24年12月6日文献情报（12篇）

24年12月6日文献情报

1. 题目: Identifying drivers of global spatial variability in organic carbon sequestration in tidal marsh sediments.

文章编号: N24120612
期刊: Science of the Total Environment
作者: Mona Huyzentruyt, Jean-Philippe Belliard, Neil Saintilan, Stijn Temmerman
更新时间: 2024-12-06
摘要: Tidal marshes are among the most efficient ecosystems on Earth for carbon sequestration with a globally averaged rate of sediment organic carbon accumulation of 210 g C m-2 y-1, but with large spatial variations between marsh sites from 20 to 1700 g C m-2 y-1 worldwide. Previous studies identified certain environmental drivers of spatial variability of carbon sequestration in tidal marshes, but have considered so far a rather limited number of environmental variables. In this study, we started from a large dataset that includes 477 tidal marsh sites scattered worldwide and investigated the influence of 12 different environmental variables on sediment organic carbon content, density and accumulation rates using a Random Forest regression algorithm. We find that variability in organic carbon content is mostly explained by variables determining the tidal inundation regime, such as tidal range and tidal pattern, where high tidal range corresponds with low values of organic carbon content, potentially due to increased soil aeration and decomposition. Organic carbon density is found to increase with increasing marsh vegetation productivity and vegetation cover, which may promote plant carbon inputs into the sediment bed and trapping of sediments supplied by the tides. Further, organic carbon accumulation rate is mostly controlled by sea level rise, which has a positive effect on sediment accretion rate and thus on organic carbon accumulation rate. Our findings highlight that it is not one or a few environmental variables, but the interaction between different variables that affects the spatial variability of organic carbon sequestration in tidal marsh sediments.
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2. 题目: Integrating kinetic modeling and experimental insights: PFAS electrochemical degradation in concentrated streams with a focus on organic and inorganic effects

文章编号: N24120611
期刊: Journal of Hazardous Materials
作者: Fatemeh Asadi Zeidabadi, Pezhman Abbasi, Ehsan Banayan Esfahani, Madjid Mohseni
更新时间: 2024-12-06
摘要: This study investigated the impact of organic and inorganic constituents on electrochemical degradation of per- and poly-fluoroalkyl substances (PFAS) in a sulfate-based brine from regeneration of spent ion exchange (IX) resin. The system's performance was assessed in the presence of natural organic matter (NOM) and common inorganic constituents: chloride, nitrate, and bicarbonate. Results revealed distinct outcomes based on constituent type, concentration, and specific PFAS variant. NOM hindered PFAS decomposition, especially for more hydrophobic compounds. Chloride reduced degradation and defluorination efficiencies through competitive interactions with PFAS for the anode’s active sites and scavenging effects on SO₄^•− and ^•OH. Nitrate and bicarbonate minimally impacted degradation but significantly reduced defluorination. Investigating the electrochemical process in real brine solutions showed higher efficiency and lower electrical energy consumption when methanol was distilled, as methanol scavenges reactive radicals and competes for active anode sites. A kinetic model was also developed to determine the direct electron transfer (DET) and mass transfer coefficients for the species present, considering both surface and bulk solution interactions. The model predicted mass transfer (mol m⁻² s⁻¹) and DET (m² mol⁻¹ s⁻¹) coefficients of 6:2 FTCA, PFOA, GenX, and PFBA to be (5.0 ×10⁻¹⁰, 3.7 ×10¹¹), (1.0 ×10⁻⁹, 8.0 ×10⁸), (6.0 ×10⁻⁸, 7.5 ×10⁸), and (6.2 ×10⁻⁸, 4.2 ×10⁸), respectively.
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3. 题目: Humic acid promotes pathway of chloronitrobenzene cathodic reduction shunting from atomic H* to direct electron transfer

文章编号: N24120610
期刊: Water Research
作者: Caiqin Wang, Hangzhe Chen, Yunjie Zhou, Tao Wen, Junjie Shao, Daoyong Zhang, Xiangliang Pan
更新时间: 2024-12-06
摘要: Progress mechanism of humic acid (HA) interacting with chloronitrobenzenes (ClNBs) and affecting their reduction and degradation was investigated. A two-stage chamber with graphite felt as cathode and anode was constructed, and 2,4-dichloronitrobenzene (2,4-DCNB) was target pollutant. Result showed that HA increased 36.15% of 2,4-DCNB removal efficiency at pH 5.0 after 4-h cathodic reduction, while at pH 7.0 and 10.0, it showed much less effect. Meanwhile, HA reduced cathodic H₂ and atomic H* production via competing electron with H⁺. Combined with result of HA alleviating inhibition of tert-butyl alcohol on 2,4-DCNB removal, it was supposed that HA shunted dominant pathway of cathodic reduction of 2,4-DCNB from atomic H* to direct electron transfer (DET). This was proved by HA increasing electron transfer efficiency (k) of 2,4-DCNB reduction from 0.50±0.01 to 0.63±0.01, which indicated rate-limiting step of 2,4-DCNB reduction changed from electron transfer (ET) to bond breaking kinetics. HA-mediated DET pathway initially reduced nitro group, followed by dechlorination, while atomic H* pathway was randomly dechlorinated and nitro reduced. The pH significantly affected agglomeration of HA and 2,4-DCNB. Molecular dynamics simulation showed that hydrogen bond and Van der Waals force dominated agglomeration of HA and 2,4-DCNB in acidic condition, while electrostatic force was main driving force in alkaline condition. Less effect of HA on 2,4-DCNB removal efficiency at high pH could be related to its reduced conductivity and weaker molecular interactions with 2,4-DCNB. This study provides comprehensive insight into role and impact of HA in remediation of ClNBs-contaminated sediment and water by (bio)electrochemical technology.
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4. 题目: Bacterially mediated carbon-iron coupling drives differential effects of herbicide enantiomers on soil heavy metal bioavailability

文章编号: N24120609
期刊: Soil Biology and Biochemistry
作者: Ran Wu, Hua Wang, Hanche Xia, Haoyi Zheng, Yaxin Zhu, Lijuan Liu, Shaoting Du
更新时间: 2024-12-06
摘要: In China, heavy metal (HM) contamination of farmland soil is severe. However, the differential effects of herbicides, particularly their chiral configurations, on the bioavailability of soil HMs and their underlying mechanisms remain unclear. Therefore, in this study, we applied different configurations of the typical herbicide Napropamide (NAP) to various types of soils contaminated with composite HMs, including cadmium (Cd), nickel (Ni), lead (Pb), and zinc (Zn), to demonstrate enantiomeric differences in the influence of herbicide isomers on HM bioavailability. Interestingly, we noticed notable enantiomeric variations in the dissolved organic carbon (DOC) levels within these systems. These differences vanished once the systems underwent γ-irradiation sterilization. This suggests a deep-rooted connection between DOC and HMs, facilitated by soil carbon (C)-related bacterial functional groups such as cellulolysis, aromatic compound degradation, and chitinolysis. These functional groups, which are influenced by NAP, play a role in differentially regulating the availability of soil HMs. When NAP isomers coexisted, the soil DOC content increased, as did iron reducing bacteria, leading to the formation of iron (Fe) oxides. The Mantel test results suggested that the DOC-driven C-Fe coupling was a crucial factor in the impact of NAP on soil HM bioavailability. The enantiomeric differences in soil Zn and Ni bioavailability induced by R- and S-NAP were associated with variations in the complexity of soil C- and Fe-related bacterial networks and key species such as Mesorhizobium silamurunense. This study is the first to reveal the underlying mechanism by which herbicide isomers affect soil HMs from a microbially-driven C-Fe coupling perspective, providing a more comprehensive theoretical basis for the scientific application of herbicides and the mitigation of soil HM contamination.
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5. 题目: Organic Matter Composition as a Driver of Soil Bacterial Responses to Pig Carcass Decomposition in a Canadian Continental Climate.

文章编号: N24120608
期刊: Journal of Geophysical Research: Biogeosciences
作者: E L Pecsi, S Forbes, F Guillemette
更新时间: 2024-12-06
摘要: Organic by-products are released into the surrounding soil during the terrestrial decomposition of animal remains. The affected area, known as the Cadaver Decomposition Island (CDI), can undergo biochemical changes that contribute to landscape heterogeneity. Soil bacteria are highly sensitive to labile inputs, but it is unknown how they respond to shifts in dissolved organic matter (DOM) quantity and quality resulting from animal decomposition. We aimed to evaluate the relationship between soil DOM composition and bacterial activity/function in CDIs under a Canadian temperate continental climate. This was studied in soils surrounding adult pig carcasses (n = 3) that were surface deposited within a mixed forested environment (Trois-Rivières, Québec) in June 2019. Using fluorescence spectroscopy and dissolved organic carbon analyses, we detected a pulse of labile protein-like DOM during the summer season (day 55). This was found to be an important driver of heightened soil bacterial respiration, cell abundance and potential carbohydrate metabolism. These bacterial disturbances persisted into the cooler autumn season (day 156) and led to the gradual transformation of labile DOM inputs into microbially sourced humic-like compounds. By the spring (day 324), DOM quantities and bacterial measures almost recovered, but DOM quality remained distinct from surrounding vegetal humic signals. All observed effects were spatially constrained to the topsoil (A-horizon) and within 20 cm laterally from the carcasses. These findings provide valuable insight into CDI organic matter cycling within a cold-climate ecosystem. Repeated CDI studies will however be required to capture the changing dynamics resulting from increasing global temperatures.
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6. 题目: S-enhanced microbial activation of biochars and processed grass fibers for circular horticulture.

文章编号: N24120607
期刊: Science of the Total Environment
作者: Bart Vandecasteele, Jarinda Viaene, Raúl Castejón-Del Pino, Amine Lataf, Ann Cuypers, Dries Vandamme
更新时间: 2024-12-06
摘要: Sulfur-enhanced microbiologically activated biochar and processed grass fibers were tested for suitability as bulk material for horticultural substrates. The potential for use as bulk material was improved when grass fibers with lower biological stability were acidified with elemental sulfur (S). Acidification of the fibers with S was obtained within 2 weeks and resulted in a higher biological stability due to improved decomposition during incubation with S, a change in the microbiome, or inhibition due to high sulfate concentrations, which reduced the decomposition activity. The application of wood-based biochars as bulk or stand-alone material for horticultural substrates is restricted by their high pH and high acid-buffering capacity. Acidification of biochar through microbial activation occurred slowly. The dynamics of lowering pH after S treatment were determined by the acid-buffering capacity of the biochar. In the long term a strong drop in pH was observed in biochars with a low acid-buffering capacity. For the biochars with a high acid-buffering capacity, pH drop was moderate despite a clear decrease in acid-buffering capacity. The microbial activation of biochar was accelerated by adding mineral fertilizer or chitin. Microbial activation of the biochars was confirmed by S mineralization after application of elemental S and by N mineralization from chitin. The acidification of biochars produced from bark or straw-like fiber with elemental S resulted in only small changes in surface properties.
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7. 题目: Occurrence of Imipenem in natural water: Effect of dissolved organic matter and metals.

文章编号: N24120606
期刊: Science of the Total Environment
作者: Pratishtha Khurana, Rama Pulicharla, Satinder Kaur Brar
更新时间: 2024-12-06
摘要: The occurrence of trace antibiotic residues in the environment poses a threat by promoting antibiotic resistance and spreading resistant genes. Recent studies show that these residues interact with metals, forming toxic and persistent antibiotic-metal complexes (AMCs). Investigating the photodegradation of these contaminants in environmental waters is essential to understand their fate and ecotoxicological risk assessment in environmental waters. In this sense, the present work delineates the fate of IMP, a carbapenem antibiotic, in the environmental matrix and studies its interactions with humic acid and metals. The study established that the drug was labile and underwent degradation under light and ambient temperatures. Further, analytical studies with dissolved organic matter (DOM), such as humic acids, established an accelerating effect on antibiotic degradation via indirect photochemical pathways. For instance, for a concentration of 100 mg/L IMP mixed with 20 mg/L HA in volumetric ratios of IMP: HA 1:2, 1:1, and 2:1, the final concentrations of IMP after 24 h were 26.11 mg/L (-73.89 %), 34.44 mg/L (-65.56 %), and 44.22 mg/L (55.78 %), respectively. The higher the humic acid, the faster the degradation of IMP, thereby supporting the photochemical generation of reactive oxygen species (OH•) and subsequent oxidative degeneration of the drug. The interactions with metals, specifically copper, accelerated the degradation kinetics of the drug. The promotion effect was owed to the action of the OH• as the oxidizing agent. Based on the degradation products identified by LC-MS/MS, a scheme of the synergistic action of copper-redox coupling and imipenem, resulting in the oxidative degradation of the drug, was proposed. Understanding the photochemical behavior of antibiotics, and their behavior in the presence of DOM and metal is vital for unravelling their fate and complexity in wastewater.
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8. 题目: Impact of vegetation type on the content and spectroscopic properties of soil organic matter in the subalpine zone of the Bieszczady Mountains (Eastern Carpathians)

文章编号: N24120605
期刊: Plant and Soil
作者: Patrycja Kramarczuk, Łukasz Musielok, Mateusz Stolarczyk, Łukasz Jelonkiewicz, Volodymyr A Nikorych, Wojciech Szymański
更新时间: 2024-12-06
摘要:

Aims

This study aimed to define how vegetation affects the content and chemistry of soil organic matter (SOM) in topsoil (O and A) horizons under blueberry shrubs (Vaccinietum myrtilli) and tall-grass vegetation in the subalpine zone of the Bieszczady Mountains (Eastern Carpathians, SE Poland).

Methods

Topsoil samples (O and A horizons) were collected from ten sites covered with Vaccinium myrtillus L. and at ten sites covered with tall-grass vegetation. Above- and belowground parts of vegetation from each vegetation type were sampled. Total carbon (TC) and nitrogen (TN) content in soil and vegetation samples were determined using an elemental analyzer. SOM chemical properties were determined via Fourier-transform infrared spectroscopy and UV-Vis spectrophotometry. The mineral composition of the A horizons was determined via X-ray diffractometry (XRD).

Results

V. myrtillus L. showed significantly higher TC content and C/N ratio in its aboveground parts compared to tall-grass vegetation, though TN content was significantly lower. FTIR-ATR spectra showed more intense absorption bands for V. myrtillus L. The soil mineral composition was similar across vegetation types. Soils under blueberry shrubs showed significantly higher mean content of organic carbon and TN in the O horizon compared to tall-grass vegetation, with no significant differences in the A horizon.

Conclusions

Topsoil horizons under blueberry shrubs show higher soil organic carbon (SOC) content and C/N ratios than those under tall-grasses. Our results suggest that shrubification may affect carbon concentration in the soil; however, the lack of bulk density measurements prevents the quantification of SOM content and overall carbon sequestration, necessitating further studies.

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9. 题目: Insights into the roles and mechanisms of coconut shell biochar and coke in anaerobic digestion of river snail rice noodle wastewater.

文章编号: N24120604
期刊: Journal of Environmental Management
作者: Qing Wang, Yuchen Wang, Zhu Liang, Fengxiu Ding, Bocai Liang, Shitong Wen, Yuxiang Lu, Chengyuan Su
更新时间: 2024-12-06
摘要: The effects of coconut shell biochar and coke on anaerobic digestion of river snail rice noodle wastewater treatment were assessed, and the microbial community, and methane metabolic pathways were investigated. When the hydraulic retention time was 24 h, the average chemical oxygen demand (COD) removal rates in the reactors with coconut shell biochar and coke were 94.02% and 88.68%, respectively; when the hydraulic retention time was 12 h, the average COD removal rates were 91.32% and 85.47%, respectively. The addition of coconut shell biochar and coke increased the activity of protease in the sludge from 0.45% to 29.31% and from 1.00% to 21.35%, respectively. The addition of coconut shell biochar and coke to the two anaerobic reactors promoted the growth of Euryarchaeota, Proteobacteria, and Chloroflexi. In glycolysis, the key genes glk, pfk and pk were upregulated by 3.15%, 5.22%, and 0.44% in the coconut shell biochar reactor and 8.97%, 1.93% and 3.73% in the coke reactor, respectively, and the keytricarboxylic acid (TCA) cycle genes kor, frd, and mdh were also up-regulated.
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10. 题目: Desertification Reduces Organic Carbon Content and Nutrient Availability in Dryland Soils: Evidence From a Survey in the Amu Darya River Basin

文章编号: N24120603
期刊: Land Degradation & Development
作者: Peng Zhang, Mingzhu He, Jin Wang, Lei Huang, Haotian Yang, Guang Song, Jiecai Zhao, Xinrong Li
更新时间: 2024-12-06
摘要: Desertification degrades drylands, undermining ecosystem services and human well-being as a serious global issue. Assessing desertification impacts on soil organic carbon (SOC) and properties aids in preserving drylands and combating desertification. However, knowledge gaps persist regarding desertification effects on SOC and soil in Central Asia's Amu Darya River Basin. Surveys across ~1000 km in this region showed that desertification decreased SOC by ~52% versus natural vegetation. Desertification also reduced nutrient availability and altered hydrothermal conditions, pH, stoichiometry, and herbaceous richness. In particular, it decreased soil clay and silt while increasing sand content. Regional climate change and prolonged grazing are primary desertification drivers here. These pronounced impacts on soils and vegetation may threaten ecological processes and services. Our findings contribute to dryland restoration efforts and resilience against desertification.
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11. 题目: Synergistic effects of N-containing heterocyclic and Ca ligand structures on the phosphorus adsorption of N/Ca co-doped biochar

文章编号: N24120602
期刊: Journal of Cleaner Production
作者: Zhengming Yang, Zhidong Zou, Muhammad Asif Akhtar, Wenjuan Niu, Luna Ren, Shu Zhang, Nian Liu, Hongliang Cao
更新时间: 2024-12-06
摘要: Using modified biochar for phosphorus removal from water is widely recognized as an eco-friendly and viable alternative to conventional methods. Notably, biochar co-doped with metals and heteroatoms exhibits enhanced active sites and a greater affinity for pollutants compared to biochar doped solely with either metals or heteroatoms. This study involved synthesizing N/Ca single-doped and co-doped biochar through direct and active doping techniques, exploring their structural alterations and adsorption mechanisms. The findings reveal that doping with heteroatoms (N) and metals (Ca) primarily leads to a heterocyclic reconfiguration of the carbon framework. This reconfiguration facilitates the integration of metal ions into the carbon matrix via oxidative coordination. The maximum adsorption capacity of the Ca/N co-doped biochar for phosphorus was measured to be 145.47 mg/g. The interaction between N-containing heterocycles and Ca ligand structures on the biochar surface significantly boosts phosphorus removal, achieving synergistic adsorption effects (1+1>2). Key mechanisms driving this efficient adsorption include pore filling, hydrogen bonding, anion-π interactions, ligand exchange, and chemical precipitation. These insights provide a comprehensive understanding of the structural modifications necessary for optimizing phosphorus adsorption in biochar.
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12. 题目: Design optimization of bimetal-modified biochar for enhanced phosphate removal performance in livestock wastewater using machine learning

文章编号: N24120601
期刊: Bioresource Technology
作者: Weilin Fu, Xia Yao, Lisheng Zhang, Jien Zhou, Xueyan Zhang, Tian Yuan, Shiyu Lv, Pu Yang, Kerong Fu, Yingqiu Huo, Feng Wang
更新时间: 2024-12-06
摘要: Mg-modified biochar shows high adsorption performance under weakly acidic and neutral water conditions. However, its phosphate removal efficiency markedly decreases in naturally alkaline wastewater, such as that released in livestock farming (anaerobic wastewater with a high phosphate concentration). This research employed six machine learning models to predict and optimize the phosphate removal performance of bimetal-modified biochar (i.e., Mg–Ca/Al/Fe/La) to develop material design strategies suitable for achieving high removal efficiency in alkaline wastewater. Random forest, gradient boosting regressor, and extreme gradient boosting models achieved high prediction accuracy (R² > 0.98). Model predictions and experimental validations indicated that Mg–Ca-modified biochar still maintained high adsorption capacity under acidic conditions and could effectively realize phosphate adsorption under alkaline conditions, with a removal rate of 99.33 %. Overall, this research focuses on material performance optimization using machine learning, offering insights and methods for developing biochar materials for practical water-treatment applications.
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