Concerns of quaternary ammonium compounds (QACs) and microplastics (MPs) as emerging containments accumulating in wastewater treatment plants (WWTPs) have attracted much attention. Plastisphere with distinctive microbial communities might also be the repository for pathogens and resistance genes (RGs). Thus, the effects of three representative QACs with different concentrations on biofilm and plastisphere were studied in sulfur autotrophic denitrification (SAD) system. Over 100 days, 1-5 mg/L QACs exerted few impacts on system stability, whereas 15 mg/L QACs seriously lowered the microbial activity and the inhibitory effects ranked: benzylalkyldimethylethyl ammonium compound > dialkyldimethyl ammonium compound > alkyltrimethyl ammonium compound. Dosing of QACs in SAD system not only altered the microbial community structure and assembly, but also induced higher levels of intracellular RGs and extracellular RGs in plastisphere than in biofilm. Although the free RGs abundances in water slightly lowered, they might also pose great ecological risks. Pathogens identified as the potential hosts of RGs were more prone to colocalizing in plastisphere. Mobile genetic elements directly contributed to the three-fraction RGs transmission in SAD system. This study offered new insights into the differential responses of biofilm and plastisphere under QAC stress and guided for the disinfectants and MPs pollution containment in WWTPs.
{"title":"Unignorable environmental risks: Insight into differential responses between biofilm and plastisphere in sulfur autotrophic denitrification system upon exposure to quaternary ammonium compounds","authors":"Yuxuan Wang, Jingfeng Gao, Zhiqi Wang, Yifan Zhao, Hanyi Wang, Yi Guo, Yukun Yuan, Hao Chen","doi":"10.1016/j.jhazmat.2025.137231","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.137231","url":null,"abstract":"Concerns of quaternary ammonium compounds (QACs) and microplastics (MPs) as emerging containments accumulating in wastewater treatment plants (WWTPs) have attracted much attention. Plastisphere with distinctive microbial communities might also be the repository for pathogens and resistance genes (RGs). Thus, the effects of three representative QACs with different concentrations on biofilm and plastisphere were studied in sulfur autotrophic denitrification (SAD) system. Over 100 days, 1-5<!-- --> <!-- -->mg/L QACs exerted few impacts on system stability, whereas 15<!-- --> <!-- -->mg/L QACs seriously lowered the microbial activity and the inhibitory effects ranked: benzylalkyldimethylethyl ammonium compound > dialkyldimethyl ammonium compound > alkyltrimethyl ammonium compound. Dosing of QACs in SAD system not only altered the microbial community structure and assembly, but also induced higher levels of intracellular RGs and extracellular RGs in plastisphere than in biofilm. Although the free RGs abundances in water slightly lowered, they might also pose great ecological risks. Pathogens identified as the potential hosts of RGs were more prone to colocalizing in plastisphere. Mobile genetic elements directly contributed to the three-fraction RGs transmission in SAD system. This study offered new insights into the differential responses of biofilm and plastisphere under QAC stress and guided for the disinfectants and MPs pollution containment in WWTPs.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"18 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142981637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-15DOI: 10.1016/j.jhazmat.2025.137229
Shupeng Sun, Xinlei Li, Yanhui Sun, Nan Wang, Baoyu Huang, Xiaogan Li
Tellurium nanotubes (TeNT) heterojunction with Tellurium oxide (TeO2) were prepared by in situ oxidation at elevated temperatures in air. The chemiresistive type NO2 sensor was then fabricated by depositing the synthesized TeNT/TeO2 on the integrated gold electrodes. The response of the TeNT/TeO2 based sensor to 600 ppb NO2 was 38.8%, which was about 3.2 times higher than that of the single-phase TeNT based sensor (12.1%). The response and recovery time are 39 s and 49 s, respectively, which are substantially reduced compared to those of the pristine TeNT based sensor (133 s and 336 s) and the results reported in literature. The sensor also exhibits good stability with a response deviation of less than 2% for 45 days and a good resistance to environmental disturbances. The improved sensor performance can be attributed to the heterojunction formed between TeNT and TeO2. Density Functional Theory (DFT) calculations show that the formed TeNT/TeO2 heterojunction enhances the adsorption energy (-0.671 eV) and charge transfer (0.49 |e|) between NO2 and the TeNT/TeO2.
{"title":"Fabrication of TeNT/TeO2 heterojunction based sensor for ultrasensitive detection of NO2","authors":"Shupeng Sun, Xinlei Li, Yanhui Sun, Nan Wang, Baoyu Huang, Xiaogan Li","doi":"10.1016/j.jhazmat.2025.137229","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.137229","url":null,"abstract":"Tellurium nanotubes (TeNT) heterojunction with Tellurium oxide (TeO<sub>2</sub>) were prepared by in situ oxidation at elevated temperatures in air. The chemiresistive type NO<sub>2</sub> sensor was then fabricated by depositing the synthesized TeNT/TeO<sub>2</sub> on the integrated gold electrodes. The response of the TeNT/TeO<sub>2</sub> based sensor to 600 ppb NO<sub>2</sub> was 38.8%, which was about 3.2 times higher than that of the single-phase TeNT based sensor (12.1%). The response and recovery time are 39<!-- --> <!-- -->s and 49<!-- --> <!-- -->s, respectively, which are substantially reduced compared to those of the pristine TeNT based sensor (133<!-- --> <!-- -->s and 336<!-- --> <!-- -->s) and the results reported in literature. The sensor also exhibits good stability with a response deviation of less than 2% for 45 days and a good resistance to environmental disturbances. The improved sensor performance can be attributed to the heterojunction formed between TeNT and TeO<sub>2</sub>. Density Functional Theory (DFT) calculations show that the formed TeNT/TeO<sub>2</sub> heterojunction enhances the adsorption energy (-0.671<!-- --> <!-- -->eV) and charge transfer (0.49 |e|) between NO<sub>2</sub> and the TeNT/TeO<sub>2</sub>.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"24 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142981638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-15DOI: 10.1016/j.jhazmat.2025.137251
Xiaoxia Zhang, Hong Zhang
Section snippets
Data avail ability
No data was used for the research described in the article.
Funding
None declared.
CRediT authorship contribution statement
Xiaoxia Zhang: Writing – original draft. Hong Zhang: Writing – review & editing.
Declaration of competing interest
The authors declare that they have no conflict of interest.
Declaration of Competing Interest
The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Reports a relationship with that includes:. Has patent pending to. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
{"title":"Concerns over investigating the effect of air pollutants on disease risk utilizing Mendelian randomization","authors":"Xiaoxia Zhang, Hong Zhang","doi":"10.1016/j.jhazmat.2025.137251","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.137251","url":null,"abstract":"<h2>Section snippets</h2><section><section><h2>Data avail ability</h2>No data was used for the research described in the article.</section></section><section><section><h2>Funding</h2>None declared.</section></section><section><section><h2>CRediT authorship contribution statement</h2><strong>Xiaoxia Zhang:</strong> Writing – original draft. <strong>Hong Zhang:</strong> Writing – review & editing.</section></section><section><section><h2>Declaration of competing interest</h2>The authors declare that they have no conflict of interest.</section></section><section><section><h2>Declaration of Competing Interest</h2>The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Reports a relationship with that includes:. Has patent pending to. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.</section></section>","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"37 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142986922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-15DOI: 10.1016/j.jhazmat.2025.137238
Dugin Kaown, Kenneth C. Carroll, Jürgen Mahlknecht, Ye Ji Kim, Jun-Young Shin, Seong-Sun Lee, Kang-Kun Lee
Chlorinated ethenes are prevalent contaminants in industrial wastewater that detrimentally affect human health. As elevated tetrachloroethene (PCE) concentrations (18.0–18.7 mg/L) have been observed in the groundwater of an industrial area near the ocean in Incheon, South Korea, effective remedies are required to degrade these contaminants. However, the effects of saline–fresh water mixing on microbial biodegradation and contaminant attenuation are not well known. To characterize the groundwater contamination and in situ biodegradation during salt water intrusion mixing dynamics, compound-specific isotope analysis (CSIA) data combined with hydrogeochemical and microbial data were employed to delineate the contaminant sources and the degradation processes of chlorinated ethenes in groundwater near the sea. The presence of degradation by-products indicated the occurrence of biodegradation. The highest PCE concentration (18.7 mg/L) and the most depleted δ13C (–28.7‰) and δ37Cl (–1.2‰) in PCE were observed in groundwater at well NDMW-13, revealing a potential source of contamination. Slightly enriched δ13C (–26.2 to –25.0‰) in PCE compared with that of source zone (–28.7 to –26.0‰) and organohalide-respiring bacteria (OHRB), as well as chlorinated ethene degraders, were observed in other wells (NDMW-9, NDMW-10, NDMW-11, and NDMW-12), providing confirmatory evidence for the biodegradation of chlorinated ethenes. The CSIA and microbial data results indicate only a minor amount of natural attenuation in the source zone area. Chlorinated ethenes in the plume boundary zone are close to the sea and affected by saline–fresh water mixing; therefore, the microbial community structures slightly differ from those in the source zone. This study suggests that CSIA and microbial and groundwater age data are useful for evaluating the effects of the mixing dynamics of saline water intrusion and heavy rainfall infiltration on the dechlorination of chlorinated ethenes in groundwater.
{"title":"Influence of saline water and heavy rain on the fate of chlorinated ethenes in groundwater characterized by compound-specific isotope and microbial data","authors":"Dugin Kaown, Kenneth C. Carroll, Jürgen Mahlknecht, Ye Ji Kim, Jun-Young Shin, Seong-Sun Lee, Kang-Kun Lee","doi":"10.1016/j.jhazmat.2025.137238","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.137238","url":null,"abstract":"Chlorinated ethenes are prevalent contaminants in industrial wastewater that detrimentally affect human health. As elevated tetrachloroethene (PCE) concentrations (18.0–18.7<!-- --> <!-- -->mg/L) have been observed in the groundwater of an industrial area near the ocean in Incheon, South Korea, effective remedies are required to degrade these contaminants. However, the effects of saline–fresh water mixing on microbial biodegradation and contaminant attenuation are not well known. To characterize the groundwater contamination and in situ biodegradation during salt water intrusion mixing dynamics, compound-specific isotope analysis (CSIA) data combined with hydrogeochemical and microbial data were employed to delineate the contaminant sources and the degradation processes of chlorinated ethenes in groundwater near the sea. The presence of degradation by-products indicated the occurrence of biodegradation. The highest PCE concentration (18.7<!-- --> <!-- -->mg/L) and the most depleted δ<sup>13</sup>C (–28.7‰) and δ<sup>37</sup>Cl (–1.2‰) in PCE were observed in groundwater at well NDMW-13, revealing a potential source of contamination. Slightly enriched δ<sup>13</sup>C (–26.2 to –25.0‰) in PCE compared with that of source zone (–28.7 to –26.0‰) and organohalide-respiring bacteria (OHRB), as well as chlorinated ethene degraders, were observed in other wells (NDMW-9, NDMW-10, NDMW-11, and NDMW-12), providing confirmatory evidence for the biodegradation of chlorinated ethenes. The CSIA and microbial data results indicate only a minor amount of natural attenuation in the source zone area. Chlorinated ethenes in the plume boundary zone are close to the sea and affected by saline–fresh water mixing; therefore, the microbial community structures slightly differ from those in the source zone. This study suggests that CSIA and microbial and groundwater age data are useful for evaluating the effects of the mixing dynamics of saline water intrusion and heavy rainfall infiltration on the dechlorination of chlorinated ethenes in groundwater.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"8 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142981591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Risk assessment of potential toxic elements (PTEs), microplastics (MPs) and microorganisms in groundwater around landfills is critical. Waste from landfills seeps into groundwater contaminating water quality, threatening groundwater safety, and negatively affecting the ecosystem. This study explored spatial and temporal changes in PTEs, MPs, and microorganisms in the groundwater around a closed landfill. The results showed that Mn and Cr were the most predominant PTEs in the groundwater, average Mn and Cr concentrations in June being 1.16 and 4.51 times higher than in November, respectively. The Risk assessment of PTEs in groundwater Mn was heavily contaminated, Cr was moderately contaminated. The abundance of MPs the average value of MPs in June was 1.55 times higher than that in November; the MPs indicated that groundwater is more heavily contaminated, especially in the downstream areas. The Proteobacteria is the main phylum, and PLS-PM, PTEs were positively correlated with the phylum of microorganisms, negatively correlated with the genus of microorganisms and the abundance of MPs. This study emphasizes the importance of environmental management of landfills, provide new insights into the monitoring and identification of groundwater contamination as well as scientific guidance on appropriate remediation strategies for leachate-contaminated groundwater.
{"title":"Risk assessment of potentially toxic elements, microplastics, and microorganisms in groundwater around municipal solid waste landfill.","authors":"Xueya Li, Tianmu Peng, Linyi Lin, Muhammad Amjad Khan, Shurui Zhang, Meijuan Kuang, Jinming Lou, Jiaxin He, Pangxiang Zhang, Xiaomao Song, Xu Wang, Qing Huang","doi":"10.1016/j.jhazmat.2025.137240","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.137240","url":null,"abstract":"Risk assessment of potential toxic elements (PTEs), microplastics (MPs) and microorganisms in groundwater around landfills is critical. Waste from landfills seeps into groundwater contaminating water quality, threatening groundwater safety, and negatively affecting the ecosystem. This study explored spatial and temporal changes in PTEs, MPs, and microorganisms in the groundwater around a closed landfill. The results showed that Mn and Cr were the most predominant PTEs in the groundwater, average Mn and Cr concentrations in June being 1.16 and 4.51 times higher than in November, respectively. The Risk assessment of PTEs in groundwater Mn was heavily contaminated, Cr was moderately contaminated. The abundance of MPs the average value of MPs in June was 1.55 times higher than that in November; the MPs indicated that groundwater is more heavily contaminated, especially in the downstream areas. The Proteobacteria is the main phylum, and PLS-PM, PTEs were positively correlated with the phylum of microorganisms, negatively correlated with the genus of microorganisms and the abundance of MPs. This study emphasizes the importance of environmental management of landfills, provide new insights into the monitoring and identification of groundwater contamination as well as scientific guidance on appropriate remediation strategies for leachate-contaminated groundwater.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"17 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142981593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-15DOI: 10.1016/j.jhazmat.2025.137190
Zhexi Tian, Seung-Kyu Kim, Kitae Kim
Plastic additives' environmental impacts remain insufficiently understood due to knowledge gaps in their bioavailability, despite growing concerns from increased plastic use and waste. Additives that are non-covalently bound but strongly interact with polymers can be extractable but not leachable, thus non-bioavailable. Nevertheless, most studies have not distinguished between extractable (EC) and leachable content (LC) in plastic additives. We quantified the EC and LC of styrene oligomers (SOs) in polystyrene (PS) by applying the selective solvent compatibility of PS—dissolution in dichloromethane for EC and swelling in n-hexane for LC. Significant differences were found between EC and LC of SOs in 28 widely consumed PS products and across three PS types—expanded PS (EPS), extruded PS (XPS), and solid PS. EPS showed lower EC and LC values and fewer SO isomers. LCs were only 32% (EPS), 84% (XPS), and 72% (solid PS) of ECs, suggesting bioavailable fractions may be overestimated if only EC is considered. We estimate that 3.3 MT of PS-incorporated SOs, with 76% in leachable forms, have entered the environment, but much may still remain in PS debris. Distinct isomer ratios and high non-leachable fractions in EPS suggest that SOs could serve as effective tracers for distinguishing and quantifying invisible EPS-origin particles in beach sediments. This study underscores the need to differentiate EC from LC for environmentally realistic risk assessment and source identification.
{"title":"Distinguishing between Extractable and Leachable Contents of Styrene Oligomers in Various Polystyrene Consumer Products: Towards Environmentally Realistic Scenarios","authors":"Zhexi Tian, Seung-Kyu Kim, Kitae Kim","doi":"10.1016/j.jhazmat.2025.137190","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.137190","url":null,"abstract":"Plastic additives' environmental impacts remain insufficiently understood due to knowledge gaps in their bioavailability, despite growing concerns from increased plastic use and waste. Additives that are non-covalently bound but strongly interact with polymers can be extractable but not leachable, thus non-bioavailable. Nevertheless, most studies have not distinguished between extractable (EC) and leachable content (LC) in plastic additives. We quantified the EC and LC of styrene oligomers (SOs) in polystyrene (PS) by applying the selective solvent compatibility of PS—dissolution in dichloromethane for EC and swelling in <em>n</em>-hexane for LC. Significant differences were found between EC and LC of SOs in 28 widely consumed PS products and across three PS types—expanded PS (EPS), extruded PS (XPS), and solid PS. EPS showed lower EC and LC values and fewer SO isomers. LCs were only 32% (EPS), 84% (XPS), and 72% (solid PS) of ECs, suggesting bioavailable fractions may be overestimated if only EC is considered. We estimate that 3.3 MT of PS-incorporated SOs, with 76% in leachable forms, have entered the environment, but much may still remain in PS debris. Distinct isomer ratios and high non-leachable fractions in EPS suggest that SOs could serve as effective tracers for distinguishing and quantifying invisible EPS-origin particles in beach sediments. This study underscores the need to differentiate EC from LC for environmentally realistic risk assessment and source identification.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"29 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142986921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-15DOI: 10.1016/j.jhazmat.2025.137248
Gaurav Mishra, Manish Kumar, S.N. Tripathi, Manish Joshi, Sidyant Kumar, T. Saud, Sudha Chauhan, Arshad Khan, B.K. Sapra
Experiments were conducted in controlled laboratory conditions to determine the size-resolved CCN (Cloud Condensation Nuclei) activity of sub micrometer-sized aerosols containing hazardous nuclear fission products (CsI and CsOH) and abundant ambient inorganic aerosols ammonium sulphates ((NH4)2SO4), ammonium chloride (NH4Cl), sodium nitrate (NaNO3), and sodium chloride (NaCl). The presence of these atmospheric-relevant compounds internally mixed with fission product compounds has the potential to affect the capacity of ambient particulates of aerosols to absorb water and function as CCN. Once in the atmosphere, the dynamics of airborne radionuclides and subsequently their fate gets affected by dry and wet deposition processes. The interplay of source and decay terms determines the transit of radioactivity and impacts its local and/or global spread. After being exposed to a sufficiently humid atmosphere, released cesium particles have a high potential to act as CCN. However, the CCN properties of the resulting mixed particles may be altered due to their interaction with atmospheric particles. DMT-CCN counter was used to acquire CCN activation curves with initial dry particle size variation (20 to 300 nm) for mixed particles (ratio 1:1) at 0.1-1% supersaturation (SS). For a variety of particle sizes and mixtures of soluble materials, activation ratio curves were obtained under various SS conditions. From the study of CCN spectra, an estimate of the hygroscopicity parameter (κ) was made, which is sensitive to the chemical composition of aerosols. Under different SS conditions, the CCN activation diameters of mixed aerosols were found to be affected greatly in comparison to pure compounds. For the first time, the spectral efficiency of CCNs and the activation diameters of CsI and CsOH particles combined with important atmospheric aerosols were described at various SS levels. Terminal settling velocities for the mixed particles having a representative diameter as critical activation droplet diameter (wet diameter at particular SS), and varying effective density (based on droplet composition) were obtained and compared with the pure state of particles at different SS levels. The relative difference was significant for some combinations and SS conditions. Any modification in settling velocity ultimately impacts the particle’s lifetime and deposition flux estimations. Hence neglecting the presence of atmospheric salts affects the accuracy of the source term estimates for a postulated nuclear reactor accident scenario. Data on these features is crucial for modelling the behavior of these particles in simulations. In the extremely improbable event of a containment breach occurring under severe nuclear accident conditions, the outcome has the potential to enhance environmental source-term estimations.
{"title":"Interaction of cesium compounds with abundant inorganic compounds of atmosphere: Effect on cloud formation potential and settling","authors":"Gaurav Mishra, Manish Kumar, S.N. Tripathi, Manish Joshi, Sidyant Kumar, T. Saud, Sudha Chauhan, Arshad Khan, B.K. Sapra","doi":"10.1016/j.jhazmat.2025.137248","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.137248","url":null,"abstract":"Experiments were conducted in controlled laboratory conditions to determine the size-resolved CCN (Cloud Condensation Nuclei) activity of sub micrometer-sized aerosols containing hazardous nuclear fission products (CsI and CsOH) and abundant ambient inorganic aerosols ammonium sulphates ((NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub>), ammonium chloride (NH<sub>4</sub>Cl), sodium nitrate (NaNO<sub>3</sub>), and sodium chloride (NaCl). The presence of these atmospheric-relevant compounds internally mixed with fission product compounds has the potential to affect the capacity of ambient particulates of aerosols to absorb water and function as CCN. Once in the atmosphere, the dynamics of airborne radionuclides and subsequently their fate gets affected by dry and wet deposition processes. The interplay of source and decay terms determines the transit of radioactivity and impacts its local and/or global spread. After being exposed to a sufficiently humid atmosphere, released cesium particles have a high potential to act as CCN. However, the CCN properties of the resulting mixed particles may be altered due to their interaction with atmospheric particles. DMT-CCN counter was used to acquire CCN activation curves with initial dry particle size variation (20 to 300<!-- --> <!-- -->nm) for mixed particles (ratio 1:1) at 0.1-1% supersaturation (SS). For a variety of particle sizes and mixtures of soluble materials, activation ratio curves were obtained under various SS conditions. From the study of CCN spectra, an estimate of the hygroscopicity parameter (κ) was made, which is sensitive to the chemical composition of aerosols. Under different SS conditions, the CCN activation diameters of mixed aerosols were found to be affected greatly in comparison to pure compounds. For the first time, the spectral efficiency of CCNs and the activation diameters of CsI and CsOH particles combined with important atmospheric aerosols were described at various SS levels. Terminal settling velocities for the mixed particles having a representative diameter as critical activation droplet diameter (wet diameter at particular SS), and varying effective density (based on droplet composition) were obtained and compared with the pure state of particles at different SS levels. The relative difference was significant for some combinations and SS conditions. Any modification in settling velocity ultimately impacts the particle’s lifetime and deposition flux estimations. Hence neglecting the presence of atmospheric salts affects the accuracy of the source term estimates for a postulated nuclear reactor accident scenario. Data on these features is crucial for modelling the behavior of these particles in simulations. In the extremely improbable event of a containment breach occurring under severe nuclear accident conditions, the outcome has the potential to enhance environmental source-term estimations.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"37 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study focuses on developing an affordable and cost-effective colorimetric solid-state optical sensor for target-specific naked-eye detection of Pb2+, offering significant potential for real-time environmental monitoring and public health applications. The indigenously developed porous polymer monolithic template, poly(lauryl methacrylate-co-ethylene glycol dimethacrylate) (poly(LMC-co-EGDMA) is infused with a chromoionophoric probe, i.e., 6,6-(naphthalene-1,5-diyl bis(diazene-2,1-diyl)bis(4-(butan-2-yl)phenol) (NDBP) to develop a durable/reusable solid sensor. The perforated structural assemblies of the porous poly(LMC-co-EGDMA) are analyzed using a range of microscopic, spectroscopic, and diffraction methods. The template features a homogeneous configuration of interlinked macro/mesoporous networks, allowing for the enhanced integration of NDBP probe molecules to facilitate rapid and improved Pb2+ detection. The fabricated sensor demonstrates a significant solid-state colorimetric shift from pale peach to deep maroon in proportion to Pb2+ concentration, with a precise absorption peak at 543 nm. The operational parameters of the poly(LMC-co-EGDMA)NDBP sensor are optimized to maximize the ion-sensing ability. The sensor demonstrates a linear signal response from 0 to 300 ppb for Pb2+ and corresponding detection and quantification limits of 0.28 and 0.93 ppb, respectively. The sensing effectiveness of the sensor using cigarette samples and natural water samples reveals outstanding accuracy with recovery results of ≥98.9% (RSD ≤1.8%) and ≥99.1%, with RSD of ≤1.7% from quadruplicate analysis. The proposed solid-state sensor offers exceptional sensitivity and selectivity for trace Pb²⁺ detection with a rapid response time of 40 s. The cost-effective and portable sensor provides a valuable tool for environmental monitoring and public health protection by enabling fast, on-site detection of the toxic Pb2+ in contaminated water and tobacco samples, particularly for developing and underdeveloped regions with limited access to sophisticated instruments. Its reusability and accuracy features offer a sustainable and practical solution for addressing widespread lead pollution, thus contributing to safer water quality assessments and pollution control.
{"title":"Probe-infused polymer monolithic sensor for colorimetric detection of Pb2+ in environmental water samples and tobacco extracts","authors":"Sushmitha Pedugu Sivaraman, Prabhakaran Srinivasan, Deepan Kumar Madhu, Prabhakaran Deivasigamani, Akhila Maheswari Mohan","doi":"10.1016/j.jhazmat.2025.137247","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.137247","url":null,"abstract":"This study focuses on developing an affordable and cost-effective colorimetric solid-state optical sensor for target-specific naked-eye detection of Pb<sup>2+</sup>, offering significant potential for real-time environmental monitoring and public health applications. The indigenously developed porous polymer monolithic template, poly(lauryl methacrylate-co-ethylene glycol dimethacrylate) (poly(LMC-co-EGDMA) is infused with a chromoionophoric probe, i.e., 6,6-(naphthalene-1,5-diyl bis(diazene-2,1-diyl)bis(4-(butan-2-yl)phenol) (NDBP) to develop a durable/reusable solid sensor. The perforated structural assemblies of the porous poly(LMC-co-EGDMA) are analyzed using a range of microscopic, spectroscopic, and diffraction methods. The template features a homogeneous configuration of interlinked macro/mesoporous networks, allowing for the enhanced integration of NDBP probe molecules to facilitate rapid and improved Pb<sup>2+</sup> detection. The fabricated sensor demonstrates a significant solid-state colorimetric shift from pale peach to deep maroon in proportion to Pb<sup>2+</sup> concentration, with a precise absorption peak at 543<!-- --> <!-- -->nm. The operational parameters of the poly(LMC-co-EGDMA)NDBP sensor are optimized to maximize the ion-sensing ability. The sensor demonstrates a linear signal response from 0 to 300 ppb for Pb<sup>2+</sup> and corresponding detection and quantification limits of 0.28 and 0.93 ppb, respectively. The sensing effectiveness of the sensor using cigarette samples and natural water samples reveals outstanding accuracy with recovery results of ≥98.9% (RSD ≤1.8%) and ≥99.1%, with RSD of ≤1.7% from quadruplicate analysis. The proposed solid-state sensor offers exceptional sensitivity and selectivity for trace Pb²⁺ detection with a rapid response time of 40<!-- --> <!-- -->s. The cost-effective and portable sensor provides a valuable tool for environmental monitoring and public health protection by enabling fast, on-site detection of the toxic Pb<sup>2+</sup> in contaminated water and tobacco samples, particularly for developing and underdeveloped regions with limited access to sophisticated instruments. Its reusability and accuracy features offer a sustainable and practical solution for addressing widespread lead pollution, thus contributing to safer water quality assessments and pollution control.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"7 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142981636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-15DOI: 10.1016/j.jhazmat.2025.137242
Young Kyun Lim, Chung Hyeon Lee, Kyun-Woo Lee, Sang Hee Hong, Seung Ho Baek
Aggregation processes of microalgae have significant effects on the vertical distribution of microplastics (MPs) in the marine environment. This study explored how the harmful microalga Heterosigma akashiwo affects the aggregation and sinking characteristics of four types of MPs: low and high-density polyethylene (PE) spheres, and small and large polypropylene (PP) fragments. The aggregation of MPs was primarily driven by extracellular polymeric substances (EPS) rather than direct attachment to the cells, contributing to their sinking. The sinking of low-density PE spheres followed a logistic function, saturating at 28% with a half-saturation time of 9 days. In contrast, small PP fragments sank minimally (under 2%) and large PP fragments showed almost no sinking, indicating the varying impacts of MP density and size. The sinking velocity of the MP aggregates was significantly lower for low-density PE spheres (0.63 mm∙s-1) than for high-density PE spheres (0.81 mm∙s-1), despite no significant differences in aggregate size or MP particle number. This result may suggest that low-density MPs could potentially affect marine carbon cycle. Furthermore, no clear evidence was found for the resuspension of the settled aggregates due to bacterial decomposition under dark and cold conditions. As the first experimental study to explore the aggregation, sinking, and resuspension of different MPs in the presence of H. akashiwo, these findings, when integrated with field observations and modeling studies, provide valuable insights for predicting MP distribution in marine environments.
{"title":"Impact of Heterosigma akashiwo on the Environmental Behavior of Microplastics: Aggregation, Sinking, and Resuspension Dynamics","authors":"Young Kyun Lim, Chung Hyeon Lee, Kyun-Woo Lee, Sang Hee Hong, Seung Ho Baek","doi":"10.1016/j.jhazmat.2025.137242","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.137242","url":null,"abstract":"Aggregation processes of microalgae have significant effects on the vertical distribution of microplastics (MPs) in the marine environment. This study explored how the harmful microalga <em>Heterosigma akashiwo</em> affects the aggregation and sinking characteristics of four types of MPs: low and high-density polyethylene (PE) spheres, and small and large polypropylene (PP) fragments. The aggregation of MPs was primarily driven by extracellular polymeric substances (EPS) rather than direct attachment to the cells, contributing to their sinking. The sinking of low-density PE spheres followed a logistic function, saturating at 28% with a half-saturation time of 9 days. In contrast, small PP fragments sank minimally (under 2%) and large PP fragments showed almost no sinking, indicating the varying impacts of MP density and size. The sinking velocity of the MP aggregates was significantly lower for low-density PE spheres (0.63<!-- --> <!-- -->mm∙s<sup>-1</sup>) than for high-density PE spheres (0.81<!-- --> <!-- -->mm∙s<sup>-1</sup>), despite no significant differences in aggregate size or MP particle number. This result may suggest that low-density MPs could potentially affect marine carbon cycle. Furthermore, no clear evidence was found for the resuspension of the settled aggregates due to bacterial decomposition under dark and cold conditions. As the first experimental study to explore the aggregation, sinking, and resuspension of different MPs in the presence of <em>H. akashiwo</em>, these findings, when integrated with field observations and modeling studies, provide valuable insights for predicting MP distribution in marine environments.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"7 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142981594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-15DOI: 10.1016/j.jhazmat.2025.137244
Wenjing Li, Guiquan Che, Chunli Wang, Zhihao Zhang, Jing Zhang, Zhang Lin
The reactions at the mineral-solution interface govern whether heavy metals (HMs) ions are retained within minerals or migrate with the solution, thus influencing their cycling and fate. However, the mechanisms driving this differential behavior of HMs at the interface remain poorly understood. In this study, we present a novel paradigm for the selective retention of HMs ions at the mineral-solution interface. By confining the solution on the mineral surface to a defined volume, specifically thinning it down to a thickness of 50 nm, selective retention of Cd ions in the presence of coexisting Cu and Zn ions was achieved. The distribution coefficient of Cd in the mineral reaches as high as 41.44, significantly exceeding that of Cu at 0.13 and Zn at 0.07. Combined with DFT calculations, the results reveal that this selectivity arises from the regulation of the ion desolvation free energy by the solution nanofilm, precisely compensating the energy cost for Cd incorporation as an impurity into the mineral lattice. This work not only enriches the understanding of ion separation behavior at natural mineral-solution interfaces but also offers a new strategy for heavy metal separation and enrichment in industrial applications.
{"title":"Phase Transformation of Calcium Sulfate at Mineral-Solution Interface: An Overlooked Pathway for Selective Enrichment of Cadmium","authors":"Wenjing Li, Guiquan Che, Chunli Wang, Zhihao Zhang, Jing Zhang, Zhang Lin","doi":"10.1016/j.jhazmat.2025.137244","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.137244","url":null,"abstract":"The reactions at the mineral-solution interface govern whether heavy metals (HMs) ions are retained within minerals or migrate with the solution, thus influencing their cycling and fate. However, the mechanisms driving this differential behavior of HMs at the interface remain poorly understood. In this study, we present a novel paradigm for the selective retention of HMs ions at the mineral-solution interface. By confining the solution on the mineral surface to a defined volume, specifically thinning it down to a thickness of 50<!-- --> <!-- -->nm, selective retention of Cd ions in the presence of coexisting Cu and Zn ions was achieved. The distribution coefficient of Cd in the mineral reaches as high as 41.44, significantly exceeding that of Cu at 0.13 and Zn at 0.07. Combined with DFT calculations, the results reveal that this selectivity arises from the regulation of the ion desolvation free energy by the solution nanofilm, precisely compensating the energy cost for Cd incorporation as an impurity into the mineral lattice. This work not only enriches the understanding of ion separation behavior at natural mineral-solution interfaces but also offers a new strategy for heavy metal separation and enrichment in industrial applications.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"13 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142986923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}