 10-, 14-year) Minjiang River Estuary, China. The methane (CH 4 ), carbon dioxide (CO 2 nitrous oxide (N O) rates varied both spatially seasonally, while (bacterial fungal abundances) organic matter (TOC TN) only spatially. were also characterized by higher values surface (0–10 cm) compared to subsurface (10–20 seasonal variations with summer than winter. can significantly increase CH CO matter, p < 0.05). Temperature, most dominating factor controlling spatio-temporal rates. Overall, our findings highlighted role regulating coastal wetland provided fundamental data for estimating emissions sequestration complex wetlands.

Язык: Английский

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Editorial: Linking microbial-driven key processes with carbon and nitrogen cycling in estuarine, coastal, and the nearshore areas

Frontiers in Microbiology, Год журнала: 2024, Номер 15

Опубликована: Март 18, 2024

Editorial: Linking microbial-driven key processes with carbon and nitrogen cycling in estuarine, coastal, the nearshore areas

Язык: Английский

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Impact of typhoons on the ecological environment of the Pearl River Estuary in the summer of 2021—a study of an algal bloom event

Frontiers in Marine Science, Год журнала: 2024, Номер 11

Опубликована: Май 10, 2024

In the summer of 2021, two typhoons, Typhoon Cempaka and Lupit, passed through Pearl River Estuary (PRE), resulting in a noticeable chlorophyll-a (Chla) bloom event on west side PRE. Utilizing coupled hydrodynamic-ecological model (ROMS-CoSiNE), we investigated changes marine environment during two-typhoon period explored underlying mechanisms involved. Our effectively reproduces spatial characteristics typhoon-induced algal blooms. The results suggest that westward invasion plume has predominant impact alterations biochemical elements. For further quantitative analyses, utilized to determine Chla concentration budget region assess dominant mechanism, particularly focusing horizontal advection. findings indicated events are mainly attributed straightforward physical namely, phytoplankton transportation, rather than nutrient-induced growth. study also revealed different growth processes simulated species did not contribute positively increased concentrations. However, research is needed investigate impacts functional groups ecological under influence typhoons. This enhances understanding response environments coastal areas

Язык: Английский

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