Journal of Hazardous Materials最新文献

{"title":"Highly-efficient H2S capture by deep eutectic solvents based on ionic liquid hybridized polyoxometalate: Insights into conformational transitions and structure-activity relationships","authors":"Baohua Wang, Rui Wang","doi":"10.1016/j.jhazmat.2025.139037","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.139037","url":null,"abstract":"While the combination of polyoxometalates (POM) with green solvents has attracted considerable interest, the application of desulfurization in non-aqueous solvents remains a challenge, and a systematic understanding of the reaction mechanism and the conformational contributions is still lacking. Herein, the long-chain ionic liquids hybrid polyoxometalates deep eutectic solvents (PCDES) system was designed and constructed by combining two materials possessing the background of ionic liquid (ILs), alkyl long-chain ionic liquids hybrid polyoxometalates (POM-ILs) and ILs-based deep eutectic solvents (DES), to realize the liquid-phase desulfurization application of POM-ILs hybrid materials. Guided by density functional theory (DFT) calculations and characterization analyses, the “cloverleaf” conformational transition theory was firstly proposed to explain the desulfurization mechanism of PCDES. The exposure of the desulfurization active site, the expansion of the hydrogen sulfide (H₂S) capturing range, and the charge chain transfer behavior are the critical success factors for the enhancement of the PCDES desulfurization performance. The optimal desulfurizer PCDES@3C₁₄-2Im can be maintained at 100% desulfurization efficiency for nearly 150<!-- --> <!-- -->min over a wide temperature range of 25-200<!-- --> ^oC. Furthermore, the complete regeneration of the desulfurizer can be realized by adding hydrogen peroxide (H₂O₂), and more than 98% desulfurization efficiency can still be maintained after multiple cycles. The final desulfurization product is sulphate, which satisfies the harmless treatment of H₂S under the framework of green engineering. This work facilitates the deep fusion applications of polyoxometalate chemistry with green solvents and opens a fresh perspective for the investigation of structure-performance relationships of polyoxometalate non-aqueous liquid-phase desulfurizers.<h3>Environmental Implication</h3>Considering the current urgent demand for environmental protection, the treatment of H₂S holds significant practical importance. The PCDES system proposed in this study achieves efficient H₂S capture and conversion in a wide temperature range through a unique “core-shell” to “cloverleaf” conformational transition. H₂S is converted into stable and environmentally friendly sulfate, realizing the green closed-loop treatment of H₂S. It reduces the use of chemical reagents, resource consumption and environmental burden. This proposal offers a new perspective on efficient air pollution control technology and is expected to overcome the technical bottlenecks of traditional wet oxidation desulfurization.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"26 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144370873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Engineered magnetic metal-organic frameworks for efficient and broad-spectrum adsorption of micro/nanoplastics in beverages","authors":"Jia Feng, Yongzhen Dong, Hui Li, Jia Tu, Yiping Chen","doi":"10.1016/j.jhazmat.2025.139040","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.139040","url":null,"abstract":"Micro/nanoplastics have raised significant concerns due to their intrinsic toxicity and synergistic effects with co-existing pollutants, posing substantial risks to environmental ecosystems and human health. Although metal-organic frameworks (MOFs) demonstrate promising potential as efficient adsorbents for microplastic removal, the structure-activity relationships governing their adsorption mechanisms remain poorly understood. In this study, engineered magnetic MOFs materials (Fe₃O₄@carboxymethyl-cellulose-MOFs) were designed and synthesized to adsorb micro/nanoplastics. The adsorption behavior of five Fe₃O₄@CMC-MOFs composites toward micro-/nanoplastics was systematically investigated, with particular emphasis on clarifying structure-property correlations. Furthermore, starting from the structural differences, the adsorption mechanism was systematically analyzed by physicochemical characterization, adsorption kinetics and isotherms, and density functional theory. Results showed that Fe₃O₄@carboxymethyl-cellulose@MIL-101-NH₂ demonstrated superior adsorption performance for polystyrene (PS) mainly through van der Waals interactions. Under optimal conditions, Fe₃O₄@carboxymethyl-cellulose@MIL-101-NH₂ enabled adsorbing 98.0% and 245.1<!-- --> <!-- -->mg/g PS, the maximum adsorption amount was 1923 mg/g based on Langmuir isotherm model. And it remained &gt;89.0% efficiency after five cycles. As well as it showed satisfactory adsorption performance for other types of microplastics such as (polypropylene and polyethylene) with different shapes, micro/nano-size, and chargeability (&gt;250<!-- --> <!-- -->mg/g). Moreover, Fe₃O₄@carboxymethyl-cellulose@MIL-101-NH₂ can effectively remove &gt;81.0% micro/nanoplastics in beverages. The developed engineered magnetic MOFs material has excellent adsorption performance, efficiency and cost-effectiveness, possessing great potential for the removal of micro/nanoplastics in environment and food systems.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"45 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144341324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Translational In Vitro to In Vivo Study on Chronic Arsenic Exposure Induced Pulmonary Ferroptosis and Multi-Omics Analysis of Gut-Lung Axis Correlation","authors":"Sanaullah Sajid, Xu Chen, Yanqin Sun, Junjie Luo, Zhang Bin, Chen Linkang, Jieliang Huang, Chengze Lai, Yongchun Chen, Guo Lianxian","doi":"10.1016/j.jhazmat.2025.139049","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.139049","url":null,"abstract":"<h3>Background</h3>Chronic arsenic exposure is a global health concern linked to pulmonary diseases like fibrosis. However, its precise molecular mechanisms remain unclear. This study explored the effects of chronic arsenic exposure on a murine model (via diet) and BEAS-2B cells, focusing on oxidative stress, lipid peroxidation, mitochondrial dysfunction, and ferroptosis-mediated cell death.<h3>Methods</h3>BEAS-2B cells were exposed to 1 μmol/L NaAsO₂ for 30 passages. Oxidative stress was assessed via ROS quantification, GSH depletion, and T-SOD activity. Lipid peroxidation was measured using BODIPY fluorescence and MDA levels. Mitochondrial dysfunction was determined by mtROS imaging and JC-1 staining. Ferroptosis was analyzed through GPX4 expression and TEM-based mitochondrial integrity. A 14-month murine model evaluated histopathology, metabolomic dysregulation, and gut-lung axis crosstalk.<h3>Results</h3>Arsenic exposure significantly increased ROS, depleted GSH, and reduced T-SOD activity. Lipid peroxidation and mitochondrial dysfunction were evident, with a ~60% decline in GPX4. Murine lung histology showed alveolar thickening, inflammatory infiltration, and elevated IL-6, TNF-α, and VEGF. Metabolomic analysis revealed disrupted lipid metabolism, correlating with ferroptosis markers.<h3>Conclusions</h3>This was the first study to demonstrate ferroptosis as a key mechanism in arsenic-induced lung epithelial damage using a 14-month murine model and a 30-passage cellular model. We further demonstrated that ferroptosis induced by chronic exposure becomes functionally irreversible, as ferroptosis inhibition by Ferrostatin-1 failed to rescue GPX4 expression, unlike prior acute exposure models.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"8 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144370872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the Impact of Microplastic Characteristics on Ecological Function, Microbial Community Migration and Reconstruction Mechanisms during Saline-Alkali Soil Remediation","authors":"Yifei Li, Wei Ling, Jian Yang, Yi Xing, Qi Zhang, Lihui Feng, Jiachen Hou, Chang Hou, Qingbin Lu, Tianqi Wu, Ziyuan Gao, Yifei Li","doi":"10.1016/j.jhazmat.2025.139044","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.139044","url":null,"abstract":"Saline-alkali soils constrain agricultural production due to high salt-alkali stress, and the microplastics introduced during agricultural improvement processes, such as through agricultural film residue and irrigation inputs, may have complex effects on soil ecological functions. As a new type of pollutant, microplastics are widely distributed in soils, water, and the atmosphere. However, the interactions between microplastics in the saline-alkali soil remediation process and the environment remain unclear. This study systematically analyzed the ecological effects of PE, PP, and PBAT microplastics during the remediation of saline-alkali soils with biogas slurry through laboratory simulation experiments. The results showed that microplastics significantly affect carbon-nitrogen cycle-related indicators (such as ammonia nitrogen and DOC) by altering the pH, electrical conductivity, and organic matter decomposition process of saline-alkali soils, and strongly correlate with the microbial community composition and functional pathways. Microplastics triggered the activation of redox enzyme activity and the co-expression of heavy metal resistance/carbon-nitrogen cycle genes, driving the adaptive reconstruction of microbial communities. Conventional microplastics (PE/PP) exhibited slow surface oxidation in saline-alkali soils, with physical adsorption dominating their ecological effects. They inhibited microbial diffusion, induced ecological niche competition, and selectively enriched hydrocarbon-degrading bacteria <em>Alcanivorax</em> and salt-alkali-resistant actinobacteria <em>Nitriliruptoraceae</em>. Their community assembly was mainly driven by random processes, and high microplastic abundance (10<!-- --> <!-- -->wt%) showed a threshold effect on bacterial composition compared to control samples. In contrast, as the particle size decreased, the degradable PBAT accelerated degradation due to ester bond hydrolysis (C=O functional group decreased from 52.50% to 34.92%), releasing decomposition products that drove deterministic community assembly and reconstructed microbial communities (enriching <em>Proteobacteria</em>, <em>Firmicutes</em>, and <em>Halomonas</em>). The rapid degradation of PBAT may exacerbate short-term ecological disturbances, while the chemical inertness of PE/PP poses a long-term retention risk. This study provides key data for risk management of microplastics in saline-alkali soil remediation. Although microplastic pollution may accelerate soil remediation by promoting microbial metabolic activity, further microplastic safety risk assessment during saline-alkali soil remediation is still needed.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"39 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144341321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cu-Accelerated Structural Reconstruction to Form CoMoO4/Co(OH)2/Cu Tri-Component for Efficient Synergistic Catalytic Ammonia Synthesis","authors":"Longbing Zuo, Fangchao Lou, Shiyi Liu, Shuo Geng","doi":"10.1016/j.jhazmat.2025.139038","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.139038","url":null,"abstract":"Electrochemical nitrate reduction reaction (e-NO₃⁻RR) offers a dual solution for wastewater remediation and sustainable ammonia synthesis, yet its practical application is constrained by sluggish multi-proton/electron transfer kinetics. Herein, we engineer a self-reconfiguring heterometallic catalyst through in situ transformation of Cu-anchored CoMoO₄ nanosheets on nickel foam (CoMoO₄-Cu_1.5/NF). Under operational conditions, dynamic reconstruction generates a ternary CoMoO₄/Co(OH)₂/Cu heterostructure, achieving breakthrough e-NO₃⁻RR performance with an ammonia yield of 20.1<!-- --> <!-- -->mg<!-- --> <!-- -->h⁻¹ cm⁻² and 98.5% Faradaic efficiency at -0.2<!-- --> <!-- -->V <em>vs</em>. RHE–surpassing all previously reported CoMoO₄-based catalysts. Through <em>in-situ</em> spectroscopy and density functional theory (DFT) calculations, the synergistic interactions among the components are elucidated: (1) Co(OH)₂ modulates intermediate adsorption and triggers water dissociation to supply reactive hydrogen (*H), (2) Cu nanoclusters selectively accelerate NO₃⁻-to-NO₂⁻ conversion while suppressing H₂ evolution through *H dimerization inhibition, and (3) CoMoO₄ drives NO₂⁻-to-NH₃ transformation. Further integration with glycerol oxidation reaction (GOR) establishes an energy-efficient bifunctional system that enhances overall catalytic efficiency compared to conventional oxygen evolution coupling. This work pioneers a heterometallic engineering strategy for designing adaptive electrocatalysts, advancing dual-functional electrocatalysis toward sustainable nitrogen and biomass valorization.<h3>Environmental Implication</h3>Nitrate pollution poses a significant environmental challenge globally. High nitrate levels can cause eutrophication in water bodies, threatening ecosystems and human health. Traditional ammonia synthesis methods are energy-intensive and produce substantial carbon emissions, conflicting with sustainable development goals. Electrocatalytic nitrate reduction (e-NO₃⁻RR) technology presents an innovative solution to these issues. In this study, we developed a self-reconstructing heterometallic catalyst by anchoring Cu onto CoMoO₄ nanosheets, creating a ternary CoMoO₄/Co(OH)₂/Cu heterostructure. This catalyst exhibits outstanding performance in e-NO₃⁻RR, outperforming previous CoMoO₄-based catalysts. This catalyst not only shows promise for mitigating nitrate pollution but also has the potential to enhance green ammonia synthesis and promote sustainable nitrogen cycling, significantly impacting environmental protection and energy sustainability.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"27 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144370990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cr(VI)-bioremediation mechanism of a novel strain Bacillus sp. Cr02 with simultaneous aerobic/anaerobic reduction for Cr(VI) from soil to groundwater","authors":"Liping Liu, Rui Liu, Fang Wang, Yujun Wu, Fei Ge, Jiang Tian, Feng Li, Shengguo Xue","doi":"10.1016/j.jhazmat.2025.139034","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.139034","url":null,"abstract":"Microbial remediation strategies have been developed to alleviate chromium (Cr) contamination in soil and groundwater. However, the complex redox conditions resulting from variations in oxygen content at different depths of the soil-groundwater system limit the ability of most microorganisms to achieve aerobic/anaerobic sustained bioreduction of Cr(VI) from topsoil to groundwater in contaminated industrial sites. This work screened a novel strain, <ce:italic>Bacillus megaterium</ce:italic> Cr02, investigated its unique Cr(VI) reduction mechanisms under aerobic and anaerobic conditions, and evaluated its performance in practical soil-groundwater remediation. The results showed that strain Cr02 could rapidly reduce Cr(VI) at an initial concentration of 100<ce:hsp sp=\"0.25\"></ce:hsp>mg/L in groundwater under both conditions. The ChrR enzyme was identified as a key player in aerobic Cr(VI) reduction, with molecular docking showing its hydrophobic interaction with Cr(VI). Conversely, the extracellular reducing metabolite cysteine became the major contributor to anaerobic Cr(VI) reduction. Moreover, their reduction products were further demonstrated to comprise soluble Cr(III) and Cr(OH)<ce:inf loc=\"post\">3</ce:inf> precipitates. In soil redox alternations, strain Cr02 stably converted &gt;90% of Cr(VI) to residual chromium. These findings highlight the strain's ability to synergistically remediate soil and groundwater, positioning it as a promising candidate for the bioremediation of Cr pollution in dynamic oxygen-containing environments.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"45 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144341169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantitative prediction and mechanistic insights into Cu(II) transport in kaolinite-coated sand columns affected by ferrihydrite nanoparticles","authors":"Lijuan Zeng, Guining Lu, Feng Jiang, Ying-Jie Zhang, Xiaohu Jin, Weilin Huang, Yu-Jung Lin, Jyh-Fu Lee, Xiaoyun Yi, Zhi Dang","doi":"10.1016/j.jhazmat.2025.139036","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.139036","url":null,"abstract":"Colloidal particles play a significant role in the transport of heavy metals in soil, but quantitative prediction of the impact of colloids on their migration and bioavailability remains challenging. This study examines the impact of ferrihydrite nanoparticles (Fh-NPs) in influencing the transport and spatial distribution of Cu(II) within a kaolinite-coated sand column. When Fh-NPs are pre-adsorbed on kaolinite or co-migrate with Cu(II), they hinder the migration of Cu(II) in kaolinite-coated sand columns. The observed retardation factor of Cu(II) with Fh-NPs was 1.19-1.52 times higher than in their absence, indicating a notable increase in Cu(II) retention. Calculations of Cu(II) retention (0.0042–0.0166<!-- --> <!-- -->mg<!-- --> <!-- -->g⁻¹ at pH 3.0-5.5) closely matched experimental values (0.0044–0.0170<!-- --> <!-- -->mg<!-- --> <!-- -->g⁻¹), underscoring the reliability of the theoretical model. Our study also showed that the adsorption mechanism of Cu(II) on both kaolinite and Fh-NPs surfaces involved the formation of bidentate binuclear inner-sphere complexes. The shorter Cu–Fe interatomic distance, compared to Cu–Al/Si, accounted for the enhanced bonding stability of Cu(II) with Fh-NPs. This study quantitatively examined colloidal-mediated Cu(II) transport in saturated porous media, elucidating its underlying mechanisms through molecular interactions. The findings provided critical insights for enhancing contaminants transport modeling, improving risk assessment, and developing targeted remediation strategies.<h3>Environmental Implication</h3>Abundant colloidal particles in natural soils significantly impact heavy metal migration. Quantitatively predicting colloid effects on heavy metal migration and bioavailability is crucial for environmental pollution management. This study quantitatively assessed the impact of ferrihydrite nanoparticles (Fh-NPs) on Cu(II) transport and morphological distribution in kaolinite-sand columns. A method was proposed to quantitative predicted the influence of Fh-NPs on the transport of Cu(II) in kaolinite porous media. Elucidating their interaction mechanisms based on molecular-scale as well as colloidal chemical interface reactions. Results supported optimizing transport models, improving risk assessment, and guiding remediation strategies.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"120 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144370938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of Microplastics on Antibiotic Resistance Genes Across Diverse Environments: A Comprehensive Meta and Machine-learning Analysis","authors":"Ziyue Yu, Yang Yu, Qiu ying An, Li Zhou, Bing Yan","doi":"10.1016/j.jhazmat.2025.139042","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.139042","url":null,"abstract":"The coexistence of microplastics (MPs) and antibiotic resistance genes (ARGs) in various environments presents significant ecological risks. However, the influence of MPs properties and environmental conditions shaping ARG dynamics remain unclear. This study utilized meta- and interaction analysis to elucidate how MPs properties (size, concentration, type, and age) and exposure environments drive ARGs fluctuations. Key findings indicate that MPs significantly influenced ARGs abundance in intestinal, sludge, and plant environments, no pronounced effects were observed in soil or water and sediments. Among the MPs properties, size and concentration were the most influential factors, with their impacts varying considerably across environments. In intestinal settings, exposure time and MPs concentration drove ARG proliferation; while the concentration-size interactions of MPs shaped ARGs in sludge environments; MPs size was the primary influencing factor in plant environments, reflecting unique ARG dynamics in these contexts. The study also highlighted significant pairwise interactions, such as MPs concentration and size, underscoring the combined effects of these factors on ARG abundance. Despite these contributions, the study acknowledges limitations, including the limited analysis of aerosolized ARGs and more diverse MPs characteristics. These findings provide valuable insights into the ecological risks of MPs and ARGs and emphasize the importance of tailored mitigation strategies across different environments.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"26 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144341358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Irradiation-Dependent Properties, Photodegradation Dynamics, and Molecular Evolution Mechanism of Biochar-Derived Dissolved Black Carbon","authors":"Tingting Li, Fanhao Song, Mingqi Ruan, Yuhan Cao, Yao Zhao, Weiying Feng, Nuo Chen, Jin Hur, Fazhi Xie, Fengchang Wu","doi":"10.1016/j.jhazmat.2025.139041","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.139041","url":null,"abstract":"Photochemistry controls the fate of dissolved black carbon (DBC) in aquatic environments, often leading to negative environmental impacts. However, the dynamic changes in DBC components during photodegradation reactions remain largely unexplored. Herein, we propose a novel photodegradation mechanism for DBC components by evaluating their irradiation-dependent properties, photodegradation dynamics, and molecular evolution using high resolution mass spectrometry and spectroscopy combined with two-dimensional correlation, inter sample ranking, and molecular networking analyses. Lignin-like and condensed aromatic molecules were predominant groups in DBC. As irradiation time increased, the functional groups in DBC displayed a sequential response of O-H stretching of phenolic &gt; C-O stretching of alcohols/ethers/carbohydrates &gt; C-H stretching of alkenes/(-COO stretching of carboxylic acids &gt; C=O of amide in proteins). DBC molecules transformed from unsaturated and oxidized molecules to saturated and reduced molecules during irradiation, as revealed by the chemical transformation networks of unique molecules. Components with fulvic-like fluorescence, along with lignin-like and condensed aromatic molecules, were identified as photo-labile fractions during photodegradation, while saturated molecules could play an important role in the photodegradation reaction (e.g., bond cleavage and photooxidation) of photo-stable fractions. These findings enhance our understanding of the environmental behaviors of DBC in ecosystems.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"247 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144370991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanistic Insights into Redox-Driven Formation, transformation and Stability of Fe-HA-Cd Nanocolloids at Particle–Water Interfaces","authors":"Ruyi Zheng, Ruihan Zhao, Tianwen Yang, Pan Wu, Jian Zhu, Peng Liao","doi":"10.1016/j.jhazmat.2025.139033","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.139033","url":null,"abstract":"Natural organic matter (NOM) colloids are frequently encountered at the anoxic-oxic interface in subsurface environments. Their surface-rich functional groups and redox capacity exert a significant influence on the fate and transport of Fe and Cd in aquatic systems. The present study demonstrated that stable Fe-HA-Cd colloids formed in both anoxic and oxic environments, with hydrodynamic diameters stabilized at 97.4-134.5<ce:hsp sp=\"0.25\"></ce:hsp>nm at an HA concentration of 64.3<ce:hsp sp=\"0.25\"></ce:hsp>mg<ce:hsp sp=\"0.25\"></ce:hsp>C/L. The incorporation of Fe promoted the formation of Cd colloids on the surface of HA to a certain extent. However, the high concentration of Fe(II) (C/Fe &lt;22.4)and Fe(III) (C/Fe&lt;7.0) in both anoxic and oxic conditions inhibited the formation of Cd colloid by competitive adsorption and co-precipitation, respectively. Furthermore, the redox effect in the oxic transformation of Fe(II)-HA<ce:inf loc=\"post\">red</ce:inf>-Cd(II) colloid led to the release of truly dissolved Cd from colloidal particles to the water. The aggregation kinetics and Derjaguin-Landau-Verwey-Overbeek (DLVO) theory demonstrated that Fe-HA-Cd colloids reduced particle stability compared to HA-Cd(II) colloids. Additionally, the depolymerization behavior of Fe-HA-Cd colloids during aggregation exhibited variability under different conditions, particularly with regard to the time-dependent size effect. This study offers detailed data on the formation, oxidative transformations, and stability of Fe-HA-Cd colloids in anoxic-oxic environments rich in organic matter. The findings provide valuable insights into Cd partitioning and environmental behavior between particulate and dissolved states, essential for understanding Cd pollution and advancing effective remediation strategies.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"101 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144341170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}