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1. 题目: Composition and contribution of disinfection by-product precursors in dissolved organic matter leached from aquatic plant residues
文章编号: N25070706
期刊: Journal of Environmental Chemical Engineering
作者: Jiachang Pi, Tingting Gong, Lei Gao, Xin Li, Yongze Lu, Hongyang Wang, Guangcan Zhu
更新时间: 2025-07-07
摘要: Decaying aquatic plant residues represent a significant dissolved organic matter (DOM) source in aquatic systems, serving as key precursors for disinfection by-product (DBP) formation. Although numerous studies have indicated that plant-derived DOM possesses high DBP formation potential, the predominant types and quantities of DBP precursors in DOM remain unknown. We identified the major DBP precursors present in DOM derived from common aquatic plants in reservoirs during winter and assessed their contributions to DBP formation. Haloacetic acids constituted the predominant class of aliphatic DBPs generated from aquatic plant-derived DOM upon disinfection, followed by trihalomethanes, chloral hydrate, and haloketones. Using fourier transform ion cyclotron resonance mass spectrometry technology, 339, 145, and 205 molecular formulas containing Cl/Br were detected in the DOM from the residues of Lythrum salicaria, Acorus calamus, and Phragmites communis. The molecular formulas with the highest peak intensities were C₁₄H₂₁O₅SCl, C₂₀H₃₅O₂Cl₅, and C₁₄H₂₁O₅SCl, respectively. This study conducted a quantitative analysis and identification of the two main DBP precursor components in DOM: lignins and tannins. The high tannin content, up to 35%, in the DOM leached from L. salicaria may be due to its relatively rigid xylem structure compared to the other two aquatic plants. Tannins were the most critical precursors for dichloroacetic acid, making significant contributions to the dichloroacetic acid formation potential (34–83%). Lignin was found to be a more important precursor than tannins for trichloromethane and chloral hydrate formation. This study establishes quantitative methods for determining lignin and tannin fractions in DOM and evaluating the contributions of these two major DBP precursors to DBP formation.

2. 题目: The impact of land use on the composition of dissolved organic matter and its relationship with microbes in a river basin in Northwestern China: Insights into microbial community structure and metabolic function.
文章编号: N25070705
期刊: Journal of Environmental Management
作者: Xiang Zhu, Xinhua Gao, Yueming Zhu, Jingjie Huang, Fuquan Peng, Qingqing Pang, Fei Yang, Lei Xie, Zulin Hua, Longmian Wang
更新时间: 2025-07-07
摘要: Land use variations influence aquatic dissolved organic matter (DOM); however, the responses of relationships between DOM composition and microbial communities/metabolic genes to land use types and landscape indices remain insufficiently explored. This study conducted four field sampling sessions on the Qingshui River, northwestern China, investigated the shifts in DOM-transforming microbes and genes under distinct land use patterns (forest & grassland, urban area, and agricultural land) using metagenomics analysis, elucidated the DOM-microbe interactions in response to land use characteristics from the perspective of both basin and land use types by statistical approaches. At the basin scale, land use primarily influenced DOM quality rather than quantity. Partial least-squares path model demonstrated that landscape indices influenced DOM components predominantly by inhibiting gene abundances associated with metabolic pathways, exerting a more pronounced impact than land use area proportions. Notably, DOM composition, microbial metabolic genes, and their interactions differed significantly across land use types. Urban areas exhibited the highest levels of DOM aromaticity and the largest proportions of autochthonous sources, their fragmented landscape characteristics destabilized the microbial network, resulting in a comprehensive rather than partial suppression of genes involved in DOM transformation pathways (carbohydrate metabolism, energy metabolism, and amino acid metabolism). Compared to other land use scenarios, the downstream agricultural areas emerged as active zones for microbial utilization of DOM, maintained high microbial network stability and gene abundances similar to forest & grassland, highlighting the microbial resilience. These insights advance mechanistic understanding of how land use governs aquatic DOM-microbe interactions in arid and semi-arid watersheds.

3. 题目: Straw return strategies for soil microbial quotient enhancement: Insights from DOM vertical distribution characteristics
文章编号: N25070704
期刊: Agriculture, Ecosystems & Environment
作者: Yuanchen Zhu, Wei Yang, Juanjuan Qu, Yue Jiang, Ying Zhao, Zhimin Wu, Jie Su, Xiaozeng Han, Wenxiu Zou
更新时间: 2025-07-07
摘要: The soil microbial quotient (SMQ), a critical indicator of agricultural soil quality, exhibits significant responsiveness to dissolved organic matter (DOM). However, how the heterogeneity of DOM characteristics regulates the SMQ remains unclear, despite DOM being a critical energy source for microorganisms. We conducted a field experiment with four treatments: conventional tillage (CT), no-tillage with straw mulch (NTS), conventional tillage with straw mulch and incorporation (CTS), and deep tillage with straw incorporation (DTS), with soil samples collected at four depth intervals (0–10, 10–20, 20–30, and 30–40cm) to investigate how DOM characteristics influence SMQ. The results indicated that SMQ declined with soil depth. Straw return enhanced SMQ, with effectiveness ordered as CTS > NTS > DTS > CT. Compared to CT, straw return increased the content and humic-like components of DOM. Additionally, NTS and CTS accelerated depth-dependent variations in protein-like substances, whereas DTS promoted those in humic-like substances. Linear regression analysis showed that SMQ was positively correlated with both dissolved organic carbon and humic-like components of DOM. Random Forest analysis showed that soil enzyme activities and nutrients dominated SMQ regulation in the 0–20cm layer, while DOM characteristics governed SMQ in the 20–40cm layer. Among all treatments, CTS was identified as the most effective in enhancing SMQ. These findings elucidate the DOM-mediated mechanism of SMQ regulation under straw return, providing a scientific basis for optimizing agricultural management practices.

4. 题目: Fe-mediated DOM components drive effective arsenic immobilization in tea plantation soils: Mechanisms and quantitative insights.
文章编号: N25070703
期刊: Ecotoxicology and Environmental Safety
作者: Jingyi Zhang, Youru Yao, Jiahe Miao, Kaipian Shi, Fengman Fang, Yuesheng Lin, Zhiming Zhang, Qing Ji
更新时间: 2025-07-07
摘要: In iron (Fe)-rich tea plantation environments, the composition and behaviour of dissolved organic matter (DOM) differ markedly from those observed in other land use systems. Despite its importance, research on DOM in tea plantation soils remains limited, particularly with regard to its role in the transport and transformation of heavy metals, component-specific interactions and the quantification of environmental thresholds. This study examined the composition and fluorescence characteristics of DOM in surface soils, and quantified its Fe-mediated interactions with arsenic (As) under real-world tea plantation conditions. The results revealed that soil DOM in these environments exhibits low humification, high bioavailability and a predominantly terrestrial origin. Five distinct DOM components were identified, falling into two categories: humic acid-like and protein-like substances. A significant negative correlation was observed between soil As and Fe concentrations. Notably, in soils with high Fe levels (33,000 mg/kg), the presence of DOM reduced As concentrations by up to 53.6 %. This reduction is attributed to the rich array of adsorption sites in DOM, which influence Fe redox processes by facilitating the reduction of As(V) and promoting the formation of insoluble Fe-As precipitates through complexation. These findings enhance our understanding of DOM composition in tea plantation soils and shed new light on the environmental interactions among DOM, Fe and As. Such insights are crucial for assessing As mobility, enhancing soil quality monitoring in tea-growing regions and promoting the sustainable growth of the tea industry.

5. 题目: Biochar reduces microbial fertilizer-induced microbial community stability by weakening heterogeneous selection in poplar plantation soil
文章编号: N25070702
期刊: Forest Ecology and Management
作者: Minmin Cao, Qi Lu, Lina Cui, Genmei Wang, Xiang Zheng, Dun Wang, Yinuo Kong, Ye tian, Luozhong Tang, Huanchao Zhang
更新时间: 2025-07-07
摘要: Microbial fertilizers and biochar affect plant growth and soil properties, while their combined effects on soil microbial communities remain inadequately understood. This study examined two factors: different microbial fertilizers (no microbial fertilizers: CK; Bacillus subtilis: M1; compound Bacillus: M2) and biochar application (without biochar: NB, with biochar: B). Focusing on the response mechanisms of soil microbial communities, this study systematically evaluated the long-term maintenance of soil fertility in poplar plantations under the combined application of microbial fertilizers and biochar. Our results revealed that microbial fertilizers decreased soil total phosphorus (TP) and dissolved organic carbon (DOC), whereas biochar increased total potassium (TK) and available phosphorus (AP). Both microbial fertilizers and biochar independently promoted microbial diversity and altered community composition at the genus level. Compound microbial fertilizers increased the influence of heterogeneous selection on bacterial community assembly and enhanced microbial network complexity and stability. However, co-application of biochar with compound microbial fertilizers reduced the influence of heterogeneous selection and diminished microbial network complexity and stability. The relationship between soil properties and microbial communities varied significantly depending on fertilization, biochar application, and their interaction. These findings elucidate the mechanisms underlying microbial community responses to biochar–microbial fertilizer interactions and highlight the trade-offs between improving soil nutrient availability and preserving microbial ecological stability. This study provides a theoretical foundation and practical guidance for designing microbial amendments in forest ecosystems and offers insights into optimizing fertilization strategies to support long-term soil fertility and microbial sustainability in plantation management.

6. 题目: Soil Carbon Dynamics During Stand Rotation in Boreal Forests
文章编号: N25070701
期刊: European Journal of Soil Science
作者: Lorenzo Menichetti, Aleksi Lehtonen, Antti‐Jussi Lindroos, Päivi Merilä, Saija Huuskonen, Liisa Ukonmaanaho, Raisa Mäkipää
更新时间: 2025-07-07
摘要: The utilisation of forest resources is frequently criticised for its adverse environmental impacts. In particular, the widespread use of rotation forestry practices, including clear‐cutting, is viewed as a threat to ecosystems. Clear‐cutting has short‐term impacts that turn the forest into a net carbon (C) source, but such modifications to the ecosystem also have long‐term effects. Any analyses of alternative management approaches should include at least one full rotation, which requires model extrapolations. In this study, we used data from a well‐documented series of long‐term forest monitoring sites in Finland (ICP Forests Level II), focusing on two recent clear‐cut sites—one dominated by Scots pine and the other by Norway spruce. These data were utilised to constrain a soil C model and to extrapolate two future scenarios: rotation forestry and set‐aside (unmanaged). We simulated these scenarios over a period exceeding one full rotation and compared the outcomes. Although the stand thinning events did not heavily affect the C balance of the studied sites, clear‐cutting did. Each clear‐cut event caused a negative soil organic carbon (SOC) balance for many decades. It took between 37 and 69 years (for Norway spruce and Scots pine, respectively) to reach a break‐even point in which soil C losses compensated for C uptake. Emissions from coarse harvest residuals represented the greatest C source after clear‐cutting, followed by fine roots and then foliage. When comparing such a scenario with a set‐aside scenario, the soil C budget of the managed stand after clear‐cut was negative until the first thinning or even until the following clear‐cut, while the set‐aside was always a C sink in soil. Thus, scenario analyses of forest C sequestration that disregard long‐term soil C dynamics following management interventions may lead to biased conclusions. As a management regime, rotation forestry was relatively ineffective when evaluated considering C sequestration as an important ecosystem service.

7. 题目: Seasonal changes-facilitated release of phosphorus and tungsten from the Lake Taihu sediments through reductive dissolution of Fe/Mn (hydr)oxides and competitive adsorption with dissolved organic matter
文章编号: N25070609
期刊: Environmental Pollution
作者: Xiang Chen, Yan Wang, Minjuan Li, Xiangyu He, Qi Li, Junliang Jin, Tingfeng Wu, Yichun Shao, Jingwei Wu, Gaoxiang Li, Ling Liu, Wenming Yan
更新时间: 2025-07-06
摘要: The release of phosphorus (P) and tungsten (W) from sediments can contribute to eutrophication and heavy metal contamination in water bodies, respectively. This study simultaneously investigated the seasonal variation characteristics of P and W in sediments in Meiliang Bay, China. The results indicated that seasonal variations in pH, dissolved oxygen (DO), and temperature (T) at the sediment–water interface influenced the P and W composition as well as their release from sediments. The diffusion fluxes of soluble reactive phosphorus (SRP) and soluble W (except in winter) were 0.145–2.881 mg⋅m⁻²⋅d⁻¹ and 1.785–3.006 μg⋅m⁻²⋅d⁻¹, respectively, indicating that the sediments served as a source of P and W. In autumn, the diffusion fluxes of SRP (2.881 mg⋅m⁻²⋅d⁻¹) and soluble W (3.006 μg⋅m⁻²⋅d⁻¹) were significantly higher than in winter (0.147 mg⋅m⁻²⋅d⁻¹ and −0.048 μg⋅m⁻²⋅d⁻¹, respectively). The concentration of SRP and soluble W in winter (0.20 mg⋅L⁻¹ and 0.22 μg⋅L⁻¹, respectively) were significantly lower than in autumn (1.57 mg⋅L⁻¹ and 1.39 μg⋅L⁻¹, respectively). These results suggest that under high temperatures and cyanobacteria degradation, sediments release more SRP, soluble W, Fe(Ⅱ), Mn, and dissolved organic matter (DOM). The significant positive correlations among SRP, soluble W, Fe, Mn, and DOM and their consistent trends in the top 20 mm of the sediment indicate that the main processes causing the release of P and W from sediments are competitive adsorption by DOM and redox reactions of Fe (III)/Mn (IV) oxyhydroxides. This study is of great practical significance for simultaneously addressing lake eutrophication and heavy metal pollution.

8. 题目: Long-term effects of short-term functional membrane covering on humification process and carbohydrate-active enzymes during dairy manure composting at industrial scale
文章编号: N25070608
期刊: Journal of Environmental Chemical Engineering
作者: Muqing Zhan, Ya Su, Qianting Zhuo, Sanwei Yang, Haochen Shao, Chen Fang
更新时间: 2025-07-06
摘要: Microorganisms promote the formation of humus through the secretion of carbohydrate-active enzymes (CAZymes). Functional membrane covering composting is an effective measure to improve oxygen utilization rate and reduce carbon emissions, but its regulatory mechanism on CAZymes is still unclear. This study compared the dynamic changes in microbial communities and CAZyme genes in static composting (CK), trough composting (TC), and functional membrane covering composting (FC), and explored the influence of a micro-positive pressure environment on humus formation. The results showed that the humic acid content on day 6 in the FC group was 2.19 times and 3.68 times that of the TC and CK groups, respectively, indicating a significant increase in humic acid under the micro-positive pressure environment. GT4 was the most abundant CAZymes family, and its abundance in FC, TC and CK groups at day 6 increased by 21.71%, 4.76% and 5.19% respectively compared with that at day 0. Moreover, microbial diversity and auxiliary activity enzymes increased significantly in the FC group. Network analysis showed that the synergy of CAZyme families in the FC group was also strengthened. Mantel test analysis indicated that the improvement of the aerobic environment was a key factor promoting the humification. In conclusion, functional membrane covering composting is a novel strategy for accelerating the humification process by regulating the CAZyme family structure.

9. 题目: Mixed matrix membrane of Pebax-1657 incorporated with H2O2-modified ball-milled biochar for enhanced CO2 separation
文章编号: N25070607
期刊: Environmental Research
作者: Yinzi Shao, Xueyang Zhang, Wenyi Tan, Yan Zhao, Feiyue Li, Bin Gao
更新时间: 2025-07-06
摘要: Biochar derived from wheat straw was prepared and subsequently modified with hydrogen peroxide through ball milling, yielding ball-milled wheat straw biochar (BMWB). BMWB/Pebax mixed matrix membranes (MMMs) were prepared by incorporating BMWB into Pebax-1657, and their CO₂ separation performance was evaluated. The results showed that ball milling successfully reduced the biochar particle size, increased its specific surface area, and strengthened the intensity of surface functional groups. Furthermore, hydrogen peroxide modification augmented the oxygen-containing functional groups on the biochar surface, enhancing its hydrophilicity and improving its dispersion within the Pebax-1657. Under the experimental conditions of 25°C and 0.2 MPa, the MMMs loaded with 3 wt% BMWB exhibited significantly enhanced gas separation performance, with a CO₂ permeability of 97.75 Barrer and CO₂/N₂ selectivity of 62.3. These values represent substantial improvements of 38.8% and 32.8%, respectively, compared to the pristine Pebax-1657 membrane. This enhanced separation performance can be ascribed to two primary factors: (1) the presents of abundant functional groups (e.g., carboxyl and amino groups) on BMWB significantly improved CO₂ affinity; and (2) the intrinsic gas transport channels within BMWB, combined with the tortuous pathways generated by the effective stacking of BMWB particles, synergistically enhanced both CO₂ permeability and selectivity.

10. 题目: A universal model to predict DOC removal by coagulation based on UV-Visible absorption spectrum
文章编号: N25070606
期刊: Water Research
作者: Yang Deng, Hanzhe Wang, Lei Zheng, Zhongli Liu, Gregory V Korshin, Mingquan Yan
更新时间: 2025-07-06
摘要: Dissolved organic matter (DOM) universally present in drinking water reacts with chlorine-based disinfectants to form disinfection byproducts (DBPs) such as trihalomethanes (THMs), haloacetic acids (HAAs) and other potentially more toxic compounds. Given that DOM removal is the primary goal of drinking water treatment, establishing models to predict DOM removal by coagulation is crucial for intelligent control in drinking water treatment plants (DWTPs). However, due to the lack of online methods for characterizing DOM reactivity in coagulation, predicting its performance for various water sources and variations of applicable seasonal conditions remains a great challenge. This study demonstrates that while DOC removal exhibits significant variations, it is primarily determined by the maximum DOC concentration removable by coagulation (DOC_max), the alkalinity in source waters, coagulant type and its dosage. The main finding of this study is that DOC_max can be determined based on the properties of absorbance Band A₃, identified as a deconvoluted Gaussian band within the Ultraviolet-Visible (UV-Vis) absorbance spectra of DOM, with the Band A₃ maximum near 350 nm (R² = 0.84). This result allows developing a universal model that accurately predicts, based on UV-Vis absorbance spectra of source waters, DOC removal by coagulation for a wide range of source conditions, alkalinity, and coagulant dosage (R² = 0.93). These insights can be used to develop smart dosing systems for control of coagulation in DWTPs.

11. 题目: Changes in the complexation behavior of Cadmium with dissolved organic matter in the Huaihe River basin: Environmental drivers, regional differences and socio-economic impacts
文章编号: N25070605
期刊: Environmental Research
作者: Zhangzhao Wang, Fan Feng, Dongping Liu, Hongjie Gao, Qingqian Li, Huibin Yu
更新时间: 2025-07-06
摘要: The mobility of Cd (II) in aquatic ecosystems is significantly influenced by its complexation with dissolved organic matter (DOM), but the impact of multidimensional factors on this complexation process remains poorly understood. This study examined Cd (II) binding of DOM from four distinct regions—agricultural (AgriDOM), industrial (IndDOM), wetland (WetDOM), and estuarine (EstDOM)—in a pollution-entwined, agro-saturated river. Analysis was performed using fluorescence excitation-emission matrix spectroscopy (EEM), principal component coefficients, parallel factor analysis (PARAFAC), moving-window two-dimensional correlation spectroscopy (MW2DCOS), and structural equation modeling (SEM). Five components were extracted from the titrants through EEM-PARAFAC (fluorescence excitation-emission matrix spectroscopy- parallel factor analyses), i.e., tryptophan-like substances (C1), photochemical products of terrestrial organic matter (C2), microbial humic-like component (C3), fulvic-like substance (C4), humic-like components (C5). C1 originated from wastewater and is significantly influenced by biological activity. C2 exhibited sensitivity to Cd (II) in regions with active photodegradation (AgriDOM, WetDOM). Agricultural activities mobilized C3, enhancing its complexation with Cd (II). Increased runoff from irrigation and drainage promoted a higher binding affinity of C4 for Cd (II). C5, derived from wastewater, declined in estuarine and high-salinity environments. In AgriDOM and IndDOM, Cd (II) preferentially associated with C5 and C4, reducing its mobility and facilitating its stabilization in soil. Within WetDOM and EstDOM, Cd (II) primarily bound to C1, markedly enhancing its mobility. The socio-economic condition of a region influences water environmental factors, thereby affecting the complexation behavior of Cd (II) with DOM. Agricultural activities reduce Cd (II) mobility, while industrial growth enhances its mobility through elevated GDP-P. The Huaihe River basin's industrial transformation toward greener, low-carbon practices has reduced pollution, demonstrating a negative correlation between economic growth and pollution levels, aided by improved environmental infrastructure. This study may provide a new perspective and framework for understanding and addressing Cd (II) contamination remediation.

12. 题目: Excited Triplet Humic Acid Boosts UVA-Activated Periodate (PI) Oxidation Process for Enhanced Micropollutant Degradation.
文章编号: N25070604
期刊: Environmental Science & Technology
作者: Juan Li, Xiangyang Hou, Peng Su, Yuqi Sun, Wenqi Li, Chenlong Liu, Qixiao Lv, Wenjun Zhang, Tao Yang
更新时间: 2025-07-06
摘要: Activation of periodate (PI) by ultraviolet radiation at the UVA range (UVA/PI) is promising for the oxidative treatment of emerging contaminants in aqueous environments. This study is the first to uncover the inherent mechanisms of the enhancing effects of humic acid (HA) on the UVA/PI process. Accelerated degradation of the model compound naproxen (NAP) and six other structurally diverse compounds was observed, with enhancement factors of first-order rate constants varying from 1.2 to 5.5 in the presence of 2 mgC/L HA. The excited triplet of HA (3HA*), generated from HA photolysis, was identified as the dominant intermediate, and it reacts rapidly with PI at a diffusion-controlled second-order rate constant of about 1.19 × 109 M-1s-1. This interaction led to the generation of the hydroxyl radical (•OH) and ozone (O3), with •OH as the predominant oxidant responsible for over 70% of NAP degradation. Aromatic ketone moieties within HA were potential triplet candidates, as suggested by the model triplet sensitizer. Additionally, Suwannee River natural organic matter (SRNOM) was found to similarly enhance the performance of the UVA/PI process, indicating that this effect may extend to other natural organic matter sources. This study offers a novel perspective on PI-based advanced oxidation processes, revealing that HA can serve as an in situ enhancer to drive pollutant degradation with reduced reliance on chemical activators. This work not only advances the understanding of UVA/PI processes but also proposes a sustainable approach for optimizing water treatment systems.

13. 题目: Role and mechanism of combination of biochar and electroactive microbial consortium in facilitating methanogenesis
文章编号: N25070603
期刊: Chemical Engineering Journal
作者: Kai-Zhao Wang, Zi-Fan Wu, Yu-Hong Qiu, Zhi-Man Yang
更新时间: 2025-07-06
摘要: Augmentation with either biochar or electroactive microbial consortium (EMC) has been applied to enhance the anaerobic digestion (AD) performance, yet the combined effectiveness of biochar together with EMC remains unknown. Here, the objective of this work was to investigate how the combination of biochar and EMC (CBE) impacted methanogenesis. To do this, two different augmentation patterns were investigated in the batch mesophilic AD systems, namely biochar, EMC and CBE were individually added at the start-up or acidogenic stage of AD. The results showed that augmentation with biochar, EMC and CBE facilitated methanogenesis remarkably compared to control (non-augmentation) under two augmentation patterns. CBE outperformed biochar and EMC in boosting methanogenesis at each augmentation pattern due to their synergistic interaction. The CBE augmentation offered a favorable environment for maintaining the survival, growth and activity of DMER64 and Methanosaeta in EMC and helped them establish direct interspecies electron transfer (DIET), thereby causing an increase in methane yield and maximum methane production rate by average 59% and 140% compared to augmentation with biochar and EMC, respectively. In comparison to CBE augmented at the start-up stage, CBE augmented at the acidogenic stage had a better performance in strengthening the DIET-based syntrophic metabolism, possibly due to the enhancement of DIET-based CO₂-dependent methanogenesis, VFA metabolism and energy supply. It was concluded that the CBE strategy is a promising approach to promote the methanogenic efficiency in AD of kitchen waste or other perishable biomass wastes.

14. 题目: Monoatomic Fe-N2O2 sites and carboxyl groups in biochar synergistically driving HV-Fe(IV) dominated peroxymonosulfate activation for anilines degradation
文章编号: N25070602
期刊: Chemical Engineering Journal
作者: Ting Zhou, Wenyi Dong, Xuechuan Li, Weigang Liu, Mengke Qiang, Hongjie Wang
更新时间: 2025-07-06
摘要: High-valent ferric oxide species (HV-Fe(IV)) has been increasingly explored to selectively and efficiently remove pollutants from wastewater owing to its high reduction potential, long lifetime, and valuable resistance to anions. However, the directional production of HV-Fe(IV) and its mechanism remain challenging. Herein, a biochar-based catalyst with monoatomic Fe-trans-N₂O₂ configuration and rich COOH group (SAFe-NKBC) was rationally constructed via KOH and supramolecular organic framework co-pyrolysis. As a result, the SAFe-NKBC/PMS system exhibited exceptional catalytic performance, achieving rapid sulfamethoxazole degradation (97.4% within 10 min) and TOC removal (73.1%). Mechanistic investigations revealed the cooperative catalytic role of single-atom Fe-trans-N₂O₂ and COOH in biochar support via surface-confinement effect in boosting peroxymonosulfate activation and directional HV-Fe(IV) generation, mediating spatially coupled electron transfer and promoting selective oxidation pathways. Furthermore, a structure–activity relationship for various para-substituted anilines was systematically established via quantitative structure–activity relationship modeling based on different adsorption and oxidation descriptors. The valid descriptors were confirmed to predict reactivity, offering a molecular-level framework for water purification. Meanwhile, the catalyst demonstrated excellent resistance to matrix interference, long-term stability in flow-through systems, and significantly reduced toxicity of degradation byproducts, underscoring its potential in sustainable and precision-oriented water remediation. This work offered new insights into rational SAC design and reactivity prediction for sustainable water remediation.

15. 题目: Binary Ca/Mn based carbonaceous feathery light foam for ‘hypersorb’ phosphate removal: Unravelling pragmatic and mechanistic insights, dissolved organic matter implications and Machine learning predictive modelling
文章编号: N25070601
期刊: Separation and Purification Technology
作者: Tharanyalakshmi Ravi, M P Saravanakumar
更新时间: 2025-07-06
摘要: The surplus phosphate (P) in aqueous stream primes to eutrophication, disrupting the ecosystem and public wellness. To evade it, an adsorption process was deployed by facile synthesised binary calcium (Ca)/manganese (Mn) carbon foam with starch (BCF-(Ca-Mn)st. It has high specific surface area with extreme porous structure that aids in P adsorption. The maximal P adsorption, $q_{\mathit{max}}$$q_{\mathit{max}}$ is 73.91 mg/g with the removal rate 91.5 % at the optimum parameters of pH 11, dosage 0.04 g and initial concentration $C_o$$C_o$ 20 mg/L within the equilibrium period of 5mins. Thus the ‘hypersorb’ P adsorption achieved mainly in the form of HPO₄^2- tailed by PO₄^3- and H₂PO₄^-. Also, the predominant mechanism for adsorbing P was ligand interaction, chemisorption, physisorption, surface precipitation and surface complexity. Additionally, this study emphasized the inhibitory effect of humic acid, HA (exemplifies DOM) on P to ensure its concurrent and solitary removal by BCF-(Ca-Mn)st. The findings implied that, at an initial HA concentration of 10 mg/L, the maximal removal efficiency attained was 88.41 % of P and 67.66 % of HA solely. Further, the adsorptive potent of BCF-(Ca-Mn)st for both P and DOM is justified by several indicators notably aromaticity Ar@254 nm, absorbance Abs@355 nm, E2/E3 and E2/E4. Finally, varied machine learning prediction models built on diverse algorithms were applied for the P adsorption. Also, the robustness and sensitivity of the models were verified at various noise levels from ±2.5 % to ±10 %. Relying on evaluation metrics, the SVR-RBF emerged as the most robust in both model optimisation and up to ±7.5 % noise infusion than other algorithms.

16. 题目: Enhanced Cr(VI) Removal via Surfactant-Tailored Magnetic Functionalized-biochar: Synergistic Alkyl Grafting and Iron Dispersion for Broad-Spectrum pH Adaptability
文章编号: N25070515
期刊: Journal of Environmental Chemical Engineering
作者: Mingxia Ye, Ziyi Li, Liangyan Wen, Feng Duan, Lihui Zhang
更新时间: 2025-07-05
摘要: Chromium-containing wastewater from industrial sources, especially the highly toxic Cr(VI) pollution, has become a key focus of research in global environmental governance. In this study, conventional biochar (B), magnetic biochar (MB) and cetyltrimethyl ammonium bromide (CTAB) modified magnetic biochar (CTMB) were prepared by using Arundo donax as the precursor. The characteristics and adsorption performance of CTMB were systematically studied by characterization technology and batch adsorption experiments. Results show that the modification of magnetic biochar with CTAB not only improves the surface activity of the adsorbent, but also improves the adsorption performance, recycling performance and wide pH range adaptability of biochar by inhibiting iron agglomeration. The maximum adsorption capacity of the modified CTMB for Cr (VI) is 54.42 mg/g, which is significantly higher than that of the unmodified biochar B (25.10 mg/g) and common magnetic biochar MB (45.76 mg/g). The adsorption capacity of the adsorbent decreased by 10.35% after five cycles. It maintains a good removal efficiency of Cr (VI) in a wide pH range of 2-12, which greatly improves the adaptability and feasibility for practical applications. Electrostatic interactions, redox reactions, pore filling, and complexation play crucial roles in the adsorption mechanism of Cr(VI).

17. 题目: Synergistic Enhancement of Anaerobic Digestion and Resource Recovery via Extraction of Gelatinous Extracellular Polymeric Substances from Waste Activated Sludge: Performance and Underlying Mechanism
文章编号: N25070514
期刊: ACS Sustainable Chemistry & Engineering
作者: Yifeng Chen, Wenqiang Qi, Rongrong Mo, Qian Ping, Lin Wang, Yongmei Li
更新时间: 2025-07-05
摘要: This study systematically evaluated the effects of nongelatinous and gelatinous extracellular polymeric substances (ngEPS and gEPS) on the anaerobic digestion performance of waste activated sludge (WAS). Extraction of ngEPS and gEPS enhanced methane production by 10.6 and 51.6%, respectively. Additionally, the process enabled the recovery of high-value resources such as alginate-like exopolysaccharides (ALE, a key polysaccharide component of gEPS) at concentrations in the range of 14.0–57.20 mg·gVS_EPS^–1 and phosphorus (P) accounting for approximately 40.0–61.2% of the total P content in WAS. Mechanistic analyses revealed that hydrophobic EPS components hindered WAS hydrolysis, whereas EPS extraction improved fluidity, reduced viscoelasticity, and promoted mass transfer efficiency. Metagenomic results further demonstrated that EPS extraction alleviated hydrolysis limitations, enriched acidogenic bacteria, and restructured microbial communities toward enhanced carbon metabolism. These findings provide both theoretical insights and practical guidance for advancing anaerobic digestion efficiency and resource recovery from WAS. The study highlights the potential of EPS-targeted strategies to optimize WAS management practices, contributing to the development of more sustainable and circular resource recovery systems.

18. 题目: Oxygen-supplemented organic matter significantly enhanced microbial antimony mobility in hydrologically dynamic groundwater of a typical mining area
文章编号: N25070513
期刊: Water Research
作者: Weiqi Wang, Xuan Qiu, Min Li, Xinyue Zhang, Xiaoyan Liu, Yang Li, Jingwen Lei, Olli H Tuovinen, Hongmei Wang
更新时间: 2025-07-05
摘要: Microbial-mediated antimony (Sb) release from stibnite (Sb₂S₃) threatens groundwater safety, yet how hydrological fluctuations regulate this biogenic process and its mechanisms remain poorly understood. This study explored how hydrodynamic variations (simulating organic-oxygen recharge into anoxic aquifers) govern stibnite bio-weathering in Xikuangshan shallow groundwater through microcosms. The results revealed bacterial communities exhibit dual functionality under redox fluctuations: driving biofilm formation in anoxic phases and accelerating Sb release during oxic transitions. The AnH system (Anoxic-oxic-anoxic-oxic cycles with Na-lactate for Heterotrophs) demonstrated a maximum of Sb concentration at 0.63 mM after 16 days, primarily driven by Dechloromonas, Ferribacterium, and Thauera. Microbial metabolic byproduct nitrite activates oxygen to produce H₂O₂ (maximum of 14.7 μM), which also contributes to the release and oxidation of antimony. Moreover, carbon source affects the pathway of bacterial antimony release. Na-lactate stimulated the expression of aioA (Sb-oxidation) in heterotrophs, while inorganic carbon (Na-bicarbonate) favored soxB (sulfur-oxidation) in autotrophic Thiobacillus and mixotrophic sulfur-oxidizers. In summary, oxygen and carbon sources regulate biofilm formation, aioA and soxB expression, and H₂O₂ generation, subsequently affecting Sb release/oxidation. This study deciphered how oxygen-carbon regimes govern microbial Sb mobilization, elucidating antimony biogeochemical dynamics under hydrological fluctuations.

19. 题目: Distribution of antibiotics in water resources and the role of biochar in advanced water treatment techniques for antibiotics removal in the quest for cleaner water
文章编号: N25070512
期刊: Separation and Purification Technology
作者: Isha Medha, Subhash Chandra, Sahil Chauhan, Prakash Taksal, Chandra Sekhar Tiwari, Nabisab Mujawar Mubarak, Samatha Bevara, Adarsh Kumar
更新时间: 2025-07-05
摘要: Recent demand, climate change, and pollution have caused a global water deficit and water quality degradation. In recent years, antibiotics have evolved as one of the emerging contaminants contributing to antimicrobial resistance and water contamination. This research critically examines antibiotics’ origins, distribution, and transport into water resources and related antimicrobial health risks. This study also assessed the efficacy of conventional sewage treatment plants in removing antibiotics from wastewater and compared them to advanced treatment systems. Finally, the study thoroughly examined the efficacy of biochar and modified biochar in removing antibiotics from wastewater and their compatibility with contemporary advanced treatment systems. The study also reviewed the status of advanced treatment systems designed for emerging contaminants removal (in this case, antibiotics) concerning technology readiness level (TRL). It also evaluated the sustainability of such systems using the life cycle assessment analysis. The study finds that antibiotics find their way from various points and other non-point sources to water resources. Conventional sewage treatment plants lack efficiency in removing antibiotics, and to date, no significant evaluation has reviewed biochar’s compatibility with advanced treatment methods. The study indicated that integrating biochar or modified biochar with advanced treatment technologies such as adsorption, microbial fuel cells, photocatalysis, and hybrid treatment systems substantially improved the removal of antibiotics from wastewater. Among all technologies, the hybrid treatment system was more compatible and effective with biochar for efficiently removing antibiotics from the aqueous phase. The study suggested that more research is required to evaluate the efficacy of advanced treatment systems at a higher TRL level (7 – 9).

20. 题目: Molecular Fingerprints of Dissolved Organic Matter Leached from Microplastics over Prolonged Photochemical Aging: Implications for Aquatic Carbon Cycling
文章编号: N25070511
期刊: Water Research
作者: Zekun Zhang, Zhao Liang Chen, Yanjun Liu, Yuanbi Yi, Ruanhong Cai, Ming Ye, Mengyang Liu, Meng Yan, Kenneth M Y Leung, Ding He
更新时间: 2025-07-05
摘要: Microplastics are well-known emerging pollutants in aquatic environments, increasingly shown to release significant amounts of non-natural dissolved organic matter (DOM) into water systems. However, the molecular composition of DOM leached from different types of microplastics after long-term photochemical aging, and their impact on the aquatic carbon cycle, remain poorly understood. The potential presence and contribution of microplastic-derived DOM to the river-to-ocean continuum on a large scale have yet to be well-established. Using ultra-high-resolution Fourier-transform ion cyclotron resonance mass spectrometry, this study identified 155, 152, and 465 DOM molecules released from microplastics of polypropylene, polyethylene, and polystyrene, respectively, showing high potential for accumulation after 180 days of ultraviolet exposure. These molecules were subsequently detected in an extensive DOM dataset comprising 947 natural water samples, with an average detection frequency of 64.6%. Polystyrene-derived DOM molecules exhibit a strong resemblance to natural refractory DOM at the molecular level, suggesting its potential contribution to the long-term carbon pool. In contrast, polypropylene- and polyethylene-derived DOM molecules indicate more biologically labile structures that favor short-term carbon cycling. These findings emphasize the varying impacts of different microplastic types on carbon cycling, with polystyrene-derived DOM potentially contributing to refractory carbon pools and broader climate implications.