Environmental Research最新文献

{"title":"Facile and enlargeable preparation of piezocatalytic CaCO₃ for efficient degradation of organic dyes.","authors":"Yunong Zhao, Lin Zhou, Dongliang Xiang, Zhanghong Guo, Chan Wang, Qijun Song","doi":"10.1016/j.envres.2024.120649","DOIUrl":"https://doi.org/10.1016/j.envres.2024.120649","url":null,"abstract":"<p><p>Piezoelectric catalysis has emerged as a promising green technology for implementing pollutant degradation and H₂O₂ production. The use of environment friendly and abundantly available piezocatalysts is critical for practical applications. This work presents the preparation of various morphological CaCO₃ via a simple precipitation method in the absence or presence of different templates. The piezoelectric force microscopy (PFM) characterization demonstrates that the porous CaCO₃ has excellent piezoelectric activity, which also demonstrates its efficient production of H₂O₂ and degradation of organic dyes. A production rate of H₂O₂ of 331 μmol·g^-1·h^-1 and a degradation rate of 0.22535 min^-1 for 5 mg/L Rhodamine B (RhB) were achieved under conventional ultrasonic agitation. The mechanistic investigations along with the H₂¹⁸O control experiment revealed that the piezocatalytic production of H₂O₂ mainly follows the oxygen reduction reaction (ORR) pathway. Furthermore, this research work has successfully achieved the large-scale preparation of CaCO₃, and the properties of the prepared CaCO₃ remain stable during the expansion of the preparation scale. Considering the simple, cost-effective and readily-scale-up preparation, the piezocatalytic CaCO₃ should have a great potential for the degradation of organic dyes.</p>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":" ","pages":"120649"},"PeriodicalIF":7.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142851853","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":"Professionally and non-professionally applied household insecticides during pregnancy and early life and their associations with autism spectrum disorder and developmental delay in the CHARGE case-control study.","authors":"Amanda J Goodrich, Daniel J Tancredi, Yunin J Ludeña, Deborah H Bennett, Irva Hertz-Picciotto, Rebecca J Schmidt","doi":"10.1016/j.envres.2024.120651","DOIUrl":"https://doi.org/10.1016/j.envres.2024.120651","url":null,"abstract":"<p><strong>Background: </strong>Autism Spectrum Disorder (ASD) is an increasing concern globally, with risks attributed to both genetic and environmental factors, including pesticide exposures. The CHARGE case-control study collected data to examine the relationship between household insecticide use and ASD or developmental delay (DD).</p><p><strong>Methods: </strong>Participants (n=1,526) aged 2 to 5 years from the CHARGE study encompassed children with clinically confirmed ASD (n = 810), DD (n = 186), and typically developing controls (n = 530) frequency matched to ASD children by age, sex, and geographic region. Household insecticide use was determined from parent interviews, as were the timing, frequency, and type of applications (professionally or non-professionally applied; indoor, outdoor, and flea applications) from three months pre-conception to the child's second birthday. Logistic regression models were adjusted for confounders to estimate odds ratios (OR) for ASD or DD associated with insecticide exposure.</p><p><strong>Results: </strong>Professionally applied indoor insecticides were associated with greater than two-fold increased odds of ASD for all time periods (OR: pre-pregnancy, 2.62 (1.26, 5.44); pregnancy, 2.52 (1.41, 4.48); year 1, 2.20 (1.33, 3.64); year 2, 2.13 (1.29, 3.49)). Odds were also elevated for any outdoor application during years 1 and 2 (OR: 1.37 (1.05, 1.79) and 1.34 (1.03, 1.74), respectively), however, significance did not hold after false discovery rate correction. Higher exposure frequency was associated with greater odds of ASD for nearly all application types and time periods. Non-professional indoor insecticide use was associated with increased odds of DD in trimester 3 and the pregnancy period (OR: 1.72 (1.03, 2.89) and 1.58 (1.03, 2.40), respectively).</p><p><strong>Conclusion: </strong>Professionally applied indoor insecticides were consistently associated with ASD. The strong trend of increased odds with more frequent exposures, additional evidence for DD, and widespread use of household insecticides support increased regulatory scrutiny and public health interventions to minimize exposure during critical developmental windows.</p>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":" ","pages":"120651"},"PeriodicalIF":7.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142851854","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 Airborne Algae, Ambient Air Pollution and Lung Function in a cross-sectional Canadian population-based study.","authors":"Robert Dales, Dawn Jurgens, Anna Delic, Sabit Cakmak","doi":"10.1016/j.envres.2024.120640","DOIUrl":"https://doi.org/10.1016/j.envres.2024.120640","url":null,"abstract":"<p><p>Airborne algae have been associated with respiratory illness in the setting of coastal harmful algae blooms but little is known about their effects in urban populations distributed across a country, and whether ambient air pollution is an effect modifier. Using cross-sectional data from 11,256 participants of the Canadian Health Measures Survey (CHMS), we tested the association between lung function expressed as a forced expiratory volume (FEV₁) and airborne concentrations of algae measured by a rotation impact sampler in the participant's city of residence on the day of spirometric testing. The daily upper 95^th percentiles of algae ranged from 12.7 to 104.3 grains/m³. An interquartile range increase in algae was associated with a 2.55% (95%CI: 1.88, 3.23) decrease in percent predicted 1-second forced expiratory volume pp FEV₁, and a 2.54% (95%CI: -2.93, -2.14) decrease in pp FEV₁/forced vital capacity (FVC) after adjustment for participants' age, sex, education, annual income, active cigarette smoking, environmental tobacco smoke exposure, fine particulate air pollution (PM_2.5), total fungal spores and total pollen grains. An interquartile increase in PM_2.5 was associated with a 0.86% (95%CI: 0.78, 0.94) decrease in FEV₁, but we found no significant interaction between air pollutants and algae. Our findings suggest that independent of air pollution, airborne algae may influence lung function in urban populations widely distributed across Canada, and the observed effect was of larger magnitude than that of air pollution.</p>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":" ","pages":"120640"},"PeriodicalIF":7.7,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142845376","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":"Role of bio-chemical scale interactions in the Co-landfill of municipal solid waste and bottom ash.","authors":"Ke Huang, Qian Wang, Guangyu Cui, Xinyue Bai, Tong Wang, Ning Wang, Chao Zhang, Qiyong Xu","doi":"10.1016/j.envres.2024.120617","DOIUrl":"10.1016/j.envres.2024.120617","url":null,"abstract":"<p><p>Co-landfill of municipal solid waste (MSW) and bottom ash (BA) has accelerated the scaling of the leachate collection systems (LCS). The matrix of biofilm formation and mineral deposition makes the scaling process in LCS more complicated. However, the fate of metals released from BA and the role of microorganisms in the leachate, which determine the chemical and biological scaling, are not well understood; the scale adsorption ability is little discussed. We analyzed the microorganism response and scale properties under various simulated landfill conditions with different MSW to BA ratios. The adsorption ability of the scales was evaluated through ultrasonic treatment. Scale characterization revealed that Ca²⁺ plays different roles with co-landfilled BA. Under BA-only landfilling conditions, Ca²⁺ was precipitated as CaCO₃, with a strong adsorption ability. The co-landfilling of BA and MSW resulted in the formation of a thicker scale compared to BA landfilling alone. Interestingly, the hydrophilic surface of the biofilm enhanced the descaling efficiency, achieving up to 85%. Microbial composition analysis at the genus level revealed that the co-landfilling with BA significantly influenced the microbial community. Particularly, BA enhanced the biofilm formation ability of the microorganisms. Additionally, the scales adhering to polyvinyl chloride (PVC) pipes developed a distinct microenvironment different from the leachate, with a noticeable increase in anaerobic bacteria. These findings offer new insights into scale control and pipeline failure caused by aging and corrosion.</p>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":" ","pages":"120617"},"PeriodicalIF":7.7,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823483","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":"Volatile methylsiloxanes of 141 personal care products in Korea: An adult exposure assessment.","authors":"Berkay Yesildagli, Siyeon Joo, Nagyeong Hwang, Geonpyo Lee, Jun-Tae Kim, Jiwon Lee","doi":"10.1016/j.envres.2024.120633","DOIUrl":"10.1016/j.envres.2024.120633","url":null,"abstract":"<p><p>The widespread use of personal care products (PCPs) and subsequent exposure to their volatile methylsiloxane (VMS) content are often overlooked worldwide. Moreover, regulatory measures addressing VMS levels are sparse, and research on VMS levels in PCPs is limited. Therefore in this study, 141 PCPs from Korea, one of the biggest PCP markets in the world, were extracted and analyzed for seven VMSs using gas chromatography-mass spectrometry. Overall, cyclic VMS (cVMS) compounds were found at higher concentrations than linear VMS (lVMS) compounds, accounting for more than 93% of the total VMS concentration. The highest VMS content in PCPs was observed for octamethylcyclotetrasiloxane (D4) and hexamethylcyclotrisiloxane (D3), at approximately 130,000 and 110,000 μg g^-1, respectively. Additionally, the total VMS (∑VMS) concentration were in the order of face > hair > body products. PCPs were classified as non-rinse or rinse products based on their retention time on the body of the consumer. Non-rinse body products had more than twelve times the ∑VMS content of rinse body products (341 and 26.8 μg g^-1). Rinse hair products are three times the ∑VMS content of non-rinse hair products (576 and 191 μg g^-1). Furthermore, the principal component analysis suggested that PCPs can be grouped according to their cVMS content, with D3 and decamethylcyclopenatsiloxane (D5), D4, and D5 co-occurring. Notably, daily dermal exposure to VMSs in PCPs was largely determined by the retention time of the PCP on the body, followed by the VMS concentration. Although exposures to cVMS compounds were generally higher, exposure to the lVMS content of some PCPs was higher depending on the product type. Therefore, it is crucial to consider the significance of all VMS compounds, not solely cVMS, in exposure calculation and regulations. This study provides a database for regulatory bodies to implement in their exposure and toxicity studies.</p>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":" ","pages":"120633"},"PeriodicalIF":7.7,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826936","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":"Temporal shifts in the phosphate mobilising bacterial community reveal contrasting succession patterns in response to different phosphorus sources.","authors":"Zengwei Feng, Hong Gao, Ling Ding, Yongqiang Qin, Yang Zhou, Guangda Feng, Qing Yao, Honghui Zhu","doi":"10.1016/j.envres.2024.120599","DOIUrl":"10.1016/j.envres.2024.120599","url":null,"abstract":"<p><strong>Background: </strong>Phosphate mobilising bacteria (PMB), such as phoD- and pqqC-harbouring bacteria, play a crucial role in mobilising insoluble phosphorus (P) in soil through the secretion of alkaline phosphatase and organic acids.</p><p><strong>Objectives: </strong>To evaluate the succession pattern of PMB communities in response to different insoluble P sources.</p><p><strong>Methods: </strong>Five P source treatments, including the addition of KH₂PO₄ (PDP), FePO₄ (FEP), Ca₃(PO₄)₂ (TCP), lecithin (LEC), and a negative control, were established in the soil in a microcosmic system. Subsequently, phoD- and pqqC-harbouring bacterial communities were investigated by sequential sampling and high-throughput sequencing. In addition, PMB strains were isolated from these five treatments, and their phosphate mobilising activity was further analysed.</p><p><strong>Results: </strong>The effect of the insoluble organic P source (LEC) on the succession of PMB communities consistently exceeded that of insoluble inorganic P (Pi) sources (FEP and TCP). A successively enhanced succession and a successively diminishing succession were observed in PMB communities in FEP and TCP, respectively. Furthermore, the soil AP content significantly increased with incubation time in LEC and FEP. Most of the variation in phoD- and pqqC-harbouring bacterial communities was explained by all P fractions, respectively, while Fe-P and stable organic P fractions determined the PMB communities. Insoluble Pi sources, particularly FEP, tended to enrich more high-performance PMB strains for Fe-P.</p><p><strong>Conclusion: </strong>This study firstly reveals the dynamic response of PMB communities to different insoluble P sources at the community level in a short time scale and identifies key PMB taxa that respond to different insoluble P sources, particularly Fe-P. It is also the first to provide community evidence and a feasible method for obtaining high-performance PMB strains for Fe-P in subtropical acidic red soils through directed enrichment culture.</p>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":" ","pages":"120599"},"PeriodicalIF":7.7,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142821577","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 the adsorption of ammonia nitrogen by biochar in water bodies using machine learning strategies: model optimization and analysis of key characteristic variables.","authors":"Guixian Xie, Chi Zhu, Chen Li, Zhiping Fan, Bo Wang","doi":"10.1016/j.envres.2024.120618","DOIUrl":"https://doi.org/10.1016/j.envres.2024.120618","url":null,"abstract":"<p><p>Biochar adsorption technology has been widely used to remove ammonia nitrogen from water bodies. However, existing methods for predicting adsorption efficiency often lack sufficient accuracy and practical usability. This study evaluated eight machine learning models, including XGB, LR, KNN, DT, RF, GBR, SVR, and ANN, to predict the adsorption efficiency of ammonia nitrogen. The evaluation utilized a dataset comprising 770 instances of ammonia nitrogen adsorption by biochar. The models' prediction performances were systematically compared, and cross-validation was applied to enhance their generalization ability, leading to the selection of the best-performing model. The selected model's parameters were further optimized using Bayesian optimization to improve the prediction accuracy. The Bayesian-optimized XGB model achieved the highest predictive performance, with a coefficient of determination (R²) of 0.978. The R² values of the other models ranged from 0.556 (LR) to 0.927 (RF). Key factors influencing ammonia nitrogen adsorption efficiency were identified using SHAP analysis. These factors included the amount of biochar, adsorption time, initial ammonia nitrogen concentration, solution pH, pyrolysis time, and O%. Their optimal ranges were further determined through partial dependency plots. This study developed a reliable machine learning tool for accurately predicting ammonia nitrogen adsorption efficiency. Additionally, it provided insights into optimizing the preparation processes and adsorption conditions of biochar, contributing to its practical application in treating ammonia nitrogen pollution in water bodies.</p>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":" ","pages":"120618"},"PeriodicalIF":7.7,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142833294","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 EFFECTS OF RAIN AND DROUGHT ON INCIDENCE OF ENTERIC DISEASE IN PENNSYLVANIA (2010 - 2019).","authors":"Miriam Wamsley, Robin Taylor Wilson, Heather M Murphy","doi":"10.1016/j.envres.2024.120641","DOIUrl":"https://doi.org/10.1016/j.envres.2024.120641","url":null,"abstract":"<p><strong>Background: </strong>Campylobacter, nontyphoidal Salmonella, Cryptosporidium, and Giardia cause an estimated 1 million cases of domestically acquired waterborne diseases annually in the United States. Acute symptoms can include diarrhea and vomiting; however, these illnesses can result in longer term complications such as reactive arthritis, Guillan Barré syndrome and death, particularly in immunocompromised individuals. Precipitation and drought can plausibly increase the risk of enteric infections, but consensus in the literature is lacking.</p><p><strong>Objectives: </strong>To determine the effects of rain and drought on weekly counts of reportable enteric illness (due to Salmonella, Campylobacter, Giardia, or Cryptosporidium) in Pennsylvania, US between 2010-2019.</p><p><strong>Methods: </strong>We obtained 10-years of data on confirmed illness from 66 Pennsylvania counties due to: Salmonella (9,924), Campylobacter (15,854), Giardia (4,537), and Cryptosporidium (4,017). A zero-inflated negative binomial model with random-intercept for county was used to assess the relationship between illnesses caused by these pathogens between 2010-2019, and weekly rain (cm) and Palmer Drought Severity Index (PDSI) values from the National Weather Service. The lag times that were tested, between illness and weather event, were chosen by calculating the cross correlation between the statewide average weekly rain and the statewide number of weekly cases.</p><p><strong>Results: </strong>A positive association was found between rain and counts of campylobacteriosis, salmonellosis, and giardiasis. An increase in prior wetness (PDSI value) was associated with increased incidence rates of cryptosporidiosis and campylobacteriosis. The relationship between rain and PDSI and illness varied by organism type.</p><p><strong>Discussion: </strong>Complex relationships exist between enteric disease and precipitation and prior environmental wetness. Our findings suggest that rainfall may be contributing to increased waterborne exposure. Further investigation is needed to explore these relationships with factors such as drinking water source, local geological conditions, presence of combined sewer overflows and agricultural activities, recreational water use and irrigation water sources to better elucidate important waterborne transmission pathways.</p>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":" ","pages":"120641"},"PeriodicalIF":7.7,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142833297","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":"Maternal concentrations of perfluoroalkyl sulfonates and alterations in white matter microstructure in the developing brains of young children.","authors":"Gillian England-Mason, Anthony J F Reardon, Jess E Reynolds, Melody N Grohs, Amy M MacDonald, David W Kinniburgh, Jonathan W Martin, Catherine Lebel, Deborah Dewey","doi":"10.1016/j.envres.2024.120638","DOIUrl":"https://doi.org/10.1016/j.envres.2024.120638","url":null,"abstract":"<p><strong>Background: </strong>Maternal exposure to per- and polyfluoroalkyl substances (PFAS) has been linked to child neurodevelopmental difficulties. Neuroimaging research has linked these neurodevelopmental difficulties to white matter microstructure alterations, but the effects of PFAS on children's white matter microstructure remains unclear. We investigated associations between maternal blood concentrations of six common perfluoroalkyl sulfonates and white matter alterations in young children using longitudinal neuroimaging data.</p><p><strong>Methods: </strong>This study included 84 maternal-child pairs from a Canadian pregnancy cohort. Maternal second trimester blood concentrations of perfluorohexanesulfonate (PFHxS) and five perfluorooctane sulfonate (PFOS) isomers were quantified. Children underwent magnetic resonance imaging scans between ages two and six (279 scans total). Adjusted linear mixed models investigated associations between each exposure and white matter fractional anisotropy (FA) and mean diffusivity (MD).</p><p><strong>Results: </strong>Higher maternal concentrations of perfluoroalkyl sulfonates were associated with higher MD and lower FA in the body and splenium of the corpus callosum of young children. Multiple sex-specific associations were found. In males, PFHxS was negatively associated with FA in the superior longitudinal fasciculus, while PFOS isomers were positively associated with MD in the inferior longitudinal fasciculus (ILF). In females, PFOS isomers were positively associated with FA in the pyramidal fibers and MD in the fornix, but negatively associated with MD in the ILF.</p><p><strong>Conclusion: </strong>Maternal exposure to perfluoroalkyl sulfonates may alter sex-specific white matter development in young children, potentially contributing to neurodevelopmental difficulties. Larger studies are needed to replicate these findings and examine the neurotoxicity of these chemicals.</p>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":" ","pages":"120638"},"PeriodicalIF":7.7,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142833477","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":"Utilizing municipal solid waste incineration fly ash for mine goaf filling: Preparation, optimization, and heavy metal leaching study.","authors":"Lijuan Su, Siyao Wu, Feng Yu, Wancheng Zhu, Xiangdong Zhang, Bing Liang","doi":"10.1016/j.envres.2024.120594","DOIUrl":"10.1016/j.envres.2024.120594","url":null,"abstract":"<p><p>Municipal solid waste incineration fly ash (MSWI FA) contains many harmful substances, such as heavy metals, which pose a great threat to the ecological environment. Its proper disposal is an urgent environmental problem that needs to be addressed. The large number of goaf areas in China's mines provides a new approach for MSWI FA treatment. Scientifically processed MSWI FA can be used for goaf filling; this reduces the stockpile of MSWI FA and improves the safety of mine goaf areas. In this study, paste backfill was prepared using MSWI FA and slag as cementitious materials and coal gangue as aggregates under the composite excitation of sodium hydroxide and water glass. The optimal mix ratio was determined using response surface methodology, and the leaching trend of the heavy metal ions inside the material and the micro mechanism of strength formation were studied. Molecular dynamics simulations were used to further examine the leaching pathways of the heavy metal ions. The experimental research showed that the optimal mix proportions of the backfill were 81.65%, 3.67% and 52.27% for the mass concentration, aggregate-to-cement ratio and fine gangue ratio, respectively. The main polymerization products were C-(A)-S-H and N-A-S-H silicate gel, and small amounts of ettringite (AFt), calcium aluminate chloride (3CaO • Al₂O₃ • 3CaCl₂ • 30H₂O) and CaCO₃ were generated. Through Materials Studio (MS) software, the leaching pathway of the heavy metal ions in the backfill and the adsorption performance between the ions were examined, and the influence of the C-A-S-H gel on the leaching rates of the heavy metal ions of Pb²⁺, Cr³⁺, and Cd²⁺ was explored. The leaching rate was ranked as Pb²⁺>Cr³⁺>Cd²⁺. In this study, a pollution-free and structurally stable mine paste backfill material was prepared using MSWI FA solid waste.</p>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":" ","pages":"120594"},"PeriodicalIF":7.7,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826933","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}