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1. 题目: Graphite-N reinforced sludge biochar electrode: A experimental and DFT theoretical analysis of efficient evolution and in-situ utilization of H2O2
文章编号: N24052611
期刊: Environmental Pollution
作者: Chenxi Li, Xiaojie Qiu, Huilin Wan, Zehao Ma, Ruotong Jin, Yingxin Zhao
更新时间: 2024-05-26
摘要: Rational reuse of municipal sludge to produce electro-Fenton electrode can not only save resources, but also produce superior peroxide and degradation pollutants simultaneously. Herein, a novel electro-Fenton electrode derived from sludge biochar loaded on Ni foam (SBC@Ni) was constructed via high temperature pyrolysis and chemical coating for efficient H2O2 evolution and pollutant degradation. Systematic experiments and density functional theory calculations (DFT calculation) explained that the production of graphite C and graphite N during high-temperature pyrolysis of municipal sludge can greatly enhance the oxygen reduction reaction of SBC@Ni electrode and promote the evolution of H2O2. And the hybrid heterojunctions, such as FeP, also played a key role in electrocatalytic processes. Notably, the electrode still exhibited excellent performance after 1000 linear scans and 12 h of continuous current stimulation, which demonstrated the excellent stability of the electrode. Moreover, SBC@Ni electrode can not only effectively oxidize 4-chlorophenol through the electro-Fenton effect, but also fully mineralize organic matter, indicating promising environmental application. The free radical quenching experiment also revealed that the ·OH is the main active species for 4-CP degradation in SBC@Ni electro-Fenton system.

2. 题目: Nitrogen limitation in eucalypt roots: a cascading influence on the mobilization of soil organic matter
文章编号: N24052610
期刊: Biology and Fertility of Soils
作者: Luis Carlos Colocho Hurtarte, Ivan Francisco Souza, Rodrigo Teixeira Ávila, Luís Fernando J Almeida, Gabriela Soares, Leonardus Vergütz, Ivo Ribeiro Silva
更新时间: 2024-05-26
摘要:

Emerging scientific evidence has shown that root exudates may trigger the mobilization of soil organic matter (SOM), particularly under nutrient limitation. However, the role of changes in root morphology, metabolism, exudation, and their impact on rhizospheric properties and SOM remain poorly known. To address this issue, we conducted a rhizobox experiment for 50 days in which pre-grown eucalypt plants (120 days-old) were supplied with nutrient solutions providing either limited (0.0 mg L− 1) or normal N supply (196.0 mg L− 1). After 48 days, we used a 13CO2 pulse labeling to track the impact of N limitation on C translocation to roots and soil respiration. After the 50th day, we assessed root morphology and metabolism, rhizospheric pH, mineral crystallinity, C and N contents, and the molecular composition of SOM. Under N limitation, eucalypt plants showed reduced photosynthesis, increased their root-to-shoot ratio and root branching, with organic acids prevailing among root metabolites. Overall, N-limited eucalypt plants led to a cascading of changes in the rhizosphere: increased concentrations of recently fixed 13C-CO2, citrate, and N-bearing compounds, whereas soil pH and Fe-bound SOM decreased. These results were not followed by significant changes in microbial biomass, neither fungi: bacteria nor Gram-positive: Gram-negative ratios. Our results show that under N limitation, eucalypt roots exhibited a cascade of morpho-physiological adjustments that ultimately increased the mobilization of some SOM pools. Therefore, the combined impacts of those root morpho-physiological traits on the mobilization of SOM may reduce the overall soil C sink of eucalypt forests under N limitation.

3. 题目: Boosting peroxymonosulfate activation with a composite of highly dispersed FeS2 nanoparticles anchored on N-doped biochar for efficient tetracycline degradation
文章编号: N24052609
期刊: Journal of Environmental Chemical Engineering
作者: Wenqi Bao, Qian Tang, Yixin Fan, Yin Zhu, Yonghui Gao, Yuwei Sun, Hao Liu
更新时间: 2024-05-26
摘要: The rational design of inexpensive peroxymonosulfate (PMS) activators with high efficiencies is still in high demand. Herein, a composite with highly dispersed FeS anchored on nitrogen-doped biochar (FeS@NBC) was prepared via a hydrothermal process and used for PMS activation to degrade the pollutant tetracycline (TC). Benefiting from in situ growth of FeS on the NBC surface, FeS@NBC alleviated the side effects caused by FeS agglomeration, and the synergistic catalytic effect of the FeS nanoparticles and N-doped biochar resulted in excellent performance. The optimal FeS@NBC/PMS system could degrade 87.6 % of TC within 10 min, and it exhibited adaptability to pH changes and the presence of common inorganic anions. A comprehensive study involving radical scavenging experiments, electron paramagnetic resonance (EPR) spectroscopy, electrochemical tests and XPS analyses revealed that the singlet oxygen (O) and hydroxyl radical (OH) were the dominant reactive oxygen species (ROS), the sulfate radical (SO) and electron transfer were involved in the TC degradation process. Moreover, three degradation pathways were indicated by LC−MS detection, and the toxicities of the degradation intermediates were predicted and evaluated. Finally, FeS@NBC showed excellent reusability and stability after five cycles of TC degradation. This work provides a reference for designing efficient catalysts that can be combined with metal sulfides and biochar for efficient PMS activation.

4. 题目: Experimental and Theoretical Investigation of Olive Mill Solid Waste Biochar for Vanillic Acid Adsorption Using DFT/B3LYP Analysis
文章编号: N24052608
期刊: Water, Air, & Soil Pollution
作者: Imad Rabichi, Chaima Sekkouri, Fatima Ezzahra Yaacoubi, Karima Ennaciri, Zaina Izghri, Taoufiq Bouzid, Loubna El Fels, Abdelaziz Baçaoui, Abdelrani Yaacoubi
更新时间: 2024-05-26
摘要:

This study discusses the preparation of biochar (BC) from Olive Mill Solid Waste (OMSW) on a semi-industrial scale, which can be utilized as an adsorbent to recover or remove phenolic compounds (vanillic acid). The preparation was carried out under optimized laboratory conditions (carbonization temperature, residence time, heating rate, atmosphere…). The obtained material was characterized using various techniques (BET surface area, Elementary analyses, proximate analyses, Organic Carbon). Different models were used to suit the adsorption isotherms (Langmuir, Freunlich, and Temkin…) and kinetics (pseudo-first-order, pseudo-second-order, and intra-particle diffusion…) of single phenolic acid. The experimental results correlate well with the pseudo-second-order and Langmuir models, with a maximum adsorption capacity (qm = 57.47 mg.g−1) and a correlation coefficient of R2 = 0.999. To elucidate the activated sites on vanillic acid (VA) and the adsorption mechanism, Density Functional Theory (DFT) employing the B3LYP/6-311G basis set was utilized. Lower ΔEgap values are linked to greater inhibition efficiencies. In this context, the calculations indicate that vanillic acid, with its significantly higher EHOMO value of -1.3662, possesses a superior ability to donate electrons to the BC surface. Additionally, there is a concurrence between the experimental outcomes and the findings of this computational modeling.

Graphical

5. 题目: Mechanistic insights of efficient aromatic organic compounds oxidation using biochar derived from coking wastewater sludge
文章编号: N24052607
期刊: Separation and Purification Technology
作者: Li Yu, Xiaohong Yu, Yun Duan, Weiyang Xue, Liang Zhang, Li Wang, Huangzhao Wei
更新时间: 2024-05-26
摘要: Coking wastewater sludge possessed potential environmental hazards and pyrolysis was a desirable approach which could converted it into one functional carbonous material. The sludge-based biochar (SC-N3) originated from the feedstock of sludge from the regenerated water treatment had various iron-containing species and exhibited the effective catalytic ability. Compared with the degradation of the four pollutants (i.e., phenol, pyridine, quinoline and indole) alone, the mixed of the four pollutants in simulated coking wastewater exhibited a prominent different degradation trend, where the removal rates of indole and quinoline were enhanced from 45% and 30% to 98.9% and 82.3%, respectively. The quinone intermediates from phenol degradation, played a critical role in enhancing the removal rates of indole and quinoline as the electron transfer medium. Both the free radical pathway dominated by •OH and non-radical pathway with O play the main role in indole degradation, while •OH was the main factor in the catalytic degradation of phenol, quinoline and pyridine. By analysis the intermediates elucidated by Fourier transform ion cyclotron resonance mass spectrometry and three-dimensional excitation-emission matrix fluorescence spectra, the degradation molecular characteristics and pathways of the four pollutants in simulated coking wastewater were deciphered. The findings indicated that the catalyst SC-N3 prepared from the coking wastewater sludge presented unique catalytic properties and possessed a promising application in the degradation of refractory wastewater.

6. 题目: Effect of biochar on microplastics penetration treatment within soil porous medium under the wetting-drying cycles and optimisation of soil-biochar mixing format
文章编号: N24052606
期刊: Science of the Total Environment
作者: Yixin Li, Benny Haotian Ding, Xueyu Geng
更新时间: 2024-05-26
摘要: Plant-based biochar was demonstrated promising capability in adsorbing microplastic particles (MPs) within soil porous mediums. However, biochar's function in mitigating MPs' vertical penetration during wetting-drying cycles, typical of seasonal precipitation and evaporation, remains uncertain. Furthermore, few studies have investigated the structures of how biochar combines with soil. This study conducted column tests to assess the MPs retention capabilities of soil-biochar porous media under saturated and wetting-drying conditions. The water retention and hydrophilic properties were investigated to elucidate the impact of wetting-drying cycles. Additionally, different biochar-soil structures were compared to optimise the structural design. Without biochar, wetting-drying cycles resulted in 8.74 % more MPs escaping from samples. However, incorporating 15 % biochar led to only around 2 % more MPs in effluent. Biochar significantly enhanced soil's MP absorption capacity and mitigated the negative effects of wetting-drying cycles. Biochar's alveolate morphology provides ample adsorption sites and creates complex flow paths. The hydrophilic groups of biochar and capillarity by micropores facilitated slower water release during drying, preventing crack propagation and flush on MP particles. This effect was more pronounced with higher biochar content and lower porosity. Moreover, layer structure was found to improve MPs removal, benefiting the long-term performance and management of the biochar functional layer.

7. 题目: New insights into algal-bacterial sludge granulation based on the tightly-bound extracellular polymeric substances regulation in response to N-Methylpyrrolidone
文章编号: N24052605
期刊: Water Research
作者: Xiaoyu Zhang, Dan Chen, Na Jiang, Xinying Hou, Yan Li, Yixuan Wang, Jinyou Shen
更新时间: 2024-05-26
摘要: Algal-bacterial granular sludge (ABGS) system is promising in wastewater treatment for its potential in energy-neutrality and carbon-neutrality. However, traditional cultivation of ABGS poses significant challenges attributable to its long start-up period and high energy consumption. Extracellular polymeric substances (EPS), which could be stimulated as a self-defense strategy in cells under toxic contaminants stress, has been considered to contribute to the ABGS granulation process. In this study, photogranulation of ABGS by EPS regulation in response to varying loading rates of N-Methylpyrrolidone (NMP) was investigated for the first time. The results indicated the formation of ABGS with a maximum average diameter of ∼3.3 mm and an exceptionally low SVI value of 67 ± 2 mL g under an NMP loading rate of 125 mg L d, thereby demonstrating outstanding settleability. Besides, almost complete removal of 300 mg L NMP could be achieved at hydraulic retention time of 48 h, accompanied by chemical oxygen demand (COD) and total nitrogen (TN) removal efficiencies higher than 90 % and 70 %, respectively. Moreover, possible degradation pathway and metabolism mechanism in the ABGS system for enhanced removal of NMP and nitrogen were proposed. In this ABGS system, the mycelium with network structure constituted by filamentous microorganisms was a prerequisite for photogranulation, instead of necessarily leading to granulation. Stress of 100–150 mg L d NMP loading rate stimulated tightly-bound EPS (TB-EPS) variation, resulting in rapid photogranulation. The crucial role of TB-EPS was revealed with the involved mechanisms being clarified. This study provides a novel insight into ABGS development based on the TB-EPS regulation by NMP, which is significant for achieving the manipulation of photogranules.

8. 题目: Fungal decomposition and transformation of molecular and colloidal fractions of dissolved organic matter extracted from boreal forest soil
文章编号: N24052604
期刊: Soil Biology and Biochemistry
作者: Luigi Gentile, Dimitrios Floudas, Ulf Olsson, Per Persson, Anders Tunlid
更新时间: 2024-05-26
摘要: Dissolved organic matter (DOM) plays a central role in soil carbon (C) dynamics, serving as both a substrate for microbial decomposers and a source of material stabilised via physical protection in molecular aggregates and associations with mineral particles. It is well established that soil microorganisms play a key role in mineral-associated C aggregates; however, their impacts on molecular aggregates is not clearly understood. Here, we examined the ability of an ectomycorrhizal fungus () and a saprotrophic fungus (a strain of ), two major functional groups of fungal decomposers in forest ecosystems, to decompose and process the molecular and colloidal size fractions of DOM. DOM was extracted by water from boreal forest soil, and the chemical composition and colloidal properties were followed over 11 days using nuclear magnetic resonance (NMR) spectroscopy and small-angle light and X-ray scattering techniques. Both fungi decompose various organic compounds into their molecular fractions in the presence of an energy source (i.e. glucose). The decomposition rate was significantly higher for than for . When glucose was depleted, continued to decompose more complex carbohydrates, whereas the decomposition activity of almost stopped. A large proportion of the C in the DOM was found in organic colloids. At later stages, but not , significantly affected the colloids by promoting the formation of larger aggregates. Thus, saprotrophic fungi activity can significantly influence the colloidal properties of DOM. Our results support the view that ectomycorrhizal fungi decompose some of the soil organic C however, their overall capacity for DOM decomposition and transformation is significantly lower than that of saprotrophic fungi.

9. 题目: Reduced belowground allocation of freshly assimilated C contributes to negative plant-soil feedback in successive winter wheat rotations
文章编号: N24052603
期刊: Plant and Soil
作者: Nikolaos Kaloterakis, Sirgit Kummer, Samuel Le Gall, Youri Rothfuss, Rüdiger Reichel, Nicolas Brüggemann
更新时间: 2024-05-26
摘要:

Aims

Successive winter wheat (WW) rotations are associated with yield reduction, often attributed to the unfavorable soil microbes that persist in the soil through plant residues. How rotational positions of WW affect the allocation of freshly assimilated carbon (C), an energy source for soil microbes, above and belowground remains largely unknown.

Methods

A 13CO2 pulse labeling rhizotron experiment was conducted in the greenhouse to study freshly fixed C allocation patterns. WW was grown in soil after oilseed rape (W1), after one season of WW (W2), and after three successive seasons of WW (W4). We used an automatic manifold system to measure excess 13C of soil respiration at six depths and five different dates. Excess 13C was also measured in dissolved organic C (DOC), microbial and plant biomass pools.

Results

There was a strong yield decline in successive WW rotations accompanied by distinct changes in root growth. Higher excess 13C of soil respiration was measured in W1 compared to W4, especially in the topsoil during at later growth stages. Higher excess 13C of the DOC and the microbial biomass was also traced in W1 and W4 compared to W2. Less 13C was taken up by successive WW rotations.

Conclusions

Our study demonstrates a mechanism through which the rotational position of WW affects the allocation of freshly assimilated C above and belowground. WW after oilseed rape sustains belowground allocation of freshly assimilated C for a longer time than successively grown WW and incorporates more of this C to its biomass.

10. 题目: Investigation of elemental mercury removal performance and mechanism of rice straw biochars from a fluidized bed pyrolysis system impregnated by NH4Br
文章编号: N24052602
期刊: Chemical Engineering Journal
作者: Lingqin Liu, Guo Chen, Huajun Hu, Yaji Huang
更新时间: 2024-05-26
摘要: To remove Hg from flue gas efficiently and economically, the rice straw biochars prepared in a fluidized bed pyrolysis system and then modified with NHBr are employed as the sorbents. The mercury adsorption capacity of Br-modified biochar (1786.85 μg/g) is superior to that of activated carbon (207 μg/g), which indicates Br-modified rice straw biochar sorbent displays higher Hg adsorption efficiency and can replace high-cost activated carbon. The sorbents are characterized by Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The effects of pyrolysis temperature, pyrolysis atmosphere, reaction temperature, the components of flue gas (O, NO and SO) on mercury removal efficiency, kinetics, thermodynamics and mercury removal mechanism are investigated. The results indicate elevating pyrolysis temperature and oxygen content significantly enhance the Hg removal efficiency. The Hg adsorption process is better fitted by pseudo-second-order kinetic model and proves a spontaneous endothermic process. The presence of O and NO in flue gas enhances Hg adsorption, while the presence of SO restrains it. After Hg adsorption, the peak area ratio of C=O (288.5 eV) and C-Br (69.1 eV) by Br-modified rice straw biochars produced under 8 %O and 500 °C atmosphere decreases from 17.03 % and 70.14 % to 6.55 % and 50.50 %, respectively, while that of Br (68.1 eV) increases from 29.86 % to 48.50 %, indicating the surface O* and Br* species are responsible for Hg removal, and the products are mainly HgO and HgBr. This work provides a kind of cost-effective Hg removal sorbent and explores the mechanism of Hg removal by Br-modified biochars.

11. 题目: ZnCl2 and thiourea co-modified biochar for effectively removing quinclorac in water and soil: Mechanism and alleviating its phytotoxicity on tobacco plants
文章编号: N24052601
期刊: Separation and Purification Technology
作者: Yu Ouyang, Wei Zhu, Xuemei Yao, Can Ye, Bowen Lei, Xing Rong, Jie Zheng, Xiangyun Liu, Jiarong Wu, Xiangying Liu, Chunxia Ding
更新时间: 2024-05-26
摘要: The overuse of herbicide may cause pollution in water and soil environment, affecting the growth of crops. And how to reduce herbicide residues has aroused extensive attention. In this work, a novel modified biochar (Zn/SN-BC) was prepared with reed straw as raw material, ZnCl and thiourea as modifiers to remove quinclorac (QC) residues in water and soil. Compared with primitive biochar, Zn/SN-BC, benefiting from higher specific surface area (766.5 m·g), improved pore characteristics and abundant reactive sites (−C = O, −COOR, −C-N, −C-S, ZnS, etc), showed excellent adsorption capacity towards QC (235.9 mg·g), which was much higher than others reported before. According to the characterization results, it was revealed that Zn/SN-BC adsorbed QC through pore filling, hydrogen bonding, π-π conjunction, electrostatic attractions and other chemical interactions. The column leaching and pot experiments demonstrated that Zn/SN-BC could reduce QC leaching and bioavailability in soil, and effectively alleviate its phytotoxicity on tobacco plants. This study gives a new insight into the application of biochar-based materials for the treatment of herbicide residues in agricultural environments.

12. 题目: Development of unique soil organic carbon stability index under influence of integrated nutrient management in four major soil orders of India
文章编号: N24052520
期刊: Journal of Environmental Management
作者: Rajendra Kumar Yadav, Tapan Jyoti Purakayastha, Debarati Bhaduri, Ruma Das, Saptaparnee Dey, Suvana Sukumaran, Sohan Singh Walia, Rohitashav Singh, Virender Kumar Shukla, Madan Singh Yadava, Natesan Ravisankar
更新时间: 2024-05-25
摘要: Stability of soil organic carbon (SOC) is pre-requisite for stabilization of C leading to long-term C sequestration. However, development of a comprehensive metric of SOC stability is a major challenge. The objectives for the study were to develop novel SOC stability indices by encompassing physical, chemical, and biochemical SOC stability parameters and identifying the most important indicators from a Mollisol, an Inceptisol, a Vertisol, and an Alfisol under long-term manuring and fertilization. The treatments were control, 100%NPK, 50% NPK+ 50% N through either farmyard manure, cereal residue, or green manure. SOC stability indicators were selected, transformed and integrated into unique SOC stability indices via conceptual framework and principal component analysis. Principal component analysis identified Al-macroaggregate, humic acid C-microaggregate, microaggregate-C, particulate organic matter-C-macroaggregate and polyphenol-microaggregate as the important SOC stability indicators. The principal component analysis -based SOC stability index varied from 0.2 to 0.9, 0.1 to 0.5, 0.2 to 0.6, 0.1 to 0.5 for Mollisol, Inceptisol, Vertisol and Alfisol, respectively. The SOC-stability index derived from conceptual framework and principal component analysis significantly lined up well with one another, although NaOCl-Res-C showed a high correlation with both conceptual framework (r = 0.8) and principal component analysis-based (r = 0.7) SOC stability indexes, suggesting that both methods might be used to quickly assess SOC stability in four soil orders. Overall, 50%NPK+50%N by farmyard manure or green manure emerged as the most effective management practices for enhancing stability of SOC in Mollisol, Inceptisol, Vertisol, and Alfisol of India which might act as major C sink in rice-wheat and maize-wheat cropping systems. The other aspect of C sequestration is to enhance agricultural productivity without depending much on expensive chemical fertilizers. The model yardstick thus developed for assessing SOC stability might be useful to other systems as well.

13. 题目: Prediction of nitrogen, active carbon, and organic carbon‐to‐clay ratio in agricultural soils by in‐situ spectroscopy
文章编号: N24052519
期刊: European Journal of Soil Science
作者: Konrad Metzger, Luca Bragazza
更新时间: 2024-05-25
摘要: Visible and near‐infrared (vis–NIR) spectroscopy is a promising technology for the analysis of different soil quality parameters. In this study, we used in‐situ vis–NIR spectroscopy in association with partial least squares regression to predict the total and the mineral (nitrate + ammonium) nitrogen content, the permanganate oxidizable carbon (POXC), as well as the ratio of soil organic carbon‐to‐clay content in different agricultural soils in Switzerland. These parameters can indeed be used as indicators of soil quality in response to agronomic practices. To this goal, a total number of 134 soil samples were used for carbon‐, total nitrogen‐ and clay‐related parameters, whereas 69 soil samples were used for the mineral nitrogen‐related parameters. We found that the partial least squares regression model can successfully predict the total nitrogen and the POXC content as well as the ratio of soil organic carbon‐to‐clay content (ratio of performance to interquartile range, RPIQ > 2.62, R2 > 0.73, Lin's concordance correlation coefficient > 0.83). As concerns the mineral nitrogen, it was not possible to successfully predict this parameter by vis–NIR spectroscopy. By demonstrating the possibility to reliably predict POXC content and the soil organic carbon‐to‐clay ratio, we show that vis–NIR can be also used to analyse soil parameters associated with both the quality of organic carbon and the structural quality of agricultural soils.

14. 题目: Quantifying aboveground biomass, soil organic carbon and erosion with a detailed crop map and PESERA model in the Yangtze River Basin
文章编号: N24052518
期刊: European Journal of Soil Science
作者: Jichen Zhou, Jantienne Baartman, Yinan Ning, João Pedro Nunes, Hedwig van Delden, Roel Vanhout, Xinping Chen, Coen Ritsema, Lihua Ma, Xuejun Liu
更新时间: 2024-05-25
摘要: Soil erosion represents a primary threat to soil systems with adverse implications for ecosystem services, crop production, potable water and carbon storage. While numerous studies have quantified the spatial distribution of aboveground Biomass (AGB), soil erosion and soil organic carbon (SOC) in the Yangtze River Basin (YRB), limited attention has been given to assessing the contributions of different land use types and especially crop types to AGB, soil erosion and SOC. In most studies, cropland is taken as a land use class, while detailed crop types and rotation patterns, and their effect on soil erosion and SOC, vary significantly. In this study, we used the Metronamica model to generate a detailed crop rotation and distribution map across the YRB and subsequently employed the Pan‐European Soil Erosion Risk Assessment (PESERA) model to simulate the spatial distribution of AGB, soil erosion and SOC on a monthly basis. PESERA model simulations indicate an average soil erosion rate across the entire YRB of 7.7 ton/ha/yr, with erosion hotspots concentrated in the Sichuan Basin and the central‐southern regions. The southwestern region and western Sichuan show elevated levels of AGB and SOC, while the eastern plains display lower levels. Erosion rates are lowest in areas designated as artificial land, pasture and grassland, whereas croplands and fruit tree plantations experience the highest erosion rates. In terms of crop types, the highest erosion rates and lowest AGB are observed under fallow and potato cultivation, while the lowest erosion rates and highest AGB are found in rice‐wheat rotation fields. To the best of our knowledge, this is the first study taking detailed crop types and patterns into account while evaluating their effect at a relatively large scale (i.e., YRB). These findings can help to develop sustainable soil management and (cropping) conservation strategies.

15. 题目: Dynamic performance of combined biochar from co-pyrolysis of pig manure with invasive weed: Effect of natural aging on Pb and As mobilization in polluted mining soil
文章编号: N24052517
期刊: Science of the Total Environment
作者: Jing Qiu, Marcella Fernandes de Souza, Xiaolin Wang, Yassine Chafik, Domenico Morabito, Frederik Ronsse, Yong Sik Ok, Erik Meers
更新时间: 2024-05-25
摘要: Due to the natural biochar aging, the improvement of soil quality and immobilization of soil pollutants achieved by biochar may change; understanding the dynamic evolution of the in situ performance of biochar in these roles is essential to discuss the long-term sustainability of biochar remediation. Therefore, in this study, combined biochar from co-pyrolysis of pig manure and invasive Japanese knotweed – P1J1, as well as pure pig manure – PM – and pure Japanese knotweed – JK – derived biochar were applied to investigate their remediation performance in a high As- and Pb-polluted soil with prolonged incubation periods (up to 360 days). Biochar application, especially P1J1 and PM, initially promoted soil pH, dissolved organic carbon, and EC, but the improvements were not constant through time. The JK-treated soil exhibited the highest increase of soil organic matter (OM), followed by P1J1 and then PM, and OM did not change with aging. Biochar, especially P1J1, was a comprehensive nutrient source of Ca, K, Mg, and P to improve soil fertility. However, while soluble cationic Ca, K, and Mg increased with time, anionic P decreased over time, indicating that continuous P availability might not be guaranteed with the aging process. The total microorganism content declined with time; adding biochars slowed down this tendency, which was more remarkable at the later incubation stage. Biochar significantly impeded soil Pb mobility but mobilized soil As, especially in PM- and P1J1-treated soils. However, mobilized As gradually re-fixed in the long run; meanwhile, the excellent Pb immobilization achieved by biochars was slightly reduced with time. The findings of this study offer fresh insights into the alterations in metal(loid)s mobility over an extended duration, suggesting that the potential mobilization risk of As is reduced while Pb mobility slightly increases over time.

16. 题目: Accelerated removal of organic pollutants by biochar-based iron carbon granule-activated periodate in chloride-containing water: The role of active chlorine
文章编号: N24052516
期刊: Separation and Purification Technology
作者: Xiang Li, Gaili Zhang, Mengke Zhang, Qingge Cui, Wei Zou, Minghua Zhou
更新时间: 2024-05-25
摘要: Ubiquitous in water environments, the chloride ion (Cl) can impact the decontamination capacity of an oxidation system. However, minimal studies are available on its effects in periodate (PI)-based advanced oxidation processes. In this study, a novel biochar-based iron-carbon (FeBC) granule was synthesized to activate PI and remove organic pollutants from water containing Cl. The FeBC/PI/Cl system (FeBC: 0.5 g/L; PI: 0.5 mM; AO7: 20 mg/L; NaCl: 50 mM) exhibited excellent performance on various organic pollutants, with > 85 % of Acid Orange (AO7) removal over a pH range of 3–10. Within 20 min after the tenth run, approximately 80 % of AO7 was removed. Inorganic ions and natural organic matter had a negligible effect on AO7 removal. Characterization results confirmed that the presence of Cl enhanced Fe corrosion, thereby improving PI activation efficiency for removing AO7. Electron paramagnetic resonance spectroscopy and active species trapping experiments verified that radicals (OH and O) and nonradical (O, Fe(IV), and electron transfer) oxidation processes participated in the FeBC/PI system. Moreover, the presence of Cl accelerated OH, O, O, and Fe(IV) formation and generated active chlorine, such as HOCl. The main pathways involved in the generation of multiple reactive species were evaluated. AO7 degradation pathways were proposed, and numerous intermediates exhibited decreased toxicity. These findings provide new insights for the decontamination of organic contaminants in water containing Cl.

17. 题目: Theoretical insight into NO formation and reduction at biochar N-sites: Influence of different oxygen-containing functional groups
文章编号: N24052515
期刊: Journal of Environmental Chemical Engineering
作者: Ji Liu, Yuan-gu Xia, Huai-de Sun, Bin Hu, Yang-wen Wu, Ji-hong Li, Qiang Lu
更新时间: 2024-05-25
摘要: Biochar is a cost-efficient and promising porous carbonaceous material for the efficient removal of flue gas NO. The N-site located at the edge of biochar can be a crucial gateway for NO reduction to N or for NO formation by oxidation, which can be significantly affected by the oxygen-containing functional groups (OFGs) on the biochar edge. However, the roles of different OFGs in N-site-involved reactions remain elusive. Based on the biochar characterization results, reasonable theoretical models of biochar with different N-sites and OFGs were constructed. Subsequently, the effects of distinct OFGs on the interaction between NO and N-sites as well as the NO liberation from N-sites were elucidated, by employing density functional theory (DFT) and electronic structure analysis. The results reveal that all OFGs, encompassing -CHO, -COOH, and -OH, manifest their roles through the direct inherent electrostatic properties of O/H in OFGs (O*/H*) or altering the reactivity of edge atoms indirectly. For pyridinic nitrogen (N-6) at the zigzag edge, unsaturated (-CHO, -COOH)/saturated (-OH) OFGs inhibit/enhance NO reduction with N-6 by electrostatic properties of O*/H*, and all OFGs inhibit NO generation from N-6. Besides, all OFGs enhance the NO reduction with pyrrolic nitrogen (N-5) at the armchair edge while inhibiting the release of NO, by influencing the edge activity. The present study gives a mechanism insight into the roles of distinct OFGs in reactions involving biochar N-sites.

18. 题目: Spectral characterization, degradation behavior, quenching, and semi-quantification of fluoroquinolone antibiotics in the antibiotic-humic mixture using fluorescence spectroscopy
文章编号: N24052514
期刊: Science of the Total Environment
作者: Nahin Mostofa Niloy, Fahmida Parvin, Shafi M Tareq
更新时间: 2024-05-25
摘要: Antibiotics, one of the significant emerging contaminants, are intensifying their continual spread out into the environment and affecting human health and the ecosystem in the developing country Bangladesh. This study characterizes widely used fluoroquinolone (FQ) antibiotics, formulates the method to spectrally distinguish them from ubiquitous, and important reactive, adsorbent, and altering catalytic macromolecule humic substances (HS), and further quantifies them using fluorescence spectroscopy. The presence of identical fluorophore at Excitation/Emission = 225–230/285–295 nm wavelength, possession of fluorescence spectra at short emission wavelength (<350 nm) during 275 nm excitation, different emission maxima, and various fluorescing components in antibiotics identified through three-dimensional excitation-emission matrix (EEM) and parallel factor analysis (PARAFAC) models distinguished them from the humic substance as well as from each other. Stern-Volmer equation and its modified version were applied to identify quenching and binding capability, and fluorescence intensity quenching rate of antibiotics and humic in their mixture. Unlike poor and inconsistent quenching mechanisms of humic, FQ antibiotics reduced HS intensity throughout the entire photo-irradiation experiment affirming the functioning of the stable quenching methods. Static quenching of fluorophores was identified from the redshift of excited wavelength on the electronic ground state. Temperature differences during daylight and dark conditions played contrasting roles during the fluorescence quenching of FQ. Unique spectral response at emission wavelength < 350 nm during 275 nm excitation in FQ was considered as its least intensity in the antibiotic-humic mixture and was also used to formulate distinct spectral pattern of each FQ antibiotic. The study also identified the traces of FQ antibiotics with various intensities at different lakes in Bangladesh.

19. 题目: Preparation of magnetic biochar from macadamia nutshell pretreated by FeCl3-assisted mechanochemical activation for adsorption of heavy metals
文章编号: N24052513
期刊: Journal of Environmental Chemical Engineering
作者: Jierong Zhou, Yanjin He, Likui Huang, Aixian Xu, Yi Zhao, Junzheng Wang, Guixiang He, Songlin Fan, Zuqiang Huang
更新时间: 2024-05-25
摘要: Magnetic biochar is an inexpensive and easily recoverable adsorbent material for heavy metals. This study involved the preparation of magnetic biochar (MCA-BC) by solvent-free pyrolysis of macadamia nutshell pretreated with FeCl-assisted mechanochemical activation (MCA) to remove Cu and Pb. MCA-BC exhibited a serrated lamellar structure with abundant functional groups, which has outstanding adsorption performance for Cu and Pb and can be recycled 5 times with a 70% removal rate. Langmuir isotherms models ( = 339.78 and 200.44 mg⋅g for Cu and Pb, respectively) and pseudo-second-order kinetics models were aptly used for the adsorption process. The adsorption mechanisms included pore filling, electrostatic adsorption, complexation and coordination reactions. This study has provided a novel synthetic pathway for the FeCl-assisted MCA coupled with pyrolysis to prepare magnetic macadamia nutshell biochar, which has great potential for treating heavy metal wastewater.

20. 题目: When biochar meets iron mineral: An opportunity to achieve enhanced performance in treating toxic metal(loid)s and refractory organics
文章编号: N24052512
期刊: Separation and Purification Technology
作者: Haiyan Zhong, Zhenxu Feng, Yixuan Luo, Yuling Zheng, Zhangxiong Luo, Tianwei Peng, Chen Yan, Biao Song
更新时间: 2024-05-25
摘要: The application of biochar and iron mineral composites (BIMCs) in environmental remediation has demonstrated significant potential and value in recent years. These composites effectively integrate biochar and iron minerals through various processes, achieving synergistic effects between the two components and substantially enhancing the performance in environmental remediation. This review aims to give a comprehensive overview of the synthesis methods, applications, synergetic mechanisms, and research progress of BIMCs in treating toxic metal(loid)s and refractory organics. The effective combination of biochar and iron minerals (rather than simple physical mixing) is a prerequisite for harnessing their synergistic effects. The primary methods employed in the production of BIMCs include mixing-pyrolysis, precipitation, ball-milling, and biological reduction, and the selection of preparation method mainly depends on the iron mineral component and the research purpose. The utilization of BIMCs in environmental remediation is extensively discussed, encompassing their applications as adsorbents, soil amendments, Fenton oxidation catalysts, and persulfate oxidation catalysts. In addition, the prospects of BIMCs in practical engineering applications are discussed, and the challenges of current research are analyzed. The future research can be further in-depth in the aspects of efficient preparation methods, practical engineering applications, performance regulation rules, and synergistic mechanism of BIMCs. The BIMCs have broad application prospects in the field of environmental remediation, and are expected to provide more efficient, economical, and environmentally friendly solutions to treating toxic metal(loid)s and refractory organics.

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