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601. 题目: Almond-shell-derived Fe-La biochar enables magnetic capture and pyrolysis-assisted conversion of nanoplastics
文章编号: N26071919
期刊: Bioresource Technology
作者: Jin Ge, Zhaoshuang Li, Xu Xu, He Liu, Guoen Yang, Chuntao Kuang, Min Zhang, Zhenfei Yang, Yuanfeng Wei, Yiqiang Wu
更新时间: 2026-07-19
摘要: Nanoplastics (NPs) are emerging aquatic contaminants with high mobility, colloidal stability, and potential biological accessibility. However, many existing treatment methods mainly transfer captured NPs into a secondary solid phase, leaving NP-bearing residues that still require further handling. To address this issue, Fe-La-modified magnetic almond-shell biochar was prepared as a regenerable adsorbent that integrates nanoplastics capture, magnetic recovery, and pyrolysis-assisted regeneration. Among the prepared materials, Fe/La@MBC-1:1 exhibited the best overall adsorption performance toward polystyrene nanoplastics (PSNPs), with a Langmuir maximum capacity of 555 mg/g. Stable removal behavior was maintained under varying water chemistry conditions and in real-water matrices. Additional tests further showed effective removal at lower PSNPs concentrations and across different particle sizes, surface functionalities, and selected nanoplastic types. The adsorption behavior was associated with enhanced interfacial interactions between Fe/La@MBC-1:1 and nanoplastics, including electrostatic attraction and van der Waals forces. After five adsorption-pyrolysis regeneration cycles, the removal efficiency remained at 85% in batch adsorption and above 70% after the fifth regeneration cycle in flow-through column operation. These results indicate that Fe/La@MBC-1:1 provides a feasible biochar-based route for integrated nanoplastics capture, magnetic recovery, and pyrolysis-assisted regeneration.

602. 题目: Sulfur-modified biochar for synergistic Cr(VI) immobilization and soil moisture retention: interfacial complexation and long-term stability under dynamic aging
文章编号: N26071918
期刊: Separation and Purification Technology
作者: Sitong Li, Dong Huang, Junfeng Tang, Lipin Ren, Guiji Guo, Yonglong Wu, Aoyang Jiang, Yile Li, Zihan Su, Ruifeng Li, Jinghao Rao, Meiqin Zhou
更新时间: 2026-07-19
摘要: To address the separation challenges of highly mobile hexavalent chromium [Cr(VI)] in complex environments and mitigate soil water scarcity, a dual-functional sulfur-modified biochar (S-BC) was engineered from bamboo residues. Spectroscopic characterizations (XPS and FTIR) indicated the incorporation of surface-accessible sulfur moieties, including oxidized Sdouble bondO groups and a minor lower-valence sulfur fraction assignable to Csingle bondS/S0/polysulfide-like species. DFT calculations further indicated that Csingle bondSsingle bond and Sdouble bondOsingle bondbearing sites strengthened HCrO₄− adsorption and promoted interfacial charge redistribution toward Cr(VI), supporting a stepwise adsorption–electron transfer–Cr(III) fixation pathway. The separation behavior aligned with the pseudo-second-order kinetic and Langmuir isotherm models, indicating a chemisorption-dominated purification process governed by robust surface complexation and the concomitant reduction of Cr(VI) to Cr(III). While providing a reliable baseline adsorption capacity (54.18 mg/g at 55 °C) in aqueous batch systems, S-BC exhibited exceptional structural stability and separation efficiency within complex continuous-flow matrices. Specifically, dynamic column assays demonstrated a 43.9% reduction in cumulative Cr(VI) leaching, with the S-BC sustaining a separation and immobilization efficiency exceeding 99% across rigorous wet-dry aging cycles. Furthermore, spatial configuration evaluations revealed that homogeneous mixing effectively mitigated preferential flow pathways, thereby optimizing mass transfer and outperforming layered application strategies. In addition to robust contaminant sequestration, the S-BC amendment significantly improved water retention (achieving a peak capacity of 44.50%), thereby validating its engineered dual-functionality. Collectively, these findings highlight S-BC as a highly viable, waste-derived material for the sustainable separation of Cr(VI) and the enhancement of drought resilience in fluctuating environments.

603. 题目: Soil texture affects methane emissions in paddy fields through alterations in organic carbon partitioning and root exudation
文章编号: N26071917
期刊: Journal of Cleaner Production
作者: Deshun Xiao, Yulu Yang, Chang Ye, Hengyu Ma, Chunmei Xu, Song Chen, Guang Chu, Yuanhui Liu, Kai Yu, Danying Wang
更新时间: 2026-07-19
摘要: Paddy rice systems are a major agricultural source of methane (CH4) emissions. Although soil texture is a fundamental soil property, its role in regulating CH4 emissions remains underexplored. A two-year field experiment was conducted using a split-split-plot design, with soil texture as the main plot, straw return method as the subplot, and nitrogen application as the sub-subplot, to elucidate the effects and mechanisms of soil texture on CH4 emissions. The results showed that paddy fields with different soil textures exhibited distinct CH4 emission patterns and responded differently to straw incorporation and nitrogen fertilization. When straw was incorporated, nitrogen fertilization significantly reduced CH4 emissions in silty clay loam (15.9% clay) and sandy loam (7.0% clay) by 19.20% and 43.14%, respectively, but increased emissions in silty loam (2.6% clay) by 36.84%. Therefore, this study proposed that straw return and nitrogen application strategies should be optimized based on soil texture, which would facilitate further CH4 mitigation. Soil texture was found to primarily regulate CH4 emissions by influencing organic carbon allocation and plant growth. Silty clay loam promoted the partitioning of organic carbon into mineral-associated organic carbon, whereas sandy loam favored the accumulation of particulate organic carbon. Dissolved organic carbon exhibited the strongest correlation with CH4 emissions. Root exudates were identified as a key factor in the soil-plant-microbe interaction network governing CH4 emissions in paddy fields and had the highest importance score in Random Forest models. Moreover, key differential root metabolites not only demonstrated strong predictive performance for CH4 emissions but also exhibited robust linear relationships with CH4 fluxes, and were also significantly correlated with the composition of CH4-related functional microbial communities. This work provided new insights into the mechanisms underlying CH4 emissions in paddy fields and provided both a theoretical foundation and practical management strategies for precision mitigation. These advances contributed to promoting cleaner rice production and achieving sustainable agricultural goals.

604. 题目: Direct addition and legacy effects of sulphur fertilisation on microbial soil organic matter mineralisation and priming effect
文章编号: N26071916
期刊: Soil Biology and Biochemistry
作者: Yahaya Jebril Amanor, Eric Paterson, Nabla Kennedy, Aoife M Duff, Patrick Forrestal, David P Wall, Fiona Brennan
更新时间: 2026-07-19
摘要: A promising strategy to optimise nitrogen (N) management in agriculture involves accounting for microbial soil organic matter (SOM) mineralisation and incorporating the associated N-flux into fertiliser management. While SOM mineralisation is known to be influenced by C:N stoichiometry, the role of other nutrients, particularly sulphur (S) in regulating the process remains poorly understood. This study investigated SOM priming under four S fertilisation scenarios: no S; direct S, S legacy, and S legacy + direct S. Glucose-13C was added to soils with all S fertilisation scenarios, and 13CO2 and CO2 measured over a 16-day incubation period. Microbial biomass (C, N, S, P) and enzyme activities were measured, while molecular sequencing and RNA:DNA ratios assessed microbial metabolic potential and life strategies linked to priming. Glucose addition stimulated positive priming via increased enzyme activity and was associated with higher microbial biomass N and P, but not C, indicating stoichiometric regulation. This was accompanied by increased metabolic potential of both r and K-strategist SOM decomposers: Nakamurella, Microlunatus, and Cellvibrio. S legacy increased positive priming by 86% relative to NoS, whereas direct S addition to this soil reduced priming by 31%, along with reductions in enzyme activities. Legacy, but not direct S drove differences in microbial community, indicating the S-legacy-induced change in priming was associated with prevalence of a distinct microbial community with enhanced SOM turnover capacity. Upon direct S addition, this community shifted to use of the added S, reducing reliance on SOM mineralisation. The increased metabolic potential of both r-strategist (Ohtaekwangia) and K-strategist (Kribella and Cellvibrio) SOM decomposers under S legacy indicate diverse microbial life strategies were associated with priming under S fertilisation. Our findings indicate tailored S management can influence microbial processes regulating SOM mineralisation, with implications for timing and availability of N, P, and S to support more sustainable agricultural production.

605. 题目: Flooding patterns and litter traits drive the early-stage divergence of particulate and mineral-associated organic carbon in coastal wetlands
文章编号: N26071915
期刊: Estuarine, Coastal and Shelf Science
作者: Eesha Wasim, Xinhan Dong, Jiantong Liu, Hongcheng Li, Zhongzheng Yan
更新时间: 2026-07-19
摘要: Coastal wetlands are globally significant blue carbon sinks, yet the mechanisms driving the early-stage divergence of particulate (POC) and mineral-associated organic carbon (MAOC) under altered hydrology and contrasting plant litter inputs remain poorly understood. A 60-day microcosm experiment examined how two flooding patterns — low-frequency/short-duration (high marsh, HM) and high-frequency/long-duration (low marsh, LM) — interact with labile Spartina alterniflora (low C/N ratio) and recalcitrant Phragmites australis (high lignin/N ratio) litters to drive the early-stage transformation of soil organic carbon (SOC) into dissolved organic carbon (DOC), microbial biomass carbon (MBC), POC, and MAOC. By integrating physical SOC fractionation, 16S rRNA gene sequencing with FAPROTAX functional prediction, and partial least squares structural equation modeling (PLS-SEM) path analysis, we identified a stability trade-off: the LM pattern facilitates POC preservation under persistent anoxia, while the HM pattern promotes microbially driven MAOC formation in the later stages of decomposition, driven by fluctuating redox conditions. Litter chemistry further partitions carbon fate: labile S. alterniflora enhances microbial-necromass-derived MAOC formation via the microbial carbon pump, whereas recalcitrant P. australis preferentially accumulates as POC specifically under HM, where oxygen availability allows litter recalcitrance to exert its effect; under LM, sustained anoxia suppresses this litter-quality control. Litter addition also restructured bacterial community structure, with copiotrophic bacteria dominating early stages and oligotrophic bacteria increasing in relative abundance over time. These findings establish a mechanistic framework for predicting coastal wetland blue carbon resilience under sea-level rise, shifting tidal regimes, and vegetation shifts.

606. 题目: Visible-light-driven CuVO/biochar composite activates periodate for efficient diclofenac degradation: Unveiling the electron-shuttling mechanism of p-benzoquinone
文章编号: N26071914
期刊: Journal of Environmental Chemical Engineering
作者: Yuxin liu, Wen Tan, Sinuo Gong, Yang Guo, Jingyi Zhu, Honghui Pan, Qin Shi, Shiyong Huang, Ziyin Li, Chuanqi Zhao
更新时间: 2026-07-19
摘要: Persistent emerging contaminants have attracted growing attention owing to their environmental persistence and potential risks to ecosystems and human health. Herein, a visible-light-driven CuVO/BC photocatalytic system with synergistic electron transfer was constructed by introducing periodate (PI, strong oxidant) and p-benzoquinone (p-BQ, electron mediator). The p-BQ-modified PI/CuVO/BC system exhibited a 248-fold reaction rate enhancement relative to the control, achieving complete diclofenac (DCF) degradation within 10 min. As an electron acceptor and shuttle, p-BQ captured photogenerated electrons to form p-BQ•-, which efficiently suppressed e--h+ recombination, accelerated electron transfer to PI, and enabled cyclic electron transport for continuous reactive species production. Quenching experiments and electron paramagnetic resonance identified 1O2 as the dominant reactive species, alongside •OH, •O2-, IO3•, and h+. Electrochemical tests verified that p-BQ reduced charge-transfer resistance and boosted photocurrent response, confirming its key role in electron regulation. The system showed high activity over a wide pH range, with low sensitivity to common anions (only CO32- exerted strong inhibition) and excellent structural stability (validated by SEM, XRD, XPS, FTIR) and recyclability. The transformation intermediates were identified by LC-MS, and the possible degradation pathways were proposed, including hydroxylation, decarboxylation, dechlorination, C-N bond cleavage, and aromatic ring-opening reactions. Toxicity assessment indicated that the overall toxicity of the intermediates gradually decreased. The system retained a high activity across various water matrices and under natural sunlight, which highlighted its strong environmental adaptability and practical potential. These findings have provided new insights for the removal of pharmaceutical pollutants and the design of multi-component, synergistic electron-regulation photocatalytic systems.

607. 题目: Micro-interfacial dynamic response mechanisms of arsenic adsorption by river biofilms: Roles of EPS components and functional groups
文章编号: N26071913
期刊: Journal of Environmental Chemical Engineering
作者: Yafu Zhang, Qiuying An, Haibo Zhou, Changzhou Yan
更新时间: 2026-07-19
摘要: River biofilms produce more complex extracellular polymeric substances (EPS) than single algae or bacteria. Due to their high adsorption capacity, widespread distribution, and in situ remediation potential, they are considered a promising technology for arsenic (As)-contaminated water remediation. However, the micro-interfacial dynamic response mechanisms underlying As(III)/As(V) interaction with river biofilm EPS remain poorly understood. Compared with EPS-depleted biofilms, intact biofilms showed stronger As adsorption, and potentiometric titration revealed that the total apparent concentration of titratable sites in intact biofilms reached 829.6 μmol g⁻¹ , approximately 2.17 times that in EPS-depleted biofilms. ITC confirmed spontaneous As–EPS binding, with As(V) exhibiting higher affinity than As(III), as indicated by a higher binding constant (9.56 × 10 ³ vs. 2.05 × 10 ³ M⁻¹) and a more negative ΔG value (−22.72 vs. −18.90 kJ mol⁻¹). Fluorescence analysis showed that tryptophan- and tyrosine-like components participated in As binding; at 200 μM As(III)/As(V), their fluorescence intensities decreased by 46.0%/27.0% and 50.3%/30.9%, respectively. Complementary spectroscopic and surface chemical analyses identified hydroxyl, carboxyl, ether, amide, amino, and carbonyl groups as key reactive sites. Polysaccharide-associated groups responded earlier than protein-associated groups. As(V) showed relatively stable selectivity for oxygen-containing polysaccharide sites, whereas As(III) exhibited broader but concentration-dependent interactions with both polysaccharide and protein domains. These findings provide molecular-level insights into the spatially heterogeneous and concentration-dependent mechanisms of As adsorption by river biofilm EPS.

608. 题目: Lignocellulose precursor regulated radical/non-radical pathways of diclofenac degradation in Fe/biochar activated percarbonate systems
文章编号: N26071912
期刊: Bioresource Technology
作者: Yudong Huo, Xinyu Zhou, Xuxuan Lu, Ying Zhang, Chun Pei, Lijie Xu, Lu Gan
更新时间: 2026-07-19
摘要: Percarbonate (SPC) an environmentally friendly peroxide has attracted increasing attention. Herein, two iron-carbon composites with distinct structures were synthesized regulated by the carbon precursors of cellulose and lignin, and the performance of SPC activation was compared using diclofenac (DCF) as the probe. The cellulose-derived Fe3C@Cel showed core-shell appearance and graphitic structure, demonstrating stronger ability of adsorption, retaining iron and electron transfer than the lignin-derived Fe0@Ln. The removal efficiency of DCF by both catalysts was comparable to that in corresponding processes activating peroxymonosulfate and H2O2. The complete degradation of 0.05 mM DCF could be achieved within 10 min. Compared with Fe0@Ln, Fe3C@Cel exhibited more significant advantages in adapting wide pH range and complex water compositions, reducing reagent dosage, and improving sustainability. The DCF removal rate in Fe3C@Cel/SPC could still maintain 84.0% after 5 cycles. The non-radical electron transfer mechanism contributed more significantly to DCF degradation in Fe3C@Cel/SPC, while •OH, O2•- and CO3•- were the dominant contributors in Fe0@Ln/SPC. The lattice oxygen and CO groups contributed to the ROS generation in Fe3C@Cel/SPC process, while the lattice oxygen and homogeneous activation by Fe2+ were the main routes of ROS generation in Fe0@Ln/SPC process. The identification of primary degradation intermediates revealed that fewer intermediates were identified in Fe3C@Cel/SPC, and the toxicity evaluation of the intermediates showed general decrease trends of bioconcentration factor, mutagenicity, developmental toxicity and biological toxicity. The intermediates identified in Fe3C@Cel/SPC showed lower developmental and biological toxicity. The results may provide insights in developing practical and environmentally friendly advanced water treatment technologies.

609. 题目: Biochar modulates microbial carbon metabolism to mitigate global warming potential during composting
文章编号: N26071911
期刊: Environmental Pollution
作者: Wenqi Liang, Xu Ma, Yujuan Wang, Wenming Zhang, Chenxu Yu
更新时间: 2026-07-19
摘要: Carbon loss via CO2 and CH4 emissions reduces the organic carbon available for humification, which may negatively affect compost quality while exacerbating environmental pollution. Herein, this study investigated the impacts of biochar (e.g., rice husk biochar (RHB) and sawdust biochar (SDB) as composting additives on CO2 and CH4 emissions, as well as the underlying microbial mechanisms. The results demonstrated that, comparing to the control (CK), RHB and SDB reduced cumulative CO2 emissions by 11.38% and 16.30%, respectively (both P < 0.05), whereas they increased CH4 emissions by 45.35% (P < 0.05) and 81.04% (P < 0.01), respectively. Overall, the 100-year global warming potentials (GWP-100s) of the RHB and SDB treated groups were decreased by 15.91 g CO2e·kg-1 and 19.29 g CO2e·kg-1, respectively. Redundancy analysis (RDA) and partial least squares path modeling (PLS-PM) revealed the total organic carbon (TOC) to be the key environmental regulatory factor. Specifically, TOC was significantly negatively correlated with CO2-producing genes and aerobic methane oxidation genes, yet it exhibited a positive correlation with methanogenic genes which underlines the up-regulation of CH4 emissions from the biochar-treated composting systems. The addition of biochar increased the TOC of the compost systems, which induced microbial community shift from r-strategy to K-strategy, inhibited CO2 production, yet modulated methanogenesis. This cascade of effects reduces the net GWP of compost via microbial-mediated mechanisms. The findings of this study provided a critical theoretical foundation and a practical guideline for optimizing the biochar-manure co-composting process to reduce overall greenhouse gas emission from composting.

610. 题目: Synergistic effects of sugarcane biochar and glycine betaine foliar spray on lettuce (Lactuca sativa L.) physiological performance, biochemical markers, metabolites, and antioxidative features under wastewater irrigated soil
文章编号: N26071910
期刊: Environmental Technology & Innovation
作者: Hafiza Iqra Almas, Fasih Ullah Haider, Lili Nian, Muhammad Sajid, Aaliya Batool, Fahd Rasul, Usman Zulfiqar, Mashael Daghash Alqahtani, Mayank Anand Gururani
更新时间: 2026-07-19
摘要: Wastewater irrigation can alleviate freshwater shortages, but its continued use may impair soil quality and crop performance by accumulating salts and heavy metals (HMs). Biochar (BC) can reduce HM bioavailability in soil, whereas glycine betaine (GB) can enhance plant tolerance by improving osmotic adjustment and antioxidant defence. However, their combined role in mitigating HM stress induced by wastewater in lettuce (Lactuca sativa L.) remains insufficiently understood. Therefore, a pot experiment was conducted using two irrigation sources, canal water (CW) and Madhuana drain wastewater (MDWW), together with four amendment treatments: control, BC (3% w/w), foliar-applied GB (50 mM), and BC + GB. Morphological, physiological, biochemical, and antioxidant attributes were evaluated and analysed using analysis of variance at P < 0.05. Compared with CW, MDWW irrigation significantly reduced shoot length (11.0%), root length (63.5%), fresh weight (84.9%), dry weight (27.3%), and leaf number, while also decreasing photosynthetic pigments, gas-exchange traits, and membrane stability. Wastewater stress further increased oxidative damage and HM accumulation in lettuce tissues. Among all treatments, the combined application of BC + GB provided the strongest protection by improving growth, photosynthetic efficiency, metabolite accumulation, and antioxidant enzyme activity, while reducing oxidative stress indicators. Importantly, BC + GB also lowered cadmium, chromium, and lead accumulation by 68%, 46%, and 49%, respectively, compared with the untreated wastewater control. Overall, the integrated BC and GB application mitigated wastewater-induced stress in lettuce by improving physiological resilience, enhancing biochemical defense, and reducing HM uptake under contaminated irrigation, thereby promoting safer and more sustainable lettuce production.

611. 题目: Decoupled storm-phase source dynamics of dissolved and particulate organic matter in an agricultural watershed
文章编号: N26071909
期刊: Journal of Hydrology
作者: Yun Kyung Lee, Ho-Yeon Park, Haeseong Oh, Seung-Hee Kim, Kyung-Hoon Shin, Jae-In Kim, Byung Joon Lee, Jin Hur
更新时间: 2026-07-19
摘要: Storm events strongly regulate organic matter (OM) mobilization in agricultural watersheds, yet potential differences in the source evolution of dissolved and particulate OM (DOM and POM) across storm phases remain poorly constrained. Here, we conducted hydrograph phase-resolved storm sampling during two rainfall events and applied end-member mixing analysis (EMMA) to quantify phase-specific OM source dynamics. Source contributions were traced using δ13C–δ15N for POM and fluorescence indices for DOM. Bulk water-quality parameters and POM concentrations increased with discharge during the monitored events, closely tracking suspended solids and particulate nutrients, suggesting cumulative mobilization under event-specific hydrological conditions rather than a clear first-flush-like decline. EMMA results indicated highly dynamic POM source evolution, with leaf litter/riparian vegetation initially contributing 60–67% of POM during the early stage but declining to ∼29% near peak flow as soil-derived POM increased sharply to ∼51%, consistent with discharge-associated particulate mobilization and progressive source-area activation during storm progression. In contrast, DOM showed comparatively buffered dynamics and a strong manure/compost-like signature within the FI–BIX-based EMMA framework, contributing ∼37–58% across storm phases, suggesting persistent leaching and flushing from manure-amended areas once source areas became connected to active flow paths. Source-specific OC fluxes were concentrated in short high-flow windows, with sharp POC pulses near peak discharge and more persistent DOC export into recession. These findings indicate decoupled POM and DOM transport during the monitored storms and highlight the value of phase-resolved, OM-specific source apportionment for interpreting storm-driven carbon export and informing targeted watershed management.

612. 题目: Pre-monsoon flow-path switching regulates downstream dissolved organic carbon dynamics in a high-alpine river on the Qinghai–Tibet Plateau
文章编号: N26071908
期刊: Journal of Hydrology
作者: Dong Zhang, Yindong Tong, Xiaodong Li, Yanli Sun, Jiajun Han
更新时间: 2026-07-19
摘要: High-altitude semi-arid rivers undergo rapid hydrological reorganization during the pre-monsoon season, yet the respective roles of antecedent warming, initial thaw, and changes in hydrological connectivity in regulating the downstream export of dissolved organic carbon remain poorly understood. To clarify these controls, we conducted high-frequency monitoring at 3-day intervals in the Lhasa River Basin on the Qinghai-Tibet Plateau from March to early July 2024. Dissolved organic carbon (DOC), dissolved inorganic carbon (DIC), major ions, and stable isotopes (δ13C-DOC, δ13C-DIC, δD, and δ18O) were measured to trace water sources and carbon dynamics. Our results reveal a pronounced pre-monsoon hydrochemical turning point, driven primarily by seasonal flow-path switching rather than by direct glacier meltwater inputs. During the early pre-monsoon period (March–mid-May), river discharge was dominated by groundwater, and DIC and major ions increased gradually while DOC remained relatively low. Distinct hydrochemical and isotopic shifts occurred around mid-May, coinciding more closely with sharp increases in air temperature. After mid-May, the river transitioned to a more mixed hydrological regime, as indicated by marked shifts in water isotopes (δ18O: −17.0‰ to −14.5‰; d-excess: 9.3‰ to 13.5‰), declining DIC and major ion concentrations, increasing DOC concentrations (0.7–2.0 mg C·L−1), and progressively more depleted δ13C-DOC (−25.8‰ to −28.5‰) and δ13C-DIC values (−4.5‰ to −6.9‰). These coupled patterns suggest that antecedent warming and initial thaw preconditioned near-surface hydrological connectivity and reorganized flow paths, thereby increasing the DOC mobilization from shallow organic-rich source areas while diluting groundwater-derived DIC and major ions with low-solute near-surface waters, including thaw and snowmelt contributions. Comparisons with glacier-fed streams further indicate that glacier meltwater contributes only marginally to downstream DOC in the Lhasa River. Overall, our findings show that pre-monsoon carbon dynamics in this high-alpine river are controlled primarily by thermally driven hydrological switching superimposed on early-season thaw, highlighting the sensitivity of alpine carbon export to short-lived connectivity pulses on the Qinghai-Tibet Plateau.

613. 题目: Slope position regulates soil organic carbon sequestration across particulate and mineral-associated fractions in karst soils
文章编号: N26071907
期刊: Environmental Technology & Innovation
作者: Xiaoxiao Zou, Qin Tang, Yujia Li, Qiang Li
更新时间: 2026-07-19
摘要: The sources and stability of particulate organic matter (POM) and mineral-associated organic matter (MAOM) fundamentally regulate soil carbon dynamics, but their characteristics in karst ecosystems remain poorly understood. This study focused on the typical peakless basin system in Guangxi, and soil samples were collected across slope positions. Using physical fractionation, 13C nuclear magnetic resonance spectroscopy, and biomarker analysis, our study characterized the sources and stability of POM and MAOM. Our results showed that with slope position, the contents of dissolved organic carbon, exchangeable magnesium, and exchangeable sodium in both POM and MAOM decreased significantly, whereas exchangeable calcium and iron increased. The alkyl C/O-alkyl C ratio in POM generally decreased along downslope, whereas the ratio in MAOM significantly increased at depression. Biomarker analyses indicated that microbial necromass carbon (MNC), primarily of fungal origin, was the dominant source of soil organic carbon (SOC) in POM and MAOM, while total lignin phenols (TLP) was significantly higher in POM than that in MAOM. Random forest analysis and structural equation modeling revealed divergent accumulation pathways. Specifically, exchangeable iron was identified as the primary predictor for POM, with TLP directly driving SOC sequestration. Conversely, microbial richness indirectly promoted SOC sequestration by enhancing MNC formation, which served as the primary mediator. By differentiating soil carbon fractions, this study reveals the distinct mechanisms of organic matter accumulation in POM and MAOM across karst slope positions. Consequently, these findings advance the mechanistic understanding of the spatial heterogeneity of soil carbon sinks and their underlying biogeochemical drivers in karst ecosystems.

614. 题目: Boosting bioenergy recovery from corn stover and food waste via Fe/Ni-modified biochar in anaerobic co-digestion: Synergistic electron transfer and metabolic regulation
文章编号: N26071906
期刊: Journal of Environmental Chemical Engineering
作者: Minhao Wu, Minglei Tang, Yipeng Zhang, Li Chen, Jiyong Bian, Dapeng Li, Longyi Lv
更新时间: 2026-07-19
摘要: Anaerobic co-digestion (AcoD) of corn stover (CS) and food waste (FW) represents a promising synergistic technical pathway for energy recovery from biomass waste streams. However, the practical deployment of this AcoD technology faces challenges such as low lignocellulose hydrolysis efficiency, excessive accumulation of volatile fatty acids (VFA), and imbalanced microbial community structure. Herein, a novel mild-reduction strategy was innovatively employed to fabricate Fe/Ni-bimetallic modified biochar (Fe/Ni-BC) to overcome these issues. Comprehensive characterization confirmed that Fe/Ni-BC featured abundant surface-active sites, excellent electrical conductivity, and superior electrochemical stability. Batch fermentation tests revealed that Fe/Ni-BC amendment enhanced cumulative methane production by 126% compared with the control group, with total solid (TS) and volatile solid (VS) removal efficiencies reaching 44.36% and 67.78%, respectively. Meanwhile, Fe/Ni-BC effectively buffered pH, alleviated VFA accumulation, and accelerated acidogenic substrate degradation. Microbial analysis demonstrated that Fe/Ni-BC significantly enriched functional hydrolytic and fermentative bacteria (e.g., Clostridium, Bacteroides) and both hydrogenotrophic and acetotrophic methanogens, which suggests favorable conditions for direct interspecies electron transfer and optimizes methanogenic pathways based on microbial community variations. Metabolic profiling further indicated that Fe/Ni-BC upregulated the core carbohydrate metabolism module and boosted the activities of key lignocellulolytic enzymes, including β-glucosidase, cellulase, and α-glucosidase. This study provides a novel feasible strategy for efficient AcoD intensification, clarifies the synergistic mechanism of Fe/Ni bimetallic biochar for enhancing anaerobic digestion, and offers valuable guidance for sustainable biomass waste-to-energy conversion.

615. 题目: Pore regulation of chitosan biochar and its efficient adsorption of dyes in high-salty wastewater: Revealing the effect of NaOH distribution on pore shape
文章编号: N26071905
期刊: Journal of Environmental Chemical Engineering
作者: Tailin Guo, Shan Gao, Tengfei Ren, Jianxin Liu, Jiancheng Wang
更新时间: 2026-07-19
摘要: Porous biochar represents an important adsorbent for the adsorption removal of dyes, largely owing to its mesopores structure. Nevertheless, the treatment of dye-containing pollutants, particularly those in high-salty wastewater, still poses a persistent challenge in the environmental field. Herein, we report a facile strategy to fabricate hierarchical micro-mesoporous structure dominated by mesopores, by regulating the distribution of NaOH within chitosan beads (CB). It was found that when NaOH is distributed both inside and outside the CB, a novel hierarchical pore architecture with a proposed “funnel-like” morphological feature can be formed in the resulting biochar (denoted CBWn-T-t). When evaluated as an adsorbent, CBW2-800–2 showed adsorption capacities of 789.89 mg/g, 571.76 mg/g, and 376.08 mg/g for MB, NR, and MO, respectively. It can be attributed to the stacking of dye molecules within the proposed “funnel-like” pores during adsorption. Notably, CBW2-800–2 delivered an adsorption capacity as high as 939.97 mg/g in high-salinity MB solutions and reached adsorption equilibrium within 15 min, indicating both enhanced adsorption capacity and accelerated kinetics. The adsorption process was mainly governed by pore filling, π-π interactions, and hydrogen bonding. To the best of our knowledge, this work is the first to systematically elucidate how NaOH distribution during material preparation affects the porous topology of biochar. The adsorbent with the proposed novel “funnel-like” pore structure exhibited superior adsorption capacity for organic dyes, especially in high-salinity wastewater.

616. 题目: Effects of cellulase treatment on properties and functional performances of hardwood-like lignocellulose-based biochar and its modified derivatives
文章编号: N26071904
期刊: Bioresource Technology
作者: Kai Yang, Kang Wang, Wenyan Xie, Wenjuan Wang, Wen Tao Li, Jing Cao, Jing Wang, Han Tang, Min-tian Gao, Jiajun Hu, Jixiang Li
更新时间: 2026-07-19
摘要: Treating lignocellulosic agricultural wastes with cellulase generates monosaccharides for biofuel production and saccharification residues that can be converted into biochar with better performance than those from untreated materials. However, while cellulase pretreatment is highly effective for gramineous straws, its efficacy on hardwood-like lignocellulosic materials remains unknown. This study explored the applicability of cellulase pretreatment to tobacco stalks (hardwood-like) for biochar preparation. Results showed cellulase pretreatment enhanced biochar stability and subsequent optimization via thermal air oxidation and colloid modification further improved its performance, confirming it as a high-quality precursor biochar. Cellulase pretreatment primarily increased raw material crystallinity, which in turn improved biochar crystallinity and structural stability. Compared with untreated biochar (BC-O), colloid-modified biochar (BC-SAC) exhibited a rise in specific surface area from 4.9 to 344.1 m2/g, alongside rapid phenol adsorption reaching equilibrium within 12 h and enhanced removal performance toward various phenolic contaminants. Environmental and economic evaluations indicated that BC-SAC achieved a carbon emission reduction of 0.68 t CO2 per year per ton of feedstock. Additionally, its iodine value, a key pricing index for carbon-based adsorbents, rose from 503 mg/g to 881 mg/g. This study broadens the feedstock scope of cellulase pretreatment for biochar production and is of great significance for efficient multi-product utilization of lignocellulosic biomass resources.

617. 题目: Membrane and electric field co-assisted promotes the reduction of greenhouse gas emission coupled with humification of thermophilic composting
文章编号: N26071903
期刊: Environmental Research
作者: Dandan Liu, Kaipeng Zhai, Li Chen, Yuchen Liu, Jie Ye, Dayong Chen, Zhen Yu, Jian Lü, Hao Lin, Zhi Chen
更新时间: 2026-07-19
摘要: Electrical field-assisted thermophilic composting (eTC) is considered a promising technology for enhancing compost maturation, while membrane-covered composting is an effective strategy for reducing harmful gas emissions. However, the combined application of membrane and electric field to simultaneously enhance organic matter humification and mitigate greenhouse gas emissions during composting has rarely been explored. In this study, we constructed membrane and electric field co-assisted thermophilic composting (m-eTC) and confirmed its effect on promoting organic matter humification and greenhouse gas emissions reduction, respectively. The results showed that humic acid content in m-eTC was 1.22- and 1.15-fold higher than that in ordinary thermophilic composting (oTC) and eTC, respectively. Moreover, the global warming potential, expressed as CO2-equivalent emissions, was reduced by 11.9% and 9.8% compared with oTC and eTC. Microbial analyses revealed selective enrichment of humification-related bacteria (e.g., Nocardiopsis and Saccharomonospora) and regulation of key functional genes related to greenhouse gas emissions (e.g., pmoA and norB) in the m-eTC system. Interactive Mantel test and partial least-squares path modeling further demonstrated that m-eTC significantly enhanced the positive effects of composting properties and small-molecule organic acids on organic matter humification. In contrast, m-eTC attenuated the positive effects of composting properties and bacterial activity on greenhouse gas emissions. This study indicated that m-eTC is an effective strategy for simultaneously reducing greenhouse gas emissions and promoting organic matter humification, offering a promising pathway for efficient and sustainable organic solid waste management.

618. 题目: Organic Matter Removal in Microplastic Extraction from Environmental Samples: Challenges and Methodological Solutions
文章编号: N26071902
期刊: Journal of Hazardous Materials
作者: Hrithik Nath, Shiva Zolfaghari, Melissa A Maurer-Jones, Gopala Krishna Darbha, Maryam Salehi
更新时间: 2026-07-19
摘要: Accurate quantification and characterization of microplastics (MPs) in complex environmental samples is essential. Achieving this requires reliable protocols for extracting and isolating MPs from other matrix components that may interfere with analytical detection or hinder recovery. To address this need, this paper focuses on the removal of biogenic organic matter (OM), a major constituent of terrestrially derived environmental samples and water samples. We discussed how the interferences caused by OM, such as biofilms, algae, plankton, plant debris, and microbial residues, can reduce separation efficiency, clog filtration systems, overlap with MP signals in microscopy and spectroscopy, or introduce background noise in thermal analyses, ultimately leading to misidentification or false positives. To address these issues, a preparatory step involving the efficient removal of OM while minimizing alterations to the physicochemical properties of MP particles is essential. In this paper, we present a detailed discussion of various OM digestion methodologies and factors such as temperature and duration impacting their efficiencies. Moreover, the potential impacts of these methodologies on the MPs’ physicochemical properties, such as surface chemistry and size distribution, are discussed. The most common methods involve oxidative, acidic, alkaline, and enzymatic digestions showed varied levels of OM removal efficiency. Integrating these approaches has shown to enhance OM digestion while minimizing damage to MPs, thereby offering optimized performances for diverse environmental samples while preserving polymer stability.

619. 题目: Organic matter enrichment and warming synergistically drive sediment phosphorus release in macrophyte-dominated lakes: Geochemical and microbial mechanisms
文章编号: N26071901
期刊: Journal of Cleaner Production
作者: Fajian Li, Yaobin Lv, Chunmin Zhang, Xue Zhang, Hongbin Yin, Ming Kong
更新时间: 2026-07-19
摘要: Sediment phosphorus (P) release generally intensifies with warming; yet the synergistic effects of temperature and organic matter (OM) enrichment on P dynamics remain poorly understood. In this study, we conducted long-term microcosm incubations under ambient and elevated temperatures using sediments with equivalent total P but varying OM contents. The results showed that elevated OM expanded the sedimentary mobile P (Mobile-P) pool; high-OM sediments (M-10%) contained 1.5 times more Mobile-P than low-OM sediments (M-2%). Warming and high-OM loading synergistically increased the sediment oxygen uptake rate and compressed the interfacial oxidation layer (<2 mm). Consequently, the average soluble reactive phosphorus (SRP) release flux in the M-10% treatment on day 15 was 47 times that of the M-2% treatment. This intense P release was driven by the reductive dissolution of iron-bound P (BD-P), the enzymatic hydrolysis of organic P (Org-P), and the chemical dissolution of calcium-bound P (HCl-P). Microbial analysis further revealed that high OM enrichment upregulated genes involved in Org-P hydrolysis (phoD) and iron reduction (mtrC). However, warming reshaped the dissolved organic matter (DOM) pool in the M-10% treatment, where accumulated insoluble humic acids immobilized SRP via chemical complexation with metal cations, thereby reducing the SRP flux by day 50. Nevertheless, this flux remained 21 times that of the M-2% treatment. This study elucidates the key geochemical and microbial mechanisms by which macrophyte-derived OM enrichment promotes sediment P release under warming, providing critical insights for sediment management and eutrophication control in macrophyte-dominated ecosystems.

620. 题目: Regional-scale prediction and assessment of soil organic matter content in the Yuanmou Dry-Hot Valley, Southwest China, using satellite-derived phenological time series and deep learning.
文章编号: N26071719
期刊: Environmental Monitoring and Assessment
作者: Dengdeng Ding, Jida Yang, Sihe Deng, Hongye Zhu, Zhengbo Ma, Chengxiu Fu, Junlang Deng, Dingyun Zhao, Zhen Long, Xiaoyan Wang, Peiwen Yang, Qibin Chen, Qing Zhang
更新时间: 2026-07-17
摘要: The dry-hot valley region is characterized by pronounced topographic relief and a complex land-use mosaic, resulting in strong nonlinearity and fine-scale spatial heterogeneity in soil organic matter (SOM). These characteristics increase the difficulty and uncertainty of remote sensing-based digital soil mapping. Although Yuanmou County has been widely investigated, limited attention has been paid to regional-scale SOM prediction in dry-hot valley ecosystems using long-term satellite-derived phenological dynamics and deep learning approaches. To address this gap, this study integrated 475 topsoil samples, topographic factors, environmental covariates, and multi-year satellite-derived phenology time-series variables to develop a regional-scale SOM prediction and assessment framework in Yuanmou County, Yunnan Province, China. The predictive performance of four models was compared, including a convolutional neural network (CNN), a CNN-random forest hybrid model (CNN-RF), a CNN-long short-term memory model (CNN-LSTM), and an attention-augmented CNN-LSTM model (CNN-LSTM-Att). The results showed that model architecture had a substantial influence on SOM prediction accuracy, with overall performance ranked as CNN-LSTM-Att > CNN-LSTM > CNN-RF > CNN. Among the four models, CNN-LSTM-Att achieved the best performance on the independent test set, with R2 = 0.61, RMSE = 2.49 g kg⁻1, and MAE = 1.39 g kg⁻1. The incorporation of temporal modeling and the attention mechanism improved the extraction of dynamic phenological signals associated with SOM formation, resulting in a more refined spatial representation. The CNN-LSTM-Att prediction map clearly identified low-SOM areas along the northern valley corridor and high-SOM zones in the forest-dominated southern and eastern regions, while showing stronger sensitivity to local patches and transitional ecotones. Overall, coupling long-term phenological dynamics with an attention mechanism improved both the predictive accuracy and spatial expressiveness of SOM mapping in complex terrain, providing a useful methodological reference for SOM assessment and precision land management in dry-hot valley regions.