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301. 题目: Synergistic effects of warming and organic matter enrichment on coastal phosphorus dynamics at high‐nitrogen concentrations
文章编号: N26081908
期刊: Limnology and Oceanography
作者: Shuonan Ma, Ying Zeng, Haijun Wang, Jilin Xu, Cheng Luo, Chunpu Zhao, Zhanfeng Liang, Miao Liu, Erik Jeppesen
更新时间: 2026-08-19
摘要: Warming and enhanced nutrient and organic matter (OM) pollution are pervasive drivers of global environmental change that may significantly influence the dynamics of coastal sediment phosphorus (P). Traditional studies have predominantly focused on individual environmental stressors. However, the superposition of multiple stressors can trigger additive or synergistic effects, thereby inducing a cascading response of P dynamics and potentially exacerbating the risk of ecosystem collapse. To elucidate the individual and combined impacts of multiple stressors on sediment P dynamics, we performed a 2‐month mesocosm experiment with factorial combinations of three temperature gradients and two sediment types differing in OM content under high nitrogen loading conditions. We found that: (i) warming and OM, each taken individually, increased sediment P release by 39–207% and 45%, respectively, whereas their combined effect collectively amplified P release to 179–440%; (ii) the interactive impacts of these two co‐occurring stressors on sediment P release were synergistic; (iii) these factors, along with their synergistic interactions, had a cascading net facilitation effect on P release; involving increased populations of phosphate‐solubilizing bacteria, up‐regulation of functional genes ( pho D), enhanced alkaline phosphatase activity, and decreased dissolved oxygen concentration. Combined, these factors, as suggested by piecewise structural equation modeling, explain up to 97% of the observed P release. Our findings provide novel insights into the interactive impacts of co‐occurring anthropogenic stressors on coastal P dynamics, highlighting the necessity of considering the synergistic effects of warming and OM pollution on P release in future conservation planning and coastal zone management.

302. 题目: Increased vulnerability of alpine soil organic carbon is associated with glomalin decline under disturbances
文章编号: N26081907
期刊: Catena
作者: Deng Ao, Baorong Wang, Yubin Wang, Yuanjia Chen, Yasin Rena, Chao Liang, Shaoshan An
更新时间: 2026-08-19
摘要: Glomalin-related soil protein (GRSP) is widely regarded as a key microbially-derived component associated with soil organic carbon (SOC) stabilization and climate mitigation. However, given the contrasting climate constraints and disturbance sensitivities of alpine and non-alpine grasslands, the coupling between GRSP and SOC may differ between these systems. The extent to which GRSP associates with alpine and non-alpine grasslands SOC vulnerabilities to anthropogenic disturbances remains unclear. Synthesizing 587 observations, we found SOC tightly coupled with easily extractable (EE-GRSP) and total GRSP (T-GRSP), responding synchronously to grassland disturbances (degradation, grazing) and management interventions (restoration, nutrient addition). Despite maintaining substantially higher SOC (+140%), EE-GRSP (+72%), and T-GRSP (+95%), alpine grasslands were significantly more vulnerable to disturbances, experiencing greater percentage losses than their non-alpine counterparts. This heightened vulnerability tightly correlated with T-GRSP decline, suggesting coordinated responses of SOC and stable GRSP-associated pools to disturbance. Conversely, non-alpine grassland SOC associated more strongly with EE-GRSP under disturbances, reflecting a more dynamic and resilient C cycle. Under management, the positive responses of SOC and T-GRSP were substantially more pronounced in non-alpine grasslands than in their alpine counterparts. This implies that once depleted, the massive alpine carbon reservoirs exhibit persistent recovery hysteresis, revealing a stark asymmetry with the high regenerative potential of non-alpine systems. Model selection traced this divergence to different environmental controls. Alpine SOC vulnerability is strongly constrained by low temperatures and fragile nutrient limitations on GRSP production, whereas non-alpine dynamics are synergistically shaped by climate and soil nutrients. We conclude that GRSP acts as a vulnerable stabilizer of large, persistent SOC stocks in alpine grasslands, but serves as a dynamic participant in the fast C cycle of non-alpine systems. These findings suggest that GRSP-associated C dynamics should be considered when evaluating C cycle responses and designing grassland management strategies for systems with distinct vulnerability profiles.

303. 题目: Humified Dissolved Organic Matter and Heavy Metal Migration Shape Microbial Shifts at the Waste-Soil Interface of an Informal Landfill in Arid Northern China
文章编号: N26081906
期刊: Environmental Technology & Innovation
作者: Yu Liang, Zibei Zeng, Haihong Yan, Yuegang Nian
更新时间: 2026-08-19
摘要: Informal municipal solid waste (MSW) landfills constructed without engineered liners remain poorly characterized in arid regions, where limited infiltration may alter pollutant release, dissolved organic matter (DOM) transformation, and microbial assembly at the waste-soil interface. This study investigated three continuous borehole profiles from an unlined landfill in eastern Inner Mongolia, China, by integrating heavy-metal analysis, excitation-emission matrix fluorescence coupled with PARAFAC, 16S rRNA gene sequencing, microbial network analysis, and structural equation modeling. Water-extractable metals exhibited various vertical patterns within the waste body. Cu, Zn, and Hg showed higher water-extractable concentrations in deeper waste layers, whereas Ni remained weakly extractable and As exhibited a localized concentration peak. In the underlying silty clay, metal accumulation was not spatially uniform. Hg was the dominant risk element, reaching 0.157 mg/kg and an of 171.58 in the shallow interface soil beneath the deepest waste profile. DOM shifted from relatively fresh, microbial-derived fractions in the waste body to more humified and compositionally restructured fractions in interface soils, with soil humic-to-protein ratios reaching 18.47. Bacterial richness and diversity declined from waste to soil, accompanied by enrichment of Firmicutes and stress-tolerant genera. Co-occurrence and structural equation analyses indicated that humified DOM was mainly associated with reduced richness, whereas Hg-dominated metal accumulation was more strongly linked to diversity loss and community restructuring. These findings identify the waste-soil interface as a localized but critical control zone and support risk-based monitoring and targeted remediation of informal landfills in water-limited regions.

304. 题目: Dissolved organic matter reorganization is associated with hydrological niche differentiation of potential pathogenic bacteria
文章编号: N26081905
期刊: Journal of Environmental Chemical Engineering
作者: Kun Shi, Saiyu Shang, Kexuan Zhang, Jingqi Yu, Jiafeng Zhang, Muhe Diao, Shilei Zhou
更新时间: 2026-08-19
摘要: Lake-inflow rivers convey allochthonous organic matter, nutrients, and health-relevant microorganisms to receiving waters, yet links between hydrological variation in dissolved organic matter (DOM) and potential pathogenic bacteria (PPB) remain unclear. We integrated DOM optical characterization, 16S ribosomal RNA gene amplicon sequencing, niche-breadth and ribosomal RNA operon (rrn) trait analyses, and machine-learning models across major inflow rivers of Lake Baiyangdian, northern China. DOM composition differed markedly among periods. The high-flow period showed greater absorption and stronger humic-like signals, whereas tyrosine-like protein DOM contributed 49.04% during the low-flow period (LFP), consistent with period-specific inputs and local transformation. The LFP also showed stronger dominant-taxon enrichment and period specificity: Acinetobacter-related amplicon sequence variants accounted for 51.51% of PPB-related sequences, accompanied by greater contributions from narrow-niche and high-rrn-copy-number-associated groups. Community assembly was mainly stochastic, although deterministic selection contributed more during the LFP, suggesting potentially stronger environmental filtering. The PPB-related sequence abundance index (PPB-Abu) and average variation degree (AVD) were also higher, indicating concurrent increases in PPB-related sequence representation and community-state deviation. Machine-learning-assisted association-path analysis showed a consistent AVD–PPB-Abu association across periods, whereas most environmental paths remained uncertain. Overall, the LFP coincided with DOM reorganization, greater deterministic selection, period-specific PPB enrichment, and lower inferred stability. These findings characterize DOM–PPB associations and may support microbial-risk signal identification and water management in receiving wetlands.

305. 题目: Responses of toxic and non‑toxic Microcystis species to transient EPS removal: Insights into toxin‑mediated aggregation
文章编号: N26081904
期刊: Journal of Environmental Chemical Engineering
作者: Dailan Deng, Alan D Steinman, Shuyu He, Qingju Xue, Liqiang Xie
更新时间: 2026-08-19
摘要: Extracellular polymeric substances (EPS) are integral to cyanobacterial aggregation, but transient EPS removal differentially affects toxigenic versus non‑toxigenic Microcystis remains unclear. This study investigated removed EPS once from toxic Microcystis aeruginosa (M. aeruginosa) and non-toxic Microcystis wesenbergii (M. wesenbergii) using an ultrasonic centrifugation protocol and tracked physiological, aggregative, and transcriptional responses over 25 days. Results indicated EPS removal had negligible effects on M. aeruginosa growth and aggregation but triggered a 34.3% increase of microcystin in the bound EPS fraction and coordinated upregulation of microcystin synthesis (mcyD), photosynthesis (psaB), and EPS synthesis (epsL) genes. In contrast, M. wesenbergii exhibited a 5.2% increase in cell density, a 52.8% reduction in aggregation, and a decrease in specific bound-EPS components, including tyrosine-like substances and fulvic acids. Besides, EPS removal suppressed epsL expression (‑52.0%), and enhanced buoyancy gene gvpA (+92.3%) of M. wesenbergii. These findings demonstrate that temporary EPS deprivation does not curb the growth of toxic Microcystis but effectively disrupts aggregation in its non-toxic counterpart. This study suggests that microcystins may enhance the synthesis of EPS through photosynthetic stimulation to maintain colonial integrity, whereas non-toxic cyanobacteria appear to regulate buoyancy by adjusting the composition of EPS. Consequently, temporary EPS removal (e.g., mixing or turbulence) negligibly affects the growth of toxic M. aeruginosa but suppresses aggregation of non‑toxic M. wesenbergii while upregulating its buoyancy gene gvpA, indicating strain‑specific differences in the capacity to maintain colonial integrity and dispersal potential.

306. 题目: Fenton sludge-derived biochar for enhancing constructed wetland-microbial fuel cell system performance: Mechanisms and comprehensive evaluation
文章编号: N26081903
期刊: Bioresource Technology
作者: Jiawen Zhang, Tao Wang, Ping Xia, Chuqiao Wang, Caihua Liu, Peng Zhan, Xiaoming Peng
更新时间: 2026-08-19
摘要: Iron-rich Fenton sludge generated from wastewater treatment was pyrolyzed to prepare biochar, which was then applied as an electrode substrate in a constructed wetland-microbial fuel cell (CW-MFC) to simultaneously enhance wastewater treatment efficiency and recover bioenergy. By comparing the performance of three groups (pure gravel system: CW-MFC I; 400°C biochar-amended system: CW-MFC II; 600°C biochar-amended system: CW-MFC III) under varying influent concentrations, the enhancement mechanism of sludge-derived biochar was systematically investigated. Results show CW-MFC III with 600°C biochar achieved optimal performance, and the average removal efficiencies of COD, TP, NH4+-N and TN reached 91.3%, 91.4%, 81.3% and 79.5% respectively, all significantly higher than the control. It also obtained the highest output voltage (545.3 mV) and maximum power density (39.2 mW/m2). Material characterization proved 600°C pyrolysis endows biochar with developed pore structure, high graphitization and stable crystalline Fe2O3, bringing excellent adsorption, electrical conductivity and phosphorus removal potential. Microbial analysis confirmed 600°C biochar anode enriched more electroactive genera (e.g. Geobacter) and nitrogen/phosphorus removal functional bacteria. This study clarifies the “adsorption-chemical precipitation-bioelectrochemistry” synergistic mechanism, and verifies the great feasibility and application potential of this strategy for simultaneous pollutant removal and power generation.

307. 题目: Pyrolysis-dependent performance of Miscanthus-derived biochar for simultaneous removal of short- and long-chain PFAS from water
文章编号: N26081902
期刊: Separation and Purification Technology
作者: Minhee Kim, Seunghun Hyun, Junho Han
更新时间: 2026-08-19
摘要: Porous carbon-based adsorbents, including activated carbon and biochar, are widely used for controlling per- and polyfluoroalkyl substances (PFAS) in water, though their effectiveness varies by congener. Long-chain PFAS are typically well removed, while short-chain PFAS exhibit lower adsorption affinity. This study evaluates biochars derived from Miscanthus by slow pyrolysis at 400 °C (BC400) and 700 °C (BC700) for the simultaneous removal of six perfluoroalkyl carboxylic acids and six perfluoroalkyl sulfonic acids. Adsorption isotherms, kinetics, and thermodynamics were integrated with surface and pore structure characterization to elucidate congener-specific mechanisms and interactions. BC700 consistently showed higher adsorption coefficients and faster adsorption across all congeners, attributable to its higher carbonization, lower surface polarity, and more accessible pore network. In contrast, BC400 exhibited greater surface polarity and higher concentrations of leachable divalent cations, supporting stronger headgroup-mediated interactions with short-chain PFAS. Kinetic data revealed preferential early-time site occupation by long-chain PFAS, which induced competitive exclusion effects and pore-blocking that suppressed short-chain adsorption. Thermodynamic signatures (ΔG < 0; ΔH < 0) distinguished enthalpy-driven polar interactions from entropy-favored desolvation-based partitioning. These results highlight the potential of pairing biochars with complementary properties for mixed-congener PFAS treatment. A sequential treatment strategy is proposed: BC700 is used as a front-end medium for preferential long-chain PFAS removal, followed by BC400 as a polishing stage to enhance short-chain PFAS adsorption once competitive effects are reduced.

308. 题目: The dynamic nature of mineral organic matter associations in adsorption experiments
文章编号: N26081901
期刊: Chemosphere
作者: Dilshini Bandara, Michael Schindler
更新时间: 2026-08-19
摘要: Mineral-organic matter associations (MOAs) are predominant in soil environments and encompass a range of soil minerals and organic matter. This study characterizes changes in the structure and chemical composition of MOAs in the presence of metal ions of high (Cu) and low (Ni) affinity towards organic matter. It shows that MOAs are highly dynamic in terms of size, composition, and structure during their interactions with Cu- and Ni-bearing solutions. MOAs are synthesized using montmorillonite and ferrihydrite as the mineral components and polymerized fulvic acid (FA) as the organic component. Adsorption isotherms and Total Organic Carbon (TOC) analysis indicate that desorbed FA complexes both metal ions at lower metal ion concentrations and that the polymerization of Cu- and Ni-FA complexes occurs at higher metal concentrations. Structural characterization of MOAs using electron microscopy, spectroscopy, and X-ray diffraction indicates that Cu induces greater structural and compositional changes than Ni, owing to its higher affinity for polar organic functional groups. Here, the formation of Cu-carboxylate complexes in ferrihydrite-FA-OA increases with the concentrations of Cu, and the interaction of Cu with montmorillonite-FA-OA follows a 2-step intercalation with the formation of higher polymerized Cu-FA complexes at higher Cu concentrations. Additionally, the formation and polymerization of Cu-FA complexes increased the number of polar functional groups, thereby increasing the number of binding sites. Future adsorption studies involving MOAs and metal ions with a high affinity for organic functional groups need to consider that neither the surface area, composition, nor the number of binding sites in MOAs remain constant as the metal ion concentration in solution increases.

309. 题目: Tertiary Amine-Mediated Chlorination of Dissolved Organic Matter: Unraveling Molecular Reorganization and Enhanced Photochemical Reactivity
文章编号: N26081616
期刊: Water Research
作者: Linke Jiang, Shuiqin Shi, Yutong Yu, Xin Yu, Mingbao Feng
更新时间: 2026-08-16
摘要: The transformation behaviors of dissolved organic matter (DOM) were investigated during chlorination accelerated by trimethylamine (TMA, a representative tertiary amine). This study explored the transformation patterns of DOM during TMA-accelerated chlorination using Suwannee River fulvic acid (SRFA) and humic acid (SRHA) as model DOM. Spectroscopic techniques, FT-ICR MS, and machine learning were combined to reveal molecular property evolution. TMA enhanced the oxidative degradation of aromatic structures and quenched characteristic fluorophores, leading to reduced molecular weight and aromaticity. Notably, this molecular fragmentation generated photoactive moieties (e.g., aromatic ketones and quinones), resulting in elevated apparent quantum yields of triplet-state DOM and hydroxyl radicals. At the molecular level, FT-ICR MS revealed that chlorination fragmented high-molecular-weight compounds. This process was further intensified by TMA, increasing the diversity and abundance of CHO, CHON, and chlorinated species. The predominant transformation shifted from lignin/CRAM structures toward aromatic and tannin-like compounds. SHAP analysis identified molecular weight, nitrogen content, and chlorine content as key factors associated with product formation in TMA/chlorination systems. Reaction network analysis elucidated oxygenation and dealkylation as dominant pathways in TMA addition. These findings advance the mechanistic understanding of how tertiary amines mediate DOM transformation during chlorination, and provide a scientific basis for environmental risk assessment of their interactions.

310. 题目: Vis-NIR and XRF data fusion for soil organic carbon inference: Insights from large-scale spectral libraries and fitness-for-purpose evaluation
文章编号: N26081615
期刊: Soil and Tillage Research
作者: Tiago Rodrigues Tavares, Maurício Roberto Cherubin, Eudocio Rafael Otavio da Silva, Raul Roberto Poppiel, Luiza Maria Affonso Lopes da Silva, Devison Souza Peixoto, Wanderlei Bieluczyk, Budiman Minasny, José Alexandre Melo Demattê, Hudson Wallace Pereira de Carvalho, José Lavres
更新时间: 2026-08-16
摘要: Visible and near-infrared diffuse reflectance spectroscopy (vis-NIR) and X-ray fluorescence spectroscopy (XRF) are promising alternatives for rapid, reagent-free soil analysis that can help scale up soil organic carbon (SOC) monitoring for soil health and carbon credit reporting. We investigated whether combining laboratory-based vis-NIR and XRF spectra improves SOC prediction relative to vis-NIR alone, and whether the resulting performance is fit for purpose for monitoring SOC variability at farm scale. A national spectral library of 12,829 Brazilian soil samples with laboratory spectral readings was used to build global Cubist models, and eight local libraries (952 samples) were used to build local partial least squares (PLS) models. Two sensing scenarios were compared: vis-NIR alone and vis-NIR + XRF data fusion. Performance was evaluated using conventional accuracy metrics and a fitness-for-purpose framework based on analytical tolerances and percentile error profiles. The results support the added value of XRF as complementary information to vis-NIR for SOC prediction under both modelling strategies, with the largest relative improvement observed under the global-Cubist strategy (RMSE of 1.11 g kg–1 for vis-NIR+XRF, versus 1.52 g kg–1 for vis-NIR alone) and the best absolute performance achieved under the local-PLS strategy (RMSE of 0.97 g kg–1 with vis-NIR+XRF, versus 1.15 g kg–1 with vis-NIR alone). Using an application-specific analytical tolerance framework, sensor-based monitoring was fit-for-purpose mainly under medium and high within-farm SOC variability, but not under low variability. These results support sensor-based SOC inference as a practical tool for farm-scale monitoring.

311. 题目: Soil aggregate protection mechanism explains differential preservation of terrigenous organic carbon in marine environments
文章编号: N26081614
期刊: Organic Geochemistry
作者: Xiaofang Yu, Xianyu Huang, Yi Yang, Xiaoxia Lü
更新时间: 2026-08-16
摘要: Although microbial processing has been identified as a key mechanism for terrigenous organic carbon loss in marine systems, the underlying reasons for its extensive consumption remain poorly understood. To address this knowledge gap, we conducted experiments under controlled salinity conditions, tracking the behavior of plant-derived n-alkanes and microbial-derived glycerol dialkyl glycerol tetraethers (GDGTs) during the transition from terrestrial to marine environments. Our results demonstrate distinct preservation patterns between these biomarker classes. While the distributions of n-alkanes and GDGTs showed no significant changes, the concentration of n-alkanes in terrigenous sediments remained essentially unchanged after 12 months in seawater incubation, whereas GDGT concentrations decreased substantially upon marine exposure. Soil aggregate analysis revealed that small macroaggregates (2–0.25 mm) broke down into microaggregates (0.25–0.053 mm) under saline conditions. The substantial total organic carbon loss observed during this process suggests that aggregate destruction serves as the primary driver of carbon mineralization. These findings support a conceptual model in which both plant and microbially derived terrigenous carbon are initially preserved within soil aggregates and undergo differential degradation during fluvial transport. When these aggregates enter marine systems, cations disrupt their structural integrity, releasing protected microbial-derived organic carbon that is rapidly consumed by marine microorganisms. This mechanism is corroborated by the proliferation of Proteobacteria and Bacteroidetes, which are known as major degraders of terrestrial organic matter and respond directly to the released microbial-derived organic carbon liberated from disrupted soil aggregates. Our study provides new mechanistic insights into the fate of terrigenous organic carbon in marine environments, highlighting the critical role of soil aggregates stability in regulating carbon persistence across the land-ocean interface.

312. 题目: Molecular-level source contribution of dissolved organic matter in a typical plateau lake using end-member mixing analysis based on spectroscopic, stable isotope and molecular fingerprint
文章编号: N26081613
期刊: Journal of Hydrology
作者: Yunxuan Cheng, Shasha Liu, Rui Fu, Yi Ren, Yuxuan Zhang, Ziwen Yin, Fengchang Wu
更新时间: 2026-08-16
摘要: Lakes receive and actively process dissolved organic matter (DOM) from diverse sources, thereby influencing water quality and the global carbon cycle. Accurately identifying DOM sources and apportioning their relative contributions are critical for effective lake management and understanding carbon cycling in lacustrine ecosystems. However, precise source attribution remains challenging because DOM originates from heterogeneous sources and undergoes continuous biogeochemical transformations. Here, we quantified DOM source contributions in Erhai Lake, a typical plateau lake, using end-member mixing analysis based on stable isotope, spectroscopic, and molecular fingerprint data. The results indicated that wet season DOM exhibited stronger optical signatures of humification and aromaticity, greater molecular unsaturation, a higher oxidation state, and enrichment in nitrogen- and sulfur-containing formulas, whereas dry season DOM was more reduced and enriched in CHO formulas. Analysis of the potential DOM end-members showed that anthropogenic inputs, including manure and wastewater treatment plant effluent, were less humified and less unsaturated than natural watershed sources such as forest soil and riverine inputs, but more oxygenated than most internal lake sources, such as algae and bottom sediments. Comparison of lake and end-member DOM identified common relatively recalcitrant formulas, from which retained molecular markers were selected according to source specificity. Random forest analysis was then used to select indicative parameters of these markers for incorporation into the end-member mixing models. Based on convergence diagnostics and posterior credible intervals, the model incorporating stable isotope, optical, and molecular data was identified as optimal and was subsequently used to quantify DOM sources in Erhai Lake. The model results showed that anthropogenic inputs made the largest contribution in both seasons, accounting for 44.61% in the dry season and 42.63% in the wet season. Natural watershed sources contributed 29.24% and 26.54% of the DOM pool during the dry and wet seasons, respectively, whereas internal lake sources accounted for 26.15% and 30.83%, respectively. Manure was the largest individual source in the dry season (34.03%), whereas agricultural runoff was the largest individual source in the wet season (15.93%). This framework provides a molecularly constrained approach for DOM source apportionment and highlights hydrological control over seasonal source structure in Erhai Lake.

313. 题目: Particulate organic matter governs the vulnerability of soil mercury in Himalayan valleys
文章编号: N26081612
期刊: Journal of Hazardous Materials
作者: Huhu Kang, Miaoxin Ji, Junming Guo, Xiaohong Liu, Lingyu Gao, Jie Huang, Shichang Kang, Xingle Qu, Zhiwei Liu, Xiufeng Yin, Qianggong Zhang
更新时间: 2026-08-16
摘要: Understanding mercury (Hg) sequestration in soils requires moving beyond bulk soil measurements to resolve the functionally distinct organic matter pools that govern Hg stability. Here we quantify Hg partitioning across particulate (POM) and mineral-associated (MAOM) organic matter in five Himalayan valleys, critical transboundary corridors for atmospheric Hg transport. MAOM contained markedly elevated Hg concentrations (1.0-268.1 ng g⁻¹, mean ± SD = 49.2 ± 51.3 ng g⁻¹), with values 1.8- to 2.9-fold higher than those of particulate organic matter (POM). When subdivided, coarse POM (cPOM) spanned 2.3-244.7 ng g⁻¹ (56.4 ± 47.8 ng g⁻¹), while fine POM (fPOM) ranged from 5.0 to 409.9 ng g⁻¹ (89.8 ± 54.3 ng g⁻¹). Combined POM fractions accounted for 67.9% of the total soil Hg pool, highlighting a fundamental duality: MAOM functions as a stable, Hg-concentrated sink, whereas POM represents the dominant yet potentially labile Hg reservoir. Drivers shift systematically: coarse POM is controlled by eight key significant factors (carbon, nitrogen, microbes, metal oxides), whereas MAOM is governed primarily by two core factors among the measured variables, microbial biomass and soil moisture. This shift delineates two distinct sequestration pathways, litterfall-driven incorporation in POM versus microbially mediated stabilization in MAOM, with largely different implications for Hg stability under environmental change. Soil fractionation thus provides a transferable framework for integrating functionally distinct Hg pools into global models and assessing risks in mountain ecosystems.

314. 题目: Scaling up biochar based remediation: Continuous column adsorption of toxic elements from oil sands wastewater and sequential valorization of spent biochar in cement
文章编号: N26081611
期刊: Journal of Hazardous Materials
作者: Abhijeet Pathy, Scott X Chang, M Anne Naeth
更新时间: 2026-08-16
摘要: This study examined simultaneous removal of potentially toxic elements from spiked oil sands process affected water, using canola straw biochar in fixed bed columns. Elements were arsenic (As), cadmium (Cd), cobalt (Co), chromium (Cr), copper (Cu), nickel (Ni), selenium (Se), and zinc (Zn). Adsorption hierarchy (Cd>Co>Ni>Zn) was consistent with alkalinity governing selectivity. Under optimal conditions (2 mL min⁻¹, 12 cm bed depth, 240 h), maximum equilibrium adsorption capacities 0.279, 0.210, 0.126, 0.104 mg g⁻¹ were for Cd, Co, Ni, Zn, respectively. As, Cr, and Se uptake was negligible, consistent with electrostatic repulsion; Cu adsorption was limited by complexation with dissolved organic matter. A 17.2–29.4 min empty bed contact time maximized Cd and Co service time. Thomas and Yoon-Nelson models captured breakthrough behaviour for Cd, Co, and Ni, not oxyanions. A techno-economic analysis showed per litre treatment costs declined 84% (CAD 17.80–2.65). Cement valorization avoided CAD 0.375 kg⁻¹ of spent biochar, yielding 168.75 savings over 150 runs across 3 columns at industrial scale. Incorporating spent biochar into cement at 1–2% (w/w) suppressed leaching of most potentially toxic elements; Cr leaching increased in cement treatments, consistent with release from cement, supporting a circular end-of-life pathway for spent biochar.

315. 题目: Regulatory role of natural organic matter in magnetic capture of functionalised polystyrene nanoplastics: Heteroaggregation, attachment performance and life cycle sustainability
文章编号: N26081610
期刊: Journal of Hazardous Materials
作者: Hanghang Zhao, Xunli Wang, Jinyu Tao, Wenquan Cui, Zeping Liu, Huiping Dai, Zhifeng Liu, Yaoyao Zhang, Fengming Song, Zuoping Zhao, Xing Xu
更新时间: 2026-08-16
摘要: Natural organic matter (NOM) influences the interactions between nanoplastics and magnetic particles; however, the mechanisms governing NOM-mediated attachment of functionalised nanoplastics during magnetic capture remain unclear. This study evaluated the capture of pristine polystyrene (PS) and carboxylated PS (PS-COOH) nanoplastics on magnetically modified lignite (MML) in NOM-containing waters. Mechanistic analyses revealed that nanoplastic attachment was controlled by collision efficiency and interfacial interactions rather than by NOM adsorption alone. Capture was enhanced by heteroaggregation promotion at low NOM concentrations and inhibited by surface-site masking and electrosteric stabilisation at high NOM concentrations. Nanoplastic attachment followed pseudo-first-order kinetics and Langmuir-type saturation behaviour, with PS-COOH exhibiting stronger attachment affinity than pristine PS. Attachment efficiency measurements, Derjaguin–Landau–Verwy–Overbeek analysis and X-ray photoelectron spectroscopy confirmed that nanoplastic capture exhibited a concentration-dependent transition, shifting from enhanced to suppressed as NOM concentration increased. Artificial neural network–SHapley additive explanation analysis identified nanoplastic concentration as the dominant factor, followed by NOM concentration. During continuous-flow experiments using real wastewater, MML achieved over 90% nanoplastic removal. Life cycle assessment identified acid consumption and electricity demand as key environmental hotspots. This study provides mechanistic insights into NOM-regulated magnetic nanoplastic capture and supports sustainable remediation strategies in complex aquatic environments.

316. 题目: Humic acid acting as a photosensitizer enhances periodate activation under visible light irradiation for efficient microcontaminant abatement
文章编号: N26081609
期刊: Journal of Hazardous Materials
作者: Bin Zhang, Qiuling Lu, Wenjun Zhang, Jiayi Ma, Haonan Lu, Kai Wang, Jun Ma, Junhui Zhou, Tao Yang, Tiangang Luan
更新时间: 2026-08-16
摘要: Photoactivated periodate (PI)-based advanced oxidation processes (AOPs) are effective for removing refractory micropollutants, but PI can hardly be activated by visible light alone. This study employed ubiquitous aquatic humic acid (HA) to boost visible light-driven PI activation. 2 mgC/L HA increased naproxen (NAP) removal in the Vis460/PI system from 10% to 75.8% at pH 7.0. The kobs of NAP rose from 0.064 min−1 to 0.185 min−1 with the PI concentration increasing from 25 μM to 100 μM. Quenching and probe experiments verified hydroxyl radicals (HO•) and ozone (O3) as the dominant species, with their contributions at 77.6%–93.2% and 13.9%–20.6% across pH 4.0–9.0, respectively. The excited triplet state (3HA*) was the key photoproduced reactive intermediate for PI activation. Longer visible wavelengths inhibited NAP degradation due to lower photon energy, while acidic conditions facilitated the reaction via higher PI quantum yield. Higher HA concentration generated more 3HA* to accelerate PI activation, and aromatic ketones were more likely precursors of the triplet excited state. The system efficiently degraded seven micropollutants, and Suwannee River NOM shared a similar activation role. This work offers a reliable approach for improving the visible light-activated PI system and novel insights into HA photochemical behaviors.

317. 题目: Preparation of biochar from litter biomass and microorganism-loaded biochar for Cd2+ removal from aqueous solutions
文章编号: N26081608
期刊: Journal of Environmental Management
作者: Girdhari Harijan, Sumbal Sajid, Farhan Nabi, Meghwar Madan Lal, Iqra Arshad, Xing Yang, Xianfa Li
更新时间: 2026-08-16
摘要: This study explores the potential of biochar derived from freely available litter biomass and microorganism-loaded biochar as an effective method for removing Cd2+ from aqueous solutions. Five different types of litter biomasses (Platanus acerifolia, Cortaderia selloana, Bambusa multiplex, Eucalyptus globulus, Camphora officinarum) were used to prepare biochar through pyrolysis at a fixed pyrolysis temperature of 600 °C and residence time of 3 h. Among these, Eucalyptus globulus biochar (EG-biochar) exhibited the highest adsorption capacity for Cd2+, with a removal efficiency of 83.57% and the highest yield of 32.76%. The pyrolysis conditions were subsequently optimized and the optimal operational parameters were determined as pH 7, biochar dose 1.5 g/L, adsorption temperature 25 °C, contact time 180 min, and ionic strength of 0 M NaNO3. The adsorption behavior was evaluated using Langmuir and Freundlich isotherm models and pseudo-first-order and pseudo-second-order kinetic models. The fitting results indicated that Cd2+ removal involves multiple interactions, including surface complexation, ion exchange, and binding to heterogeneous adsorption sites, rather than a single adsorption mechanism. Additionally, the biochar was enhanced by immobilizing B. subtilis, which improved the adsorption capacity to 124 mg/g and the removal efficiency to 95%. The EG-biochar and B. subtilis-loaded biochar were characterized by Fourier transform infrared (FTIR) spectroscopy, Scanning electron microscopy (SEM), X-ray diffraction (XRD), Thermogravimetric Analysis (TGA) and Brunauer-Emmett-Teller (BET). The results suggest that EG-biochar and microorganism-loaded biochar are viable, sustainable, and environmentally friendly solutions for Cd2+ removal from aqueous solution. This study demonstrates the potential of EG-biochar and B. subtilis-loaded biochar as promising and effective adsorbents for the removal of Cd2+ from aqueous solutions, though further research using real or simulated wastewaters is necessary to validate their performance under more complex conditions.

318. 题目: Utilization of spent biochar as a novel adsorbent and catalyst for the removal of ciprofloxacin from water: Insights into the performance and mechanisms
文章编号: N26081607
期刊: Journal of Environmental Chemical Engineering
作者: Xiaohong Hu, Tao Jiang, Bing Wang, Rui Li
更新时间: 2026-08-16
摘要: Spent biochar generated from wastewater treatment may cause secondary disposal pressure, whereas the retained metal/sulfur species may provide an opportunity for catalytic resource utilization. In this study, calcium alginate-biochar composite after acid mine drainage (AMD) treatment was used as a Fe/S-containing precursor and pyrolyzed to prepare a dual-functional biochar adsorbent/catalyst for ciprofloxacin (CIP) removal. The material obtained at 750°C, P-CABC-750, exhibited a developed pore structure and contained Fe/S species, mainly FeS and Na3FeS3. The well-developed pore structure favored adsorption, while the Fe/S species contributed to peroxymonosulfate (PMS) activation. The maximum adsorption capacity of P-CABC-750 for CIP was 8.57mg/g, and the P-CABC-750/PMS system degraded 91.22% of CIP within 100min. CIP adsorption was mainly associated with electrostatic interactions, hydrogen bonding, possible Fe-related surface complexation, and partial pore filling. Electron paramagnetic resonance analysis confirmed the formation of both •OH and SO4•− in the P-CABC-750/PMS system, while quenching experiments suggested that •OH made a more significant contribution to CIP degradation under the tested conditions. After five cycles, P-CABC-750 still maintained more than 50% adsorption-based CIP removal and more than 80% CIP degradation in the P-CABC-750/PMS system. This work provides a feasible waste-to-resource strategy for converting AMD-treated spent biochar into a functional material for antibiotic-contaminated water treatment.

319. 题目: Simultaneous adsorption of polystyrene nanoplastics and phosphorus by a magnetic calcium-modified biochar from aqueous solutions: Mechanism and applications
文章编号: N26081606
期刊: Journal of Environmental Chemical Engineering
作者: Jingran Fu, Zelong Wang, Sishi Liu, Maoyu Jiao, Shefeng Li, Siyu Ding, Yong Zhang, Xuli Li, Haijun Lu, Jing Zhang, Hongyu Wang
更新时间: 2026-08-16
摘要: Polystyrene nanoplastics (PS-NPs) and phosphorus (P) are widely distributed in various aquatic environments, posing significant risks to aquatic ecosystems and human health. Herein, peanut shell was employed as precursor to fabricate a novel magnetic calcium-modified biochar (MCBC) at 700 ℃ for 3h to remove PS-NPs and P from aqueous solutions. In single contaminated system, P and PS-NPs adsorption capacities by MCBC were 79.62mg/g and 47.14mg/g, approximately 3.3 and 2.1 times higher than those of unmodified peanut shell biochar without calcium loading and magnetic modification, respectively. In binary contaminated system, P and PS-NPs adsorption capacities by MCBC were 68.12mg/g and 37.06mg/g, respectively, demonstrating excellent simultaneous adsorption properties. Characterization analyzed by SEM, FTIR, XPS and XRD manifested that the excellent simultaneous adsorption mechanism of MCBC for P and PS-NPs was mainly depend on the chemical precipitation between P and calcium loaded on the MCBC surface and the surface complexation between PS-NPs and iron loaded on the MCBC surface, respectively. Dynamic adsorption experiment indicated that MCBC was an ideal filler for bioretention to removal P and PS-NPs in the initial rainwater. Besides, pot experiment results showed that MCBC after adsorbing P was very helpful for mung beans’ germination and growth in PS-NPs-contaminated soils by slowly releasing phosphorus and adsorbing PS-NPs. This study provides theoretical support and a feasible material scheme for the treatment of phosphorus-microplastic combined polluted water, and also offers reference for the application of biochar-based fillers in stormwater treatment facilities such as rain gardens.

320. 题目: Pyrolysis temperature controls long-term stability of heavy metals in sludge-derived biochar after soil application and oxidative aging
文章编号: N26081605
期刊: Journal of Cleaner Production
作者: Taichi Anai, Kanta Kojima, Kazunori Iwabuchi, Fumihiko Takebe, Takanori Itoh
更新时间: 2026-08-16
摘要: We evaluated how pyrolysis temperature and post-application aging jointly control heavy-metal speciation and ecological risk in sewage sludge-derived biochars. Metal-enriched sludge was pyrolyzed at 300, 500, 700, and 900 °C, mixed with soil, and aerobically incubated for 300 days; metal partitioning was quantified using a modified BCR (European Community Bureau of Reference) sequential extraction. To evaluate the resistance of metal stabilization to accelerated oxidative aging, pristine materials were pretreated with hydrogen peroxide (H2O2; 1% or 5%, w/v) before 30-day soil incubation. A temperature-dependent transition in metal stabilization occurred between 500 and 700 °C, with metal partitioning shifting from oxidizable fractions (F4) to mineral-dominated residual fractions (F5) at ≥700 °C. During pyrolysis, Hg was almost completely volatilized at 300 °C, and Cd decreased markedly at ≥700 °C, indicating volatility-driven reduction in solid-phase risk. In contrast, Pb, Cr, Cu, Zn, Ni, and As were largely retained and exhibited element-specific redistribution during soil incubation. Pb, Cr, Cu, and Zn showed progressive enrichment in F5, whereas Ni stabilization was mainly established during pyrolysis. Arsenic remained comparatively sensitive to oxidative alteration, displaying measurable redistribution during aging. The fraction-based modified ecological risk index values were lowest for ≥700 °C biochars and remained low after aging, indicating that high-temperature pyrolysis enhances long-term stability but requires emission control for volatilized metals.