论文检索

总访问量：2723983次

总访客量：122730人

所有论文

61. 题目: Tree diversity affects temperature sensitivity of soil organic matter decomposition in rhizosphere
文章编号: N25041505
期刊: Plant and Soil
作者: Fei Gao, Dandan Gao, Chen Ning, Shuguang Liu, Yakov Kuzyakov, Andy Smith, Wende Yan
更新时间: 2025-04-15
摘要:

Background and aims

Tree diversity strongly regulates organic matter inputs by rhizodeposition for microorganisms and microbial communities, impacting soil carbon (C) dynamics and stability. Because of much larger organic C availability in the rhizosphere, it can respond differently to tree diversity compared to bulk soil. To explore soil C stability under global warming, we assessed the temperature sensitivity (Q₁₀) of organic matter decomposition in rhizosphere and bulk soil depending on tree diversity.

Methods

Q₁₀ of organic matter decomposition in rhizosphere and bulk soil in a subtropical forest were examined using short-term incubation under controlled conditions depending on tree diversity. Fine root traits and soil C and N availability were evaluated as related to microbial properties.

Results

With increasing tree diversity, Q₁₀ remained stable in the rhizosphere but decreased in the bulk soil. While greater tree diversity increased fine root biomass, soil C and N availability, microbial K/r strategy ratios in rhizosphere and bulk soil shifter towards the r strategists, with a reduced bacterial K/r strategy ratio. However, microbial gene copy numbers and Shannon diversity remained stable. Partial correlation and multiple regression analysis revealed that rhizosphere Q₁₀ remained stable because of C excess and larger microbial abundance. The Q₁₀ reduction in bulk soil correlated with increased C availability and a shift in microbial community towards a lower K/r strategy ratio.

Conclusion

The Q₁₀ decoupling between rhizosphere and bulk soil highlights a trade-off, where increasing tree diversity accelerates organic matter decomposition in rhizosphere to sustain nutrient supply, while maintaining bulk C pool stability under global warming.

62. 题目: Simultaneous removal of cadmium and tetracycline from aqueous solutions by oxalic acid and pyrite co-modified biochar: Performance and mechanism
文章编号: N25041504
期刊: Environmental Research
作者: Sichen Li, Yujiang Huang, Wenjun Zhou
更新时间: 2025-04-15
摘要: The remediation of combined contamination with heavy metals and antibiotics in soil and aqueous environments represents an ongoing challenge. In this study, a novel highly functionalized biochar-based composite (FeS₂@OA-BC) was synthesised by combining oxalic acid (OA) pre-treatment with ball-milling of FeS₂ for the simultaneous removal of cadmium (Cd²⁺) and tetracycline (TC) from aqueous solutions. FeS₂@OA-BC demonstrated exceptional performance in simultaneously removing 74.7 % of Cd²⁺ and 95.8 % of TC from the binary systems, meanwhile the degradation rate of TC reached up to 64.8 %. Moreover, no significant competitive or promoting effects between Cd²⁺ and TC removal were observed by FeS₂@OA-BC in binary systems. The adsorption of Cd²⁺ was primarily governed by three mechanisms: complexation with functional groups, Cd-π conjugation and cation exchange. Meanwhile, TC degradation relied on reactive oxygen species (ROS), where hydroxyl radicals (•OH) and hydrogen peroxide (H₂O₂) played dominant roles, with singlet oxygen (¹O₂) contributing minimally. The co-modification of OA and FeS₂ synergistically introduces abundant exogenous defect sulphur vacancies (SVs), enhancing molecular oxygen activation and stimulating more ROS for TC degradation, as well as promoting more functional groups as adsorption sites for Cd²⁺ complexation. This therefore ultimately led to the reinforcement of the concurrent removal of Cd²⁺and TC. Overall, FeS₂@OA-BC shows great promise for addressing combined pollution involving heavy metals and antibiotics in environmental systems.

63. 题目: Chemical oxygen demand (COD) reduction in wastewater from the textile industry by coagulation-flocculation and adsorption
文章编号: N25041503
期刊: Environmental Monitoring and Assessment
作者: Soufiane Youcef, Meriem Chebbi, Leila Youcef, Mohamed Ghrissi Bouaziz, Amina Soudani, Amane Sahli, Chaima Deroues
更新时间: 2025-04-15
摘要:

The aim of this work was to test the effectiveness of coagulation-flocculation using ferric chloride (FeCl₃) and adsorption on a biochar (OSB) prepared in the laboratory and their combination on textile industry wastewater treatment. By coagulation-flocculation, increasing the dose of FeCl₃ significantly improved the reduction of chemical oxygen demand (COD) levels as well as turbidity in the wastewater. The COD value (1520 mg O₂/L) decreased as the coagulant dose increased, reaching a value of 240 mg/L corresponding to an optimum FeCl₃ dose of around 2500 mg/L. When adsorption was applied to the biochar after 4 h of agitation, the COD reduction efficiency was 83.65%. Application of the kinetic models confirmed that chemisorption of the pollutants presented by the COD on the surface of OSB was predominant. COD reduction efficiency improved significantly with increasing adsorbent dose and wastewater initial pH variations. Combining the two processes, starting with coagulation-flocculation followed by adsorption on OSB, was a cost-effective technique. This satisfactory result was based on the fact that this combination enables a lower dose of coagulant (2500 to 100 mg/L) and adsorbent (4 to 2 g/L) to be used than that required when treating by each process alone.

64. 题目: Long‐range transport of terrestrial particulate organic carbon to the open ocean by sediment resuspension
文章编号: N25041502
期刊: Limnology and Oceanography
作者: Hyekyung Park, Hanbyul Lee, Nahyeon Kwon, Sojin Park, Jihyun Park, Weol Ae Lim, Guebuem Kim
更新时间: 2025-04-15
摘要: The transport of particulate organic carbon (POC) from land to deep‐sea sediments is a critical component of the global carbon cycle. However, the transport processes of terrestrial POC across continental shelves remain poorly understood due to the complexity of these systems. In this study, we investigated the vertical fluxes and fates of terrestrial vs. marine POC using stable carbon isotope ratios (δ13C) and 234Th tracers along two transects in the southern coastal region of Korea. The POC concentrations were highest in the surface layer and decreased with depth, with a slight increase near the seafloor. The δ13C values revealed that terrestrial POC contributed 29% ± 24% of the total POC, with higher contributions at the innermost stations and in the bottom layer. Based on 234Th–238U disequilibria, the residence times of particulate 234Th (8.1 ± 3.6 d) were significantly longer than those of dissolved 234Th (3.7 ± 2.2 d). The much higher vertical fluxes of terrestrial POC in the deeper layer relative to the upper layer suggest that terrestrial POC undergoes multiple turnover cycles through sediment resuspension before burial, while marine POC degrades preferentially in the course of settling. These findings highlight that effective sediment resuspension and the refractory nature of terrestrial POC allow for its long‐range transport (> 200 km) to the deep Ulleung Basin in the East Sea (Japan Sea). This study sheds new light on the mechanisms driving the transport of terrestrial POC from coastal regions to the deep ocean.

65. 题目: A promising peanut shell-derived biochar via ultrasonic-assisted P/O codoping for simultaneous adsorption of cadmium(II) and tetracycline from aqueous solutions
文章编号: N25041501
期刊: Journal of Environmental Chemical Engineering
作者: Shengsheng Miao, Yifeng Sheng, Xu Xia, Wei Chen, Hongmei Zhang, Kunquan Li
更新时间: 2025-04-15
摘要: In the context of global large-scale livestock farming, antibiotic and heavy metal compound pollution has become an urgent environmental issue.This study presents an novel eco-friendly ultrasound-assisted one-step carbonization-activation strategy for the efficient synthesis of O/P co-doped biochar (OPBCx) derived from peanut shell with exceptional selective adsorption capabilities for concurrent removal of tetracycline (TC) and Cd²⁺ contaminants. The optimized OPBC3, engineered through systematic H₃PO₄ dosage modulation, achieves exceptional equilibrium adsorption capacities of 570 mg/g for TC and 15.56 mg/g for Cd²⁺ in competitive TC/Cd²⁺ coexisting systems. Mechanistic investigations reveal that the material’s superior selectivity stems from distinct C₃P=O and COOH/C=O functional sites, as conclusively demonstrated through integrated adsorption kinetics-thermodynamics analyses, multimodal spectroscopic characterization(FTIR/XPS), and density functional theory (DFT) simulations. Results also show that the C₃P=O was primarily responsible for Cd²⁺ adsorption and COOH/C=O sites was critical for TC-selective uptake. Notably, the optimized OPBC3 exhibits excellent anti-interference performance towards TC/Cd²⁺ in high salinity and over a wide pH range. This work introduces a novel green method for synthesizing O/P co-doped biochar with highly selective adsorption sites, offering a promising solution for efficient treatment of complex pollutants.

66. 题目: Molecular characteristics and plastic additives in dissolved organic matter derived from polystyrene microplastics: Effects of cumulative irradiation and microplastic concentrations
文章编号: N25041305
期刊: Water Research
作者: Yuanyuan Cao, Yang Liu, Kehui Guo, Wei He, Jin Hur, Huaming Guo
更新时间: 2025-04-13
摘要: Microplastic-derived dissolved organic matter (MP-DOM), released during ultraviolet-induced aging of microplastics (MPs), has emerged as a critical yet underexplored topic regarding the environmental impacts of MPs. However, the effects of irradiation intensity on the release and molecular diversity of MP-DOM, including plastic additives, remain poorly understood. In this study, the photoaging processes of polystyrene MPs (PS-MPs) were simulated under varying cumulative irradiation (irradiation intensity × irradiation duration) and PS-MPs concentrations (1−5 g/L). The PS-derived DOM (PS-DOM) was characterized using fluorescence spectroscopy, Fourier transform-ion cyclotron resonance mass spectrometry (FT-ICR MS), and liquid chromatography coupled with high-resolution mass spectrometry (LC-HRMS). After 21 days of irradiation, the amount of leached PS-DOM ranged from 7.76 to 39.40 mg-C/g. Cumulative irradiation significantly accelerated PS-MPs aging and PS-DOM leaching (p < 0.001). Initially, these processes proceeded slowly until the cumulative irradiation exceeded 75 kWh/m². Beyond this threshold, PS-MPs exhibited substantial size reduction, increased oxidation, and enhanced PS-DOM leaching. FT-ICR MS analysis revealed that PS-DOM contained 30.1%−31.8% unique components compared to natural organic matter, with greater degradability at lower PS-MPs concentrations. Furthermore, LC-HRMS identified 13 oxidation products and 25 plastic additives in PS-DOM, with their amounts decreasing as PS-MPs concentrations increased, from 17.05 to 3.24 mg/g and 4.88 to 1.85 mg/g, respectively. Notably, lower PS-MPs concentrations resulted in greater cumulative irradiation per unit mass, intensifying PS-DOM leaching, enhancing degradability, and the increasing plastic additives release. This study highlights the environmental implications of per unit cumulative irradiation on MP-DOM leaching and its molecular composition, providing insights into its ecological risks and potential impacts on aquatic systems.

67. 题目: Divergent mitigation mechanisms of soil antibiotic resistance genes by biochar from different agricultural wastes
文章编号: N25041304
期刊: Environmental Pollution
作者: Yu Yao, Peiyang Yang, Bin Wang, Qiao Xu, Fanhao Song, Yabo Wang, Yingdong Zhao, Lei Guo, Xiaozhi Wang, Meiling Xu
更新时间: 2025-04-13
摘要: Biochar, produced from agricultural waste, provides a sustainable solution for effective waste management and soil remediation. The potential and mechanisms of biochar derived from primary agricultural sources (plant residues and animal manure) to mitigate the antibiotic resistance genes (ARGs) pollution in agricultural soil remain underexplored. To address this, a 60-day microcosm experiment was conducted, applying biochar derived from either corn straw (B1) or chicken manure (B2) to sulfamethazine and tetracycline-contaminated soil. The results demonstrated that B1 had richer functional groups than B2. B1 increased soil pH (+1.63%) and total carbon (+24.56%), but it decreased the abundance of norank_Vicinamibacteraceae (-35.71%) and Haliangium (-42.11%), and inhibited the dissemination of tetM and tetW by 57.76% and 39.17%, respectively. Comparatively, B2 significantly increased soil dissolved organic carbon (+161.66%) and decreased the abundance of potential ARGs hosts (Acidibacter, -40.32%), leading to reduced sul2 abundance (-33.47%). Besides, B2 enhanced soil total nitrogen and bacterial diversity, and further reduced tetW abundance (-33.76%). Overall, this study revealed divergent mechanisms and potential for mitigating soil ARGs transmission by biochar derived from corn straw and chicken manure. This study contributes to developing more effective strategies for managing ARGs in contaminated soil and mitigating their environmental risks.

68. 题目: Double-edged sword of extracellular polymeric substances disintegration under chloramphenicol exposure in volatile fatty acids production and antibiotic resistance genes proliferation during sludge fermentation
文章编号: N25041303
期刊: Chemical Engineering Journal
作者: Feng Wang, Yuting Luo, Zhaoxia Xue, Qian Feng, Jiashun Cao, Yang Wu, Xiang Li, Jingyang Luo
更新时间: 2025-04-13
摘要: The valorization of waste activated sludge (WAS) into volatile fatty acids (VFAs) offers promising potential for resource recovery, yet the ubiquitous presence of antibiotics poses significant challenges. This study revealed the pivotal role of extracellular polymeric substances (EPS) in mediating chloramphenicol (CAP) effects on VFA production and antibiotic resistance genes (ARGs) proliferation during WAS fermentation. Low CAP level significantly enhanced VFAs yield by 2.88-fold, while molecular docking analysis demonstrated that CAP formed hydrogen bonds with EPS (−5.6 kJ/mol), facilitating substrate availability for microbial transformation through EPS disintegration. This disruption further altered the bacteria-archaea mutualism, shifting community dynamics toward bacterial dominance, particularly Firmicutes (increasing from 2.69 % to 8.13 %). These gram-positive bacteria, characterized by their resilient cell walls, emerged as both primary VFAs producers and ARGs carriers in the ecological niches. Consequently, the CAP-induced EPS destruction activated microbial adaptation mechanisms through enhanced expression of quorum sensing, two-component systems, and energy metabolism pathways, while simultaneously promoting ARG dissemination via mobile genetic elements (tnpA copies increasing from 0.1922 to 0.2652 copies/16S rRNA). However, excessive EPS destruction intensified microbial exposure to CAP, overwhelming adaptive mechanisms and suppressing metabolic activity, thereby reducing both VFA production and ARG proliferation. These results establish EPS as a crucial mediator in balancing resource recovery with environmental risks in antibiotic-exposed WAS treatment.

69. 题目: Mechanistic insights into the influence of dissolved organic matter in stormwater runoff on the TOrCs degradation by PB-Fe@CN: Reaction kinetics and degradation pathways
文章编号: N25041302
期刊: Chemical Engineering Journal
作者: Yatao Liu, Dongyao Yue, Jiamin Chen, Yang Yang, Ronghua Xu, Zhenbei Wang, Chen Li, Fan Li, Fei Qi, Ewa Maria Siedlecka, Jolanta Kumirska, Amir Ikhlaq, Oksana Ismailova
更新时间: 2025-04-13
摘要: Dissolved organic matter (DOM) in stormwater runoff significantly impacted the degradation efficiency of trace organic pollutants (TOrCs) by heterogeneous catalytic systems, but its quantitative elucidation and reaction kinetics remained underexplored. In this work, the influence of DOM from stormwater runoff on TOrCs purification by a phosphorus, boron, and nitrogen-doped iron@porous carbon catalyst (PB-Fe@CN) to activate peroxymonosulfate was quantitatively investigated. Bimolecular reaction rate constants were determined to quantify the interactions between DOM/TOrCs and reactive oxygen species (ROS). The PB-Fe@CN catalyst exhibited great efficiency (71.2 ∼ 100 %) in degrading TOrCs, but DOM significantly reduces ROS steady-state concentrations of the system through competitive adsorption and radical scavenging effects. Reaction kinetic analysis showed that DOM’s scavenging effect on •OH (3.05 × 10³ ∼ 3.21 × 10³ L·mgC^-1·s⁻¹) was significantly stronger than that on SO₄^•− (2.54 × 10² ∼ 2.75 × 10² L·mgC^-1·s⁻¹). Additionally, DFT calculations were employed to elucidate the degradation pathways and toxicity changes of TOrCs under DOM interference in stormwater runoff. Finally, we designed a feasible application scenario for PB-Fe@CN coupling multi-layer infiltration systems and bioretention facilities to maximize the potential of PB-Fe@CN to degrade TOrCs in stormwater runoff. This study provides a novel quantitative perspective on the mechanism of DOM in heterogeneous catalytic systems and a technical reference for the efficient resource utilization of stormwater.

70. 题目: Characteristics of microbial carbon pump in the sediment of kelp aquaculture zone and its contribution to recalcitrant dissolved organic carbon turnover: insights into metabolic patterns and ecological functions
文章编号: N25041301
期刊: Environmental Research
作者: Jun-Yang Ma, Ji-Hua Liu, Cheng-Zhuang Chen, Yi-Ze Zhang, Zhan-Sheng Guo, Min-Peng Song, Feng Jiang, Zi-Tong Chai, Zhu Li, Su-Xian Lv, Yu-Jiao Zhen, Lu Wang, Zhen-Lin Liang, Zhao-Yang Jiang
更新时间: 2025-04-13
摘要: The study delves into the microbial carbon pump (MCP) within the sediments of kelp aquaculture zones, focusing on its influence on the turnover of recalcitrant dissolved organic carbon (RDOC). Following kelp harvest, significant alterations in the microbial community structure were noted, with a decrease in complexity and heterogeneity within co-occurrence networks potentially impacting RDOC production efficiency. Metabolic models constructed identified four key microbial lineages crucial for RDOC turnover, with their abundance observed to decrease post-harvest. Analysis of metabolic complementarity revealed that RDOC-degrading microorganisms exhibit broad substrate diversity and are engaged in specific resource exchange patterns, with cross-feeding interactions possibly enhancing the ecological efficiency of the MCP. Notably, the degradation of RDOC was found not to deplete the RDOC pool; as aromatic compounds break down, new ones are released into the environment, thus supporting the renewal of the RDOC pool. The research highlights the pivotal role of microbial communities in RDOC turnover and offers fresh insights into their cross-feeding behavior related to RDOC cycling, providing valuable data to support the future development and application of MCP theory.

71. 题目: Hydrothermal carbonization aqueous phase applied to the rice paddy: Interaction between soil DOM and bacterial community on runoff water quality
文章编号: N25041211
期刊: Chemical Engineering Journal
作者: Yuanyuan Feng, Huayong He, Lisha Wang, Yahui Ji, Bingyu Wang, Bingfa Chen, Shiying He, Yanfang Feng, Lihong Xue, Baoshan Xing
更新时间: 2025-04-12
摘要: Hydrothermal carbonization (HTC), an advanced technology for wet biomass valorization, is increasingly applied to resource recovery from organic wastes such as sewage sludge. The HTC aqueous phase (HAP) has been identified as a promising artificial dissolved organic matter (DOM) for soil amendment. However, the environmental behavior of HAP, particularly sewage sludge-derived HAP (SHAP), within paddy fields and its cascading effects on the “soil DOM-soil microbiota-water quality” system remain largely unexplored. Herein, SHAP and HAP derived from another typical municipal waste (i.e., kitchen waste) (KHAP) were applied in varying proportions to the water-soil interface of paddy fields to comparatively evaluate their impacts on soil DOM, soil bacterial communities and water quality. Through Fourier transform ion cyclotron resonance mass spectrometry, we revealed that HAP application induced significant molecular restructuring of soil DOM, with a 4.0–13.3 % increase in the number and a 4.0–20.1 % enhancement in the intensity of CHON compounds, primarily driven by microbial-mediated biogeochemical processes. Variance partitioning analysis demonstrated that interactions between soil DOM and microbiota accounted for 72.5 % of the variance in water quality parameters (e.g., total nitrogen, chemical oxygen demand (COD), and dissolved oxygen). SHAP exhibited superior aquatic compatibility compared to KHAP, showing a 23.9 % reduction in COD loads compared to KHAP at low-dose conditions (150 mL). The proposed strategy, which integrates optimized HAP feedstock selection (prioritizing sewage sludge), application dosage (≤150 mL), and hydraulic retention (≥7 days), delivers synergistic benefits in non-point source pollution mitigation. This approach advances the eco-safe application of SHAP in addressing critical aquatic environmental challenges in paddy fields, aligning with the broader goals of sustainable water resource management.

72. 题目: Molecular characteristics of emerging perfluoroalkyl and polyfluoroalkyl substances (PFAS) and dissolved organic matter (DOM) in surface waters around fluorine-related industries in a Chinese Megacity
文章编号: N25041210
期刊: Environment International
作者: Shiyue Li, Jing Liu, Xinyi An, Caiming Tang, Caijun Tang, Boxuan Zhang, Chongtai Chen, Tian Lin, Kevin C Jones, Zhen Zhao
更新时间: 2025-04-12
摘要: Fluorine-related industrial discharges are the main source of per- and polyfluoroalkyl substances (PFAS) contamination in surrounding surface waters, but the long-term environmental impacts of their residual PFAS and the interactions between PFAS and dissolved organic matter (DOM) in field waters have rarely been discussed. In this study, the concentrations of 32 target PFAS were quantified, 50 PFAS were identified and semi-quantified by suspect and nontarget screening, and the molecular characteristics of DOM were analyzed in the surface water of Shanghai. Concentrations of ∑PFAS were 284 ∼ 3018 ng/L. Perfluorobutane sulfonate acid (PFBS) and perfluorooctanoic acid (PFOA) remained the predominant compounds at most sampling sites, but hexafluoropropylene oxide trimer acid (HFPO-TA) exhibited extremely high values at a few specific sites. Near a historical fluorotelomer manufacturer which was closed in 2017, ∑PFAS concentration was still at a high-level of 1800 ng/L. Thirteen nontarget and suspect PFAS including 7 iodinated perfluoroalkyl acids (IPFAAs) were identified in 100 % samples. A total of 8134 DOM molecular formulas were identified. For elemental composition, CHOS (24 %) has the highest percentage, while for molecular species, lignin (36 %) has the highest proportion of molecules. When the assignment of fluorine was included in the elemental analysis, the percentage of fluorine-containing substances reached to 55 %, suggesting the anthropogenic influences. Emerging PFAS, i.e., perfluoropentanoic acid (PFPeA) and hexafluoropropylene oxide dimer acid (HFPO-DA) were negatively related to DOM concentration (p < 0.05) due to microorganism activities. This study revealed the persistent impact of fluorine-related industries and the environmental behavior of PFAS and DOM in aquatic environments, providing support for the systematic and comprehensive evaluation of surface water health.

73. 题目: Mineral‑fungal interactions in response to biochar amendment: implications for carbon storage in saline-alkali soil
文章编号: N25041209
期刊: Plant and Soil
作者: Lu Liu, Mengmeng Chen, Jeroen Meersmans, Yuyi Li, Shirong Zhang, Xiaodong Ding
更新时间: 2025-04-12
摘要:

Background

Biochar application has been widely acknowledged as an environment-friendly practice to promote soil organic carbon (SOC) stabilization and sequestration in agroecosystems. However, the interaction between fungal and minerals on organic carbon storage and stabilization with biochar application still remains unclear in saline-alkaline soil.

Methods

In the present research, this interaction has been studied by following 6 years treatments at an experimental farm: i) CK, without any fertilization; ii) NPK, only mineral fertilizer; iii) BC, 8.0 Mg ha⁻¹ biochar-based NPK and iv) FeBC, 8.0 Mg ha⁻¹ Fe modified biochar-based NPK, respectively.

Results

The results show that the relative content of illite in BC and FeBC treatments was 4.8%-5.1% higher than that in NPK treatment. Moreover, more stable OC fractions and functional groups, including particulate organic carbon (POC) and aromatic-C, were found in BC and FeBC treatments. Meanwhile, a positive relationship between illite and aromatic-C was found. The two of which might form organic-mineral complexes to decrease specific C mineralization rate. Besides, biochar application increased the diversity of soil fungal community and composition at the phylum level, such as Ascomycota. Redundancy analysis revealed that the content of soil POC and SOC was the major property affecting fungal diversity. Furthermore, the relative abundance of Ascomycota and Basidiomycota was positively correlated with SOC storage.

Conclusion

Effects of biochar, especially Fe-modified biochar last up to six years to improve the stability and storage of SOC in saline-alkali paddy soils, which may be a better agro-management practice.

74. 题目: Variability analysis of soil organic carbon content across land use types and its digital mapping using machine learning and deep learning algorithms
文章编号: N25041208
期刊: Environmental Monitoring and Assessment
作者: Mounir Oukhattar, Sébastien Gadal, Yannick Robert, Nicolas Saby, Ismaguil Hanadé Houmma, Catherine Keller
更新时间: 2025-04-12
摘要:

Soil organic carbon (SOC) plays a crucial role in carbon cycle management and soil fertility. Understanding the spatial variations in SOC content is vital for supporting sustainable soil resource management. In this study, we analyzed the variability in SOC content across eleven different types of land use in the mining basin of Provence in southeastern France. We modelled this variability spatially using machine and deep learning regression. Four algorithms were tested: random forest (RF), support vector machine (SVM), extreme gradient boosting (XGBoost), and deep neural networks (DNNs). These integrated 162 soil samples and 21 environmental covariates, including climatic parameters, lithology, topographical features, land cover, remote sensing data, and soil physicochemical parameters. The results clearly show a large variability in SOC content across land use types, with forests revealing the highest values (mean of 69.3 g/kg) and arable land the lowest (mean of 8.9 g/kg). The Pearson correlation coefficients (R) indicate that land cover, topography, lithology, environmental indices, and clay content are the main factors influencing the SOC content. The XGBoost model generated the best result (R² = 0.73), closely followed by RF (R² = 0.68) and DNN (R² = 0.60), while SVM showed the weakest performance (R² = 0.36). XGBoost and RF remain the best options for obtaining reliable results with a limited number of soil samples and reduced calculation time. The results of this study provide vital insights for managing soil organic carbon in southeastern France and for climate change mitigation in sustainable land management.

75. 题目: Spatial distribution of typical persistent organic pollutants in South China Sea by economical solid phase microextraction with hierarchical porous biochar
文章编号: N25041207
期刊: Journal of Hazardous Materials
作者: Jinglin Chen, Yixin Kuang, Xiaoying Feng, Cheng Mao, Suxin Zhou, Weidong Zhai, Juan Zheng, Gangfeng Ouyang
更新时间: 2025-04-12
摘要: Rapid, accurate, and cost-effective determination of typical persistent organic pollutants in marine water provides crucial support for risk management and remediation. Herein, an activated Cucumis metuliferus biochar (ACMB) with large specific surface area, hierarchical structure, and large pore volume, was synthesized through a simple treatment process. Subsequently, it was fabricated as uniform solid-phase microextraction (SPME) fiber at a cost of less than 0.17 Renminbi (RMB) per fiber for the extraction of five polycyclic aromatic hydrocarbons (PAHs) and four organochlorine compounds (OCs) in marine water. The ACMB-coated fiber exhibited exceptional enrichment factors ranging from 1601 to 6732, and outperformed the commercial fibers in terms of stability, extraction performance, and production cost, verifying its outstanding practicability. By coupling it with gas chromatography-mass spectrometry (GC-MS), a highly automatic method was developed, exhibiting low detection limits (0.30-0.99 ng L^-1), wide linear ranges (5-2000 ng L^-1), and good reproducibility. It realized the highly efficient determinations of PAHs and OCs in marine water samples collected from South China Sea (n=18), providing the spatial distribution of acenaphthene, fluorene, and anthracene in the marine environment.

76. 题目: Zinc and Cadmium Remediation in Contaminated Soil by CaCO3-Biochar Material from Sugar Beet Industry
文章编号: N25041206
期刊: Water, Air, & Soil Pollution
作者: Roger Borges, Matheus B Soares, Mariana P Pollo, Luís Reynaldo F Alleoni, Amanda S Giroto, Maraisa Gonçalves, Michael Müller, Nicolai D Jablonowski, Caue Ribeiro
更新时间: 2025-04-12
摘要:

Ore mining and other industrial processes can release toxic elements such as zinc and cadmium into the soil, posing a potential environmental risk. Biochar produced by biomass pyrolysis is proposed to treat contaminated soils by sorption of the contaminants while boosting soil fertility, water retention, and microbial activity. Here, we propose the utilization of Carbokalk, an inexpensive byproduct (spent lime, SL) of the sugar-beet industry, as an ideal source for soil-treatment biochar. We examined the pyrolysis of SL containing up to 20% organic matter at various temperatures and in an oxidizing (air) and inert (N₂) atmosphere. Our results indicate that the pyrolysis temperatures and gas atmospheres greatly influence the physicochemical features of SL-biochar, identifying the most suitable temperature of 600 ºC for both atmospheres. SL-biochar incubation in contaminated soil has shown the potential to mitigate metal contamination in soils. However, under an oxidizing atmosphere, SL-biochar provides higher reductions in exchangeable Zn and Cd fractions. It accounts for 3% and 20%, respectively, along with increases in fractions associated with carbonate and organic matter. These findings demonstrate the effectiveness of SL-biochar in immobilizing these contaminants.

77. 题目: Preparation of Biochar from Straw in Northeast China to Assist in Carbon Neutrality:Data Visualization and Comprehensive Evaluation
文章编号: N25041205
期刊: Water, Air, & Soil Pollution
作者: Yingjie Dai, Hongxia Yin, Junfeng Zhao, Pengcheng Zhu, Zhilin Suo
更新时间: 2025-04-12
摘要:

Carbon neutrality is an important goal of global energy conservation and emission reduction, and achieving the green and low-carbon technological revolution. The straw biomass in Northeast China is a potential green resource, and its pyrolysis into biochar (BC) is of great significance for carbon neutrality. This study is based on bibliometrics to conduct network co-occurrence analysis on recent BC and carbon neutrality aspects, and uses the AHP + GRA dual evaluation model for index optimization evaluation. The research direction of BC in carbon neutrality in 2023 is more focused on its carbon fixation performance for carbonaceous substances. The carbon fixation index of BC accounts for 0.314 of this layer, which exceeds 30%. GRA is used to evaluate the performance of BC, with the highest correlation between η and C₀-η (1.0), followed by pore diameter, (O + N)/C, O/C, H/C, ash, SA, pore volume, C, and pH_pzc (0.696). In the process of assisting carbon neutrality with straw BC, the focus should be on carbon sequestration performance, while also considering various factors used for preparation. The aim of this study is to optimize the carbon neutrality indicators for evaluating the resource utilization process of solid waste such as straw, in order to provide a fundamental reference for decision-makers in preparing high-value products.

78. 题目: Agro-Waste-Derived Hybrid Biochar Exhibits High-Efficiency Removal of Endocrine-Disrupting Compounds
文章编号: N25041204
期刊: Water, Air, & Soil Pollution
作者: Hildegard R Kasambala, Mwemezi J Rwiza, Nelson Mpumi, Mwema Felix Mwema, Karoli N Njau
更新时间: 2025-04-12
摘要:

Poor waste management of the products and products used in water sources becomes a problem for living organisms’ health. Using biosorbent from agro-waste materials becomes the solution for waste management and wastewater treatment. This study investigated the removal of progesterone from aqueous solutions using a biochar adsorbent derived from mixed banana and mango peels. The biosorbent shows high progesterone removal of 97.8 ± 0.02% at 700℃ preparation temperature at an optimal biosorbent concentration of 0.50 g and pH of 8. Kinetic studies showed that the adsorption followed a pseudo-second-order model. Isotherm analysis revealed that the adsorption data best fitted the Freundlich model (R² = 0.96), with a maximum adsorption capacity (q_max) of 307 mg g⁻¹, indicating multilayer adsorption with a heterogeneous surface. The Brunauer–Emmett–Teller (BET) surface area was 652 m²g⁻¹ with abundant functional groups verified by Fourier Transform Infrared Spectroscopy (FTIR). The Scanning Electron Microscopy image (SEM) indicated that the biochar is porous, contributing to its effectiveness as an adsorbent. Thermodynamics results indicate that the spontaneous nature of adsorption reveals the process. The findings proved the potential of using agricultural mixed waste-derived biochar containing various chemical and physical characteristics as an effective and sustainable adsorbent to remove endocrine disruptors. This technique addresses environmental concerns about water hormone pollution and promotes sustainable waste management practices, but the gradual decrease in adsorption efficiency highlights the importance of optimizing the biochar's chemical composition and structural reliability to maximize its performance.

79. 题目: Effect of biochar addition on biogas production and humic acid formation during solid-state anaerobic digestion and subsequent aerobic fermentation
文章编号: N25041203
期刊: Journal of Environmental Chemical Engineering
作者: Qian Rong, Jie-Li Ji, Yi Li, Dan Wang, Jun Pan, Yong-Zhong Wang
更新时间: 2025-04-12
摘要: This study investigated the effects of biochar addition on biogas production and humic acid (HA) formation using a two-stage solid-state fermentation (SSF) process with rice straw and pig manure. In the anaerobic digestion phase, the addition of 10 g/L biochar enhanced biogas yield to 0.52 m³/(m³·d) with 74.56% methane content. This enhancement was achieved through dual mechanisms. Firstly, biochar facilitated lignocellulose decomposition. Specifically, it increased the cellulose degradation rate by 17.32%. Secondly, it enriched syntrophic consortia, resulting in a 21.93% increase in the abundance of Syntrophobacter. These effects were mediated by direct interspecies electron transfer (DIET). Subsequently, the addition of 15 g/L biochar to aerobic composting promoted humification, achieveing a peak HA yield of 199.30 mg/g. Optimal compost maturity parameters (germination index: 146.95%; C/N: 0.41; NH₄⁺-N/NO₃^--N: 0.37) were attained by regulating the functional microbial community to coordinate humification, nitrogen fixation, and nitrification. The cascade system further enhanced microbially mediated nitrogen retention, resulting in a 23.08% reduction in nitrogen loss. This integrated approach enabled simultaneous biogas production and HA-enriched soil amendment generation. This study achieved effective treatment of a portion of agricultural waste through biochar preparation (via corn stover pyrolysis) combined with anaerobic digestion. Subsequent aerobic composting of the digestate enhanced waste valorization, overcoming traditional digestate management challenges and reducing environmental impacts.

80. 题目: Dominance of adsorption over release: Microplastics’ impact on sediment dissolved organic matter dynamics
文章编号: N25041202
期刊: Journal of Environmental Chemical Engineering
作者: Haoxuan Zhao, Xiaowen Li, Xinyu Li, Wengang Yan, Changqing Liu, Yihua Xiao
更新时间: 2025-04-12
摘要: Microplastics (MPs) are pervasive contaminants in aquatic ecosystems, accumulating in sediments and influencing ecological and biogeochemical processes. While MPs are known to both adsorb and release sediment dissolved organic matter (SOM), the relative dominance of these processes remains unclear. This study investigates the impact of MPs on the quantity and chemical composition of SOM through a 30-day dark incubation experiment using polystyrene (PS) MPs of three different sizes (10, 100, and 1000 µm). Our results demonstrate that adsorption dominates over release, fundamentally altering SOM dynamics. PS significantly reduced chromophoric and fluorescent SOM, with smaller MPs (10 µm) causing the greatest reductions—24.2% and 15.1%, respectively. Spectroscopic analyses revealed decreases in aromaticity, molecular weight, and humification degree of SOM in the presence of PS, indicating selective adsorption of highly aromatic and humified SOM fractions. Parallel factor analysis identified four humic-like and one protein-like component, with larger MPs (1000 µm) uniquely increasing the protein-like fluorescence intensity after 30 days. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy further confirmed the chemical modifications of MPs surfaces due to SOM adsorption. These findings underscore the critical role of MPs as adsorbents rather than sources of SOM, with smaller MPs exhibiting stronger adsorption effects. However, this study was conducted under controlled conditions with a single MP type. Future research should explore diverse MP compositions and environmental factors to better assess the ecological implications of MPs on SOM dynamics.