Journal of Environmental Management最新文献

{"title":"Spatial variability of lacustrine groundwater discharge and pollutant fluxes in the sandy-land lake group basins: Influence from land use types","authors":"Shen Qu ,&nbsp;Xiangwei Li ,&nbsp;Ao Gao ,&nbsp;Yuanzhen Zhao ,&nbsp;Keyi Zhang ,&nbsp;Yiwei Zhang ,&nbsp;Dongchao Huo ,&nbsp;Bowen Ye ,&nbsp;Zongbao Yue ,&nbsp;Renpu Wang ,&nbsp;Hongli Ma ,&nbsp;Ping Miao ,&nbsp;Ruihong Yu","doi":"10.1016/j.jenvman.2025.125224","DOIUrl":"10.1016/j.jenvman.2025.125224","url":null,"abstract":"<div><div>Deciphering lacustrine groundwater discharge (LGD) processes and pollutant fluxes in sandy-land lake basins remain difficult due to the complex hydrogeological conditions and land use types. In this study, the spatial variability of LGD in a sandy-land lake group (Bahannao Lake Group Basin) was quantitatively estimated using the radon (²²²Rn) mass balance model. The 5 lakes in the study area, with their various land use and hydrogeological conditions, were categorized into 3 ranges based on LGD rates: &lt;20.0 mm/d (Shenhaizi Lake: 10.81 mm/d), 20.0–35.0 mm/d (Wulannao Lake: 27.21 mm/d, Bahannao Lake: 30.21 mm/d) and &gt;35.0 mm/d (Guangmingnao Lake: 36.78 mm/d, Manaihu Lake: 43.58 mm/d). From an entropy weighted quality index and hydrochemical analysis, NO₃⁻, TN, TDS, Cl⁻ and Na⁺ from evaporite dissolution and human inputs were the dominant pollutants in the study area. On this basis, the patterns of pollutant fluxes were consistent with LGD rates in the 5 lakes. It was found that the spatial variability of LGD processes in sandy-land lake group basins was controlled mainly by evaporation loss, land use patterns, and industrial and agricultural activities. This study provides new insights into the spatial variability of LGD for global sandy-land lakes in a changing environment.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"381 ","pages":"Article 125224"},"PeriodicalIF":8.0,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759348","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":"Qualitative and quantitative assessment of Sargassum valorisation solutions for the Caribbean","authors":"M. Bennett ,&nbsp;A. March ,&nbsp;H. Li ,&nbsp;P. Lallemand ,&nbsp;J.-P. Maréchal ,&nbsp;P. Failler","doi":"10.1016/j.jenvman.2025.124954","DOIUrl":"10.1016/j.jenvman.2025.124954","url":null,"abstract":"<div><div>The valorisation of Sargassum biomass into various products is seen as a promising solution to mitigate the environmental and economic disruptions caused by massive Sargassum inundations in the Caribbean region. Different applications of Sargassum valorisation have previously been explored but economic assessments of these solutions are absent from publicly available literature which has hindered informed investment support decisions aimed at addressing the biomass influx. A semi-qualitative stakeholder-engagement approach was used to assess 12 Sargassum value chains, with the aim to identify valorisation solutions favourable for investment support and provide indicative costs of implementation. Value chains included biochar; biogas; biofuel; construction materials; liquid bioplastic; powdered bioplastic; flake fertiliser and compost; liquid fertiliser; powdered fertiliser; biotechnological chemical derivation; Sargassum for consumption; and Traditional Chinese Medicine (TCM). The assessment included qualitative comparison according to indicators for an effective solution regarding Sargassum resource dynamics and the Caribbean development context. Quantitative assessment involved model development to compute internal rate of return (IRR), net present value (NPV), and payback period for each solution. Simple value chains were developed as the basis for comparison, and data from previous research and current market prices were used. Biochar, biogas, and compost and fertiliser value chains were recommended for investment support due to favourable model indicators (positive IRR and NPV, low payback period), low-startup investment requirements, scalability potential, low technological processing and skills requirements, value addition potential, adaptability to varied quality of Sargassum biomass and supply challenges, and capacity to consume large amounts of biomass for addressing mass inundations.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"381 ","pages":"Article 124954"},"PeriodicalIF":8.0,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"External voltage regulates hydrogen and vivianite recovery from fermentation liquid in microbial electrolysis cell equipped with iron anode: Performance and mechanism","authors":"Ting Zhao ,&nbsp;Zhihong Liu ,&nbsp;Zhengtong Guo ,&nbsp;Xiaoyun Yin ,&nbsp;Wenhai Zhu ,&nbsp;Zhangwei He ,&nbsp;Wenzong Liu ,&nbsp;Xiuping Yue ,&nbsp;Aijuan Zhou","doi":"10.1016/j.jenvman.2025.125209","DOIUrl":"10.1016/j.jenvman.2025.125209","url":null,"abstract":"<div><div>Employing an iron anode in microbial electrolysis cell (MEC) can promote hydrogen yield and vivianite recovery from waste biomass by accelerating electron transport, but the performance is highly dependent on the functional microbial community present and the ferrous ion content. An external voltage had a significant effect on enriching functional microbes and controlling the release of ferrous ions. In this study, the effects of different voltages, i.e., 0.4 V, 0.6 V, 0.8 V and 1.0 V, on hydrogen production and vivianite recovery were explored. The results indicated that an applied voltage of 0.8 V resulted in the maximum hydrogen productivity of 11.17 mmol/g COD, representing an increase of 18∼91 % compared with the other voltage conditions. The removal efficiency of phosphorus reached 100 % at 3 d in the 0.8 V group, with vivianite as the main product at a purity of 92.7 %. An external voltage of 0.8 V notably enhanced the electrochemical performance of the MEC. The relative abundances of bio-cathodic microbes, i.e., electrochemically active bacteria, anaerobic fermentation bacteria, dissimilatory iron-reducing bacteria and homoacetogens, greatly changed with different voltages, reaching 9.6 %, 3.2 %, 3.1 % and 23.7 %, respectively, in the 0.8 V group. The expression of key functional genes related hydrogen production, i.e., the ferredoxin-dependent hydrogenase pathway and pyruvate ferredoxin oxidoreductase pathway, was significantly upregulated, whereas that related to homo-acetogenesis was downregulated under 0.8 V. This work reveals the performance and mechanism of synergistic hydrogen production and phosphorus recovery under an applied voltage, and provides new insights and feasible measures for improving hydrogen production and phosphorus recovery in MECs.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"381 ","pages":"Article 125209"},"PeriodicalIF":8.0,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759349","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":"U-shaped deep learning networks for algal bloom detection using Sentinel-2 imagery: Exploring model performance and transferability","authors":"Ismail Colkesen ,&nbsp;Mustafacan Saygi ,&nbsp;Muhammed Yusuf Ozturk ,&nbsp;Osman Yavuz Altuntas","doi":"10.1016/j.jenvman.2025.125152","DOIUrl":"10.1016/j.jenvman.2025.125152","url":null,"abstract":"<div><div>Inland water sources, such as lakes, support diverse ecosystems and provide essential services to human societies. However, these valuable resources are under increasing pressure from rapid climate changes and pollution resulting from human activities. Combining remote sensing technologies with advanced artificial intelligence algorithms enables frequent monitoring of these ecosystems, timely detection of potential threats, and effective conservation measures. This study evaluated U-shaped deep learning (DL) networks, including U-Net, Residual U-Net (RU-Net), Attention U-Net, Attention Residual U-Net (ARU-Net), and SegNet, for detecting and mapping algal blooms using Sentinel-2 satellite imagery. Multitemporal Sentinel-2 imagery spanning different dates was used to construct robust DL models, with ground truth datasets representing both high- and low-density algae formations. The study emphasized the importance of diverse datasets in addressing the limitations of previous models, particularly in detecting low-density blooms and generalizing across temporal and geographical contexts. The models' transferability was assessed using imagery from different dates and geographical locations, including Lake Burdur, Lake Chaohu, and Lake Turawskie. RU-Net and ARU-Net consistently outperformed other models, achieving exceptional F-scores, such as 99.80 % for Lake Burdur, 97.23 % for Lake Chaohu, and 99.61 % for Lake Turawskie. ARU-Net demonstrated superior generalization capabilities, effectively detecting low-density algae, which is critical for comprehensive environmental assessments. These findings underscored the efficacy and transferability of U-shaped DL networks in accurately detecting algal blooms, offering valuable insights for environmental monitoring and management applications.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"381 ","pages":"Article 125152"},"PeriodicalIF":8.0,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759344","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":"Impact of particle-attached microbial denitrification on N2O production in an agricultural-urban watershed","authors":"Mengdi Yang ,&nbsp;Hanjie Yang ,&nbsp;Wencai Wang ,&nbsp;Huaiyang Fang ,&nbsp;Lu Huang ,&nbsp;Dan Li ,&nbsp;Lingfang Fu ,&nbsp;Shiyuan Ding ,&nbsp;Xiao-Dong Li ,&nbsp;Cong-Qiang Liu ,&nbsp;Gangjian Wei ,&nbsp;Dongli Li ,&nbsp;Gaoyang Cui ,&nbsp;Zhongya Fan ,&nbsp;Fantang Zeng","doi":"10.1016/j.jenvman.2025.125223","DOIUrl":"10.1016/j.jenvman.2025.125223","url":null,"abstract":"<div><div>Anthropogenically influenced rivers are key hotspots for nitrous oxide (N₂O) emissions. However, the seasonal and spatial heterogeneity of N₂O emissions in subtropical riverine systems, particularly the role of particle-attached microbes (PAM) in regulating N₂O production, remains poorly understood, contributing to uncertainties in global N₂O estimates. This study investigates the potential impacts of PAM-driven nitrogen transformations on N₂O production in the Dongjiang River under agricultural and urban influences. Water samples collected during the wet and dry seasons were analyzed for N₂O concentrations, dual nitrogen-oxygen isotopes (δ¹⁵N-NO₃⁻, δ¹⁸O-NO₃⁻), and metagenomic sequencing of PAM. All samples exhibited N₂O supersaturation, with emissions significantly higher in the dry season than in the wet season. A linearly positive δ¹⁵N–δ¹⁸O correlation, accompanied by lower NO₃⁻ in the bottom layers than the surface layers in the dry season indicates active denitrification, leading to elevated N₂O concentrations. PAM-driven denitrification was identified as the dominant nitrogen transformation process, supported by higher abundances of denitrification genes (<em>nirKS</em>, <em>norBC</em>, <em>nosZ</em>) relative to nitrification genes (<em>amoABC</em>). Despite aerobic water column conditions, low-oxygen microhabitats around suspended particles facilitated N₂O production. A significantly positive correlation (<em>p</em> &lt; 0.05, R² = 0.42) between N₂O concentrations and the <em>nirK</em>/<em>nosZ</em> gene ratio suggests that gene expression imbalances contributed to net N₂O accumulation. Additionally, the downstream urban area exhibited lower DO and higher DOC levels, enhancing denitrification and increasing N₂O production by 4.7 % compared to the upstream agricultural region. Seasonal differences further influenced N₂O dynamics: higher DOC/NO₃⁻ ratios in the dry season promoted heterotrophic denitrification, while elevated temperatures in the wet season favored complete denitrification, reducing N₂O emissions. These findings provide critical insights into PAM-driven nitrogen cycling, informing strategies for mitigating N₂O emissions and managing nitrogen pollution in subtropical riverine systems.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"381 ","pages":"Article 125223"},"PeriodicalIF":8.0,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759350","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":"Enhanced bryophyte communities, but challenges for lichens following translocation of deadwood in ecological compensation","authors":"Olov Tranberg ,&nbsp;Therese Löfroth ,&nbsp;Mari Jönsson ,&nbsp;Jörgen Sjögren ,&nbsp;Anne-Maarit Hekkala ,&nbsp;Joakim Hjältén","doi":"10.1016/j.jenvman.2025.125161","DOIUrl":"10.1016/j.jenvman.2025.125161","url":null,"abstract":"<div><div>Habitat restoration and ecological compensation are gaining attention as methods to offset habitat loss from landscape exploitation, but few studies assess their impact on species and communities, particularly in boreal forests. We evaluated a novel ecological compensation method; the translocation of deadwood and associated species from an impact area to a compensation area. Our study focused on assessing species richness and assemblage composition of epiphytic bryophytes and lichens on translocated (637 substrates) and naturally occurring Scots pine (<em>Pinus sylvestris</em> L.) and Norway spruce (<em>Picea abies</em> (L.) H. Karst) logs in a compensation area in northern Sweden. We also assessed the effects of translocated deadwood density and dead wood type on these assemblages. We recorded 52 bryophyte species and 38 lichen species. For lichens, only species confined to deadwood were included. Translocated logs significantly altered bryophyte and lichen assemblages in the translocation plots. Bryophyte richness increased over time as colonization was higher than species loss, while lichen richness remained stable with colonization of new species and disappearance of translocated species occurring at similar rates. Bryophyte colonisations mainly involved generalist forest species. Higher deadwood density in translocation plots increased bryophyte species richness but had no effect on lichens, whereas diverse deadwood types promoted conservation success for both groups. Logs of intermediate decay and snags (deadwood originating from standing dead trees) supported distinct communities, though lichen species on snags declined four years post-translocation. Our results highlight the need to include diverse substrates in conservation translocations to maximize the number of translocated species. Although translocating entire communities presents challenges, it offers a promising tool for species conservation and ecological restoration.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"381 ","pages":"Article 125161"},"PeriodicalIF":8.0,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal sensitivity and rising greenhouse gas emissions in riparian zone soils: Implications for ecosystem carbon dynamics","authors":"Shuxun Cheng ,&nbsp;Amit Kumar ,&nbsp;Guoxin Lan ,&nbsp;Wenling Zhang ,&nbsp;Zhuolin Yu ,&nbsp;Shuai Zhang ,&nbsp;Zhi-Guo Yu ,&nbsp;Meijuan Yao ,&nbsp;Junjie Lin","doi":"10.1016/j.jenvman.2025.125194","DOIUrl":"10.1016/j.jenvman.2025.125194","url":null,"abstract":"<div><div>Riparian zones, critical interfaces between aquatic and terrestrial ecosystems, play a significant role in global carbon dynamics and greenhouse gas (GHG) emissions. This study investigates the thermal sensitivity (Q₁₀) of soil organic carbon decomposition and its implications for GHG emissions in the riparian soils of the Three Gorges Reservoir, China. Through a 42-day incubation experiment at four temperatures (15 °C, 22 °C, 29 °C, and 36 °C), we quantified the Q₁₀ values for methane (CH₄) and carbon dioxide (CO₂) emissions, revealing spatial heterogeneity and a positive correlation with temperature. The Q₁₀ for CH₄ (2.5) was significantly higher than for CO₂ (1.4), indicating a stronger temperature sensitivity of CH₄ emissions. Structural equation modeling identified soil pH and mean annual temperature as key drivers of Q₁₀ variations. Projections based on Shared Socioeconomic Pathways from the IPCC-AR6 suggest that by 2100, CH₄, CO₂, and CO₂-equivalent emissions from riparian zones could increase by 4.9–44.3 %, 4.3–17.4 %, and 4.0–20.0 %, respectively. These findings underscore the importance of riparian zones in climate feedback loops and highlight the need for targeted management strategies to mitigate GHG emissions in these vulnerable ecosystems.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"381 ","pages":"Article 125194"},"PeriodicalIF":8.0,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759354","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":"Predicting and investigating water quality index by robust machine learning methods","authors":"Zhoulin Han ,&nbsp;Shijing Zhang ,&nbsp;Liangqing He ,&nbsp;Bin zhu","doi":"10.1016/j.jenvman.2025.125156","DOIUrl":"10.1016/j.jenvman.2025.125156","url":null,"abstract":"<div><div>This study addresses the critical challenges of waste management and water quality in urban environments, where accelerated urbanization has exacerbated environmental degradation and public health risks. Employing advanced machine learning algorithms—Long Short-Term Memory (LSTM), Random Forest (RF), Decision Tree (DT), and Support Vector Machine (SVM)—this research predicts the Water Quality Index (WQI) to improve urban environmental management. The novelty lies in the integration of multiple algorithms within a single framework, focusing on classifying WQI labels (1–9) for \"good\" to \"poor\" water quality, a departure from traditional continuous value predictions. Among the algorithms, LSTM demonstrated the most significant advantages, achieving superior predictive accuracy and precision across training, testing, and validation datasets, with RMSE values of 0.0611, 0.0810, and 0.0754 and R² values consistently above 0.9964. Comparative analysis revealed LSTM's capacity to capture complex temporal dependencies in data, surpassing RF, DT, and SVM in predictive performance. This approach provides actionable insights into WQI dynamics, enabling the identification of key pollution factors, optimizing waste management practices, and supporting real-time decision-making. The integration of climate indicators into the models further enhances their applicability in addressing long-term trends associated with climate change. Statistical evaluations, including AARE and SD, corroborate LSTM's robustness and reliability, making it a transformative tool for urban water quality prediction. This research pioneers a scalable, efficient, and practical solution to urban environmental challenges, contributing to sustainable resource management and improved public health outcomes.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"381 ","pages":"Article 125156"},"PeriodicalIF":8.0,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759457","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":"Comparative analysis of evapotranspiration and water yield in basins of the Northern Gulf of America between the past and next 40 years","authors":"Ying Ouyang","doi":"10.1016/j.jenvman.2025.125157","DOIUrl":"10.1016/j.jenvman.2025.125157","url":null,"abstract":"<div><div>The Northern Gulf of America (NGOA, formerly known as Northern Gulf of Mexico) is a key economic region for seafood production, recreation, and marine transportation. This study compared evapotranspiration (ET) and water yield in the Sabine River Basin (SRB) and Pearl River Basin (PRB) along the NGOA, focusing on coastal watersheds between two 40-year weather scenarios: past (1985–2024) and future (2025–2064). The analysis was conducted using the HAWQS (Hydrologic and Water Quality System) model, along with Mann-Kendall (M-K) and Kolmogorov-Smirnov (K-S) tests. Simulations showed a two-month shift in the timing of maximum monthly water yield, moving from January in the past scenario to March in the future scenario at the coastal watersheds. Monthly water yield was closely correlated to monthly precipitation, indicating that precipitation played a crucial role in producing water yield. Seasonal ET was roughly twice as high in spring and summer compared to fall and winter, while seasonal water yield was about twice as large in spring and winter compared to fall and summer. Future annual ET at the coastal watersheds were moderately or slightly higher than that of the past, while both the past and future annual ETs were lower in the northernmost (inland) watersheds than in the southernmost (coastal) watersheds. Overall, impacts of weather variation on ET and water yield varied among basins in the NGOA. These findings offer valuable insights to water resource managers, helping them make more informed decisions to mitigate water evaporative losses and increase water yield in coastal watersheds of the NGOA and the similar conditions around the world.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"381 ","pages":"Article 125157"},"PeriodicalIF":8.0,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759347","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":"The pH-sensitive polymerization process of phenol on hexagonal birnessite","authors":"Haibo Liu ,&nbsp;Bo Chen ,&nbsp;Ziyang Chu ,&nbsp;Zhengyan Han ,&nbsp;Fuwei Sun ,&nbsp;Hao Wang ,&nbsp;Xuehua Zou ,&nbsp;Tianhu Chen","doi":"10.1016/j.jenvman.2025.125144","DOIUrl":"10.1016/j.jenvman.2025.125144","url":null,"abstract":"<div><div>Birnessite, a common manganese oxide present in soil, interacts with organic compounds through various mechanisms, including adsorption, oxidative decomposition, and oxidative polymerization. However, this polymerization pathway has been relatively underreported. This study focuses on the reaction pathways of phenols on hexagonal birnessite and the contribution of polymerization process. The results indicate that about 94 % of phenol can be effectively removed by birnessite from solution via polymerization and degradation processes under acidic conditions. When solution initial pH is 2.0, approximately 80 % of phenol undergoes the polymerization pathway, which is predominantly influenced by solution pH, while the other 20 % undergoes degradation pathway. The polymeric products and intermediates were further analyzed. Moreover, the polymerization mechanism was elucidated. Specifically, the zero-point charge (pH_PZC) of the hexagonal birnessite is 2.44. When the solution pH is below this pH_PZC, phenol is adsorbed to the surface of birnessite, subsequently undergoing a two-electron transfer process to generate phenoxonium ion intermediates, which subsequently condense into multimers. These findings provide new insights into the influence of birnessite on the fate of phenolic pollutants through the polymerization mechanism.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"381 ","pages":"Article 125144"},"PeriodicalIF":8.0,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759353","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}