Environmental Research最新文献

{"title":"Concentrations and formation pathways of nitrogen-containing organic compounds in PM2.5 from Seoul and Beijing","authors":"Ju Young Kim ,&nbsp;Yong Pyo Kim ,&nbsp;Xu Yu ,&nbsp;Jianzhen Yu ,&nbsp;Zhijun Wu ,&nbsp;Hyung-Min Lee ,&nbsp;Mijung Song ,&nbsp;Kyoung Soon Jang ,&nbsp;Changhyuk Kim ,&nbsp;Na Rae Choi ,&nbsp;Ji Yi Lee","doi":"10.1016/j.envres.2025.122959","DOIUrl":"10.1016/j.envres.2025.122959","url":null,"abstract":"<div><div>Organic nitrogen is an important constituent of organic aerosols, yet our understanding of the specific compounds, their concentrations, and atmospheric distribution remains limited. In this study, three nitrosamines (N-Nitrosodimethylamine, N-Nitrosodietylamine, and N-Nitrosodibutylamine) and three amides (N,N-Dimethylformamide, N-Hexadecanamide, and N-Octadecanamide) in atmospheric particulate matter with an aerodynamic diameter of equal to or less than 2.5 μm (PM_2.5), collected in Seoul, South Korea, and Beijing, China, during winter in 2020 and summer in 2021, were analyzed to characterize their concentrations and major contributors. Nitrosamines and amides were found to have distinct distributions under different atmospheric conditions and aerosol properties. Total nitrosamine concentrations were higher in Seoul (5.11 ± 10.13 ng/m³ (winter); 4.15 ± 3.91 ng/m³ (summer)) than in Beijing (0.75 ± 1.59 ng/m³ (winter); 1.09 ± 1.50 ng/m³ (summer)). Total amide concentration was slightly higher in Beijing (2.73 ± 1.84 ng/m³) than in Seoul (2.54 ± 2.84 ng/m³) during winter, while in summer, the concentration in Beijing (0.65 ± 0.49 ng/m³) was much lower than in Seoul (1.82 ± 0.90 ng/m³). Seoul appeared to show higher relative humidity (RH) and aerosol liquid water content concentration compared to Beijing, which may have contributed to elevated nitrosamine concentrations, potentially through enhanced aqueous-phase nitrosation reactions. Meanwhile, amides seemed to demonstrate increased uptake into PM_2.5 and possibly participated in accretion reactions yielding particulate products, particularly under the lower RH conditions observed in Beijing. These findings suggest that atmospheric conditions, such as RH, may influence the distribution patterns of nitrogen-containing organic compounds in the atmosphere.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"286 ","pages":"Article 122959"},"PeriodicalIF":7.7,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145184386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Estrogen-containing contraceptive use and blood lead concentrations in a cohort of premenopausal individuals.","authors":"Lauren E Chapman, Mandy S Hall, Arianna Foster, Donna D Baird, Quaker E Harmon, Robert O Wright, Julio A Landero, Renee Heffron, Lauren A Wise, Ganesa Wegienka, Ruth J Geller, Amelia K Wesselink, Samantha Schildroth, Janet E Hall, Erik J Tokar, Kristen Upson","doi":"10.1016/j.envres.2025.122935","DOIUrl":"10.1016/j.envres.2025.122935","url":null,"abstract":"<p><p>After exposure, toxic metal lead is stored in the skeleton and is mobilized to systemic circulation with bone turnover. Given the bone-conserving properties of estrogen, we investigated whether current use of estrogen-containing contraception is associated with lower blood lead concentrations. We conducted a cross-sectional analysis using enrollment data from the Study of Environment, Lifestyle & Fibroids (SELF), a cohort of 1693 Black women ages 23-35 years enrolled in years 2010-2012. The study population was restricted to non-users of injectable hormonal contraception with questionnaire data on hormonal contraceptive use and laboratory data on whole blood lead concentrations (n = 1549). The geometric mean blood lead concentrations for current users of estrogen-containing contraception and non-users were 0.41 μg/dl (95 % CI: 0.39-0.43) and 0.51 μg/dl (95 % CI: 0.50-0.52), respectively. After adjusting for age, education, current smoking status, alcohol consumption, recency of injectable contraceptive hormone use, and recent birth using a multivariable linear regression model to estimate the percent difference in blood lead concentrations, current use of estrogen-containing contraception was associated with an 11 % lower blood-lead concentrations (95 % CI: -16 %, -5 %). In exploratory analyses considering contraceptive type, current combined oral contraceptive users (n = 187) had 10 % lower blood lead concentrations (95 % CI: -16 %, -4 %) and contraceptive vaginal ring/transdermal patch users (n = 33) had 18 % lower blood lead concentrations (95 % CI: -29 %, -5 %) compared with non-users. Given the known toxic effects of lead and the common use of estrogen-containing contraception, further research is warranted to confirm our observation of lower blood lead concentrations with current use of estrogen-containing contraception.</p>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":" ","pages":"122935"},"PeriodicalIF":7.7,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145181756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Bacterial network complexity drives carbon, nitrogen and phosphorus metabolism potential under short-term soil water content changes in wetlands","authors":"Shouyang Luo ,&nbsp;Jiabao Yuan ,&nbsp;Yanyu Song ,&nbsp;Jia Qi ,&nbsp;Mengyuan Zhu ,&nbsp;Huanhuan Feng ,&nbsp;Yiting Zhao ,&nbsp;Wenkai Mei ,&nbsp;Fangcong Fu ,&nbsp;Xiaoyu Li ,&nbsp;Changchun Song","doi":"10.1016/j.envres.2025.122952","DOIUrl":"10.1016/j.envres.2025.122952","url":null,"abstract":"<div><div>Wetland soil microbial communities play pivotal roles in biogeochemical cycling; however, how their network complexity mediates carbon (C), nitrogen (N), and phosphorus (P) metabolism in response to soil water content (SWC) changes remains unclear. In this study, soil samples from the Zhalong, Momoge and Xianghai wetlands in Songnen Plain of China were incubated under natural (CK), drought (10 % SWC), and high SWC (50 % SWC) conditions, followed by metagenomic sequencing to evaluate the impact of SWC changes on bacterial community structure and function. The results showed that soil bacterial diversity and network complexity decreased under drought but recovered under high SWC, with Proteobacteria and Actinobacteria displaying divergent responses. C fixation pathways (rTCA and DC-HB cycles) were significantly enriched under 50 % SWC, which correlated strongly with enhanced bacterial interactions. The abundance of denitrification genes (<em>norBC</em>, <em>nosZ</em>) decreased under drought but increased under high SWC. P metabolism (purine metabolism and two-component systems) showed strong SWC dependence, with key genes (<em>PstS</em>, <em>phnDC</em>) increased in abundance under 50 % SWC. Notably, bacterial network complexity tightly coupled with metabolic pathways, indicating SWC driven community restructuring regulates wetland soil C, N and P cycling. These findings underscore the critical importance of hydrological management in maintaining bacterial-mediated nutrient cycling functions of wetland ecosystem under climate change.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"286 ","pages":"Article 122952"},"PeriodicalIF":7.7,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145181730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Associations between residential greenness exposure during pregnancy and bone mineral density in early childhood","authors":"Yibing Zhu ,&nbsp;Linxi Tang ,&nbsp;Yudiyang Ma ,&nbsp;Bin Sun ,&nbsp;Haibo Li ,&nbsp;Feipeng Cui ,&nbsp;Jingmin Guo ,&nbsp;Yaohua Tian ,&nbsp;Chong Miao","doi":"10.1016/j.envres.2025.122948","DOIUrl":"10.1016/j.envres.2025.122948","url":null,"abstract":"<div><h3>Background</h3><div>The impact of <strong>residential greenness exposure during pregnancy</strong> on early childhood bone mineral density (BMD) remains poorly understood. This study aimed to examine the association between residential greenness exposure during pregnancy and BMD in early childhood (0–3 years).</div></div><div><h3>Methods</h3><div>Data on participants, including demographics, health status, exposures, and outcomes, were derived from the pediatric subcohort within the Fujian Birth Cohort Study, recruited from 2019 to 2021. G<strong>reenness exposure</strong> was quantified using the Normalized Difference Vegetation Index within 500-m buffer range. BMD was measured via quantitative ultrasonography (QUS), with low BMD defined as z-score below −1. To assess the associations of NDVI_500m with BMD and low BMD, linear regression and logistic regression models were applied.</div></div><div><h3>Results</h3><div>The median maternal age was 30.50 years (IQR = 5.00). We found that higher NDVI_500m exposure was consistently linked to higher BMD z-scores. An IQR increase in NDVI_500m during the entire pregnancy resulted in a 0.04 (95 % CI: 0.01, 0.06) increase in BMD z-scores. For the first, second, and third trimesters, each IQR increase in NDVI_500m exposure led to a 0.03 (95 % CI: 0.00, 0.06), 0.04 (95 % CI: 0.00, 0.07), and 0.04 (95 % CI: 0.01, 0.07) increase in BMD z-scores, respectively. However, no significant relationship was observed between NDVI_500m and low BMD risk.</div></div><div><h3>Conclusions</h3><div>This study revealed a positive association of residential greenness exposure across the entire pregnancy and all trimesters with BMD in early childhood. These findings underscore the potential benefits of enhancing maternal access to greenness during pregnancy for improving offspring bone health.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"286 ","pages":"Article 122948"},"PeriodicalIF":7.7,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145181765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Associations between PM2.5 components, temperature, and semen quality: Insights from seminal plasma metabolome","authors":"Jun-feng Tan ,&nbsp;Li-li Huang ,&nbsp;Zhong-Hua Lu ,&nbsp;Hang-Yu Xiang ,&nbsp;Hong Yang ,&nbsp;Hai-Xia Zhou ,&nbsp;Tian-qing Meng ,&nbsp;Cheng-liang Xiong ,&nbsp;Yi-Xin Wang ,&nbsp;Jie Zhang","doi":"10.1016/j.envres.2025.122947","DOIUrl":"10.1016/j.envres.2025.122947","url":null,"abstract":"<div><div>Declining semen quality has become a global concern, with environmental exposures implicated as key contributors. In this prospective cohort study of 649 men in Wuhan, China, we investigated associations between fine particulate matter (PM_2.5) components, ambient temperature, and semen quality, and explored underlying mechanisms using untargeted seminal plasma metabolomics. Bayesian Kernel Machine Regression and generalized linear models revealed that higher exposures to nitrate (NO₃⁻), sulfate (SO₄²⁻), and temperature were independently associated with reduced sperm concentration. Specifically, a 2.72-fold increase in NO₃⁻, SO₄²⁻, and temperature corresponded to decreases of 19.41 × 10⁶/mL, 47.89 × 10⁶/mL, and 36.05 × 10⁶/mL in sperm concentration, respectively. Metabolomic profiling identified distinct metabolic signatures associated with each exposure: SO₄²⁻ and temperature predominantly disrupted lipid metabolism, while NO₃⁻ exposure primarily disrupted nucleotide metabolism. Notably, three metabolites—3-hydroxybutyrylcarnitine, eicosapentaenoic acid, and uridine—were consistently linked to all exposures, indicating shared pathways involving mitochondrial dysfunction, membrane instability, and oxidative stress. These findings provide molecular evidence that co-occurring environmental stressors can impair male reproductive health via convergent metabolic mechanisms, highlighting the importance of addressing both individual and combined exposure risks.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"286 ","pages":"Article 122947"},"PeriodicalIF":7.7,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145172169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Benthic biofilms as reservoirs of recalcitrant organic matter in freshwater reservoirs: insights from FT-ICR MS","authors":"Ch. Tahir Mehmood ,&nbsp;Yujian Dong ,&nbsp;Huiyu Liu ,&nbsp;Han Yu ,&nbsp;Yan Wang ,&nbsp;Yiwei Li ,&nbsp;Yeyuan Xiao ,&nbsp;Olivier Habimana","doi":"10.1016/j.envres.2025.122945","DOIUrl":"10.1016/j.envres.2025.122945","url":null,"abstract":"<div><div>Benthic biofilms play a significant role in influencing the composition and cycling of dissolved organic matter (DOM) in freshwater reservoirs. In this study, we characterized the molecular composition of DOM using direct injection Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (DI-FT-ICR MS), with complementary insights provided by three-dimensional Excitation-Emission Matrix (3D EEM) fluorescence spectroscopy, comparing samples from bulk water and biofilms across three reservoirs. Biofilm-associated DOM exhibited higher SUVA-254 and Aromaticity Index (AI-mod) values, indicating an enrichment of recalcitrant and humic substances. 3D EEM analysis showed a 35 % increase in humic-like substances within biofilms compared to bulk water, underscoring their role in stabilizing organic compounds. FT-ICR MS analyses demonstrated that classes of aromatic compounds, including condensed aromatics, exhibited a markedly higher prevalence within biofilms (25.9 %) in comparison to bulk water (18.5 %). Biofilms also encompassed a greater quantity of nitrogenous compounds, with CHON categories constituting 17.3 % of dissolved organic matter (DOM) in biofilms in contrast to 9.2 % in bulk aquatic environments, underscoring their significance in nutrient cycling. Conversely, sulfur-containing compounds (CHOS) were less abundant in benthic biofilm samples (6.4 %) than in corresponding bulk water (12.1 %), a difference potentially attributable to various processes including differential production, consumption, or diffusion. Furthermore, biofilms displayed a higher average molecular weight (476.3 m/z) and elevated Double Bond Equivalence (DBE) (14.45) compared to bulk water (454.1 m/z; 12.99), highlighting the greater complexity of biofilm-associated DOM. Significant alterations in the composition of microbial communities observed between bulk water and biofilms provide additional evidence of the functional role that biofilms play in the alterations of dissolved organic matter (DOM). These results emphasize the significance of benthic biofilms in stabilizing organic substances, which has a substantial effect on the well-being and administration of freshwater ecosystems.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"286 ","pages":"Article 122945"},"PeriodicalIF":7.7,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145181701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Spatial distribution, temporal trends, and environmental fate of legacy contaminants in the cryosphere of Spitsbergen, Svalbard Islands","authors":"Tanita Pescatore ,&nbsp;Francesca Spataro ,&nbsp;Jasmin Rauseo ,&nbsp;Federico Scoto ,&nbsp;Andrea Spolaor ,&nbsp;Stefano Crocchianti ,&nbsp;David Cappelletti ,&nbsp;Luisa Patrolecco","doi":"10.1016/j.envres.2025.122943","DOIUrl":"10.1016/j.envres.2025.122943","url":null,"abstract":"<div><div>The Arctic cryosphere, particularly the glaciers of the Svalbard Archipelago, serves as both a repository and an indicator of persistent organic pollutants (POPs) contamination transported via long-range atmospheric pathways. This study provides a comprehensive analysis of polychlorinated biphenyls (PCBs), legacy pesticides (LPs), and current-use pesticides (CUPs) in seasonal snow and shallow ice cores. Samples were collected from three Spitsbergen glaciers (Austre Brøggerbreen, Midtre Lovénbreen, and Kongsvegen) during two consecutive spring campaigns (2022–2023). PCBs dominated the contaminant profile, with the highest contributions found in surface snow. Low-chlorinated congeners, such as PCB8 and PCB52, were the most prevalent, reflecting cold-climate transport and deposition dynamics. LPs exhibited greater variability, showing higher concentrations in ice cores (mean 92.2 ± 50.9 pg/L), suggesting persistence and preferential retention during snow metamorphism and meltwater infiltration. In contrast, CUPs were more abundant in snow (mean 120 ± 73.6 pg/L), highlighting their potential for seasonal leaching. While total contaminant concentrations revealed no significant interannual differences, spatial variability highlighted the influence of glacier topography and exposure to atmospheric sources. Finally, we combined surface mass balance data with our analytical results to provide an estimate of the annual contaminant release of PCBs, LPs, and CUPs from snow and ice melt at the investigated glacial sites. Despite limited spatial representation, our findings reveal how climate change and deglaciation could remobilize these legacy contaminants, posing under-investigated risks to the Arctic ecosystem. These findings emphasize the urgent need for more targeted sampling and monitoring for a deeper understanding of persistent pollution in polar regions.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"286 ","pages":"Article 122943"},"PeriodicalIF":7.7,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145172141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Mechanisms of polyethylene microplastics on microbial community assembly and carbon-nitrogen transformation potentials in soils with different textures","authors":"Zijie Yu ,&nbsp;Jin Wang ,&nbsp;Shu Wang ,&nbsp;Yifan Jiang ,&nbsp;Jingya Liu ,&nbsp;Zhixiang She ,&nbsp;Zhengbo Yue","doi":"10.1016/j.envres.2025.122942","DOIUrl":"10.1016/j.envres.2025.122942","url":null,"abstract":"<div><div>Pollution caused by microplastics (MPs) is progressively altering soil health worldwide, with far-reaching consequences that may adversely affect ecosystems and public well-being. Using high-throughput sequencing of 16S rRNA, this research explores the impact of polyethylene (PE) MPs on the diversity and function of soil microbial communities, focusing on how these particles affect the movement of carbon and nitrogen across soils with different textures. The research analyzed soil samples of three different textures from 14 different regions. Results show that PE MPs reduced microbial richness in sand and clay soils by 17.33 % and 15.24 %, respectively, but increased richness in loam soils by 62.34 % (<em>P</em> &lt; 0.01), mainly promoting the proliferation of bacteria such as <em>Sphingomonas</em>. Clay-plastic-associated soils exhibited 69,789 microbial network edges, significantly higher than sand (28,286) and loam (37,044), indicating enhanced functional connectivity, with more functionally important microorganisms present. Further analysis shows that the carbon sequestration capacity and nitrogen-transforming activity of plastic-associated soils increased with decreasing soil particle size. The structure and ecological balance of microbial populations linked to plastics in clay soils were predominantly governed by the organic matter present in the soil and the proportion of the C/N ratio. These results provide new insights into the effects of MPs on soil ecosystems and theoretical support for MPs pollution management and ecological restoration.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"286 ","pages":"Article 122942"},"PeriodicalIF":7.7,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Ultrasound treatment of digested sludge: process parameters interaction and comparative assessment of batch and flow-through configurations","authors":"Enrica Ciotola,&nbsp;Alessandra Cesaro","doi":"10.1016/j.envres.2025.122933","DOIUrl":"10.1016/j.envres.2025.122933","url":null,"abstract":"<div><div>Ultrasound (US) treatment represents a promising strategy to enhance energy recovery and waste minimization in anaerobic digestion (AD) systems. However, significant knowledge gaps hinder the effective application of US into full-scale processes. Particularly, the treatment of anaerobically digested sludge (ADS) has received limited attention in the literature, despite its potential to enhance the disintegration of recalcitrant organic fractions and improve the overall energy balance of the AD process. Furthermore, existing research typically investigates the effect of US parameters individually, often neglecting interactions between variables. In this study, the US treatment of ADS was investigated through a multivariable experimental approach. A response surface methodology, specifically a Box–Behnken design, was employed to assess the effects of three key variables, namely the total solids content, the US amplitude, and the treatment duration, on four response factors indicative of organic matter disintegration and solubilization, i.e. disintegration degree, soluble proteins, soluble carbohydrates and volatile fatty acids. Notably, the simultaneous effect of the variables was investigated for the first time, demonstrating significant interactions among the selected variables. A high degree of statistical significance was obtained from the regression-based model fitting. In addition, the study compared US treatment in both static and flow-through configurations, under identical operating conditions, revealing the critical influence of the mixing regime on the overall process performance. The presented findings provide valuable insights for the design and optimisation of US reactors for sludge treatment applications, offering environmentally relevant strategies to improve the valorisation of digestate in wastewater management systems.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"286 ","pages":"Article 122933"},"PeriodicalIF":7.7,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145147057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Unraveling the structural phase transition and electrochemical water splitting of LaVO4/Pd-gC3N4 nanocomposite","authors":"Beena Mol Babu ,&nbsp;Tata Sanjay Kanna Sharma ,&nbsp;Tae-Hee Kim ,&nbsp;Eun-Suok Oh ,&nbsp;Seonghun Lee ,&nbsp;Tae Joo Shin ,&nbsp;Won Mook Choi","doi":"10.1016/j.envres.2025.122939","DOIUrl":"10.1016/j.envres.2025.122939","url":null,"abstract":"<div><div>The development of cost-effective and efficient bifunctional electrocatalysts is vital for sustainable hydrogen production via electrochemical water splitting. In this study, we report the synthesis of a nanorod-shaped lanthanum vanadate (LaVO₄, LaV) integrated with palladium-doped graphitic carbon nitride (Pd-gCN) to form a hybrid LaV/Pd-gCN composite catalyst. Synchrotron X-ray diffraction (SXRD) reveals that LaV crystallizes in a monazite-type structure and undergoes a subtle structural transformation when combined with Pd-gCN, enhancing its catalytic properties. The incorporation of Pd with graphitic carbon nitride (g-C₃N₄) significantly improves its electrical conductivity and introduces additional active sites, facilitating charge transfer and reaction kinetics. Electrochemical analysis demonstrates outstanding bifunctional performance of the LaV/Pd-gCN composite, with low overpotentials of 290 mV for the hydrogen evolution reaction (HER) and 410 mV for the oxygen evolution reaction (OER) at 100 mA cm⁻² in alkaline media. The composite also exhibits excellent stability, retaining over 85 % of its initial activity after 100 h of continuous operation for both HER and OER. The enhanced performance is attributed to the synergistic interaction among La, V, Pd, and the g-C₃N₄ matrix, which promotes favorable electronic structures and interfacial charge transfer. These findings highlight the potential of LaV/Pd-gCN as a promising bifunctional electrocatalyst for overall water splitting, offering a viable alternative to noble metal-based systems.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"286 ","pages":"Article 122939"},"PeriodicalIF":7.7,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}