Environmental Pollution最新文献

{"title":"Pollution profiles, pathogenicity, and toxicity of bioaerosols in the atmospheric environment of urban general hospital in China","authors":"Simin Huang, Yuxuan Wei, Weibang Yang, Yufei Zhao, Qiwen Wang, Ranjit Das, Chunyou Zhu, Xiaofeng Jiang, Zhishu Liang","doi":"10.1016/j.envpol.2025.125739","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.125739","url":null,"abstract":"Airborne microorganisms in hospitals present significant health risks to both patients and employees. However, their pollution profiles and associated hazards in different hospital areas remained largely unknown during the extensive use of masks and disinfectants. This study investigated the characteristics of bioaerosols in an urban general hospital during the COVID-19 pandemic and found that airborne bacteria and fungi concentrations range from 87±35 to 1037±275 CFU/m³ and 21±15 to 561±132 CFU/m³, respectively, with the outpatient clinic and internal medicine ward showing the highest levels. The operating room (OR) and clinical laboratory (LA) had lower bioaerosol levels but higher microbial activities, suggesting that disinfection procedures used to clean bioaerosols may change them into a viable but non-culturable state. The dominant fungi were <em>Cladosporium</em>, <em>Aspergillus,</em> and <em>Penicillium</em>, while the most common viruses were <em>human associated gemykibivirus</em> 2 and <em>human alpha herpesvirus</em> 1. Besides, the dominant pathogens were <em>Staphylococcus aureus</em>, <em>Salmonella enterica</em>, and <em>Pseudomonas aeruginosa</em>. Bacitracin and macrolides resistance genes <em>bacA</em> and <em>ermC</em> were the most prevalent subtypes of antibiotic resistance genes. Compared to the control sample, hospital-acquired bioaerosols, particularly from the outpatient examination room and emergency room can trigger higher levels of inflammatory factors and cell toxicity but lower cell proliferation rates. Lower cell toxicity was observed in low-risk areas (intensive care unit, LA, and OR). This study provides a new method for assessing bioaerosol health risks and enhances understanding of nosocomial and opportunistic infections and their control.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"62 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026372","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":"Placental PFAS concentrations are associated with perturbations of placental DNA methylation","authors":"Todd M. Everson, Neha Sehgal, Kyle Campbell, Dana Boyd Barr, Parinya Panuwet, Volha Yakimavets, Kelsey Chen, Cynthia Perez, Kartik Shankar, Stephanie M. Eick, Kevin J. Pearson, Aline Andres","doi":"10.1016/j.envpol.2025.125737","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.125737","url":null,"abstract":"The placenta is crucial for fetal development, is affected by PFAS toxicity, and evidence is accumulating that gestational PFAS perturb the epigenetic activity of the placenta. Gestational PFAS exposure can adversely affect offspring, yet individual and cumulative impacts of PFAS on the placental epigenome remain underexplored. Here, we conducted an epigenome-wide association study (EWAS) to examine the relationships between placental PFAS levels and DNA methylation in a cohort of mother-infant dyads in Arkansas (N=151). We measured 17 PFAS in human placental tissues and quantified placental DNA methylation levels via the Illumina EPIC Microarray. We tested for differential DNA methylation with individual PFAS, and with mixtures of multiple PFAS. Our results demonstrated that numerous epigenetic loci were perturbed by PFAS, with PFHxS exhibiting the most abundant effects. Mixture analyses suggested cumulative effects of PFOA and PFOS, while PFHxS may act more independently. We additionally explored whether sex-specific effects may be present and concluded that future large studies should explicitly test for sex-specific effects. The genes that are annotated to our PFAS-associated epigenetic loci are primarily involved in growth processes and cardiometabolic health, while some genes are involved in neurodevelopment. These findings shed light on how prenatal PFAS exposures affect birth outcomes and children's health, emphasizing the importance of understanding PFAS mechanisms in the in-utero environment.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"11 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020122","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":"Underestimated Industrial Ammonia Emission in China Uncovered by Material Flow Analysis","authors":"Peilin Chen, Qin’geng Wang","doi":"10.1016/j.envpol.2025.125740","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.125740","url":null,"abstract":"Ammonia (NH₃) is crucial in fine particulate matter (PM_2.5) formation, but past estimations on industrial NH₃ emissions remain highly uncertain. In this study, the flow of NH₃ within air pollution control devices (APCDs) were investigated basing on material flow analysis with in-situ measurements of NH₃ concentrations at the inlets and outlets of each APCD. Then, by combing emission factors updated with recent in-situ measurements and provincial-level activity data from statistical yearbooks and associated reports, NH₃ emissions from various industrial sources, as well as their spatial distribution across China in 2020, were evaluated. It was estimated that, on average, over 70% of NH₃ at APCD inlets is captured by fly ash, about 25% adheres to the inner walls and desulfurization slurry, and less than 5% is directly emitted. The captured filterable NH₃ is later released during subsequent treatment processes, contributing 34.48% to the NH₃ entering APCDs. In total, 38.82% of the NH₃ entering APCDs is ultimately emitted as gaseous NH₃, in which direct and indirect emission accounts for 11.26%and 88.74%, respectively. In 2020, the industrial NH₃ emissions in China were calculated to be 268.02 × 10⁴ t, constituting about 21.19% of total anthropogenic NH₃ emission, and nearly 3-10 times higher than previous estimations in current bottom-up inventories. Flue gas denitrification accounts for the majority (∼60%) of the industrial emission. Regional distribution demonstrates significant spatial variations, with North, East, Central and South China having the highest emission intensities, generally exceed 0.60 t·km^-2·a^-1, more than twice the national average. This study suggests that industrial NH₃ emissions may play a more critical role in air pollution than previously expected, and underscores the importance to reassess the industrial NH₃ emission in China as well as its environmental impacts.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"62 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026371","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":"Preterm Births Attributable to Criteria Air Pollutant Exposure in Bangladesh During 2015-2019","authors":"Debatosh B. Partha, Sumiya Yasmin, Hrithik Nath","doi":"10.1016/j.envpol.2025.125742","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.125742","url":null,"abstract":"Criteria air pollutant exposure impacts human health through various pathways. Preterm birth (PTB) is one of the major adverse birth outcomes (ABO) associated with such exposure. Although numerous global and regional studies have been conducted on this issue, few have recently investigated the impact of major criteria air pollutant exposure on PTBs in Bangladesh, one of the world’s most polluted countries with the highest relative PTB rate. In this study, we retrieved high-resolution criteria air pollution data from recent studies and regionally scaled it to 10 km <span><math></math></span> 10 km resolution. We incorporated the MERRA-2 model, satellite measurements, and exposure-response modeling to quantify the impacts of CO, O₃, PM_2.5, SO₂, and NO₂ exposure on PTBs in Bangladesh from 2015 to 2019. We observed the highest all-source CO, O₃, PM_2.5, SO₂, and NO₂ exposure in 2018 at 272.8 <span><math></math></span>/m³, 88.2 ppbv, 62.9 <span><math></math></span>/m³, 20.5 <span><math></math></span>/m³, and 11.6 ppbv, respectively. These exposures were associated with 0.18 million [95% confidence interval (95%CI): 0.08 – 0.29 million] to 0.20 million [95%CI: 0.08 – 0.32 million] annual total PTBs among 4.3 million annual total live births, indicating an alarming 4.4–4.9% PTB rate exclusively attributable to the exposure to these five criteria air pollutants. Within these PTB estimates, our study found that combined CO, O₃, and PM_2.5 exposure caused the majority (94.7–95.8%) of the total PTBs, with hotspots in the central and southern regions of Bangladesh. This study provides quantitative evidence of the PTB incidence caused by major criteria air pollutant exposure and discusses the urgency of the targeted reduction of pollutants as well as source control to reduce the risks of PTBs, which is critical for the overall well-being of the overpopulated and underrepresented women and children of Bangladesh.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"25 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026365","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":"Lead/Cadmium Impacts on Zeolite-Tobermorite: Nutrient Release and Sediment Stability","authors":"Yanfei Tian, Xianshu Dong, Chunsheng Deng, Dong Yang, Xiaoya Ma, Yanze Mu","doi":"10.1016/j.envpol.2025.125688","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.125688","url":null,"abstract":"To realize the comprehensive utilization of large amounts of high-ash coal slime and comprehensively understand the excellent performance of nutrient release and lead and cadmium adsorption of high-ash coal slime silicon composite materials, green and safe mild hydrothermal conditions (200 °C) were used to prepare the rich-rich coal slime. Zeolite/tobermorite composites (Z-TOBs) were used in this study. Batch adsorption tests and repeated extraction tests were used to determine whether silicon, potassium, and calcium nutrients of Z-TOBs have sustained release properties and are affected by pH. Through temperature gradient analyses, batch adsorption experiments at the water-soil interface, and density functional theory (DFT) calculations, the nutrient release mechanisms and the passivation of lead (Pb) and cadmium (Cd) by Z-TOBs were comprehensively investigated. The findings indicated that the release of silicon, calcium, and potassium nutrients from Z-TOBs was influenced by both ambient temperature and Pb and Cd concentrations. As the ambient temperature increased, the release patterns of different nutrients from Z-TOBs varied significantly, and the release of Pb and Cd was enhanced; however, the adsorption capacity for Pb consistently exceeded that for Cd. The passivation effect of soil amended with Z-TOBs on Pb remained stronger than that on Cd, significantly impacting the release of silicon. Characterization results revealed that silicon participated in the formation of silicon-containing compounds such as Cd₂SiO₄, CdAl₂Si₃O₁₂, and Pb₃Si₂O₇. The skew density calculated using DFT indicated that the silicic acid compounds formed with Pb and Cd exhibited greater stability than those formed with CO₃^2- and SO₄^2- groups, with Pb compounds demonstrating superior stability compared to Cd compounds. This study offers both practical and theoretical insights for the comprehensive utilization of high-ash coal slime in mild environments, presenting an alternative pathway for sustainable agricultural development.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"33 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020124","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":"Evaluating the tolerance of harmful algal bloom communities to copper","authors":"Ashley V. Hennessey, Michael B. McDonald, Peyton P. Johnson, Matthew F. Gladfelter, Kate L. Merrill, Suzanne E. Tenison, Sathya S. Ganegoda, Tham C. Hoang, H. Allen Torbert, Benjamin H. Beck, Alan E. Wilson","doi":"10.1016/j.envpol.2025.125691","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.125691","url":null,"abstract":"Harmful algal blooms (HABs) cause severe economic and environmental impacts, including hypoxic events and the production of toxins and off-flavor compounds. Chemical treatments, such as copper sulfate pentahydrate (CuSO₄·5H₂O), are often used to mitigate the damaging effects of algal blooms. However, treatment effects are usually short-lived leading to waterbodies requiring repeated CuSO₄·5H₂O applications to control persistent algal blooms, particularly in highly eutrophic systems, such as aquaculture ponds or small agricultural impoundments. We hypothesized phytoplankton communities routinely treated with Cu develop community tolerance to treatment, making algal blooms more difficult to manage over time. Pollution-induced community tolerance is a method for measuring how a community can withstand selective pressures to a toxicant. To test whether phytoplankton develop community tolerance to algaecidal treatment, the toxic effects of Cu were evaluated at a standard dose (1.37 mg/L CuSO₄·5H₂O or 0.35 mg/L total Cu) and a low dose (0.69 mg/L CuSO₄·5H₂O or 0.17 mg/L total Cu) relative to untreated controls. Treatments were applied once to 1,300 L mesocosm enclosures installed in a productive aquaculture pond and monitored for 28 days Acute toxicity bioassays measured photosynthetic efficiency across a wide range of Cu concentrations (0.05 to 300 mg/L). The PICT bioassay results were used to generate dose-response curves for median effective concentrations (EC50s) to assess phytoplankton community tolerance to Cu toxicity. The results of this study showed that both doses of Cu led to over 99% removal of cyanobacteria in the first seven days and maintained a reduction in cyanobacterial abundance by at least 70% throughout the experiment. After three days of exposure, the phytoplankton communities in the standard and low-dose treatments exhibited a 12.4x and 5.2x increase in Cu community tolerance, respectively, compared to controls. This increase in community tolerance was driven by Cu-tolerant chlorophyte species. These findings suggest that, while community tolerance to Cu may alter the perceived effectiveness of treatment over time, it can promote a beneficial shift from cyanobacteria to chlorophyte species, ultimately contributing to a more sustainable system.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"14 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992207","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":"Keystone bacterial groups dominate Escherichia coli O157:H7 survival in long-term reclaimed water headwater stream","authors":"Di Zhu, Zhangheng Feng, Bin He, Jinyi Li, David Z. Zhu, Jinbo Xiong, Zhiyuan Yao","doi":"10.1016/j.envpol.2025.125738","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.125738","url":null,"abstract":"<em>Escherichia coli</em> (<em>E. coli</em>) O157:H7 is a highly pathogenic zoonotic bacterium, with water serving as a key medium for its environmental transmission. However, the survival characteristics of <em>E. coli</em> O157:H7 in reclaimed water environments remain poorly understood, which has, to some extent, hindered the development of water reuse technologies. This study examined the survival dynamics of <em>E. coli</em> O157:H7 in a long-term reclaimed water headwater stream through inoculation experiments and identified its main drivers. The results showed that the survival time of <em>E. coli</em> O157:H7 was the longest in the headwater upstream (up to 62 days), gradually decreased as it flowed downstream. Among physicochemical factors, chloride ion, potential of hydrogen, and electrical conductivity were the main factors affecting the survival of <em>E. coli</em> O157:H7. The microbial diversity shown by the alpha diversity index had no significant impact on the <em>E</em>. <em>coli</em> O157:H7 survival. Meanwhile, certain keystone bacterial groups, such as <em>Polynucleobacter</em>, <em>Roseomonas</em>, and <em>Luteolibacter</em>, which are primarily involved in the decomposition of organic matter, suppressed <em>E. coli</em> O157:H7 survival in this stream, while <em>Nitrospira</em>, <em>Dechloromonas</em>, and <em>Sphingomonas</em> promoted the survival of <em>E. coli</em> O157:H7. Overall, the biotic factors have a more direct impact on the <em>E. coli</em> O157:H7 survival compared to abiotic factors in the reclaimed water-replenished stream and deserve more attention. Our research revealed higher biological risks in the upstream sections of the long-term reclaimed water headwater stream, which helped deepen our understanding of pathogen survival in water environments and enhancing our awareness of the biological safety of reclaimed water in ecological replenishment processes.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"49 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020128","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":"Defining air quality standards for pesticides through population exposure modeling","authors":"Yabi Huang, Zijian Li","doi":"10.1016/j.envpol.2025.125735","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.125735","url":null,"abstract":"Atmospheric pesticide pollution is a global problem that poses risks to human health. However, controlling air pollution remains challenging, as few countries have established air quality standards (AQS) for pesticides. Here, we proposed a modeling framework based on human exposure assessment, comprising scenarios: screening, advanced, and aggregated. In addition, the AQSs of 13 selected pesticides in China were simulated using this framework as practice. In the screening scenario, the inhalation rates by age were included in the exposure assessment. The results showed that the adjusted exposure coefficients (θ_screening) were below 1 in young age groups, indicating that the derived AQS_screening should be stricter than the reference concentration (RfC) to ensure sufficient protection across all age groups. For the advanced scenario, outdoor and indoor conditions, as well as physical activity levels were incorporated into the exposure assessment. The results revealed that adjusted coefficients (θ_adv) exceeded 1 at all age groups, suggesting that a more lenient AQS could be appropriated for a pesticide in this scenario. For the aggregated scenario, exposure source allocation within the human body was considered in the exposure assessment to ensure a sufficient safety margin. The result found that the simulated adjusted coefficients (θ_adv) were generally two to four orders of magnitude below 1. This scenario could provide the most conservative simulated AQSs. In conclusion, the proposed framework can assist environmental agencies in comprehensively assessing human exposure and provide the potential adjusted coefficients for AQS derivation. Future research is recommended to refine the framework with more factors related to human exposure.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"2 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992208","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":"Picoxystrobin causes mitochondrial dysfunction in earthworms by interfering with complex enzyme activity and binding to the electron carrier cytochrome c protein","authors":"Wentian Zhao, Kai Wang, Xiyan Mu, Jiazhen Jiang, Yang yang, Chengju Wang","doi":"10.1016/j.envpol.2025.125732","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.125732","url":null,"abstract":"Picoxystrobin (PICO) poses a great threat to earthworms due to its widespread use in agriculture and its stability in soil. Mitochondria may be a sensitive target organ for the toxic effects of PICO on worms. Therefore, evaluating the effect of PICO on mitochondria can further understand the toxic mechanism of PICO to earthworms. Here, we investigated the mechanism of mitochondrial toxicity of PICO to earthworms at environmentally relevant concentrations (62.5, 125 and 250 μg/kg). Transmission electron microscopy observed that PICO disrupted mitochondrial ultrastructure. PICO reduced mitochondrial membrane potential and inhibited the expression of mitochondrial dynamics proteins of 51 kDa (MiD51). PICO interfered with the electron transport chain (ETC) complex activity and the relative transcription of its subunits. In particular, PICO inhibited complex III activity, cytochrome c (Cyt c, an electron carrier protein that transfers electrons from complex III to complex IV) activity, and ATP level. These changes were observed at PICO concentrations as low as 62.5 μg/kg. Molecular docking analysis indicated that PICO can directly bind to Cyt c with a minimum free energy of -7.84 kcal/mol, thus hindering electron transfer in the ETC. This study confirmed that PICO induces mitochondrial dysfunction in earthworms and contributes to effective pesticide management.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"31 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990656","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":"Adsorption of perfluorooctanoic acid from aqueous matrices onto chitosan-modified magnetic biochar: Response surface methodology-based modeling, performance, and mechanism","authors":"Bhavini Saawarn, Byomkesh Mahanty, Subrata Hait","doi":"10.1016/j.envpol.2025.125734","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.125734","url":null,"abstract":"Perfluorooctanoic acid (PFOA) removal has gained significant attention due to its environmental stability and potential toxicity. This study aims to synthesize a chitosan-modified magnetic biochar (CS_MBC) for efficient PFOA removal from aqueous solutions. Various CS loading ratios (0.25:1, 0.5:1, and 1:1) were explored to determine the optimal adsorbent, with preliminary experiments exhibiting superior performance of CS₁_MBC. To explore the impact of various experimental conditions (pH, adsorbent dose, time, and initial PFOA concentrations) on PFOA removal and optimize these parameters, central composite design of response surface methodology was applied. Statistical analysis of variance was conducted to assess the model’s adequacy, which demonstrated a strong correlation between experimental results and the model. The predicted optimal conditions for achieving maximum PFOA removal (∼94%) were pH 4, 120 mg/L dose, 60 min time, and 20 mg/L PFOA concentration. The kinetics and isotherm studies revealed that the pseudo-second-order (R²=0.9996) and Redlich-Peterson (R²=0.999) models better described PFOA adsorption, with Langmuir maximum adsorption capacity of ∼517 mg/g. Thermodynamic study confirmed the spontaneous, endothermic, and physisorptive nature of PFOA adsorption, with electrostatic and hydrophobic interactions and hydrogen bonding governing the process. Further, the fixed-bed column experiment was conducted to evaluate the effectiveness of CS₁_MBC for practical applications, which demonstrated the maximum experimental adsorption capacity of 39.63 mg/g. The breakthrough data showed an excellent fit with both the Thomas and Yoon-Nelson models, with a high correlation coefficient (R²=0.99). Therefore, this research underscores the potential of CS_MBC as an efficient adsorbent for mitigating PFOA contamination in aqueous environments.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"74 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992210","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}