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181. 题目: n ‐Alkane Gradients Reshape Soil Microbial Networks and Functions at Petroleum Refinery Sites
文章编号: N26071201
期刊: Environmental Microbiology
作者: Youru Zhang, Shixuan Cui, Yu Zhang, Jizhuang Chu, Kaiyue Liu, Xinjie Shan, Na Wang, Shudi Yao, Qiang Kong, Cheng Dong, Huanxin Zhang
更新时间: 2026-07-12
摘要: Petroleum refining activities exert substantial contamination pressure on soil ecosystems, yet the corresponding microbial response mechanisms remain insufficiently understood. This study integrates source apportionment, high‐throughput sequencing and co‐occurrence network analysis to elucidate microbial adaptations along a petroleum exposure gradient. Source analysis confirmed that all soils were predominantly influenced by petroleum‐derived inputs, with hydrocarbon concentrations increasing significantly across gradients. Under contamination levels of 422.35–621.21 mg/kg, petroleum pollution not only reduced soil total organic carbon (TOC) but also induced coupled C–N interactions and altered soil physicochemical properties, resulting in complex environmental effects. The soil quality index (SQI) exhibited a nonlinear trend, first decreasing and then increasing, with moderate overall levels (0.40–0.45). Functional diversity analyses indicated functional convergence rather than loss under contamination stress. At the metabolic level, low exposure primarily stimulated naphthalene degradation and detoxification pathways, whereas high exposure shifted microbial functions towards oxidative stress resistance and membrane structural remodelling. Meanwhile, microbial networks transitioned from densely connected but disturbance‐sensitive structures at low exposure to simplified yet more stable and robust configurations at high exposure. These findings provide mechanistic insights into microbial adaptation in petroleum‐contaminated soils and offer theoretical support for bioremediation strategies.

182. 题目: Adsorption behavior and co-pollutant interactions between representative polycyclic aromatic compounds and heavy metals mediated by soil organic matter and Fe oxides in soil aggregates
文章编号: N26071117
期刊: Journal of Soils and Sediments
作者: Ye He, Jiawen Zhong, Xiaoli Wei, Jinjin Wang, Huijuan Xu, Yulong Zhang, Wenyan Li
更新时间: 2026-07-11
摘要: Purpose Polycyclic aromatic compounds (PACs) and heavy metals (HMs) frequently coexist in the soil of industrial areas, posing significant ecological risks. This study investigated the distribution and influencing factors of PACs and HMs in soil aggregates under co-contamination, as well as their interactive adsorption behavior and mechanisms with soil, with a focus on lead (Pb), phenanthrene (Phe), and 1-acenaphthenone (1-ACE). Methods Soil samples were collected from an industrial area and fractionated into four aggregate sizes. soil properties and the contents of PACs and HMs in different aggregates were determined. Single and co-adsorption behaviors of Pb, Phe, and 1-ACE were examined through batch adsorption experiments, with isotherms modeled using Freundlich, Langmuir, and Linear models. Adsorption mechanisms were further explored by X-ray photoelectron spectroscopy (XPS) analysis. Results Most PACs and HMs mainly accumulated in the < 0.002 mm aggregates, with HMs influenced by multiple soil properties and PACs primarily influenced by soil organic matter (SOM). The Freundlich parameters (KF and 1/n) indicated that Pb exhibited heterogeneous multilayer adsorption, while Phe and 1-ACE exhibited homogeneous adsorption. The presence of Phe inhibited Pb adsorption by 7.94–19.28%, whereas 1-ACE enhanced it by 3.28–12.65%. Conversely, Pb coexistence increased the adsorption of Phe (17.29–27.26%) and 1-ACE (40.10–60.03%). XPS revealed that Phe competed with Pb for C=O groups, weakening Pb’s complexation and ion exchange, while 1-ACE promoted Pb adsorption by increasing C=O proportions. Pb enhanced Phe adsorption via increased surface hydrophobicity and π-π interactions, while it promoted 1-ACE adsorption through strengthened complexation and iron oxides interactions. Conclusions The results demonstrated that the interaction between co-contaminants and soil can alter the adsorption behaviors of pollutants, thereby deepening our understanding of their environmental fates. These findings provide crucial insights for assessing environmental risks and developing remediation strategies for co-contaminated soils.

183. 题目: Shifts in organic carbon fractions, chemical functional groups, and mineralization enhance soil carbon storage after restoring earthen aquaculture ponds to wetlands
文章编号: N26071116
期刊: Catena
作者: Ping Yang, Kaiyuan Liu, Junwei Wang, Hong Yang, Dengzhou Gao, Guanpeng Chen, Wenjing Liu, Chuan Tong, Dongyao Sun, Yanxun Xu, Kam W Tang
更新时间: 2026-07-11
摘要: Coastal wetlands, as key “blue carbon” ecosystems, have suffered extensive global loss and degradation driven primarily by land-use change for agriculture and aquaculture, and initiatives to restore earthen aquaculture ponds to wetlands has helped recover lost wetlands and restore their ecosystem functions. This study examined the effects of this restoration effort on soil organic carbon (SOC) chemical composition, mineralization, stability and storage in a coastal wetland in southeast China. Our results showed that, relative to the earthen aquaculture ponds, restored wetlands had more total carbon by 35.8%, SOC by 46.4% and easily oxidized carbon by 106.2%, but less microbial biomass carbon and dissolved organic carbon by 26.1% and 32.7%, respectively. Following restoration, total carbon and organic carbon stocks in the top 30 cm of soil increased by 6.9 Mg C ha−1 (+14.5%) and 9.3 Mg C ha−1 (+24.7%), respectively. In restored wetlands, enzyme activities of β-1,4-glucosidase and cellulobiohydrolase decreased significantly; SOC mineralization rate decreased by 22.1%–40.0% across all seasons, and bioavailable carbon estimated from first-order kinetic model sediments was 44.3% less than earthen aquaculture ponds. Spectral analyses showed that restoration led to an increased proportion of stable carbon groups, for example, O-alkyl C and aromatic C, along with a significantly higher O-alkyl C/aromatic-C ratio. Structural equation modeling analysis indicated that restoration affected SOC dynamics primarily by elevating ionic stress and reducing microbial substrate availability. Overall, this study demonstrated that converting earthen aquaculture ponds into coastal wetlands with native vegetation can effectively increase blue carbon sequestration, enhance the long-term stability of stored carbon, and strengthen the associated climate mitigation benefits.

184. 题目: Organic carbon allocation and stability in mangrove surficial sediment
文章编号: N26071115
期刊: Limnology and Oceanography
作者: Kai Yu, Kai Xiao, Xiaoyi Hu, Xi Wang, Shuai Gao, Haodong Ji
更新时间: 2026-07-11
摘要: Mangroves are coastal vegetated ecosystems with a remarkable carbon sequestration capacity that is vital for mitigating global climate change. The sediment organic carbon (SOC) in mangroves originates from both autochthonous plants and allochthonous inputs. However, the primary factor governing the allocation and stability of SOC in mangroves remains under debate. Here, characterization of carbon content and multiple stable isotopes in a marine mangrove revealed that SOC was enriched in surface layers in the tidally driven groundwater recharge zone, and its content decreased progressively with depth. The composition of SOC sources remained consistent within the upper 30 cm but varied considerably across tidal zones. Contributions of three potential sources were quantified using bulk carbon and nitrogen isotope analysis combined with a Bayesian isotope mixing model. The results showed that the contribution of mangrove species diminished from 71.7% ± 9.3% in the recharge zone to 4.0% ± 5.5% at the tidal flat, whereas that of marine microalgae increased from 25.8% ± 11.0% to 89.8% ± 14.3%. Spartina alterniflora was identified as a minor contributor. Compound‐specific carbon isotope analysis of individual amino acids (AAs) showed that mangrove‐derived essential AAs (EAAs) dominate the sedimentary EAA pool. Water extraction experiments, together with the characterization of seawater and porewater, showed that SOC in the recharge zone likely released soluble fractions that underwent mineralization in porewater and exchanged dissolved inorganic carbon with surface waters driven by tidal pumping. Overall, our findings suggest that tidally induced zonation is the overarching factor governing both the allocation and stability of SOC in mangrove ecosystems.

185. 题目: Migration and transformation of organic carbon and nutrients in rice straw during hydrothermal cracking
文章编号: N26071114
期刊: Waste Management
作者: Xiaoxiao Yang, Jue Wang, Kaile Li, Rui Xia, Kewen An, Qinghai Li, Hui Zhou, Yanguo Zhang
更新时间: 2026-07-11
摘要: The sustainable utilization of straw supports the United Nations’ Sustainable Development Goals. The effects of varying reaction temperatures and duration on the hydrothermal cracking process of rice straw were evaluated, focusing on the transfer of organic carbon and nutrients from rice straw. The results indicated that the hydrothermal cracking of rice straw was a thermochemical transformation primarily driven by dehydration reactions, with temperature serving as the key factor affecting the properties of the resulting products. Over 50 % of the organic carbon was retained in the solid-phase. A moderate reaction temperature of 180 °C promoted the preservation of easily oxidized organic carbon within the solid phase, accounting for approximately 98 %, with the retention of numerous hydroxyl groups. Elevated temperature accelerated the dehydration of rice straw and enhanced the aromaticity and hydrophobicity of the solid products. Three-dimensional fluorescence analysis indicated that higher temperatures facilitated the formation of humus-like substances in the liquid phase. Over 50 % of nitrogen and 70 % of potassium were transferred into the liquid phase, while move over 80 % of phosphorus was still retained in the solid phase. Liquid-phase nitrogen was predominantly nitrous nitrogen (∼60 %). It was important to note that when the temperature exceeded 200 °C, phosphorus was released in significant quantities into the liquid phase over time. This research offers valuable insights into production practices involving various raw materials, emphasizing the importance of precisely controlling reaction temperatures to effectively tailor solid and liquid fertilizers to meet specific production objectives.

186. 题目: Semi-permeable membrane coverage accelerates composting through modulated bacterial succession and organic matter transformation
文章编号: N26071113
期刊: Waste Management
作者: Fu-Sheng Sun, Chao Wang, Nader Mohamed, Lin Shi, Bo-Hao Yin, Yue-Bin Sun, Guang-Hui Yu
更新时间: 2026-07-11
摘要: Semi-permeable membrane-covered aerobic composting (SMS) has emerged as a high-efficiency technology for organic waste recycling, yet the microspatial dynamics of organic matter (OM) transformation and associated microbial drivers remain poorly characterized. This study evaluated the performance of a functional membrane-covered treatment (CM) against a non-covered control (CK) over a full composting cycle. Results demonstrated that CM significantly accelerated fermentation efficiency, achieving a final germination index (GI) of 90.1%, whereas CK reached only 81.3%. Synchrotron-based FTIR spectromicroscopy provided in situ microspatial evidence of humification heterogeneity, revealing preferential enrichment of organic functional groups within the core regions of compost particles during the thermophilic and maturation phases. Critically, CM treatment yielded a significantly higher humification index (HI = 0.82) compared to CK (HI = 0.55). High-throughput 16S rRNA sequencing revealed that CM fundamentally restructured the bacterial community, specifically enriching the genera Dietzia, Nocardiopsis, and Thermobifida. These taxa were strongly correlated with changes in organic matter composition, suggesting their pivotal role in enhancing degradation and humification. Our findings establish a microspatial and taxonomic framework for understanding OM evolution in SMS, providing a mechanistic basis for optimizing microbially regulated strategies in industrial-scale organic solid waste management.

187. 题目: Dissolved organic matter composition influences catalytic oxidation behavior and product evolution in real water matrices
文章编号: N26071112
期刊: Journal of Hazardous Materials
作者: Yujie Zhang, Rongfang Yuan, Caiyun Zhang, Hassan Waseem, Huilun Chen, Beihai Zhou
更新时间: 2026-07-11
摘要: Dissolved organic matter (DOM) strongly influences catalytic oxidation processes through complex matrix effects. Despite the widely recognized matrix effects of DOM, the relationships between DOM composition, product evolution, and transformation preference during catalytic oxidation remain poorly understood. In this study, nine water matrices with distinct DOM compositional characteristics were investigated to distinguish the effects of DOM composition from organic loading under TOC-normalized conditions during photocatalytic periodate activation. Results showed that DOM induced both promotive and inhibitory effects after eliminating concentration differences, highlighting the dominant influence of composition over abundance. Reactive species analysis indicated that DOM enhanced the contributions of hydroxyl radicals and high-valent iron species without altering the primary reactive oxygen species types. Product evolution analysis further showed that promotive samples with lower AreaTP3/AreaTP1 ratios were associated with enhanced deep oxidation, whereas inhibitory samples with higher ratios exhibited greater accumulation of local oxidation products. FT-ICR-MS analysis revealed a compositional shift of DOM toward compounds assigned to more aromatic and oxygen-enriched regions after reaction. Overall, the results demonstrate strong associations among DOM composition, catalyst surface behavior, and product evolution during catalytic oxidation in real water matrices, providing new insights into matrix effects in practical water treatment systems.

188. 题目: Iron-Modified Reed Straw Biochar for Efficient Simultaneous Removal of Cr(III) and Cr(VI): Role of Adsorption and Reduction
文章编号: N26071111
期刊: Water, Air, & Soil Pollution
作者: Yanhao Zhang, Jiyao Zhu, Xizhao Pan, Yanwei Zhong, Lei Zhang, Xu Zhang, Zhibin Zhang
更新时间: 2026-07-11
摘要: Aquatic chromium (Cr) contamination presents a persistent and severe threat to both ecological integrity and public health. This study systematically investigates the enhanced adsorption performance and mechanisms of iron-modified reed straw biochar (FeBC) for the simultaneous removal of trivalent (Cr(III)) and hexavalent chromium (Cr(VI)) from aqueous solutions. Compared to the pristine biochar (BC), FeBC exhibited significantly higher removal efficiencies, achieving 78.78% for Cr(III) and 91.45% for Cr(VI) under optimal conditions (pH 4–6). Adsorption followed the Langmuir isotherm and pseudo-second-order kinetic models, indicating monolayer chemisorption as the dominant mechanism. Thermodynamic analysis confirmed the spontaneous and endothermic nature of the process. Material characterization revealed that Fe modification substantially increased specific surface area (from 51.93 to 134.76 m2/g), pore volume, and introduced Fe₃O₄ crystals, which enhanced adsorption sites and redox activity. Collectively, these findings highlight FeBC as a highly promising and sustainable candidate for the efficient remediation of chromium-impacted water.

189. 题目: Co-application of biochar and silicon fertilizer enhances rice nutrient allocation, soil fertility, and mitigates ARG dissemination in paddy soil
文章编号: N26071110
期刊: Environmental Research
作者: Mei Wang, Shuai Li, Hongwei Xu, Qiying Huang, Zhenyu Wang, Xudong Wang, Jiawei Ma
更新时间: 2026-07-11
摘要: The restoration of soils contaminated by antibiotic resistance genes (ARGs) is essential for agricultural safety and human health. Although biochar and silicon (Si) fertilizer have been commonly applied individually as amendments for soil remediation and rice quality improvement, their combined effects remain unclear. Here, we systematically assessed the effects of the integrated application of biochar and Si fertilizer on rice nutrient uptake, soil properties, bacterial community structure and functions, and ARG abundance by conducting a 120-day pot experiment with four treatments: control (CK), 0.15 t ha-1 of Si fertilizer (SF), 3 t ha-1 of biochar (BC), and their combination (SC). The results showed that the combined treatment enhanced rice panicle length and promoted the translocation of Si and potassium to leaves, while altering the distribution of nitrogen and phosphorus in rice. In soil, co-application did not markedly alter pH, SOM, or most available nutrient levels, but significantly increased TN and TP contents. Moreover, the SC treatment resulted in the lowest abundances of detected ARGs and MGEs among all treatments. It also reshaped the bacterial community composition and functional profiles, including reduced abundance or functional contribution of key r-strategist genera associated with ARGs and nitrogen/phosphorus metabolism, such as Dinghuibacter and Roseomonas. Overall, the co-application of biochar and Si fertilizer improved rice nutrient supply, enhanced soil nutrient status, and mitigated the dissemination of ARGs. These findings provide a scientific basis for sustainable paddy field production and ARG risk management in paddy ecosystems.

190. 题目: Time-series decomposition and stream metabolism reveal benthic control on particulate organic carbon transport from mixed-use Appalachian watersheds
文章编号: N26071109
期刊: Journal of Hydrology
作者: William I Ford, James Fox, Mindy Armstead, Andrea Erhardt
更新时间: 2026-07-11
摘要: Algal carbon can be a significant energy source in stream ecosystems; however, knowledge is lacking regarding algal contributions to particulate organic carbon (POC) fluxes from mixed-use stream ecosystems and their potential implications for downstream waterways. We report a new four-year transported carbon elemental and isotopic dataset from a predominantly forested stream ecosystem in northwestern West Virginia, USA, carry out time series decomposition of the data, and compare our results to algae monitoring and ecosystem modelling to better understand the influence of algal carbon on these systems. Results show that variational mode decomposition (VMD) was more effective than empirical mode decomposition (EMD) for detecting in-stream process impacts on POC transport in the forested stream. Results from ecosystem modelling and significant modes from VMD point to benthic algal growth followed by heterotrophic stabilization resulting in residual algal C transport from the watershed during storm events as POC. The importance of the time lag and then carbon flux introduced by the algal stabilization process extends this paradigm to be inclusive of both open-canopied systems studied previously and predominantly closed-canopy systems, such as the one studied here. Contrary to results from open-canopy systems, the mixed-use Appalachian stream shows dual-peaks of algal carbon conveyance, starting in late winter-spring and again in late-summer to mid fall. Results provide evidence that mixed-use watersheds in Appalachia provide periodic contributions of labile POC enriched in algal C to the Ohio River, USA and thus merit further study regarding potential impacts on eutrophication and harmful algal blooms in the regulated rivers.

191. 题目: Argan and pine stands comparably improve soil organic matter levels and microbiome structure and function under semi-arid Mediterranean conditions
文章编号: N26071108
期刊: Plant and Soil
作者: María Patiño-García, José A Siles, José M De la Rosa, José A González-Pérez, Manuel Rubio, Pedro Martínez-Gómez, Felipe Bastida
更新时间: 2026-07-11
摘要: Background and aims Reforestation is widely promoted to mitigate soil degradation and desertification in semi-arid Mediterranean regions under future climate-change scenarios. The argan tree ( Argania spinosa ), a drought-resistant species, has been proposed as a potential alternative to pine ( Pinus halepensis). Methods We assessed soil physicochemical properties, organic matter (SOM) characteristics (content, molecular composition and thermogravimetric fractions), priming effects, microbial activity, and metagenomics-based characterization of microbial communities under argan and pine stands, compared to adjacent bare soil. Results Both argan- and pine-influenced soils showed significantly higher SOM content (12.13% and 11.74%, respectively) than bare soil (4.51%), with comparable increases in organic carbon and nutrient availability. SOM characterization revealed that vegetation cover promoted higher SOM chemical diversity and a greater proportion of labile and intermediate SOM fractions, but differences between both types of trees were subtle. Both covers induced higher priming effects than bare soil, without compromising SOM accumulation. Argan and pine induced similar taxonomic shifts in the microbial community, with Solirubrobacter predominating under both tree species, whereas Rubrobacter dominated in bare soil. Functional profiles were largely conserved between argan- and pine-influenced soil compared to bare soil, with differences limited to slight enrichments in glycan and amino acid metabolism pathways. Genes for inorganic phosphorus solubilization predominated in bare soil, whereas organic phosphorus mineralization pathways were more prevalent in vegetated soil. Conclusion Overall, argan-influenced soil exhibited physicochemical and microbial properties comparable to those under pine, supporting argan as a potential alternative for reforestation and land restoration in Mediterranean ecosystems under increasing aridity.

192. 题目: Spatial distribution, thickness characteristics, and environmental controls on soil organic carbon stocks of the mattic layer across the Qinghai-Tibetan Plateau
文章编号: N26071107
期刊: Catena
作者: Jun Gu, Ming-Liang Ye, Fei Yang, Xiao-Dong Song, Alla Yurova, Gan-Lin Zhang
更新时间: 2026-07-11
摘要: The mattic layer, a distinctive pedogenic horizon of the Qinghai-Tibetan Plateau (QTP), constitutes a substantial reservoir of soil organic carbon (SOC). However, its spatial extent, thickness variability, and the environmental controls governing these patterns remain poorly understood at the plateau scale. Here, we integrated field data from 995 soil profiles with a random forest modelling framework to quantify the spatial distribution, thickness, and SOC stock of the mattic layer across the entire QTP and to identify the dominant environmental controls. The 1-km resolution simulations indicate that the mattic layer covers approximately 591,500 km2 (23.3% of the plateau), predominantly in the central-eastern regions and the Qilian Mountains. Its distribution is concentrated within an elevation range of 3500–5200 m and a mean annual precipitation range of 430–1000 mm. Soil moisture and temperature emerged as the primary controls on mattic layer distribution, delimiting a narrow cold-mesic climatic envelope, whereas soil texture and precipitation governed thickness variation. The total SOC stock of the mattic layer was estimated at 3.09 Pg C, representing the first horizon-specific quantification of this carbon pool at the regional scale. These findings advance our understanding of the pedogenic controls on mattic layer development and provide a quantitative basis for assessing the vulnerability of this critical carbon pool to ongoing environmental change on the QTP.

193. 题目: Dissolved organic matter source-dependent ROS dynamics in covalent triazine framework photocatalysis
文章编号: N26071106
期刊: Chemical Engineering Journal
作者: Chao Zhu, Jiamin Meng, Jiaxin Wu, Haizhong Zhang, Linbo Qian, Qile Fang, Shuang Song, Yi Shen
更新时间: 2026-07-11
摘要: Porous carbon-based photocatalysts offer a promising platform for visible light-driven water treatment, yet dissolved organic matter (DOM) from natural and anthropogenic sources can substantially modulate reactive oxygen species (ROS) dynamics, affecting pollutant degradation. A systematic understanding of how DOM composition and molecular structure influence ROS generation remains limited. Here, a boron-doped covalent triazine framework (B-CTF) was employed as a model photocatalyst, with humic acid (HA) and microplastic-derived DOM (PE-DOM, PS-DOM) representing natural and anthropogenic coexisting components. Adsorption experiments revealed that B-CTF exhibited enhanced maximum adsorption capacities (qm) for HA, PE-DOM, and PS-DOM and accelerated intraparticle diffusion, demonstrating efficient DOM-catalyst interfacial interactions. ROS analysis identified 1O2 and ·OH as dominant species, strongly modulated by DOM. HA suppressed ·OH generation by 2.00 × 10−2 h−1, ∼1.0 order of magnitude higher than PE-DOM and PS-DOM, and reduced 1O2 formation nearly twofold relative to plastic-derived DOM. PS-DOM caused the strongest ·O2− inhibition (8.34 × 10−2 h−1, 3.3-fold higher than PE-DOM), while PE- and PS-DOM moderately suppressed overall ROS. Fluorescence component analysis indicated that aromatic ketones in plastic-derived DOM facilitate ROS persistence, while humic-like substances in HA promote ROS quenching, highlighting the decisive role of DOM composition in interfacial ROS regulation. These findings elucidate the mechanistic pathways by which distinct DOM types regulate energy and electron transfer at the B-CTF interface, thereby controlling ROS yields, lifetimes, and spatial distribution. They also provide quantitative guidance for designing DOM-resilient photocatalysts and developing targeted water treatment strategies.

194. 题目: Defect-engineered BiOBr/g-C3N4 heterojunction anchored on Ulva prolifera biochar for enhance photocdatalytic degradation of tetracycline
文章编号: N26071105
期刊: Environmental Research
作者: Yingchao Li, Yanan Tan, Yefei Qu, Yunyi Chen, Minggang Zheng, Zuhao Zhu, Pengcheng Zhang, Peng Ju
更新时间: 2026-07-11
摘要: Tetracycline (TC) antibiotics in water have aroused increasing concern owing to their threats to public health and ecosystems, demanding efficient and sustainable remediation strategies. Herein, we designed a visible-light-driven BiOBr/g-C3N4 heterojunction photocatalyst anchored onto biochar (PBC) produced from Ulva prolifera marine waste via a facile hydrothermal method. The resulting BiOBr/g-C3N4/PBC composite achieved complete TC degradation within 120 min under visible light, with a pseudo-first-order kinetic rate constant approximately seven times that of pure BiOBr, and a specific surface area twice that of BiOBr. Beyond degradation, the composite exhibited approximately 80% total organic carbon removal and significantly reduced the biotoxicity of TC intermediates, as confirmed by Escherichia coli inhibition zone assays. The exceptional performance stemmed from a triple synergistic mechanism wherein the type-II heterojunction enabled spatial charge separation, abundant oxygen vacancies acted as electron traps to suppress recombination, and PBC served as both an electron donor and a conductive network to accelerate interfacial charge transport. The composites demonstrated outstanding environmental robustness and anti-interference capability and maintained stable catalytic activity after five cycles. Radical trapping and ESR analyses identified ·O2− as the dominant reactive species, with h+ playing a supplementary role. The synergistic interplay of heterojunction, oxygen vacancies, and PBC's electron-donating and conductive functions collectively enabled highly efficient charge migration, thereby substantially boosting photocatalytic performance. This work not only provides a feasible strategy for marine waste valorization but also offers new insights into designing high-performance photocatalysts for water remediation.

195. 题目: Morphology-dependent photoaging behavior of polyamide fibrous microplastics: implications for fragmentation and dissolved organic matter release
文章编号: N26071104
期刊: Environmental Pollution
作者: Shaochong Liu, Yuxiao Huang, Changyin Zhu, Sitao Liu
更新时间: 2026-07-11
摘要: Fibrous microplastics (FMPs) are ubiquitous yet structurally distinct contaminants in marine ecosystems, characterized by high aspect ratios that potentially dictate their environmental fate. This study elucidates the photo-induced evolution of polyamide microfibers, revealing a morphology-governed degradation evidence. Our results demonstrate that FMPs undergo anisotropic photo-deconstruction, characterized by longitudinal cracking and hierarchical peeling, driven by the orientation of polymer chains. This process releases 3.9×107 particles/L (> 10 μm) after 480 h of simulated solar irradiation. Concurrently, a significant molecular divergence of dissolved organic matter occurs, with the preferential leaching of protein-like components over humic-like substances. While seawater halides exert a shielding effect that retards physical fragmentation, it prolongs the environmental residence time of aged fibers. These findings provide mechanistic insights into the physicochemical transformation of polyamide fibrous microplastics during photoaging and highlight the importance of fiber morphology and aquatic chemistry in regulating microplastic degradation and secondary particle release in coastal environments.

196. 题目: A quantitative statistical framework for heavy-metal removal by biochar: Unraveling metal-specific physicochemical control regimes
文章编号: N26071103
期刊: Separation and Purification Technology
作者: Kesinee Iamsaard, Girma Sisay Wolde, Chih-Huang Weng, Ying-Chen Chen, Han-Yu Hsueh, Jenn-Wen Huang, Yao-Tung Lin
更新时间: 2026-07-11
摘要: The effectiveness of biochar in removing heavy metals from aqueous solutions depends on complex interactions between surface chemistry and textural properties; however, a clear quantitative understanding of their relative contributions remains limited. This study establishes a robust, metal-specific statistical framework that links biochar physicochemical properties to targeted adsorption performance using a large dataset of 150 biochars derived from five agricultural residues. Multivariate analysis and regression-based sensitivity assessment reveal two fundamentally distinct separation regimes. The selective removal of Cu(II), Ni(II), and Zn(II) is associated with chemical factors, specifically, alkalinity and oxygen-containing functional groups, that facilitate strong inner-sphere complexation. In contrast, Cr(VI) separation is predominantly associated with physical parameters, such as surface area and pore accessibility, whereas elevated ash content markedly suppresses its uptake. This study advances adsorption science by transitioning from empirical correlations to a quantitative, predictive hierarchy, offering practical guidance for designing application-specific adsorbents and laying the groundwork for data-linked separation process optimization. The application of the framework to alternative biochar feedstocks should be approached with caution and necessitates additional validation using more extensive datasets that include diverse feedstock types and production conditions.

197. 题目: Biorefinery-Oriented Oxidative Polymerization Drives Hydrothermal Humification toward Functional Humic Structures via Phenol−Furan Radical Coupling
文章编号: N26071102
期刊: ACS Sustainable Chemistry & Engineering
作者: Wei Wang, Lei Zhang, Jianan Liu, Yinxia Chang
更新时间: 2026-07-11
摘要: Hydrothermal processing of lignocellulosic biomass generates aqueous streams enriched in phenolic and furanic intermediates, but these dissolved carbon species are commonly lost through oxidative degradation. Here, we developed an organic radical-mediated humification strategy driven by thermally activated persulfate, which redirects dissolved carbon into humic acid-like substances (HALs) with cross-linked aromatic−heterocyclic structures through phenol−furan coupling rather than oxidative mineralization to CO2. Under acid-alkaline pretreatment that enhances precursor release, the HAL yield reached 61.43%, significantly higher than the 6.32−7.78% obtained from single-condition pretreatments. This pathway retained 81.1% of biomass carbon in products, including 75.9% in HALs and 5.2% in coproducts, while only 18.9% was released as CO2. The process simultaneously enabled detoxification and carbon retention, removing 88−100% of benzenoid aromatics and 98−100% of furanic compounds while preserving 48.3−87.2% of bioavailable substrates. Ultrahigh-performance liquid chromatography−electrospray ionization−mass spectrometry resolved oligomer series indicative of chain-growth incorporation, and pyrolysis−gas chromatography−mass spectrometry confirmed aryl-furan connectivity, supporting the formation of π-conjugated, redox-active aromatic−heterocyclic networks. Density functional theory calculations showed that phenol−furan radical coupling lowers the activation barrier from 96.5 to 10.1 kcal mol−1, enabling efficient C−C/C−O bond formation and polymer growth. Process simulation at a biomass feed rate of 10,000 kg/h projected a HAL production of 6143 kg/h; technoeconomic analysis further indicated favorable economic performance, with an internal rate of return of 53.6%, a discounted payback period of 3.9 years, and a net present value of 15.0 billion CNY. These findings establish a carbon-retentive pathway that transforms hydrothermal wastewater from a waste stream into a precursor platform for functional carbon materials in circular biorefineries.

198. 题目: The organic carbon burial history of the paleo-Yangtze delta in response to depositional evolution driven by climate and sea-level changes since MIS 3
文章编号: N26071101
期刊: Palaeogeography, Palaeoclimatology, Palaeoecology
作者: Lei Gao, Liangtao Ye, Yanmei Yao, Xiaohua Zhou, Ren Jiang, Hao Long
更新时间: 2026-07-11
摘要: Elucidating the long-term spatiotemporal dynamics of organic carbon (OC) burial in coastal sediments is essential for constraining the contribution of sedimentary OC stocks to Earth's climate system. Nevertheless, the distribution characteristics and driving mechanisms governing coastal OC burial, in comparison with open ocean and deep-sea environments, remain poorly constrained, hindering accurate quantification of global OC burial budgets in marine sediments. To address this gap, we investigated organic carbon accumulation rates (OCARs) based on two sediment cores (YZ07 and YZ05) retrieved from the paleo-Yangtze Delta, reconstructing the evolutionary history of OC burial across the delta-shelf continuum since Marine Isotope Stage (MIS) 3. Our results indicate that intervals of enhanced OC burial in this system since MIS 3 are not persistently coupled to previously documented high sea-level stands or transgressive events. The maximum apparent OCAR (~169.9 g C m−2 yr−1) was recorded in lower intertidal to shallow marine environments around 0.9–1.4 ka, while a secondary high apparent OCAR (~100.1 g C m−2 yr−1) occurred within a confined paleo-estuary on the inner shelf during 37.6–38.8 ka. These elevated OCARs are predominantly driven by increased sedimentation rates (SRs), which are closely associated with proximity to the paleo-depocenters and intense sediment supply. In contrast, the lowest OCARs were observed in fluvial and tide-influenced fluvial channel environments during the middle to late MIS 3. This pattern is likely attributed to energetic hydrodynamic conditions and distal positions relative to depocenters, which suppressed sediment accumulation and thereby limited OCAR magnitudes. Overall, OCAR variations in the paleo-Yangtze Delta exhibit a low-low-high succession in the modern delta-plain region and a high-low-moderate trend in the present inner shelf throughout the MIS 3–1 interval. These observations demonstrate that the stratigraphic and depositional evolution of the paleo-Yangtze delta serves as the primary control on OC burial fluxes across the delta-shelf continuum since MIS 3. Notably, the late Holocene OCAR peak represents a mixed signal of natural variability and anthropogenic perturbation, driven by intensified human activities over recent millennia. Investigating spatiotemporal OCAR variations in typical deltaic coastal systems, such as the paleo-Yangtze Delta, can improve the accuracy of regional and global estimates of coastal OC burial on geological timescales. Our findings also highlight the necessity of preserving the stability of coastal depositional systems to constrain the potential release of sedimentary OC into the atmosphere.

199. 题目: Molecular Coordination Mechanisms of Yttrium (III) with Black Humic Acid Derived from Excess Sludge: Spectroscopic and Theoretical Analysis
文章编号: N26071019
期刊: Journal of Environmental Chemical Engineering
作者: Junfeng Wang, Chunyan Yang, Chengyi Guo, Yihong Sun, Jiatao Yang, Changming Zhong
更新时间: 2026-07-10
摘要: Yttrium, a rare earth element with substantial reserves and extensive industrial applications, generates environmental and resource challenges through mining wastewater containing low-concentration ions, necessitating sustainable recovery strategies. In this paper, black humic acid (HM) was extracted from excess sludge via alkali-soluble acid precipitation and employed as a bio-based precipitant for recovery of rare earths (with Y3+as a representative ion) from low-concentration wastewater. Solid-state 13NMR revealed that HM possesses high Ali phaticity, pronounced aromaticity, and abundant oxygen-containing functional groups including carboxyl, alcohol hydroxyl and carbonyl. SEM/EDS analysis confirmed effective Y3+ enrichment within HM-Y precipitates, which exhibited irregular cubic morphologies with rough surfaces. Crucially, combined XPS and FT-IR analyses with peak fitting provide strong evidence for that Y3+ coordinates with HM through a hierarchical mechanism: carboxyl and alcohol hydroxyl groups serve as the primary coordination sites, while carbonyl plays an auxiliary role. This coordination hierarchy—suggest a hierarchical preference for sludge-derived HM—reveals that carboxyl and hydroxyl/ether oxygen groups dominate Y3+ binding over carbonyl groups. These findings provide molecular insights into the selective binding of rare earth ions by sludge-derived humic acid, supporting its use as a sustainable precipitant for rare earth recovery.

200. 题目: Composition-dependent ion transport in extracellular polymeric substance-intercalated MXene membranes for osmotic power generation
文章编号: N26071018
期刊: Journal of Membrane Science
作者: Da-Qi Cao, Xiao-Yu Song, Bi-Xiao Xu, Kai Tang, Xiao-Di Hao, Wen-Yu Zhang, Zhongguo Zhang, Rongling Wu
更新时间: 2026-07-10
摘要: Extracellular polymeric substances (EPSs) derived from waste sludge are promising sustainable bio-intercalants for two-dimensional (2D) MXene membranes in osmotic energy harvesting. However, the impact of the inherent compositional heterogeneity of EPS on membrane performance remains elusive. This study fabricated MXene membranes intercalated with EPS derived from four sludge sources via four extraction methods. The results demonstrate that the biological source, which dictates the protein-to-polysaccharide (PN/PS) mass ratio, exerts a more dominant influence on reverse electrodialysis (RED) performance than the extraction protocol. Specifically, the power density positively correlates with the PN/PS ratio in EPS extracted via the cation exchange resin method. By structurally decoupling this complex mixture, the membranes intercalated with isolated PN and PS fractions (PN@M and PS@M) delivered comparable power densities of 6.38 and 6.35 W/m2, respectively, effectively doubling the performance of the pristine MXene membrane. Structural and electrochemical analyses revealed a distinct functional divergence: PN primarily enhances ion permselectivity via interfacial charge modulation, whereas PS facilitates higher ion permeability by creating a highly hydrated interlayer environment. Furthermore, RED performance is highly sensitive to the electrolyte type, with both voltage and current exhibiting a strong positive correlation with the bulk diffusion coefficients of the cations. Consequently, the power density reached a maximum of 7.78 W/m2 in a KCl system. Additionally, EPS intercalation introduces robust hydrogen bonding and electrostatic interactions, stabilizing the MXene structure against water-induced swelling while optimizing the surface charge and hydrophilicity. This work transitions the understanding of EPS application in 2D membranes from a “holistic black-box” to key functional components, providing rational guidance for designing waste-derived intercalated membranes.