论文检索

总访问量：4109470次

总访客量：170630人

所有论文

21. 题目: Thiol-engineered biochar for cadmium adsorption: microwave-assisted CS₂ modification and multiscale mechanisms
文章编号: N25121304
期刊: Separation and Purification Technology
作者: Xueyu Cheng, Jie Ma, Xingru Wang, Zhaolin Du, Wanli Lian, Xuefeng Liang, Qingqing Huang, Hongan Chen, Yuebing Sun
更新时间: 2025-12-13
摘要: Sulfur-modified biochar (S-BC) enables efficient cadmium (Cd) wastewater remediation, yet its molecular adsorption mechanisms remain incompletely understood. This study reveals multiscale mechanisms of Cd(II) capture by a novel CS2-modified coconut shell biochar (CS2-CSBC), synthesized via microwave-assisted sulfurization—a noncorrosive method achieving rapid heating under RSM optimization. Its maximum Cd(II) adsorption capacity reached 62.23 mg g−1 (at pH 7.0 for 12 h), 4.5 times higher than pristine biochar. Structural characterization and density functional theory calculations identified CSBC–S− as the dominate site for stable Ssingle bondCd coordination, evidenced by strong binding energy (ΔE = −23.88 kcal mol−1), charge transfer (0.60 e), and covalent interaction (−0.605 a.u.2). CSBC–O−–S−/CSBC–COO−–S− synergistically couples covalent selectivity with robust complexation. The nonideal competitive adsorption–Donnan model confirmed thiol sites progressively outcompeted carboxyl/phenolic sites for Cd(II) adsorption, achieving >95 % selectivity at high pH. Additionally, CS2-CSBC maintained good regeneration efficiency and strong potential for practical water remediation applications. These findings provide molecular-level insights into sulfur-containing functional groups for Cd(II) capture and establish a theoretical basis for designing advanced, efficient, and eco-friendly engineered biochar remediation materials.

22. 题目: Synergistic effect of iron and nitrogen co-doping on the performance of biochar for enhanced removal of pollutants from wastewater
文章编号: N25121303
期刊: Environmental Research
作者: Yinuo Zhang, Yaqun Ni, Shuyu Sun, Huanxin Zhang, Qiang Kong, Jiwei Liu
更新时间: 2025-12-13
摘要: Biochar (BC) is recognized as an excellent environmental carbon-based material for the elimination of organic contaminants and heavy metals from wastewater because of its effectiveness and low production cost. In order to further enhance the performance of BC, iron and nitrogen co-doping has emerged as an effective strategy to modify its electronic structure, thereby improving electron transfer ability, generating abundant active sites, and conferring magnetic properties. Consequently, iron and nitrogen co-doped BC (Fe/N@BC) has been successfully developed and widely applied in the elimination of organic contaminants and heavy metals from wastewater. However, there is currently no comprehensive review addressing the preparation methods, characterization, applications in the elimination of organic contaminants and heavy metals from water, and underlying removal mechanisms of Fe/N@BC. Therefore, this paper elaborates on the fabrication approaches and characterization technologies employed for Fe/N@BC. Additionally, this work explores the applications of Fe/N@BC for the adsorption and degradation of organic pollutants, as well as the sequestration of heavy metals, including its removal performances, the influences of key parameters on the removal efficiency, its removal mechanisms for organic contaminants and heavy metals from water (such as adsorption, precipitation, reduction, and activation oxidation), and the evaluation of its reusability in wastewater treatment. Finally, this review proposes future perspectives, such as the exploration of Fe/N@BC’ preparation methods, expansion of its environmental applications, and assessment of its potential risks. In summary, this review aims to deepen the understanding of Fe/N@BC and promote its practical applications in wastewater treatment.

23. 题目: Optical and biomarker indicators reveal contrasting saltmarsh and riverine contributions of terrigenous dissolved organic carbon
文章编号: N25121302
期刊: Limnology and Oceanography
作者: Joshua P Harringmeyer, Karl Kaiser, Ge Yan, Matthew W Weiser, Xiaohui Zhu, Nilotpal Ghosh, Cédric G Fichot
更新时间: 2025-12-13
摘要: Dissolved organic carbon (DOC) in the coastal ocean originates from multiple sources that differ in composition and reactivity, influencing their fates in the ocean. The diffuse export of coastal marsh‐derived DOC remains poorly quantified, creating uncertainties in ocean carbon budgets. A major challenge is identifying marsh‐derived DOC within heterogeneous mixtures in coastal waters. Here, we introduce a new multivariate framework to partition terrigenous DOC (tDOC) into saltmarsh‐derived and riverine fractions in nearshore and coastal waters, focusing on the northern Gulf of Mexico. The approach integrates ratios of cinnamyl (C), vanillyl (V), and p ‐hydroxyphenyl (P) dissolved lignin phenols (C/V and P/V) with salinity and other compositional indicators of tDOC (spectral slope coefficient, S 275–295 , and carbon‐normalized yield of lignin phenols carbon, TDLP 9 ‐C) to quantify DOC contributions from riverine, marsh, and marine sources. Implementation of the source framework revealed that nearshore tDOC was dominated by riverine inputs near the Mississippi and Atchafalaya river deltas, whereas saltmarsh‐derived tDOC was prevalent near the marsh‐dominated Terrebonne Bay. Offshore, tDOC comprised a small but non‐negligible fraction (< 20%) of the DOC pool, with ~ 90% derived from rivers, and ~ 10% from saltmarshes on average. This study provides a novel framework for quantifying the contributions of marsh‐derived and riverine DOC in coastal waters, advancing understanding of their roles in coastal carbon budgets.

24. 题目: Influence of management practices on soil organic matter composition evaluated by complementary analytical techniques: XANES and mass spectrometry
文章编号: N25121301
期刊: Soil and Tillage Research
作者: Peter K Leinweber, Riffat Rahim, Edyta Hewelke, Tom Regier, Jerzy Weber
更新时间: 2025-12-13
摘要: The impact of soil management practices on carbon (C) sequestration in soil organic matter (SOM) is insufficiently known. We studied relevant treatments, including manure application, legumes incorporation, their combination, conventional and no-tillage systems, as well as tillage with and without catch crops, at three long-term experimental sites in Poland. Bulk soil and humin fractions were analyzed by X-ray absorption near edge structure (XANES) spectroscopy and thermochemolysis-gas chromategraphy/mass spectrometry (TC-GC/MS). XANES and TC-GC/MS revealed treatment-specific molecular enrichments. Legume cropping enhanced total organic carbon (TOC) and enriched aromatic and aliphatic C structures, particularly at Skierniewice, contributing significantly to SOM stabilization. At Chylice, no-tillage preserved a higher aromatic C content, indicating a contribution of relatively stable compounds to SOM enrichment. At Swojec, the application of catch crops resulted in a balanced C profile with aliphatic C enrichments. Humin consistently exhibited greater aromatic and carboxylic C intensities compared to bulk soil, emphasizing its role as a relatively stable C reservoir. The findings demonstrate that for comparable climatic and soil conditions, no-till management is more efficient in enriching relatively recalcitrant aromatic SOM than the addition of organic matter through manure and legumes. No-till is therefore recommended as a first, immediately effective measure for SOM enrichment under Central European conditions.

25. 题目: How does wheat straw-derived biochar influence the nutrient pool of a site-specific Luvisols in a laboratory incubation?
文章编号: N25121212
期刊: Journal of Environmental Quality
作者: Syazwan Sulaiman, Guillermo Hernandez-Ramirez, Namasivayam Navaranjan, Zohrah Sulaiman
更新时间: 2025-12-12
摘要: The impact of biochar on soil nutrient pool has been well-studied in degraded and acidic soils, yet its effects in fertile soils such as Luvisols remain underexplored. To address this, two laboratory incubation experiments were conducted using biochar derived from wheat straw (Triticum aestivum)-Experiment 1 evaluated biochar produced at three pyrolysis temperatures (350°C, 500°C, and 650°C) with two residence times (1 and 2 h), whilst Experiment 2 examined the feasibility of different application rates (5 or 10 Mg ha-1) and placements (thorough mixing or surface broadcast). Biochar significantly increased exchangeable Ca, K, Mg, and Na concentrations compared to both control and straw-amended soils, particularly with the higher temperature biochar. Soil available P and K were enhanced two- and fivefold, respectively, compared to control and straw-amended soils. The effects on soil available N were inconsistent, with no significant improvement observed and some treatments indicating possible immobilization. Soil cation exchange capacity (CEC) significantly increased with certain biochar compared to the control but did not differ from straw-amended soil, with occasional instances where biochar led to lower CEC. Soil available N was higher with biochar application than straw. However, these did not significantly differ from the control, except for biochar produced at 500°C with a 1-h residence time. Soil available N was notably higher when biochar was surface broadcasted than when thoroughly mixed into the soil. Consequently, this study highlights the influence of biochar pyrolysis conditions on soil nutrient pool, with outcomes also linked to some extent by the application rates and placements, suggesting careful consideration of these management factors for optimal biochar benefit in Luvisols.

26. 题目: Molecular Alteration of Dissolved Organic Matter in Intertidal Sediments: The Role of Fe(II) Reoxidation
文章编号: N25121211
期刊: Environmental Science & Technology
作者: Heng Xiao, Zhe Zhou, Jiangtao Li, Shouye Yang
更新时间: 2025-12-12
摘要: Iron redox cycling is pivotal in coastal sediment organic matter (OM) processing. However, molecular-level effects of iron reoxidation on dissolved organic matter (DOM) during redox oscillations remain underexplored. This study investigated DOM transformations driven by iron reoxidation in Changjiang Estuary porewaters using controlled oxidation experiments and Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). Iron reoxidation significantly altered DOM composition and regulated nutrient (P, S, N) availability. Dissolved organic carbon (DOC) decreased by up to 37 ± 17% (initial oxidation induced 22 ± 12% loss), driven by ROS-mediated degradation and association with the precipitating iron (oxy)hydroxides. Concurrently, substantial abiotic sulfurization and nitrogen incorporation into DOM were evidenced, primarily transforming lignin- and protein-like components into new CHOS and CHONS molecular formulas. Furthermore, iron (oxy)hydroxides were associated with the formation of new, more complex polymeric structures, shifting the DOM pool toward a more aromatic and refractory composition. These findings demonstrate iron reoxidation as a key abiotic process controlling DOM fate, potentially promoting carbon sequestration and regulating nutrient availability in dynamic coastal environments, and underscoring its importance for coastal biogeochemical cycling

27. 题目: Root tissue chemistry influences the formation and composition of new mineral-associated organic matter
文章编号: N25121210
期刊: Soil Biology and Biochemistry
作者: Brian Rinehart, Joe P Noel, Justin Allen, Joeri Kaal, Dave McNear, Hanna Poffenbarger
更新时间: 2025-12-12
摘要: Interest in managing soil organic matter through plant inputs is increasing, but the role of plant litter chemistry in organic matter cycling is still debated. While roots are an important carbon input, there are conflicting findings on how root litter chemistry affects the formation and composition of organic matter across soil types. Roots of seven plant species with diverse chemical composition were incubated for six months in two soil types differing in texture and pH. Soil respiration was measured regularly and the movement of root carbon into soil organic matter fractions was tracked using carbon-13 natural abundance. In both soils, litters with high guaiacyl and syringyl lignin units had less respiration and less transformation of litter C into heavy particulate organic matter (POM) and mineral-associated organic matter (MAOM). High suberin content decreased respiration and increased the recovery of litter C in light POM, but had no effects on its transfer to heavy POM or MAOM. On the other hand, p-hydroxyphenyl lignin units had positive effects on the transformation of litter C into MAOM but limited effects on respiration or recovery of litter C in POM. The litter treatments had similar effects on litter-derived MAOM across both soils despite overall less litter C in that fraction for the coarse, low pH soil. We also found evidence of chemical changes to the MAOM, with the ratios of lignin subunits shifting towards the ratios found in the litters. Our results highlight that lignin composition, in addition to total amount, seems to shape decomposition dynamics. Our results also support the idea that microbial processing of high-quality litters facilitates stabilization of C in MAOM. However, we show that regardless of degradability roots leave a chemical imprint on MAOM, particularly through their lignin composition, suggesting that direct contributions of plant C to MAOM cannot be overlooked.

28. 题目: Calibrated Uncertainty Estimation for Soil Organic Carbon from Raman Spectra
文章编号: N25121209
期刊: Analytical Chemistry
作者: Jeffrey K Wiens, Natalia Solomatova, Sadegh Shokatian
更新时间: 2025-12-12
摘要: Machine learning (ML) is a powerful tool for inferring chemometric properties from Raman spectra, expanding the information extractable from high-dimensional spectral data. A growing application is the estimation of soil organic carbon (SOC), where ML models relate overlapping Raman and fluorescence features to chemical composition. However, these models typically lack calibrated, prediction-level uncertainty estimates that limit their utility in decision-critical contexts.

29. 题目: Urbanization Promotes Topsoil Black Carbon Accumulation: A Meta-Analysis
文章编号: N25121208
期刊: Land Degradation & Development
作者: Yu Zhao, Bingbing Li, Zhouxinnan Xu, Zhiheng Song, Songyi Huang, Min Wang
更新时间: 2025-12-12
摘要: Accelerated urbanization underscores the importance of black carbon (BC) in urban soils, a key component of soil organic carbon with implications for ecosystem function and human health. This meta-analysis systematically integrated data from 54 studies comprising 4548 sampling sites across 40 Chinese cities, supplemented by targeted field sampling, to examine the distribution, sources, and influencing factors of soil BC in urban environments. After rigorous screening, standardization, and outlier removal, correlation analysis, and multivariate statistics were applied. Results showed an average urban topsoil BC content of 6.70 ± 5.34 g/kg, with marked spatial heterogeneity: higher concentrations were observed in eastern compared to western regions, and in northern relative to southern cities. Fossil fuel combustion—primarily vehicular emissions and industrial coal burning—was identified as the dominant source of BC, while biomass burning served as a secondary contributor, with additional local inputs from urban expansion and straw burning. Among natural factors, higher precipitation in southern regions enhanced BC migration, leading to reduced concentrations. Anthropogenic factors, however, exerted a stronger influence: cities with higher urbanization levels and greater energy consumption exhibited significantly elevated BC inputs. This study provides a comprehensive understanding of BC distribution patterns and source apportionment in China's urban soils, offering scientific support for urban environmental management and soil quality improvement amid ongoing urbanization, thereby contributing to sustainable urban development.

30. 题目: Comparative assessment of biochar reactor technologies for biomass conversion: Design, performance, and application suitability
文章编号: N25121207
期刊: Journal of Cleaner Production
作者: Dipita Ghosh, Nathaniel Anderson, Han-Sup Han
更新时间: 2025-12-12
摘要: The effectiveness of biochar for ecological restoration, toxicity remediation and carbon sequestration are fundamentally dependent on the biochar production technology. This review provides a systematic comparison of thermochemical conversion techniques such as pyrolysis (slow, rotary kiln, auger-based), gasification (downdraft and fluidized bed) and hydrothermal carbonization (HTC). Key performance metrics such as temperature profile, residence time, emissions regulation, and scalability are evaluated alongside critical biochar qualities such as surface area, porosity, fixed carbon content, cation exchange capacity, and polycyclic aromatic hydrocarbon. Priority has been given to aligning the biochar produced from each reactor with their respective environmental applications based on the biochar functions, such as nutrient retention, pH adjustment, and carbon fixation. The reactor performances have been summarized in context with production capacity, capital cost, and other variables related to system selection. The review uniquely integrates technical, environmental, and agronomic factors to propose a decision framework that aligns biochar production technologies with appropriate feedstocks, logistical settings, and long-term sustainability goals. In conclusion, this interdisciplinary approach fills a gap in literature by linking reactor engineering with functional outcomes in land management and climate resilience.

31. 题目: CO2 capture by olive pomace biochar: Effect of relative humidity, isosteric heat of adsorption, and a preliminary Life Cycle Assessment investigation
文章编号: N25121206
期刊: Separation and Purification Technology
作者: J M Monteagudo, A Durán, Yansong Zhao, Jaime Monteagudo
更新时间: 2025-12-12
摘要: This study investigates the potential of olive pomace biochar, a low-cost agro-industrial byproduct, as an adsorbent for direct air capture (DAC) of CO₂. The biochar was prepared via gasification and evaluated in terms of adsorption performance, regeneration, humidity influence, thermodynamic behaviour, isosteric heat and life cycle impact. The maximum CO₂ adsorption capacity was 17.68 mg g⁻¹ at 10 °C, with stable performance maintained over five consecutive adsorption–desorption cycles, highlighting its short-term regenerability. The analysis of mass transfer mechanisms during adsorption included the application of an intraparticle diffusion model. The thermodynamic study confirmed the exothermic nature of CO₂ adsorption, with ΔH° values below 20 kJ mol⁻¹ indicating the predominance of physical adsorption. Complementary XPS and FTIR analyses further supported this mechanism, revealing only weak interactions of CO₂ with oxygenated groups and mineral species on the biochar surface. The isosteric heat analysis confirms that once the critical hydration level is reached (humidity ≈18 mmol H₂O/mol air), further humidity has no significant effect on CO₂ adsorption. The Life Cycle Assessment (LCA) showed that this system is environmentally favorable and achieves carbon-negative performance.

32. 题目: Dynamic Phosphorus Interactions at Soil Mineral–Organic Carbon Interfaces: A Critical Review
文章编号: N25121205
期刊: Environmental Science & Technology
作者: Xinfei Ge, Wenjun Zhang, Lijun Wang, Christine V Putnis
更新时间: 2025-12-12
摘要: Phosphorus (P) is a nonrenewable macronutrient essential for agriculture, yet its availability is often constrained by the formation of mineral–P associations (MPAs) at soil–mineral interfaces. Soil organic carbon (SOC), however, can dynamically transform these MPAs, mobilizing the associated P. This critical review synthesizes the interface processes and mechanisms governing the formation and transformation of MPAs, linking them to farmland P availability. We first outline the specific characteristics of minerals and P phases that lead to the formation of MPAs via adsorption and precipitation. We then introduce a novel conceptual framework in which SOC drives the transformation of MPAs through desorption and dissolution. This framework emphasizes how the specific reactive SOC compounds target mineral-associated P (MAP), with efficacy contingent on MPA inherent properties. We propose a trade-off between the formation and transformation dynamics of MPAs, which governs the legacy P pool and its varying availability. A holistic understanding of these dynamic interactions operating at mineral–organic carbon interfaces will enhance predictions of long-term P fertility and inform the development of innovative SOC-based P management strategies for sustainable agriculture and environment.

33. 题目: Strategy-dependent anammox tolerance to sulfadiazine: A cascade from EPS defense to microbial network cooperation
文章编号: N25121204
期刊: Journal of Hazardous Materials
作者: Yunjing Wang, Cong Wang, Qing Ye, Weikang Qi, Yongzhen Peng, Shujun Zhang
更新时间: 2025-12-12
摘要: Anammox are highly sensitive to antibiotic stress. However, the dynamics of electron transfer, the response patterns of key metabolic enzymes, and their molecular interaction mechanisms under different exposure strategies remain unclear. This study compared two sulfadiazine (SDZ) exposure strategies, repeated-exposure (R0-R3) and elevating-concentration (R4), to evaluate their impacts on system stability and resilience. Under R0-R3, intermittent antibiotic shocks induced cumulative inhibition, leading to specific anammox activity (SAA) and total nitrogen removal efficiency (TNRE) declining continuously. In contrast, R4 maintained TNRE above 85% even at 50 mg/L SDZ. Although SAA peaked at 1 mg/L and declined at higher concentrations, biomass accumulation largely compensated for this loss. Mechanistic analysis showed that tightly bound proteins (TB-PN) in extracellular polymeric substances (EPS) were markedly depleted from R0 to R3, disrupting electron flow and weakening key enzymatic functions. Molecular docking revealed that SDZ could bind spontaneously to key enzymes, particularly nitrite reductase (NIR). In R4, the TB-PN-dominated EPS matrix reduced SDZ binding through physical shielding and preserved catalytic activity. It also supported a coordinated defense involving EPS restructuring, electron transfer, enzyme protection, and microbial cooperation. These findings identify TB-PN as a central element of multiscale defense and provide a basis for optimizing anammox stability under antibiotic stress.

34. 题目: Microbial-driven iron transformation and carbon stabilisation in flooded soils: roles of biochar and rock weatherXu, Q., Zhang, G., Zhang, F., Bandara, T., Guo, H., Xu, M., & Tang, C. (2025). Microbial-driven iron transformation and carbon stabilisation i
文章编号: N25121203
期刊: Plant and Soil
作者: Qiao Xu, Gefeng Zhang, Feifan Zhang, Tharanga Bandara, Hongyan Guo, Meiling Xu, Caixian Tang
更新时间: 2025-12-12
摘要: Background and aims The escalating climate crisis demands innovative carbon dioxide removal strategies, with biochar and enhanced rock weathering (ERW) emerging as promising carbon-negative solutions. However, their contrasting effects on iron (Fe) (hydr)oxide-organic carbon (OC) interactions, a key mechanism underlying mineral-mediated C persistence, remain poorly understood. Methods A pot experiment examined the effects of biochar and enhanced basalt weathering alone and in combination on Fe oxide phases, C-binding capacity, Fe-complexed OC characteristics, and shifts in Fe-oxidising and reducing microbial communities via 16S rRNA sequencing in a paddy soil. Results The Biochar and the Dual treatments consistently transformed Fe mineral, reducing organo-complexed Fe (FePP) by 26%–29%, while increasing amorphous Fe by 22%–41%. These shifts elevated C bound to FePP by 25%–28% with reduced aromaticity and the OC-to-Fe molar ratio by 73%–76%. Basalt alone generated the highest Fe-bound OC fraction (Fe-OC%, 26.2%), where biochar maximised SOC (+ 61%) but diluted Fe-OC% (16.6%). The Dual treatment enriched Fe-cycling bacteria, most notably stimulating Geobacter (21-fold) and Desulfosporosinus (> 120%), and achieved the highest Fe-OC% (27.6%) after adjusting for biochar-C inputs. Conclusion The findings demonstrated that biochar prioritised SOC quantity and stability via direct recalcitrant C retention and stabilisation of labile C on residual Fe (hydr)oxides, while ERW enhanced Fe-bound OC persistence through organo-mineral associations without C gain. The strategic integration of biochar and basalt enhances both C stocks and stability, offering a practical route to improve C sequestration in anaerobic agroecosystems.

35. 题目: Remediation of Water Contaminated by Toxic Metals with Multi-metal/Co-doped Modified Biochars
文章编号: N25121202
期刊: Water, Air, & Soil Pollution
作者: Ghulam Murtaza, Muhammad Usman, Zeeshan Ahmed, Muhammad Qasim, Javed Iqbal, Shabir Ahmad, Rashid Iqbal, Lala Gurbanova, Mehdi Rahimi
更新时间: 2025-12-12
摘要: The presence of high levels of heavy metals in the environment is a significant environmental issue that endangers both the environment and human health. The problem is mostly caused by water contamination from toxic heavy metals, which can have detrimental effects such as ecosystem destruction, disease transmission, and contamination of drinking water. Biochar shows great potential as an environmentally friendly adsorbent for the removal of toxic metals from wastewater. It is obtained from a range of biomasses, such as organic wastes and agricultural residues, and possesses a significant amount of carbon level, stability, and surface area. Biochar possesses features that allow it to efficiently eliminate toxic metals using adsorption and cation exchange. This article provides a concise overview of the latest developments in the modification of wood and non-woody biomass-derived biochar with multi-and mono metals and organic substances to improve its ability to adsorb toxic metals. The article explores the benefits, uses, difficulties, and future possibilities of this approach. Biochar-naturalized advanced oxidation processes (AOPs) have demonstrated potential in heavy metal complexes decomposition and increasing the ability to adsorb free metallic ions in industrial effluent/wastewater. Biochar is a reusable substance, which makes it more environmentally friendly compared to substitutes. The article also identifies areas where research is lacking and limitations of using mono-multi metal or organic agent-modified biochar derived from wood and non-wood biomass for water treatment of toxic metals. It also suggests potential areas for further research. Subsequent studies should prioritize the advancement of ecologically sustainable and economically efficient technologies to expand the use of biochar for removing heavy metals.

36. 题目: Adsorption of Bisphenol A by Modified Suaeda Biochar: Adsorption Properties and Mechanism
文章编号: N25121201
期刊: Water, Air, & Soil Pollution
作者: Di Liu, Yanrong Cai, Xuechun Yu, Huiyao Tian, Weili Jiang, Qiong Wang
更新时间: 2025-12-12
摘要: Bisphenol A is a persistent endocrine disrupting chemical that can induce the death of related hormones in the body. Using Suaeda glauca as raw material, 800-SBC was prepared by pyrolysis method. Fe modification biochar(Fe-SBC) and Mg-Fe bimetallic modification biochar(Mg-Fe-SBC) were prepared and used to remove bisphenol A(BPA) from the wastewater. The adsorption capacities of the two biochar for the BPA can reach 24.60 and 42.36 mg/g. FeO(OH) was formed in the Fe-SBC and metal complexation reaction occured between Fe and BPA during the adsorption. MgFeO4 and Fe3O4 were formed in the Mg-Fe-SBC and the weak saturation magnetization of Mg-Fe-SBC was 1.616 emu/g. The adsorption mechanisms of two types of biochar may include pore filling, metal complexation, and π-π conjugation and hydrogen bonding. The Langmuir isotherm model and pseudo second order kinetic model have better fitting effects on the adsorption process. The adsorption process was a single-layer chemical adsorption. The thermodynamic results showed that all adsorption processes were spontaneous, endothermic and chaotic reactions.

37. 题目: Occurrence and Potential Influencing Factors of Bioavailable Organic Phosphorus in Sediments of Typical Shallow Lakes in the Yangtze River Basin
文章编号: N25121109
期刊: Journal of Environmental Chemical Engineering
作者: Yajie Yang, Sainan Sun, Haibin Li, Xing Chen, Guannan zhou, Jiamei Zhang, Gege Cai, Guolian Li, Yun Liu, Yuyang Zhu, Fazhi Xie
更新时间: 2025-12-11
摘要: Organic phosphorus (P_o) in sediments is often overlooked as a component in lake internal phosphorus (P) due to its complexity of composition, bioavailability, and environmental processes. This study focuses on Nanyi Lake, a typical shallow lake in the lower reaches of the Yangtze River, to characterize the occurrence of bioavailable P_o in sediments and to assess the potential roles of the structure and sources of dissolved organic matter (DOM) and phytoplankton biomass in influencing the occurrence of bioavailable P_o. Sequential extraction combined with enzymatic hydrolysis revealed that bioavailable P_o in sediments was mainly composed of monoester and diester phosphorus (monoester/diester-P). The average content of enzymatically hydrolyzable P_o in the eastern lake region (36.96 mg/kg) was higher than that in the western region (30.48 mg/kg), with the most pronounced spatial variation observed in NaHCO₃-P_o (eastern lake 10.8 mg/kg > western lake 6.2 mg/kg). UV-visible absorption spectra showed that the structure of DOM in NaHCO₃-P_o became m_ore stable from west to east, which delayed the enzymatic release of P_o. Three-dimensional fluorescence spectroscopy showed that DOM in NaHCO₃-P_o mainly originated from terrestrial input, with inflowing rivers in the eastern region contributing to high humification. This DOM inhibited diester-P degradation via adsorption and complexation, leading to its accumulation from west to east in the lake (2.88 to 7.2 mg/kg). This study characterized the occurrence of bioavailable P_o and assessed its potential influencing factors. The findings provide insights into internal phosphorus loading and targeted pollution control in lakes.

38. 题目: Long-term natural photodegradation of plastic films enhances the molecular complexity of plastic-derived dissolved organic matter
文章编号: N25121108
期刊: Water Research
作者: Derong Zhang, Jiwei Luo, Xue Li, Dongming Wu, Yanhai Xie, Hui Zeng, Hui Deng, Qingmian Chen, Chengjun Ge, Ying Zhang
更新时间: 2025-12-11
摘要: Plastic debris contributes substantially to the marine carbon pool by continuously releasing dissolved organic matter (DOM) through photodegradation. However, the long-term influence of intrinsic plastic properties on the composition of plastic-derived DOM (PDOM) remains poorly understood. Here, we conducted a three-year field exposure experiment using five representative plastics (PBAT, PE, PO, PP, and PS) under natural sunlight to investigate the molecular characteristics of PDOM. Results showed that PBAT released the highest PDOM concentrations (1075.33 ± 14.67 mg L⁻¹), over 14 times higher than those of the other plastics (< 73.86 ± 1.52 mg L⁻¹). The release of PDOM was governed by both polymer composition and irradiation duration. Short-term dissolution of plastic fragments generated highly bioavailable compounds, whereas long-term photodegradation involved extensive oxidation and molecular recombination, leading to marked changes in chemical properties and structural complexity, and ultimately increasing PDOM heterogeneity. These findings highlight the decisive role of polymer type in regulating the quantity, composition, and photo-reactivity of PDOM, providing new insights into DOM dynamics in marine environments.

39. 题目: Link Between Soil Organic Carbon and Microbial Soil Health Indicators in Arable Fields: Management and Spatial Drivers
文章编号: N25121107
期刊: European Journal of Soil Science
作者: Jarinda Viaene, Paul Quataert, Lisa Joos, Caroline De Tender, Jane Debode, Bart Vandecasteele
更新时间: 2025-12-11
摘要: The EU aims to harmonise soil health monitoring across Member States with the Soil Monitoring Law. Selection of appropriate soil health indicators remains a key challenge, however. Total organic carbon (TOC) content, a key factor in soil health, may be related to indicators of microbial soil health. The aim of this study was to assess the relationship between various microbial soil health indicators and TOC in the topsoil of arable fields in Flanders (northern Belgium). Carbon (C) input from exogenous organic matter (C input) was also explored as a proxy for TOC. Four microbial soil health indicators were examined: (1) Hot‐water extractable C (HWC), (2) Total biomass according to phospholipid fatty acid analysis (PLFA), (3) Bacterial (DivB) and (4) Fungal (DivF) Shannon‐Wiener diversity. Five medium‐ to long‐term field trials with different field histories and spatial variability were selected based on different C inputs. Results showed that both TOC and C input were good predictors for HWC and PLFA. A positive relationship between C input and TOC was found. This supports the use of C input as a practical proxy for monitoring TOC changes in soils (e.g., for carbon farming and soil health assessments). Significant within‐field spatial variability was observed for TOC, HWC and PLFA, suggesting that spatial differences in soil health assessments should be addressed via sampling design. DNA‐based indicators (DivB and DivF) were less influenced by spatial or management factors and also correlated weakly with TOC. These findings highlight the complex interplay among field history, current management and spatial variability when determining soil health.

40. 题目: Decomposition causes short-term increases in functional molecular diversity of dissolved organic matter
文章编号: N25121106
期刊: Nature Communications
作者: Rachelle E Davenport, Marie E Kroeger, Nikoli Tolić, Jason G Toyoda, Rosalie K Chu, Sophie Lehmann, Chaevien S Clendinen, Benjamin P Bowen, David G Rossiter, Daniel H Buckley, Johannes Lehmann
更新时间: 2025-12-11
摘要: The molecular diversity of dissolved organic matter (DOM) in soil depends on the stage of plant litter decomposition and microbial metabolism. Yet the contributions of catabolic and anabolic processes on DOM molecular diversity, and their consequences for organic carbon mineralization, remain unclear. To address this question, we used an 18O-H2O isotope-labelling approach to track microbial transformation of DOM during blue grama grass (Bouteloua gracilis) decomposition and determine how these processes alter molecular diversity. Here, we show that 18O-isotopically labeled compounds indicate that microbially produced DOM increases functional molecular diversity (recognizing compound dissimilarity) during early decomposition (days) but not at later stages (months). Furthermore, carbon mineralization from DOM is most strongly correlated with molecular weight, highlighting the role of chemical properties in regulating microbial decomposition. Our findings suggest that early microbial catabolic and anabolic metabolism enhances DOM molecular diversity, whereas later decomposition favors the accumulation of fewer, recycled microbial compounds.