24年12月22日文献情报（15篇）

24年12月22日文献情报

1. 题目: Reclamation leads to loss of soil organic carbon and molecular complexity: Evidence from natural to reclaimed wetlands

文章编号: N24122215
期刊: Soil and Tillage Research
作者: Xiaolei Yin, Xiaofei Yu, Lei Qin, Ming Jiang, Xianguo Lu, Yuanchun Zou
更新时间: 2024-12-22
摘要: The molecular diversity of soil organic matter (SOM) is recognised as a key factor influencing soil organic carbon (SOC) accumulation, and the molecular diversity of SOM may change as SOC content changes during land use change. However, the relationship between SOM molecular diversity and SOC before and after natural wetland reclamation remains unclear. Here, we selected seven groups of natural wetland–reclaimed wetlands for spatially paired sampling. SOM molecular diversity was assessed using pyrolysis–gas chromatography–mass spectrometry (py-GC/MS), and factors driving changes in SOM molecular diversity (including microbial community characteristics, enzyme activities, carbon mineralisation rate and soil environmental factors) were investigated. The results showed that molecular diversity (Shannon diversity, Richness) tended to increase with increasing organic carbon content in both wetland and paddy soils. And the soil mineralisation rate decreased with the increase of molecular diversity. This suggests that the relationship between molecular diversity and organic carbon content is not decoupled, even in anaerobic or cyclic anaerobic environments. Therefore, the molecular diversity of soil organic matter can be used as an indicator of the sustainability of soil carbon pools. Microbial biomass and enzyme activity characteristics were important factors influencing soil carbon dynamics and molecular diversity. Molecular diversity decreases with a loss of soil organic carbon after wetland reclamation. Compared to those in natural wetlands, the relative proportions of both aliphatic and alkyl compounds decreased, and the relative proportions of nitrogenous compounds increased in paddy field soils. In addition, the rate of soil carbon mineralisation increases despite the presence of a greater proportion of recalcitrant carbon (phenols and aromatics) in paddy soils. Our results also suggest a positive role for molecular diversity in suppressing soil mineralization rates. Our study provides a molecular diversity-based perspective for understanding wetland soil organic carbon dynamics under the influence of reclamation.
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2. 题目: Agroforestry increases soil carbon sequestration, especially in arid areas: A global meta-analysis

文章编号: N24122214
期刊: Catena
作者: Jiachen Pan, Shuotong Chen, Dejun He, Hao Zhou, Ke Ning, Ning Ma, Kaiyi Li, Dongxi Liao, Wenhai Mi, Qicong Wu, Congzhi Zhang, Zhi Dong
更新时间: 2024-12-22
摘要: Agroforestry as a planting strategy for restoration, conservation, and climate change mitigation, can alter plant carbon (C) input and microbial-mediated C output, which in turn affects soil organic carbon (SOC) accumulation. However, a quantitative analysis of the C sequestration potential of agroforestry at the global scale is lacking. Here, by collecting 561 pairs of observations worldwide, we conducted a meta-analysis to quantify the impact of agroforestry on SOC sequestration as well as soil properties and microorganisms. On average, agroforestry increased SOC by 10.7 %, dissolved organic carbon by 10.2 % and CO2 emissions by 10.2 % compared to other land uses (cropland, forest and uncultivated land). Across all climate zones, SOC of agroforestry increased the most in arid areas (18.7 %). Compared with monoculture, agroforestry has more advantages in terms of microbial biomass, diversity and soil nutrient content. Our findings highlight the response of agroforestry SOC sequestration to different land managements and climate zones.
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3. 题目: Lignocellulosic biowaste hydrothermal humification: Is there a method for predicting humic acid?

文章编号: N24122213
期刊: Chemical Engineering Journal
作者: Yuchao Shao, Jianchao Wang, Zhiqiang Dong, Yujie Wang, Wenjing He, Weizhong Huo, Rong Ye, Yanqing Liu, Kexue Liu, Jialin Xue, Wenjing Lu, Tianxue Yang
更新时间: 2024-12-22
摘要: Biomass-derived hydrochar exhibits significant potential for producing hydrothermal humic acid (HHA) in an alkaline hydrothermal environment. However, the quantitative relationship between the chemical characteristics of hydrochar and HHA yield remains unclear, and a method for assessing the hydrothermal humification potential of lignocellulosic biowaste under complex conditions is lacking. This study addressed this knowledge gap by identifying three scenarios based on the key indicator “the unsaturation degree of lignocellulosic biowaste’s and hydrochar’s average molecular formula (defined as Ω₁ and Ω₂, respectively)”: (1) insufficient hydrothermal carbonization (Ω₂ − Ω₁ < 1), (2) sufficient hydrothermal carbonization (Ω₂ − Ω₁ ≥ 1 and Ω₂ ≤ 4), and (3) excessive hydrothermal carbonization (Ω₂ ≥ 4). Using these scenarios, the study compiled data from literature and established a database (approximately 500 data sets) on the hydrothermal humification of lignocellulosic biowaste via hydrochar. Subsequently, the study applied a machine learning approach—Particle Swarm Optimization and Least Squares Support Vector Machine (PSO-LS-SVM)—to predict HHA yield based on different raw materials and complex hydrothermal conditions. The MAE, MSE, RMSE, and R² values from 50 random PSO-LS-SVM models demonstrated high accuracy and stability in predictions, with the highest R² values reaching 0.96 (scenario 1) and 0.97 (scenario 2). This approach can significantly reduce costs and effort for users conducting biowaste hydrothermal humification experiments.
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4. 题目: Environmental Drivers of Dissolved Organic Matter Composition Across Central European Aquatic Systems: A novel correlation-based machine learning and FT-ICR MS approach.

文章编号: N24122212
期刊: Water Research
作者: Michel Gad, Narjes Tayyebi Sabet Khomami, Ronald Krieg, Jana Schor, Allan Philippe, Oliver J Lechtenfeld
更新时间: 2024-12-22
摘要: Dissolved organic matter (DOM) present in surface aquatic systems is a heterogeneous mixture of organic compounds reflecting its allochthonous and autochthonous organic matter (OM) sources. The composition of DOM is determined by environmental factors like land use, water chemistry, and climate, which influence its release, movement, and turnover in the ecosystem. However, studying the impact of these environmental factors on DOM composition is challenging due to the dynamic nature of the system and the complex interactions of multiple environmental factors involved. Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) enables detailed molecular-level analysis of DOM, allowing the identification of thousands of individual molecular formulas potentially representing unique markers for its “molecular history”. The combination of FT-ICR MS with machine-learning techniques is promising to unravel DOM-environment interactions owing to their capacity to capture complex non-linear relationships. We present a novel unsupervised multi-variant machine-learning approach, aiming to model correlation coefficients as robust indicators of how changes in environmental factors (e.g., the concentration of nutrients or the land use) result in changes in the molecular formula descriptors of DOM (i.e., aromaticity index or hydrogen to carbon ratio). We applied this approach to an environmental data set collected from 84 sites across central Europe exhibiting a broad range of water chemistry and land uses. Our model revealed an increase in molecular mass and aromaticity of DOM in densely forested regions as compared to open urban areas, where DOM was characterized by higher concentrations of dissolved ions and increased microbial degradation, leading to smaller and more aliphatic DOM. Our findings highlight the substantial human impact on climate change, as evidenced by the accelerated photochemical and microbial degradation of DOM, which consequently enhances greenhouse gas emissions and exacerbates global warming.
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5. 题目: Energy production and denitrogenation performance by sludge biochar based constructed wetlands-microbial fuel cells system: Overcoming carbon constraints in water

文章编号: N24122211
期刊: Water Research
作者: Boda Ouyang, Zhiyong Zhang, Fuzhi Chen, Fei Li, Ming-Lai Fu, Huachun Lan, Baoling Yuan
更新时间: 2024-12-22
摘要: As freshwater demand grows globally, using reclaimed water in natural water bodies has become essential. Constructed wetlands (CWs) are widely used for advanced wastewater treatment due to their environmental benefits. However, low carbon/nitrogen (C/N) ratios in wastewater limit nitrogen removal, often leading to eutrophication. This study explores the use of sewage sludge biochar (SB) and activated carbon (AC) as electrodes in microbial fuel cell-constructed wetlands (MFC-CW) to enhance nitrogen removal and energy generation. Results indicated that the sludge biochar closed-circuit CW (MSBS-CW) achieved considerable total nitrogen removal (95.85%) and maximum power density (9.05 mW/m²). Furthermore, high-throughput sequencing and functional gene analysis revealed substantial shifts in the microbial community within MSBS-CW, particularly in the electroactive bacteria (Geobacter), autotrophic denitrifying bacterium (Hydrogenophaga, Thiobacillus) and anaerobic ammonium oxidation bacteria (Candidatus_Brocadia). Electrochemical and material characterization showed that SB enhanced the cathode's electrochemical performance and the anode's biocompatibility, thereby improving denitrification and energy generation. This study demonstrates that sludge biochar is an effective low-cost electrode material for MFC-CW systems, offering a sustainable solution for nitrogen removal and energy production under carbon-constrained conditions.
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6. 题目: Functionalization of MXenes [Ti3C2(=O/OH/F)X] with highly mesoporous NH2-activated biochar for permselective salty ions removal by capacitive deionization

文章编号: N24122210
期刊: Chemical Engineering Journal
作者: Joemer Absalon Adorna, Van Dien Dang, Thanh van Nguyen, Bishal Kumar Nahak, Keng-Ku Liu, Ruey-An Doong
更新时间: 2024-12-22
摘要: Capacitive deionization (CDI) is a cutting-edge solution for efficient saltwater desalination. In this study, the gas-hydrolyzed nanoflake MXenes (OMX) was hydrothermally synthesized and then coupled with amine-charged activated biochar (cAB) to form the asymmetric CDI for enhanced salty ion removal. The ratio of negatively charged –OH/=O/-F terminal group of Ti₃C₂T_X MXenes was optimized for better ion intercalation. Concurrently, the positively-charged cAB was used as an anode to eliminate the need for expensive ion-exchange membranes. The cAB structure creates a multi-porous network ideally for ion accommodation, which can retain 80 % of its original surface area after amination. Moreover, the interlayer spacing of OMX can expand from 9.3 to 13.4 Å after hydrolyzation at 120 °C. Electrochemical tests of OMX exhibits a specific capacitance of 185.0 F g⁻¹ at 5 mV/s, while the strong interaction between amine functional groups and Na₂SO₄ electrolyte enhances the capacitance of cAB up to 255 F g⁻¹ at 5 mV/s and retains 75 % of the original value at 100 mV/s. The asymmetric cAB||OMX hybrid CDI can minimize the co-ion repulsion, resulting in the enhancement of CDI efficiency. The specific electrosorption capacity of cAB||OMX can achieve 49.3 mg g⁻¹ at 5000 mg L⁻¹ NaCl and at 1.2 V. The Ragone plot of SEC and SAR in cAB||OMX highlights the minimal requirement of IEM on gas-hydrolyzed MXene hybrid CDI system, which can open the avenue to enhance the desalination performance for diverse water-energy nexus applications
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7. 题目: Nutrient loading accelerates breakdown of refractory dissolved organic carbon in seagrass ecosystem waters

文章编号: N24122209
期刊: Water Research
作者: Xia Zhang, Songlin Liu, Yunchao Wu, Hongxue Luo, Yuzheng Ren, Jiening Liang, Xiaoping Huang, Peter I Macreadie
更新时间: 2024-12-22
摘要: Nutrient loading is a major driver of seagrass ecosystem decline and also threatens the capacity for seagrass ecosystems to act as ‘blue carbon’ sinks. Dissolved organic carbon (DOC) represents a crucial component of carbon storage in seagrass ecosystems, with refractory DOC (RDOC) playing a key role in long-term (millennial time scale) carbon stocks. The processes governing RDOC are heavily influenced by microbial activity. While it is known that nutrient loading can weaken DOC sequestration potential by changing the DOC composition and transformation, the impact of nutrients on microbial communities that regulate the RDOC pool in seagrass ecosystems remains poorly understood. To address this gap, we conducted a 300-d laboratory incubation experiment to examine the effects of nutrient enrichment on DOC processing and microbial community dynamics. As expected, nutrient addition significantly accelerated the decline in DOC concentration, resulting in the residual DOC exhibiting a higher degree of humification and more depleted δ¹³C constituents. Concurrent with DOC degradation, microbial community composition shifted from a mix of r- and K-strategists in the early stages to a dominance of K-strategists and fungi in the later stages. Specific bacterial taxa, such as unidentified Rhodospirillales and Oceanococcus, were more prevalent in eutrophicated seagrass waters, while Magnetospira and Nocardioide were more abundant in less eutrophicated waters by the end of the incubation. We speculated that these microbial groups likely adapted to utilise more RDOC, contributing to its decline. The decline in RDOC was approximately 2-times greater in less eutrophicated seagrass waters compared to more eutrophicated waters (26.9% and 14.5% decline respectively), which suggests that less eutrophicated seagrass ecosystems are more vulnerable. This study provides evidence that high nutrient loading can enhance RDOC remineralization, ultimately weakening the long-term carbon sequestration potential of seagrass ecosystems.
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8. 题目: Probing Mineral-Organic Interfaces in Soils and Sediments Using Optical Photothermal Infrared Microscopy

文章编号: N24122208
期刊: Environmental Science & Technology
作者: Floriane Jamoteau, Mustafa Kansiz, Miriam Unger, Marco Keiluweit
更新时间: 2024-12-22
摘要: Interactions among microbes, minerals, and organic matter are key controls on carbon, nutrient, and contaminant dynamics in soils and sediments. However, probing these interactions at relevant scales and through time remains an analytical challenge due to both their complex nature and the need for tools permitting nondestructive and real-time analysis at sufficient spatial resolution. Here, we demonstrate the ability and provide analytical recommendations for the submicron-scale characterization of complex mineral-organic microstructures using optical photothermal infrared (O-PTIR) microscopy. Compared to conventional infrared techniques, O-PTIR spectra collected at submicron resolution of environmentally relevant mineral and organic reference compounds demonstrated similar spectral quality and sensitivity. O-PTIR detection sensitivity was greatest for highly crystalline minerals and potentially for low molecular weight organic compounds. Due to photothermal effects, O-PTIR was more sensitive toward organics than minerals compared to conventional IR approaches, even when organics were mineral-bound. Moreover, O-PTIR resolved mineral-bound and unbound organics in a complex mixture at submicron (<500 nm) resolution. Finally, we provide best practices for artifact-free analysis of organic and mineral samples by determining the appropriate laser power using damage thresholds. Our results highlight the potential of O-PTIR microscopy for nondestructive and time-resolved analysis of dynamic microbe-mineral-organic matter interactions in soils and sediments.
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9. 题目: Ultrafast decomposition of refractory organics by electric field enhanced permanganate/peroxymonosulfate process

文章编号: N24122207
期刊: Chemical Engineering Journal
作者: Suo Liu, Ting Si, Jiahui Fan, Shuaishuai Yang, Qixin Pan, Ying Zhu, Min Li, Zhihua Sun, Yuzhu Fan, Chun Zhao
更新时间: 2024-12-22
摘要: A novel water treatment process called electrolysis-enhanced permanganate/peroxymonosulfate (E-PM-PMS) was investigated. The process demonstrated rapid degradation of persistent organic pollutants, such as carbamazepine (CBZ), diclofenac (DCF), and tetracycline (TC). For the degradation of ibuprofen (IBP), the E-PM-PMS process showed the highest mineralization ratio (55.76 %) and the lowest energy consumption (8.930 kWh m⁻³) within 120 min, compared with the PM-PMS (25.93 %, 61.814 kWh m⁻³) and E-PMS (31.07 %, 67.903 kWh m⁻³) processes. Mechanism studies indicated that the introduction of an electric field could promote the Mn(VII)/Mn(VI) cycle to form more permanganate (VI) complexes, resulting in the generation of more active species. Additionally, the MnO₂ produced in large amounts during the reaction could activate PMS to generate active species through the Mn(III)/Mn(IV) cycle, while also being activated by these active species to form Mn(V) and Mn(VI). Both the electric field and PMS reacting with PM led to the formation of various RMnS species (Mn(VI)_aq, Mn(V)_aq, Mn(IV)_s, and Mn(III)_aq). Through radical scavenging, electron paramagnetic resonance (EPR) experiments, it was proved that the degradation of IBP was mainly driven by reactive radicals, which are SO4∙- (72.24 %) and ^•OH (12.38 %). Twelve intermediate products were detected in total, and four possible degradation pathways for ibuprofen were identified. Within a certain range, increasing PMS concentration, PM dosage, current density, NO₃⁻ concentration, and decreasing the pH improved the efficiency of IBP elimination in the E-PM-PMS process, while Cl⁻, HCO₃⁻, PO₄³⁻, and humic acid hindered it. Overall, the E-PM-PMS process shows promise as an economical, eco-friendly, and efficient water treatment technique
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10. 题目: Spatiotemporal dynamics of soil organic carbon in desert region and its response to climate change: A case study of Heihe river

文章编号: N24122206
期刊: Ecological Indicators
作者: Yuqing Chen, Haiyang Xi, Wenju Cheng
更新时间: 2024-12-22
摘要: Soil organic carbon (SOC) plays a vital role in regulating atmospheric CO2 levels. As global climate change intensifies, understanding the dynamics of the SOC pool becomes the key to assessing the potential for carbon sequestration in terrestrial ecosystems. However, the long-term response mechanisms of SOC density in desert regions to climate change remain unclear, increasing uncertainty in estimating the carbon sequestration potential of these ecosystems. This study aims to construct a comprehensive SOC database for the lower reaches of the Heihe River (HRL) and simulate the spatiotemporal distribution of SOC density within the 0 – 100 cm soil profile. The results indicate that the key indicators of different soil layers are not consistent for SOC density mapping in arid regions. Latitude (LAT), Elevation (ELE) and Normalized difference salinity index (NDSI) are particularly important in shallow soil layers (0–20 and 20–40 cm). Spatially, SOC density in the HRL is primarily distributed along river corridors, aligning closely with vegetation patterns. Additionally, SOC density shows a positive correlation with temperature and a negative correlation with precipitation. The period from the 2050 s to the 2060 s is a critical period for SOC changes in the HRL. Under the low-emission scenario (SSP 119), soil in the HRL shifted from being a carbon sink to a carbon source in the 2050 s. Under the medium-emission (SSP 245) and high-emission scenarios (SSP 585), soil remained a carbon sink overall but began transitioning around the 2060 s and 2050 s, respectively, before stabilizing. This study demonstrates significant carbon sequestration potential in arid region soils, highlighting their essential role in soil carbon storage that cannot be overlooked. The findings of this study provide data references and foundations for understanding the response of SOC in arid regions to climate change.
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11. 题目: Enhanced activation of peroxymonosulfate by CuO modified biochar through mechanochemical synthesis: Insights into the roles of active sites and electron density redistribution

文章编号: N24122205
期刊: Journal of Environmental Chemical Engineering
作者: Xiaoqian Fu, Liangguo Yan, Haiqiang Qi, Wen Song, Yanfei Li, Xuguang Li
更新时间: 2024-12-22
摘要: Biochar (BC)-based materials have garnered significant attention in the realm of peroxymonosulfate-based advanced oxidation processes (PMS-AOPs). However, modulating the catalytic sites and charge distribution of BC to enhance PMS activation remains a challenge. In this study, we utilized mechanochemical technology to prepare a composite material of BC and CuO (BM BC-CuO). The characterization results and DFT calculations revealed that CuO modification could augment BC's defects and functional groups and modulate its charge distribution. Within 40 min of using only 20 mg/L of the catalyst, 99.55% of tetracycline (TC) was degraded. Besides, BM BC-CuO was loaded onto a sponge for continuous experiments, and TC degradation efficiency remained around 90% over 30 h. Hydroxyl radicals and singlet oxygen were the reactive species for TC degradation, while C=O, Cu-OH, and Cu(I) were the primary catalytic sites in BM BC-CuO/PMS system. The study presents an innovative approach for creating effective BC-based catalysts and enhances our comprehension of the functions of primary active entities in the catalyst/PMS framework.
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12. 题目: Spectral and molecular insights into the variations of dissolved organic matter in shallow groundwater impacted by surface water recharge

文章编号: N24122204
期刊: Water Research
作者: Hongyu Ding, Mingxia Zheng, Lina Yan, Xiaoyu Zhang, Lu Liu, Yuanyuan Sun, Jing Su, Beidou Xi, Huibin Yu
更新时间: 2024-12-22
摘要: Dissolved organic matter (DOM) represents one of the most active elements in aquatic systems, whose fraction is engaged in chemical and biological reactions. However, fluorescence, molecular diversity and variations of DOM in groundwater systems with the alteration of surface water recharge remain unclear. Herein, Excitation–emission matrix (EEM) fluorescence spectroscopy and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) combined with principal component coefficients, parallel factor analyses (PARAFAC) with two‒dimensional correlation spectroscopy (2D-COS) were applied in this study. EEM data reassembled for principal component analysis (PCA) highlighted differences in tryptophan-like peak between groundwater collected parallel to the river (PR) and those taken vertical to the river (VR). PARAFAC have identified six components, i.e., microbial-related humic substances (C1 and C6), protein-like substances (C2 and C5), and terrestrial humic-like substances (C3 and C4). In the PR direction, variations of fluorescence components were dominated by terrestrial humic-like substances, while microbial humic-like substances predominated in the VR direction, as revealed by 2D-COS analysis. FT-ICR MS data showed a similar DOM molecular evolution trend in groundwater. Specifically, biodegradable molecular formulas decreased with a diminishing contribution of river water to groundwater recharge. This decrease was accompanied by a decrease in O₃S and O₅S components, which highlight the influence of anthropogenic river water on groundwater DOM characteristics. Groundwater DOM variations were attributed to the influx of bioavailable and low-oxidized components and the release of terrestrial humic-like substances during river water recharge processes. This study contributes valuable insights into the transformations of DOM in groundwater systems influenced by surface water recharge, enhancing our understanding of the interplay between surface water and groundwater quality.
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13. 题目: Enzyme activity and microbial resource limitation mediated the soil priming effect in response to straw C components in Clay and Loam

文章编号: N24122203
期刊: Journal of Soils and Sediments
作者: Yunfa Qiao, Jiarui Lan, Jiaojiao Lei, Xiaoyi Wang, Shujie Miao
更新时间: 2024-12-22
摘要:

Purpose

Priming effect (PE) of soil organic carbon induced by exogenous carbon (C) plays a crucial role in the turnover and storage of soil carbon pool, and it is strongly regulated by soil microorganism and extracellular enzyme. However, the understanding of the strength and microbial mechanisms of PE in response to exogenous carbon components, and where there is microbial resource limitation remains inadequate. Therefore, the aim of the study is to evaluate the microbial mechanisms of PE in response to exogenous carbon components.

Materials and methods

Three carbon components of rice straw (Lip-C, Wat-C and Res-C) and whole straw (Str-C) were added to Clay and Loam in laboratory experiment. During incubation, the CO₂ emission and ¹³C abundance were measured. Soil microbial biomass carbon (MBC), soil extracellular enzyme activity, PE and microbial resource limitation were checked at 37- and 65-day after incubation.

Results and discussion

Results showed that Wat-C, Res-C and Str-C addition induced positive PE, and the intensity of PE was in the order of Wat-C > Str-C > Res-C. Lip-C addition induced negative PE. The intensity of positive PE in Clay was higher than that of the negative PE in Loam. There were significant relationships between PE and extracellular C, N and P-cycling enzymes, which were much stronger on 37-day than 65-day after incubation. Soil microorganisms in Clay and Loam were largely limited by P and N on 37-day after incubation, respectively. On 65-day, the major microbial resource limitation was P in two soil types, except of N limitation in Clay with Res-C addition. The interaction of microbial growth, enzyme activity and PE depended on straw C component and soil nutrient.

Conclusions

All these findings improved out the knowledge of microbial resource limitation over straw C addition according to soil enzyme activity, and P might be another important driver as well as the effects of C and N on PE. The present results would have potential for predicting soil C dynamic and developing sustainable agricultural practices in the future.

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14. 题目: Adsorption properties and competitive adsorption mechanism exhibited by carbon-nanotube-modified biochar for removal of crude oil and Ni(II) pollutants from water

文章编号: N24122202
期刊: Ecotoxicology and Environmental Safety
作者: Di Cao, Ruiyan Niu, Guanglu Mo, Huiwen Deng, Rui Liu, Jie Liu, Jialin Fan
更新时间: 2024-12-22
摘要: Carbon-nanotube-modified biochar (CNT3-CBC) with a nanostructured surface was prepared by using cattle manure as the raw material via the impregnation method. This modified biochar was then used to adsorb petroleum and Ni(II) from aqueous solutions. Various physicochemical characterization techniques were employed, including SEM, BET analysis, FTIR, and XPS. Kinetic and isothermal adsorption characteristics were analyzed. The influence of different biochar dosages, solution pH levels, and number of adsorption cycles on the efficiency of removal of crude oil and Ni(II) was meticulously evaluated. Results indicated that modified biochar had a higher surface area, a greater number of surface functional groups, and higher interaction forces compared to biochar. Adsorption kinetics and isotherms showed that modified biochar had a strong adsorption capacity. The experimental data conformed closely to the Elovich, Langmuir, and Freundlich adsorption models, underscoring the significant contributions of both physical and chemical adsorption mechanisms. Competitive adsorption of modified biochar in the co-sorption of petroleum and nickel solutions exists, and the modified biochar demonstrated high capacities for crude oil and Ni(II) in the competitive adsorption. The modified biochar prepared at a pyrolysis temperature of 800°C exhibited a superior adsorption performance, and the adsorption capacities of crude oil and Ni(II) were 303.03 mg·g⁻¹ and 32.87 mg·g^-¹ , respectively. Modified biochar has better regeneration potential after crude oil and Ni(II) adsorption, with the removal efficiency remaining above 50 % in the fourth cycle. As an efficient and environmentally friendly adsorbent, modified biochar shows great potential for removing crude oil and Ni(II) pollutants from water.
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15. 题目: Probing Methylmercury Photodegradation by Different Fractions of Natural Organic Matter in Water: Degradation Kinetics and Mercury Isotope Fractionation Characteristics

文章编号: N24122201
期刊: Environmental Pollution
作者: Lian Zhang, Qingliang Dai, Huaqing Liu, Yanbin Li, Yongguang Yin, Guangliang Liu, Peng Dai, Xiaoqiang Cao, Jian Zhang, Yong Cai
更新时间: 2024-12-22
摘要: Recent advancements in mercury (Hg) isotopic fractionation research have evolved from conceptual demonstrations to practical applications. However, few studies have focused on revealing fractionation fingerprinting for aqueous methylmercury (MeHg) photodegradation due to its sensitivity to natural organic matter (NOM). Here, the impact of NOM fractions with varying chemical properties on MeHg photodegradation kinetics and Hg isotope fractionation characteristics was investigated. Findings reveal that reduced NOM, containing alcohol/phenol groups, slows the degradation rate compared to the oxidized. Low-molecular-weight NOM, rich in thiol groups, enhances the degradation rate more effectively than high-molecular-weight counterparts. Hydrophilic/hydrophobic-acidic/basic NOM also significantly influence the rate constant, with the highest for hydrophilic-acidic NOM. Isotopic analysis showed that NOM's redox properties affect the extent and direction of Hg isotope fractionation. NOM with various molecular weights controls mass-dependent and mass-independent fractionation by regulating MeHg-NOM triplet radical pairs reactions, likely due to differences in functional groups. Similar effects were observed for different hydrophilic/hydrophobic-acidic/basic fractions. Further experiments with scavenger addition indicated that direct photodegradation of MeHg-NOM is a possible degradation mechanism, with free radicals/reactive oxygen species playing a minor role. These findings underscore the sensitivity of both the degradation rates and Hg isotope fingerprinting to different NOM fractions.
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