1. 题目: Review of Decisive Factors for Controlling Generation and Environmental Effect of Dissolved Organic Matter from (Micro)plastics 文章编号: N25111725 期刊: Journal of Hazardous Materials 作者: Xinrui Zhang, Taishuo Zhang, Jiatong Zhang, Houpu Ren, Haiyu Zhang, Jiayu Zhang, Yiping Guo, Tianjiao Xia, Peng Liu, Hanzhong Jia 更新时间: 2025-11-17 摘要: Plastic-derived dissolved organic matter (DOM) is extensively generated in parallel with the increase of plastic waste, and its potential environmental risks are attracting increasing attention. This review first summarizes the unique compositions, structures and features of plastic-derived DOM. Then, the crucial factors controlling DOM generation from plastics are identified. Additionally, the important role of plastic-derived DOM in biogeochemical processes such as the photodegradation of other pollutants and carbon sources for microorganisms is specifically discussed. Through correlation analyses on data extracted from previous publications, illumination is identified as the most dominant factor over other factors (e.g. temperature, physical abrasion and oxygen) for affecting the generation of plastic-derived DOM. In addition, the generation potentials of DOM among various plastic types are revealed, with the orders following PS > PU > PP > PA > PE > PET > PC > EVA > PMMA > PVC, whose differences are mainly related to the associated functional groups (C6H6 and C=O) and unsaturated bonds (-CH=CH2 and C=O). Moreover, the threshold concentration of plastic-derived DOM on pollutant transformation is determined as 20 mg C/L, where plastic-derived DOM exhibits the enhancing effect when exceeding the threshold value. This review contributes to a deeper understanding of plastic-derived DOM, thereby providing more accurate basis for risk assessment and pollution control strategies for plastic waste in natural ecosystems.
2. 题目: Effects of Biochar Amendment on the Fate of 17β-Estradiol in Agricultural Soil: Insights from 14C-Tracer Studies on Mineralization, Transformation, and Non-Extractable Residue Formation 文章编号: N25111724 期刊: Journal of Hazardous Materials 作者: Xianjin Lan, Xuan Wu, Jun Shan, Yongfeng Wang, Lili Tian, Lianhong Wang, Rong Ji 更新时间: 2025-11-17 摘要: While biochar (BC) is proposed to mitigate estrogen-associated ecological risks in soil, its effects on estrogen fate remain obscure. We studied mineralization, transformation, and non-extractable residue (NER) formation of 17β-estradiol (E2) in sterilized soil and active soil with 0%, 0.1%, and 1% BC amendment under oxic conditions for 42 days. E2 dissipated rapidly in the active soil (half-life = 1.5 days), mainly forming NERs (65 ± 1% at the end of experiments) or mineralized (11.1 ± 0.4%), with generation of minor extractable residues containing estrone (2.0 ± 0.2%) and one unknown biotransformation product TP (2.5 ± 0.2%). E2-derived NERs were formed mainly via physico-chemical entrapment (59 ± 3% of the total NERs) and were associated with humin fraction (66 ± 3% of the total NERs). BC application had no significant effect on E2 mineralization, transformation into estrone and TP, and NERs quantity, but significantly promoted the formation of physico-chemical entrapped NERs and fulvic acids-bound NERs at 0.1% level, while increasing BC level might increase the formation of humic acids-bound NERs. Our findings highlight a critical role of NERs in determining environmental risk of E2 and suggest that BC application may not be effective strategy for mitigating estrogen contamination in soil.
3. 题目: Dissolved organic matter proxies for tracing microplastics and phthalates in urbanized rivers: Fluorescence and molecular insights 文章编号: N25111723 期刊: Journal of Hazardous Materials 作者: Yuanyuan Cao, Yang Liu, Shibao Liu, Mengxin Han, Huaming Guo, Wenxin Liu 更新时间: 2025-11-17 摘要: Widely distributed in aquatic environments, emerging contaminants including microplastics (MPs) and phthalates (PAEs) necessitate efficient tracing proxies. We propose dissolved organic matter (DOM) proxies as effective indicators of the occurrence and potential anthropogenic effects of MPs and PAEs in the Haihe River (China), with validation in multiple global urbanized rivers. Fluorescence subtraction revealed that wastewater discharges increased protein-like DOM (C2) while decreased humic-like DOM (C1), establishing C2/C1 ratio as a universal wastewater proxy. Principal component analysis demonstrated two major sources of DOM: terrestrial-sourced DOM (i.e., surface runoff) and anthropogenic-sourced DOM (i.e., wastewater discharge). DOM proxies (C2/C1, C2%, and BIX) were well correlated with MPs and PAEs. Molecular-level analyses showed elevated levels of sulfur-containing compounds/aliphatics and reduced carboxyl-rich alicyclic molecules (CRAM) downstream of wastewater outlets. MPs and low-molecular-weight PAEs were closely associated with environments rich in protein and aliphatic compounds and poor in humic-like substances (with high C2/C1 and low HIX), suggesting higher ecological risks. High-molecular-weight PAEs were associated with environments rich in humified compounds. Multivariate linear regression confirmed significantly positive correlations (p < 0.001) between C2/C1 and both MPs and low-molecular-weight PAEs, which were validated across multiple global urbanized rivers. Overall, this work identified DOM proxies (particularly C2/C1) as reliable and effective tracers of plastic-derived contaminants (MPs and PAEs), providing a low-cost screening tool for ecological risk assessment and targeted monitoring in urbanized rivers.
4. 题目: Heteroatom-engineered humic acid-derived porous carbon for selective uranyl ion capture: Synergistic activation mechanism, dual-doping effects, and enhanced adsorption performance 文章编号: N25111722 期刊: Separation and Purification Technology 作者: Baochuan Qi, Jianxing Wang, Haoran Sun, Yarui Song 更新时间: 2025-11-17 摘要: Although capacitive deionization (CDI) technology shows promising potential for removing uranyl ions from wastewater, the performance of electrode materials remains a critical bottleneck. Herein, the heteroatom-engineered porous carbon derived from humic acid was synthesized through a facile one-step co-pyrolysis strategy using potassium citrate and 2-[N-morpholino] ethanesulfonic acid potassium salt as synergistic activators and dopants. The pyrolysis process involves three critical stages: initial decomposition, pore formation, synergistic activation, heteroatom doping, and structural stabilization. The optimized nitrogen‑sulfur co-doped humic acid-derived porous carbon demonstrates exceptional performance in uranyl ion capture, achieving a maximum Langmuir adsorption capacity of 811.85 mg·g−1 and remarkable selectivity, with a distribution coefficient () exceeding 104 mL·g−1. Mechanistic investigations indicated that electrosorption is governed by electric double-layer formation, supplemented by coordination between doping atoms and partial reduction effects. Density functional theory calculations further confirm that horizontally adsorbed uranyl molecules exhibit higher binding energies than vertically oriented molecules. This study provides insights into not only the synergistic activation and dual-doping mechanisms of biomass carbon-based electrodes but also their applications in uranium recovery using membrane capacitive deionization.
5. 题目: Study on PFAS removal by different forms of iron-modified biochar: adsorption effects and catalytic activity 文章编号: N25111721 期刊: Journal of Environmental Chemical Engineering 作者: Binglu Teng, Zhenhua Zhao, Jiangxuan Wu, Liling Xia, Yuanchi Wang, Jiayuan Cheng, Wenqing Zhang, Hailong Wang 更新时间: 2025-11-17 摘要: Iron-modified biochar has been investigated as an adsorbent and catalyst for the removal of per- and poly-fluoroalkyl substances (PFAS) from wastewater. However, the influence of different forms of iron-modified biochar on the adsorption effect and catalytic activity of PFAS is unclear. This study prepared four distinct forms of biochar: Fe0/BC, Fe₂O₃/BC, Fe(OH)₃/BC, and Fe₃O₄/BC. Their adsorption capacities for PFOS, PFOA, PFHxA, PFBA, and PFBS were compared. The catalytic activity towards peroxymonosulfate (PMS) and the contribution made by reactive radicals were investigated. The results showed that for long-chain PFAS, all three biochar samples except Fe(OH)3/BC showed high adsorption capacity. For short-chain PFAS, the adsorption capacities of Fe2O3/BC and Fe3O4/BC were much higher than those of the other two biochar types. Fe3O4/BC showed better catalytic activity for PMS activation. SO4·− and ·O2- played a major role in the whole PFAS removal process, and ·OH contributed less to PFAS removal. Fe3O4/BC is an eco-friendly, low-cost, and highly efficient adsorbent material and catalyst with excellent recycling ability. It has good application prospects for removing PFAS contamination from water, especially for short-chain PFAS, and has more advantages than other forms of iron-modified biochar.
6. 题目: Water table-driven divergent patterns and drivers of particulate and mineral-associated organic carbon in alpine peatlands 文章编号: N25111720 期刊: Catena 作者: Han Zheng, Mengjie Liu, Houkun Chu, Paul P J Gaffney, Junxiao Pan, Quan-Cheng Wang, Yang Li, Dashuan Tian, Ruiyang Zhang, Ronglei Zhou, Ning Liu, Fei Wu, Jian Hu, Lei Ma, Shuli Niu, Jinsong Wang 更新时间: 2025-11-17 摘要: Classifying soil organic carbon (SOC) into particulate organic carbon (POC) and mineral-associated organic carbon (MAOC) can enhance the understanding of SOC vulnerability to environmental changes. However, the spatial patterns and drivers of POC and MAOC in peatlands remain poorly documented. Here, we collect topsoil samples (0–20 cm) from 43 representative sites exhibiting varying water table levels across the Zoige Plateau, the world’s largest alpine peatland. The mean value of POC and MAOC was 131.71 g kg soil−1 and 92.75 g kg soil−1, respectively, with POC dominating the SOC contribution (58.4 %) in alpine peatlands compared to other terrestrial ecosystems. Multiple linear regression and random forest analyses identified SOC, soil total nitrogen, and lignin phenols as primary determinants of POC variation, whereas MAOC variation was mainly explained by SOC, iron-bound carbon, and non-crystalline iron oxides. Spatial predictions based on random forest models indicated that POC stocks (mean: 8.25 kg m−2) increased from southeast to northwest, whereas MAOC stocks (mean: 5.53 kg m−2) were higher in southeast on the Zoige Plateau. Rising water tables increased both POC stocks and their contribution to SOC, while declining water tables enhanced the contribution of MAOC stocks to SOC but reduced total SOC stocks. Our findings highlight divergent patterns and drivers of SOC fractions at large scales in alpine peatlands, provide evidence of how water table fluctuations influence their relative contributions to SOC stocks, and offer valuable insights into soil carbon formation and stability in these cold, climate-sensitive peatland ecosystems.
7. 题目: Wildfires Impact the Thermal Stability and Molecular Composition but Not the Age of Dissolved Organic Carbon Exported by Northern Streams 文章编号: N25111719 期刊: Journal of Geophysical Research: Biogeosciences 作者: Leonardo Mena‐Rivera, Joshua F Dean, Mark H Garnett, Amy D Holt, Amy E Pickard, Roxane Andersen, Edward Graham, Jack Bishop, Robert G M Spencer, Christopher D Evans, Robert G Hilton 更新时间: 2025-11-17 摘要: Understanding how wildfires impact the biogeochemistry of dissolved organic matter (DOM) in peatland catchments is important for predicting how they may respond to climate change. However, the net effects of wildfires on the composition of DOM are not yet well understood. We investigated how fire changes the age, thermal stability, and molecular composition of stream DOM in blanket peatlands in the Flow Country and the Isle of Lewis, North of Scotland. Radiocarbon measurements showed that stream DOC was predominantly modern in both bulk and ramped thermal fractions with no apparent change observed due to wildfires. Ramped thermal oxidation revealed higher thermal stability of stream DOM in wildfire impacted areas, as demonstrated by higher activation energies, a proxy for organic C bond strength. This was prominent between 350 and 470°C and was also associated with an increase in the content of thermally stable C and a reduction in bond diversity. Using ultra high‐resolution mass spectrometry, we found an increase in the molecular diversity of DOM and in the relative abundance of highly unsaturated and phenolic class. There was also a higher relative abundance of highly oxygenated N‐ and S‐containing formula, potentially from partially combusted plant and soil material, which could explain the shift in activation energy. Together, our results demonstrate ways that wildfires can impact the reactivity and composition of DOM, with implications for its stability and residence time along the terrestrial‐aquatic continuum.
8. 题目: Benefits of sewage sludge biochar for soil health: evidence from a seven-year field study in tropical soil using comprehensive approaches 文章编号: N25111718 期刊: Journal of Soils and Sediments 作者: José Ferreira Lustosa Filho, Cícero Célio de Figueiredo, Ieda de Carvalho Mendes 更新时间: 2025-11-17 摘要: Purpose The role of biochar in soil health has been extensively researched, often focusing on biological indicators alone or in combination. However, the use of integrated tools that dynamically connect enzymes to soil organic carbon (SOC) remains limited. As waste recycling becomes increasingly essential for sustainable environmental management, this study aimed to evaluate the effects of sewage sludge biochar application on soil health. Methods This study utilized integrative methodologies involving the four-quadrant model (4QM) approach and the soil bioanalysis (SoilBio) technology in a seven-year field study. At the end of the seventh maize crop, soil samples were collected from the 0–10 cm layer. The enzymatic activities of β-glucosidase (GLU) and arylsulfatase (ARYL), SOC, and chemical properties of the soil were determined. The 4QM and the soil quality index (SQIFERTBIO) were estimated based on chemical and biological properties. Results Results showed that the combined application of biochar and mineral fertilization (NPK) significantly increased GLU activity and SOC content, whereas ARYL activity was less responsive. The SQIFERTBIO and related soil functions (nutrient cycling and storage) improved under biochar treatments. In the 4QM framework, only GLU activity distinguished soil health states, effectively separating biochar-amended soils from the control and NPK treatments. Cumulative maize yield over seven years was higher with biochar + NPK than the control, but similar to NPK alone. Conclusion These findings highlight the long-term legacy effects of biochar on soil biological health and productivity. Integrative assessment tools, such as 4QM and SQIFERTBIO, proved effective in capturing these improvements and provide a practical framework for soil health monitoring.
9. 题目: Significant influence of terrestrial input on organic matter accumulation in the lower Cambrian Shuijingtuo Formation of South China 文章编号: N25111717 期刊: Palaeogeography, Palaeoclimatology, Palaeoecology 作者: Huan Liu, Yaowen Wu, Shangli Liu, Xintao Wang, Hui Tian 更新时间: 2025-11-17 摘要: The lower Cambrian black shales in the middle Yangtze Block represent a pivotal target for marine shale gas exploration in South China. Although primary productivity and preservation are well-established controls on organic matter (OM) enrichment in the Shuijingtuo (SJT) Formation, the role of terrestrial input is poorly understood. This study investigates the mechanisms governing OM enrichment by integrating high-resolution elemental, organic carbon isotopic, and petrological data from Well ZD2 (Yichang area) with published regional data from wells and outcrops. The SJT Formation is subdivided into three members: the lower (dominantly siliceous shale, average total organic carbon (TOC) = 5.76 %), middle (mainly mixed shale, average TOC = 1.99 %), and upper (primarily calcareous shale, average TOC = 0.75 %). The positive correlations between TOC content and proxies for productivity (Cu/Al, Ni/Al, and Zn/Al) and redox conditions (MoEF, UEF, VEF, U/Th, V/Cr, and Ni/Co) indicate that OM enrichment was predominantly controlled by high primary productivity and anoxic preservation conditions. However, a progressive increase in TOC content from nearshore to basin, observed under comparable productivity and preservation conditions, cannot be fully explained by these two factors alone. A marked decrease in TOC content from the lower to middle members correlates with enhanced terrestrial weathering, as indicated by the Chemical Index of Alteration (CIA), suggesting that terrestrial dilution exerted a specific control on OM accumulation. These findings highlight terrestrial dilution as an important, yet previously underestimated, mechanism governing OM accumulation. In contrast, within the upper member, terrestrial input appears to have promoted OM enrichment. Nevertheless, the overall low TOC content across the shelf, coupled with minimal spatial variability, is attributed primarily to oxygenated water column conditions and diminished primary productivity. In summary, this study elucidates the dual role of terrestrial input in OM enrichment in the SJT Formation. Our findings underscore the critical importance of an integrated model incorporating productivity, preservation, and terrestrial flux for understanding and predicting the formation of organic-rich marine shales. This model provides key constraints on the distribution of Cambrian source rocks and offers valuable insights for guiding future shale gas exploration.
10. 题目: Deep Fuzzy-NN modeling for the prediction of Zn(II) adsorption in columns using alkaline modified biochar: Integrated experimental and computational insights 文章编号: N25111716 期刊: Environmental Research 作者: B Kamala, B Latha 更新时间: 2025-11-17 摘要: The precise prediction of adsorption process is significant in the optimization of pollutant removal systems. In this research, deep fuzzy neural network (DFNN) model was developed for the prediction of Zn(II) removal efficiency using alkaline activated neem bark biochar. The study has been tested using conventional Artificial Neural Network (ANN) model which was trained using levenberg-marquandt algorithm exhibiting limited predictive performance. Modeling performance of conventional ANN trained using Levenberg-Marquandt algorithm showed limited predictive ability with R2 of 0.4670. In the view of addressing the limitations, DFNN model with integrated sugeno based inference system of 81 fuzzy rules was optimized using Gaussian membership function. Among the five tested membership functions, gauss2mf achieved the best performance with R2 of 0.9999 and mean squared error of 0.00335. DFNN model exhibited high predictive accuracy with R2 of 0.9999 with low errors. The minimal deviation among experimental and DFNN predicted values was confirmed by the residual analysis. Training convergence has been achieved within 100 epochs with reducing errors from 0.0125 to 0.0016. Hybrid optimization algorithm with DFNN model outperformed ANN model with regard to predictive accuracy and computational efficiency. The integration of fuzzy logic with neural network modeling resulted in better predictive accuracy which has been useful in predicting the adsorption dynamic patterns.
11. 题目: Synergic impact mechanisms of cover crop residue on Cd and As availability and native organic carbon mineralization in Cd and As co-contaminated paddy soil 文章编号: N25111715 期刊: Journal of Hazardous Materials 作者: Shiwen Cao, Jun Zhu, Xuelian Gan, Qingling Fu, Hongqing Hu, Qiaoyun Huang 更新时间: 2025-11-17 摘要: The synergic impacts of cover crop residue on heavy metal and metalloid availability and soil organic carbon (SOC) mineralization in contaminated paddy soil and the underlying microbial mechanism remain unclear. This study investigated the availability of cadmium (Cd) and arsenic (As) and mineralization of native SOC in paddy soil treated with 0, 0.4%, 0.8% and 1.2% of δ13C-labeled cover crop residue (Astragalus sinicus L.) via 90-day incubation experiments, the related functional genes and functional microbial communities were analyzed using metagenomic binning assembly. Cover crop residue with addition rate from 0.4%-1.2% significantly decreased available Cd by 56%-85% but increased available As by 39%-66% compared to the control treatment. Cover crop residue resulted in a positive priming effect on native SOC mineralization but benefited SOC sequestration. Cover crop residue increased the abundance of genes encoding iron reductase (mtrABC, pilA, omcB), sulfate reductase (sir, fpr), As(V) reductase (ArsC), organic carbon hydrolases, methanogenesis, and methylotrophy. Genomes associated with Chloroflexota and Bacteroidota encoded all these key pathways, and their abundance increased with cover crop residue application. Cover crop residue decreased soil Eh, dissolved crystalline iron oxides, enriched specific microorganisms, including Chloroflexota and Bacteroidota, and then synergistically promoted the decrease in Cd availability and the increase in As availability and native SOC mineralization in the examined paddy soil. These findings provided practical and feasible guidance for achieving both safe production and carbon sequestration in contaminated paddy fields, highlighting the requirement to cautious utilization of cover crop residue in As-contaminated paddy fileds.
12. 题目: Drainage volume drives dissolved organic matter leaching loss in a corn system 文章编号: N25111714 期刊: Science of the Total Environment 作者: Xinlin Wang, Diego de Sá Leitão, Alexander J Reisinger, Hardeep Singh, Lakesh Sharma, Yang Lin 更新时间: 2025-11-17 摘要: Leaching loss of dissolved organic matter (DOM) in terrestrial systems has gained increasing attention due to its critical role in carbon (C) translocation. While existing studies on DOM composition and dissolved organic carbon (DOC) leaching primarily focus on wetland and forest soils, environmental and management drivers of DOM leaching dynamics in subtropical row-crop systems remain less understood. To address this gap, we used lysimeter observations from a nitrogen (N) rate experiment in a Florida corn system over two years to assess DOM leaching loss and composition. The cumulative loss of DOC varied between 9.74 and 27.56 kg ha−1 across two growing seasons and a cover crop season. Hurricane Debby induced an extreme DOC loss of 16.92 kg ha−1 and total N (TN) loss of 298.97 kg ha−1 within days. In the 2024 growing season, groundwater likely intruded our lysimeters, introducing additional TN but diluting DOC content. In each season, DOC loss was linearly correlated with drainage volume. The strength of this relationship varied by seasons, influenced by temporal coupling of DOC supplies and drainage flux. In contrast, DOC concentration and composition did not consistently correlate with drainage volume but instead showed seasonal patterns linked to key events. For example, during the vegetative stage of corn, DOM composition shifted to more protein-like, microbially associated compounds. After soil disking and stalk return, as well as following the hurricane, DOC composition shifted toward more aromatic compounds. The DOC and TN leaching loss and DOM composition did not show a consistent difference between control and fertilized treatments. In conclusion, our results suggest that DOC leaching is mainly driven by drainage volume in this subtropical agroecosystem, while seasonal shifts in DOM composition reflected changes in DOC sources. Our findings also highlight the importance of hurricanes and groundwater intrusion in regulating DOM and TN dynamics.
13. 题目: Efficient adsorption and degradation of Di-(2-ethylhexyl) phthalate (DEHP) by Nanomaterial-modified biochar: insights into microbial communities, functional genes, and metabolic pathways 文章编号: N25111713 期刊: Water Research 作者: Weijian Zhang, Jingyi Feng, Xueyan Bai, Lu Jiang, Lei Gao, Siyu Gu 更新时间: 2025-11-17 摘要: Di (2-ethylhexyl) phthalate (DEHP) is a persistent pollutant that harms the environment and human health. Nanomaterial modified biochar (NMBs) significantly enhances the removal efficiency of organic pollutants due to its unique properties and structures. The aim of this research is to clarify the mechanisms of DEHP biodegradation in black soil over a 60 day incubation period, especially regarding the role of NMBs (nano-hydroxyapatite modified (NHBC), nano-zero valent iron modified (NZFBC)), including examining the involved metabolic pathways, the functional microorganisms facilitating the process, the functional genes responsible and the synergies between them. Results indicated that the impact of biochar on DEHP is multilayer adsorption and chemisorption. Among the treatments, NHBC exhibited the optimal degradation performance in black soil, it increased DEHP degradation efficiency from 17.79% (unamended original soil) to 91.12% after 60 days. NMBs addition notably raised the soil pH, soil organic matters (SOM), humus (HU), fulvic acid (FA), humic acid (HA) and enzyme activity. We identified three major metabolic pathways of DEHP enhanced by NHBC treatment ((phthalic acid (PA) to protocatechuic acid (PCA) to tricarboxylic acid (TCA) cycle), (Benzoic acid (BA) to cis-1,2-dihudroxycyclohexa-3,5-diene-1-carboxylate to TCA cycle) and (BA to Benzoate-CoA to TCA cycle). Additionally, 22 bacterial species and 55 functional genes involved in DEHP degradation under the action of NMBs, and identified 10 potential DEHP-degrading bacterias and 20 high-priority genes. The results provide a scientific basis for DEHP adsorption and biodegradation.
14. 题目: Remediation of soil contaminated by waste drilling slurry in oilfield with mixed bacteria immobilized by fly ash modified biochar 文章编号: N25111712 期刊: Bioresource Technology 作者: Liu Fang, Liang Jiaqi, Zhao Zhenwei, Zhao Jingang, Liu Xiao, Chen Yongdong 更新时间: 2025-11-17 摘要: Organic and heavy metal combined pollution from large-scale landfill of waste drilling slurry in oilfields poses a significant remediation challenge. This study innovatively combined fly ash doping with physicochemical modification to regulate the morphology and functionalize the surface of reed straw biochar, developing a low-cost modified biochar-based carrier material. This material, validated through leachate adsorption experiments and characterization (SEM, FT-IR, BET, XRD, TEM-EDS), exhibited both high-efficiency organic pollutant adsorption capacity and strong microbial immobilization performance. To simulate practical conditions, pot experiments were conducted, with ICP-OES and metagenomic analyses used to investigate pollutant transformation and fate. Key findings showed that unmodified biochar and fly ash formed a “glass phase-carbon matrix” structure, and under optimal conditions (biochar-fly ash mass ratio 5:1, NaOH-H2O2-assisted ultrasonic modification, 700℃ calcination), the specific surface area of modified material increased by 158.60 % compared to unmodified biochar, with an organic pollutant adsorption capacity of 32.56 mg·g−1. When immobilized with specific degrading bacteria, this material achieved 80.54 % COD removal in contaminated soil over 63 days, a rate significantly higher than that of free bacterial or biochar-based material groups, thereby demonstrating stable degradation advantages. Mechanistically, the synergistic integration of high-efficiency adsorption and biodegradation leveraging local oilfield wastes highlights this as an engineerable, efficient, and low-cost strategy for remediating waste drilling slurry-contaminated sites, with broad implications for addressing legacy composite pollution in energy industries.
15. 题目: The removal capacity, iron and phosphorus forms, and microbial distribution of low concentration phosphorus by electrolytic biochar biofilter. 文章编号: N25111711 期刊: Journal of Environmental Management 作者: Yan Gao, Yuanyuan Jin, Jiawen Mei, Peiqing Sun, Wenbiao Zhou, Jie Wang, Xinyi Wang 更新时间: 2025-11-17 摘要: An iron anode electrolytic biochar biofilter with distributed effluents was constructed to explore the roles of iron anode electrolysis and biochar substrate in phosphorus (P) removal. The results showed that iron anode electrolysis is the primary factor driving P removal. Subsequently, the released iron ions were effectively adsorbed by biochar, which is another pathway for enhanced P removal. At a voltage as low as 5 V, the average removal rate of PO43--P was 98.37 ± 1.01 %. Under power-off conditions, the average removal rate of PO43--P by iron-loaded biochar was as high as 95.92 ± 2.61 %. Biochar substrate can effectively adsorb Fe(II) or Fe(III) produced by the iron anode, with an iron loading of 4.3 ± 0.62 mg/g biochar. X-ray powder diffractometer (XRD) analysis found that the principal crystalline iron oxides loaded on biochar were FeOOH and Fe3O4. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) showed that iron-loaded biochar exhibits strong electron-exchangeability and effectively reduces charge-transfer resistance. 16S rRNA analysis showed that biochar can serve as a carrier for microorganisms, and iron electrolysis enriched the microbial community structure of the biochar substrate, as the Fe(II)/Fe(III) electron pairs generated by iron anode electrolysis enriched the electron donors or acceptors of microbes. Due to its redox functional groups and graphite-like structure, biochar can shuttle electrons. It facilitates the extracellular electron transfer of iron-reducing bacteria and indirectly promotes the Fe(II)/Fe(III) cycle, thereby influencing the iron-binding and adsorption capacity of PO43--P. The phosphorus adsorbed by iron-loaded biochar was mainly composed of NaOH-P and BD-P, indicating that biochar-loaded iron enhances phosphate fixation and improves P resource utilization during adsorption.
16. 题目: Soil organic carbon decline under bamboo invasion: The role of microbial carbon cycling. 文章编号: N25111710 期刊: Journal of Environmental Management 作者: Chushu Meng, Chaotang Lei, Xu Li, Han Sheng, Guopeng Wu, Juxiu Liu, Shu-Yi-Dan Zhou 更新时间: 2025-11-17 摘要: Moso bamboo (Phyllostachys edulis) invasion has increasingly threatened forest ecosystem stability by altering soil carbon cycling processes. However, the microbial mechanisms underlying the changes of soil organic carbon (SOC) during bamboo invasion remain poorly understood. In this study, we investigated the effects of bamboo invasion on microbial diversity, functions, and SOC content by collecting soil samples across a gradient of 0 %, 50 %, and 100 % bamboo invasion. The results showed that complete bamboo invasion significantly reduced bacterial α-diversity (P < 0.05) and promoted stochastic processes in shaping microbial communities, whereas fungal communities were more influenced by deterministic processes. Furthermore, bamboo invasion decreased the stability of bacterial interaction networks and significantly reduced SOC content (P < 0.05). To further validate this trend, we conducted a meta-analysis of 37 studies and 105 observations, which consistently indicated that bamboo invasion significantly reduced SOC. Our findings provide new insights, showing that the reduction in SOC is closely associated with a decrease in the abundance of microbial carbon cycling genes, suggesting that changes in these functional genes may be a key driver of SOC decline. These findings underscore the profound impact of bamboo invasion, which not only alters soil properties but also impedes microbial metabolism and carbon storage. The study highlights the urgent need to address plant invasions to preserve microbial ecosystem functions, which are crucial for maintaining global carbon cycles and ecosystem resilience.
17. 题目: Iron-modified calcium-based biochar for multi-metal stabilization in mine soil: Quantitative mechanistic insights, DFT analysis, and microbial community shifts 文章编号: N25111709 期刊: Journal of Environmental Management 作者: Xin Sun, Qin Yuan, Xiangfei Jiao, Youbing Wu, Liang Zhang, Lei Ye, Riquan Song 更新时间: 2025-11-17 摘要: Soils in Chinese mining areas, severely degraded and disturbed, commonly contain high, mixed heavy-metal loads, necessitating the development of highly efficient and durable remediation materials. This study developed an iron-calcium synergistic strategy to synthesize iron-modified calcium-based biochar (Fe-Ca-BC) from waste rice straw and eggshells. Iron oxides provide high specific surface area and metal-binding sites, while calcium components enhance stability through precipitation and ion exchange. In a heavily contaminated soil (Cu: 297.38 mg kg−1, Pb: 502.13 mg kg−1, Cd: 21.05 mg kg−1), a 3 % Fe-Ca-BC application reduced the available fractions of Cu, Pb, and Cd by 75.47 %, 63.93 %, and 43.56 %, respectively, after 60 days. This far outperformed single-component biochar (12.15 %–25.01 % reductions). Mechanistic apportionmen indicated heavy metal stabilization resulted from physical adsorption/ion exchange (10.80 %), co-precipitation (4.77 %), metal complexation (31.28 %), and microbial contributions (10.17 %). Density functional theory calculations confirmed adsorption energies of −0.93 eV (Cu), −1.01 eV (Pb), and −0.89 eV (Cd), indicating spontaneous and stable chemisorption. Furthermore, Fe-Ca-BC significantly improved soil pH, cation-exchange capacity, and soil organic matter, and enriched heavy-metal-tolerant microbial communities (Cupriavidus, Stenotrophomonas, Sphingobacterium), establishing a biochar-driven microbe-material synergy. Fe-Ca-BC emerges as a green, efficient soil remediation material for mining areas, providing new insights into a synergistic stabilization mechanism centered on material-microbe-metal interactions.
18. 题目: Targeted degradation pathways via Fe0 regulation for enhanced organic nitrogen removal from printing and dyeing wastewater 文章编号: N25111708 期刊: Journal of Environmental Management 作者: Shiyi Zhao, Hong Chen, Kai Wang, Gang Xue, Yaqun Jiang, Guangquan Yang, Xiaoming Zou 更新时间: 2025-11-17 摘要: Printing and dyeing wastewater (PDW) is a major source of dissolved organic nitrogen (DON), posing environmental risks such as algal blooms. This study explores the enhancement of DON removal from PDW using a Fe0-integrated hydrolysis acidification (HA)-aerobic-anoxic system. The Fe0-assisted group (G-Fe) achieved 77.4 % DON removal, outperforming the control one (G-Bio, 61.8 %). G-Fe effectively eliminated high-risk DON fractions, including low-molecular-weight, hydrophilic and bioavailable components, significantly lowering their concentrations in the final effluent compared to G-Bio. Fe0 promoted microbial-derived DON production during HA section, which was intensively removed in later phases. Based on the results of Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS), Fe0 was found to direct DON degradation pathways that are more specific and focused. The improved deamination contributed to superior DON removal; the strengthened dealkylgroup and oxygenation pathways increased hydrophilic DON generation in aerobic step, which were effectively removed via co-precipitation with iron oxides in subsequent anoxic stage. Fe0 decreased microbial diversity but enriched more functional strains like Acinetobacter, Leucobacter, and Ellin6067, capable of resisting toxicity and degrading complex pollutants. Additionally, Fe0 upregulated key metabolic pathways, including amino acid biosynthesis and TCA cycle, aiding microbial adaptation to stress. These findings underscore the potential of Fe0 to enhance DON removal and mitigate PDW-related environmental risks, offering a novel approach for advanced PDW treatment.
19. 题目: High frequency DOC proxy sensor assessment for peatland streams and across hydrological continua 文章编号: N25111707 期刊: Journal of Environmental Management 作者: Hannah Thompson, Joerg Arnscheidt, Hugo McGrogan, David P Ryan, Phil Jordan 更新时间: 2025-11-17 摘要: Fluvial dissolved organic carbon (DOC) can only be quantified through laboratory measurements which, at low frequency intervals, may lead to unreliable carbon load estimates. As a solution, studies have implemented high frequency DOC proxy sensors, which are generally fluorescence or absorbance based. These sensors, however, have rarely been tested in an upland peatland environment with very high DOC concentrations or across hydrological continua. Therefore, to test their suitability and fill this knowledge gap, fluorescence and absorbance sensors were used to take measurements along varying environmental gradients and a hydrological continuum at eleven sites. These ranged from a first-order stream in an open moor peatland, down the main channel, and up to 126 km2 during seven separate campaigns (August 2023–August 2024). Results showed that the absorbance-based sensor provided a linear relationship with DOC concentrations across the hydrological continuum and during different flow conditions. However, the fluorescence-based sensor experienced signal issues when taking measurements in the upland portion of the catchment, when DOC concentrations exceeded ∼15 mg L−1, and struggled during high flow events. Through a series of post hoc experiments, uncorrectable signal quenching was identified to be caused by a higher level of humification present in the water, measured through the E4:E6 ratio (r = 0.282, p = 0.024). Therefore, it is recommended that future peatland fluvial carbon studies implementing high frequency proxy monitoring (with higher DOC concentrations >15 mg L−1) should use absorbance based sensors rather than fluorescence based, and which offer transferability to other fluvial environments and flow conditions.
20. 题目: Paleoenvironment-driven organic matter differential accumulation: New data from the Paleogene lacustrine shale in Yitong basin, NE China 文章编号: N25111706 期刊: Applied Geochemistry 作者: Weixin Zhang, Sandong Zhou, Qiaoyun Cheng, Ruibin Chen, Hang Liu, Xinyu Liu, Hongbo Miao, Dameng Liu, Detian Yan, Hua Wang 更新时间: 2025-11-17 摘要: The Paleogene Hothouse climate significantly affects the paleoenvironment and regional climate of lake basins globally. A Hothouse climate is recorded in the Paleogene Shuangyang Formation within Yitong Basin. The first member of the Shuangyang Formation forms excellent hydrocarbon source rocks. Under the influence of a Hothouse climate state during the Paleogene, the paleoenvironmental controls on organic matter accumulation within the Shuangyang shale remain to be fully understood. This study employs an integrated analysis of mineralogy, lithology, and organic/inorganic geochemistry to divide the Shuangyang shale into three parts: lower, middle, and upper. Paleoenvironmental conditions for each part are reconstructed using diverse geochemical proxies, and the differential accumulation of organic matter is explored. The findings indicate that the Shuangyang shale is rich in quartz mineral (average = 49.35 %), with the proportion of organic-rich shale (total organic carbon, TOC ≥ 2 wt. %) accounting for 60 %. A reducing environment and suitable salinity are the basic conditions for the preservation and accumulation of organic matter. The development of organic-rich shale is driven by a humid paleoclimate, strong terrigenous detrital concentration, and high paleoproductivity. Organic matter accumulation in the lower and upper parts is driven by middle-high paleoproductivity and strong terrigenous detrital concentration, respectively. The stable development of organic-rich shale in the middle part is driven by a humid paleoclimate, moderate terrigenous detrital concentration, and medium paleoproductivity. This study reveals the driving mechanisms behind organic matter differential accumulation in various sedimentary paleoenvironments, providing valuable insights for lacustrine shale oil exploration.
