Pub Date : 2025-02-01DOI: 10.1016/j.envres.2024.120487
Xu Duan , Jian Yang , Jiaqing Zhu , Hongbin Li , Yujie Fang , Runxue Liu , Chen Yang , Weizao Liu , Chunlian Ding , Qingcai Liu , Jiangling Li , Shan Ren
To alleviate situation caused by azo dyestuff and antibiotics, a series of CdS/sulfur doped carbon nitride (GCNS) S-scheme heterojunction photocatalysts have been successfully fabricated by a pretty facile solid-state diffusion (SSD) method,. Under visible light, the optimal sample called CdS/GCNS-1:2 presented the best photodegradation rate of nearly 100% over methyl orange (MO), of which the reaction constant k was about 9.67 and 5.39 times higher than that of pure GCNS and CdS, respectively. Degradation rate of 91% over tetracycline hydrochloride (TCH) was achieved within 60 min as well. The DFT calculations, XPS and charge flow tracking tests clarified the surge of C-S linkages and the construction of interfacial S-scheme heterojunction. The former promoted the fixation and conversion of adsorbed oxygen, while the latter accelerated the separation/transport of charge carriers. These tuning eventually collaborates on the promotion of •O2− reactive species, which confirmed as the predominant role of photoreaction. Furthermore, the plausible degradation pathways of MO/TCH and photocatalytic optimization mechanism were thoroughly elucidated.
{"title":"Activated CdS/ sulfur doped g-C3N4 photocatalyst for dye and antibiotic degradation: Experimental and DFT verification of S-scheme heterojunction","authors":"Xu Duan , Jian Yang , Jiaqing Zhu , Hongbin Li , Yujie Fang , Runxue Liu , Chen Yang , Weizao Liu , Chunlian Ding , Qingcai Liu , Jiangling Li , Shan Ren","doi":"10.1016/j.envres.2024.120487","DOIUrl":"10.1016/j.envres.2024.120487","url":null,"abstract":"<div><div>To alleviate situation caused by azo dyestuff and antibiotics, a series of CdS/sulfur doped carbon nitride (GCNS) S-scheme heterojunction photocatalysts have been successfully fabricated by a pretty facile solid-state diffusion (SSD) method,. Under visible light, the optimal sample called CdS/GCNS-1:2 presented the best photodegradation rate of nearly 100% over methyl orange (MO), of which the reaction constant <em>k</em> was about 9.67 and 5.39 times higher than that of pure GCNS and CdS, respectively. Degradation rate of 91% over tetracycline hydrochloride (TCH) was achieved within 60 min as well. The DFT calculations, XPS and charge flow tracking tests clarified the surge of C-S linkages and the construction of interfacial S-scheme heterojunction. The former promoted the fixation and conversion of adsorbed oxygen, while the latter accelerated the separation/transport of charge carriers. These tuning eventually collaborates on the promotion of •O<sub>2</sub><sup>−</sup> reactive species, which confirmed as the predominant role of photoreaction. Furthermore, the plausible degradation pathways of MO/TCH and photocatalytic optimization mechanism were thoroughly elucidated.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"266 ","pages":"Article 120487"},"PeriodicalIF":7.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142765143","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}
Pub Date : 2025-02-01DOI: 10.1016/j.envres.2024.120497
Yuan Liu, Rui Li, Weiguang Cai, Qiqi Liu
With the continuous increase in municipal solid waste (MSW) generation, greenhouse gas (GHG) emissions caused by MSW treatment have gradually become an important environmental concern. This study developed a comprehensive ten-factor analysis framework using the generalized Divisia index method (GDIM) to decompose the driving factors of GHG emissions from MSW sectors in China and its 31 provinces from 2010 to 2022, including population, economy, consumption, and waste generation. The heterogeneity of factor contributions was discussed from both temporal and spatial perspectives to propose mitigation strategies for provincial MSW sectors. The results indicated the following: (1) GHG emissions from the MSW sector increased from 2010 to 2019, followed by a 20.7% decrease from 2019 to 2022 due to the COVID-19 pandemic. Regionally, emissions were greater in the eastern provinces than in the central and western provinces. (2) The main positive contributors to the increase in GHG emissions were the consumption expenditure of urban households (HCE, 27.61 MtCO2e) and GDP (25.71 MtCO2e). GHG emissions per HCE (−27.31 MtCO2e) and GHG emissions per GDP (−25.45 MtCO2e) were the main factors for emission reduction. (3) The contributions of ten driving factors to each province varied significantly across different periods, with the negative effect of emission reduction factors increasing under the impact of the pandemic. The findings of this study can support policymakers in developing differentiated mitigation strategies at the provincial level to promote the sustainable transformation of waste management in China.
{"title":"Greenhouse gas emissions and mitigation strategies in China's municipal solid waste sector under the impact of the COVID-19 pandemic","authors":"Yuan Liu, Rui Li, Weiguang Cai, Qiqi Liu","doi":"10.1016/j.envres.2024.120497","DOIUrl":"10.1016/j.envres.2024.120497","url":null,"abstract":"<div><div>With the continuous increase in municipal solid waste (MSW) generation, greenhouse gas (GHG) emissions caused by MSW treatment have gradually become an important environmental concern. This study developed a comprehensive ten-factor analysis framework using the generalized Divisia index method (GDIM) to decompose the driving factors of GHG emissions from MSW sectors in China and its 31 provinces from 2010 to 2022, including population, economy, consumption, and waste generation. The heterogeneity of factor contributions was discussed from both temporal and spatial perspectives to propose mitigation strategies for provincial MSW sectors. The results indicated the following: (1) GHG emissions from the MSW sector increased from 2010 to 2019, followed by a 20.7% decrease from 2019 to 2022 due to the COVID-19 pandemic. Regionally, emissions were greater in the eastern provinces than in the central and western provinces. (2) The main positive contributors to the increase in GHG emissions were the consumption expenditure of urban households (HCE, 27.61 MtCO<sub>2</sub>e) and GDP (25.71 MtCO<sub>2</sub>e). GHG emissions per HCE (−27.31 MtCO<sub>2</sub>e) and GHG emissions per GDP (−25.45 MtCO<sub>2</sub>e) were the main factors for emission reduction. (3) The contributions of ten driving factors to each province varied significantly across different periods, with the negative effect of emission reduction factors increasing under the impact of the pandemic. The findings of this study can support policymakers in developing differentiated mitigation strategies at the provincial level to promote the sustainable transformation of waste management in China.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"266 ","pages":"Article 120497"},"PeriodicalIF":7.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142783588","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}
Pub Date : 2025-02-01DOI: 10.1016/j.envres.2024.120590
Wang-Qing Tang , Tuan-Tuan Wang , Jiang-Wei Miao , Hua-Dong Tan , Hong-Jin Zhang , Tuan-Qi Guo , Zhong-Bing Chen , Chun-Yuan Wu , Ling Mo , Bi-Xian Mai , Sai Wang
Per- and polyfluoroalkyl substances (PFASs) have attracted considerable attention because of their toxicity, persistence and bioaccumulation potential. With the construction of the Hainan Free Trade Port and the rapid development of economy, environmental pollution on Hainan Island is becoming increasingly prominent. PFASs have been detected in the seawater and sediments of mangrove ecosystems on Hainan Island. As the receiving water of wastewater treatment plants (WWTPs) and industrial wastewater, rivers are inevitably contaminated by PFASs. However, few studies have focused on PFAS pollution in three large rivers (the Nandu, Changhua, and Wanquan rivers) on Hainan Island. In the present study, the pollution status, potential sources, and ecological risks of PFASs in these three major rivers were explored. Perfluorobutanonic acid (PFBA) (48.7%) was found to be the major PFASs in the surface waters, and perfluoroundecanoic acid (PFUnDA) (19.7%) was the major PFASs in the sediments of the three major rivers. The concentrations of ∑PFASs in the upper-midstream region were low due to minimal human influence and increased in the middle-lower reaches with increasing industrial activity and urbanization, whereas decreased at downstream sites near estuaries where river water was diluted with seawater. WWTP effluent, industrial wastewater discharge, the application and discharge of aqueous fire-fighting foam, storm runoff and landfill leachate were the major sources of PFASs in the three major rivers. In surface water, perfluorooctanoic acid (PFOA), perfluorooctane sulfonamide (PFOSA) and perfluorooctadecanoic acid (PFODA) posed low-moderate risks at 5.71–85.6% of the sampling sites. PFASs in the sediment posed no ecological risk. This study provides key data regarding the pollution status and potential sources of PFASs in large rivers on subtropical islands.
{"title":"Presence and sources of per- and polyfluoroalkyl substances (PFASs) in the three major rivers on Hainan Island","authors":"Wang-Qing Tang , Tuan-Tuan Wang , Jiang-Wei Miao , Hua-Dong Tan , Hong-Jin Zhang , Tuan-Qi Guo , Zhong-Bing Chen , Chun-Yuan Wu , Ling Mo , Bi-Xian Mai , Sai Wang","doi":"10.1016/j.envres.2024.120590","DOIUrl":"10.1016/j.envres.2024.120590","url":null,"abstract":"<div><div>Per- and polyfluoroalkyl substances (PFASs) have attracted considerable attention because of their toxicity, persistence and bioaccumulation potential. With the construction of the Hainan Free Trade Port and the rapid development of economy, environmental pollution on Hainan Island is becoming increasingly prominent. PFASs have been detected in the seawater and sediments of mangrove ecosystems on Hainan Island. As the receiving water of wastewater treatment plants (WWTPs) and industrial wastewater, rivers are inevitably contaminated by PFASs. However, few studies have focused on PFAS pollution in three large rivers (the Nandu, Changhua, and Wanquan rivers) on Hainan Island. In the present study, the pollution status, potential sources, and ecological risks of PFASs in these three major rivers were explored. Perfluorobutanonic acid (PFBA) (48.7%) was found to be the major PFASs in the surface waters, and perfluoroundecanoic acid (PFUnDA) (19.7%) was the major PFASs in the sediments of the three major rivers. The concentrations of ∑PFASs in the upper-midstream region were low due to minimal human influence and increased in the middle-lower reaches with increasing industrial activity and urbanization, whereas decreased at downstream sites near estuaries where river water was diluted with seawater. WWTP effluent, industrial wastewater discharge, the application and discharge of aqueous fire-fighting foam, storm runoff and landfill leachate were the major sources of PFASs in the three major rivers. In surface water, perfluorooctanoic acid (PFOA), perfluorooctane sulfonamide (PFOSA) and perfluorooctadecanoic acid (PFODA) posed low-moderate risks at 5.71–85.6% of the sampling sites. PFASs in the sediment posed no ecological risk. This study provides key data regarding the pollution status and potential sources of PFASs in large rivers on subtropical islands.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"266 ","pages":"Article 120590"},"PeriodicalIF":7.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826929","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}
Pub Date : 2025-02-01DOI: 10.1016/j.envres.2024.120474
Shanshan Wu , Deliang Yin , Tianrong He , Guangjun Luo , Qing Xie , Pan Wu , Xian Zhou
Straw return-to-field releases substantial dissolved organic matter (DOM), which can interact with clay minerals and influence mercury (Hg) dynamics in soil-plant systems. However, its detailed mechanisms remain poorly understood. In this study, DOM-montmorillonite (DOM-M) complexes were synthesized using DOM extracted from composted rice straw (DOMrice) and rape straw (DOMrape). The objective of this study was to investigate their impacts on Hg methylation in soil and the accumulation of total Hg (THg) and methylmercury (MeHg) in vegetables. The results demonstrated that straw-derived DOM significantly increased MeHg levels in the soil and water spinach. However, humified straw-derived DOM effectively suppressed this elevation by 29.0–64.5%. Specifically, humified DOMrice resulted in lower MeHg concentrations in the soil and reduced THg and MeHg levels in water spinach compared to humified DOMrape. Natural montmorillonite reduced Hg methylation in the soil but increased the accumulation of THg and MeHg in water spinach. In contrast, the humified DOMrape-M complex significantly mitigated the MeHg accumulation in water spinach that was enhanced by montmorillonite, with a reduction percentage of 25.8–52.0%, while the humified DOMrice-M complex did not demonstrate a similar advantage. This discrepancy could be attributed to certain molecular components in DOMrape, such as higher thiol-rich protein-like fractions and oxidized S species, which could promote Hg retention within mineral layers. The reduced adsorption capacity of humified DOMrice-M for Hg2+ also emphasized the unique role of humified DOMrape-M. Overall, this study highlights the importance of humified straw-derived DOM and its interaction with soil minerals in shaping Hg dynamics within the plant-soil system.
{"title":"Regulation of straw-derived DOM and clay mineral complexation on mercury accumulation in vegetables","authors":"Shanshan Wu , Deliang Yin , Tianrong He , Guangjun Luo , Qing Xie , Pan Wu , Xian Zhou","doi":"10.1016/j.envres.2024.120474","DOIUrl":"10.1016/j.envres.2024.120474","url":null,"abstract":"<div><div>Straw return-to-field releases substantial dissolved organic matter (DOM), which can interact with clay minerals and influence mercury (Hg) dynamics in soil-plant systems. However, its detailed mechanisms remain poorly understood. In this study, DOM-montmorillonite (DOM-M) complexes were synthesized using DOM extracted from composted rice straw (DOM<sub>rice</sub>) and rape straw (DOM<sub>rape</sub>). The objective of this study was to investigate their impacts on Hg methylation in soil and the accumulation of total Hg (THg) and methylmercury (MeHg) in vegetables. The results demonstrated that straw-derived DOM significantly increased MeHg levels in the soil and water spinach. However, humified straw-derived DOM effectively suppressed this elevation by 29.0–64.5%. Specifically, humified DOM<sub>rice</sub> resulted in lower MeHg concentrations in the soil and reduced THg and MeHg levels in water spinach compared to humified DOM<sub>rape</sub>. Natural montmorillonite reduced Hg methylation in the soil but increased the accumulation of THg and MeHg in water spinach. In contrast, the humified DOM<sub>rape</sub>-M complex significantly mitigated the MeHg accumulation in water spinach that was enhanced by montmorillonite, with a reduction percentage of 25.8–52.0%, while the humified DOM<sub>rice</sub>-M complex did not demonstrate a similar advantage. This discrepancy could be attributed to certain molecular components in DOM<sub>rape</sub>, such as higher thiol-rich protein-like fractions and oxidized S species, which could promote Hg retention within mineral layers. The reduced adsorption capacity of humified DOM<sub>rice</sub>-M for Hg<sup>2+</sup> also emphasized the unique role of humified DOM<sub>rape</sub>-M. Overall, this study highlights the importance of humified straw-derived DOM and its interaction with soil minerals in shaping Hg dynamics within the plant-soil system.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"266 ","pages":"Article 120474"},"PeriodicalIF":7.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142764755","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}
Pub Date : 2025-02-01DOI: 10.1016/j.envres.2024.120541
Qingmei Lin , Yonggui Gao , Yuewei Liu , Saijun Huang , Yang Su , Weidong Luo , Chunxiang Shi , Yin Yang , Hualiang Lin , Xi Su , Zilong Zhang
Introduction
Gestation is a critical period for fetal brain development, and extreme heat exposure during this stage may have adverse impact on neurodevelopment in children. However, current evidence is scarce.
Methods
We examined the associations between maternal exposure to heat wave during pregnancy and neurodevelopmental delay in young children in a birth cohort study of 67,453 child-mother pairs from Foshan, China. Specifically, temperature data (spatial resolution: 0.0625° × 0.0625°) were assigned to study participants based on residential addresses. Then, heat wave events were defined by combining the intensity (temperature thresholds: ≥90th, 92.5th or 95th percentile) and duration (number of consecutive days: 2, 3 or 4 days). Neurodevelopmental status was assessed using a five-domain scale by trained medical professionals. Logistic regression was used to investigate the associations between gestational heat wave exposure and neurodevelopmental delay in children.
Results
We found that exposure to heat wave during early and late pregnancy was associated with increased risks of neurodevelopmental delay in children. By contrast, the results for mid-pregnancy heat wave exposure were mixed. The observed associations remained stable in a group of sensitivity analyses.
Conclusions
Our study adds some suggestive evidence that prenatal exposure to heat wave may have detrimental impact on children's neurodevelopment. More investigations are needed to verify our findings.
{"title":"Heat wave exposure during pregnancy and neurodevelopmental delay in young children: A birth cohort study","authors":"Qingmei Lin , Yonggui Gao , Yuewei Liu , Saijun Huang , Yang Su , Weidong Luo , Chunxiang Shi , Yin Yang , Hualiang Lin , Xi Su , Zilong Zhang","doi":"10.1016/j.envres.2024.120541","DOIUrl":"10.1016/j.envres.2024.120541","url":null,"abstract":"<div><h3>Introduction</h3><div>Gestation is a critical period for fetal brain development, and extreme heat exposure during this stage may have adverse impact on neurodevelopment in children. However, current evidence is scarce.</div></div><div><h3>Methods</h3><div>We examined the associations between maternal exposure to heat wave during pregnancy and neurodevelopmental delay in young children in a birth cohort study of 67,453 child-mother pairs from Foshan, China. Specifically, temperature data (spatial resolution: 0.0625° × 0.0625°) were assigned to study participants based on residential addresses. Then, heat wave events were defined by combining the intensity (temperature thresholds: ≥90th, 92.5th or 95th percentile) and duration (number of consecutive days: 2, 3 or 4 days). Neurodevelopmental status was assessed using a five-domain scale by trained medical professionals. Logistic regression was used to investigate the associations between gestational heat wave exposure and neurodevelopmental delay in children.</div></div><div><h3>Results</h3><div>We found that exposure to heat wave during early and late pregnancy was associated with increased risks of neurodevelopmental delay in children. By contrast, the results for mid-pregnancy heat wave exposure were mixed. The observed associations remained stable in a group of sensitivity analyses.</div></div><div><h3>Conclusions</h3><div>Our study adds some suggestive evidence that prenatal exposure to heat wave may have detrimental impact on children's neurodevelopment. More investigations are needed to verify our findings.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"266 ","pages":"Article 120541"},"PeriodicalIF":7.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790704","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}
Pub Date : 2025-02-01DOI: 10.1016/j.envres.2024.120560
Jinjin Zhao , Licheng Peng , Xiangmeng Ma
The discharge of aquaculture wastewater, comprising nitrogen, phosphorus, heavy metals, and antibiotics from large-scale aquaculture, poses a significant threat to marine ecosystems and human health. Consequently, addressing the treatment of marine aquaculture wastewater is imperative. Conventional physicochemical treatment methods have various limitations, whereas microalgae-based biological treatment technologies have gained increasing attention in the field of water purification due to their ability to efficiently absorb organic matter from mariculture wastewater and convert CO₂ into biomass products. Microalgae offer potential for highly efficient and cost-effective mariculture wastewater treatment, with particularly noteworthy advancements in the application of combined microalgae technologies. This paper explores the research hotspots in this field through bibliometric analysis and systematically discusses the following aspects: (1) summarizing the current pollution status of mariculture wastewater, including the types and sources of pollutants in various forms of mariculture wastewater, treatment methods, and associated treatment efficiencies; (2) analyzing the factors contributing to the gradual replacement of single microalgae technology with combined microalgae technology, highlighting its synergistic effects, enhanced pollutant removal efficiencies, resource recovery potential, and alignment with sustainable development goals; (3) exploring the mechanisms of pollutant removal by combined microalgae technologies, focusing on their technical advantages in bacterial-algal coupling, immobilized microalgae systems, and microalgal biofilm technologies; (4) discussing the challenges faced by the three main categories of combined microalgae technologies and proposing future improvement strategies to further enhance their application effectiveness. In conclusion, this paper offers a detailed analysis of these emerging technologies, providing a forward-looking perspective on the future development of microalgae-based mariculture wastewater treatment solutions.
{"title":"Innovative microalgae technologies for mariculture wastewater treatment: Single and combined microalgae treatment mechanisms, challenges and future prospects","authors":"Jinjin Zhao , Licheng Peng , Xiangmeng Ma","doi":"10.1016/j.envres.2024.120560","DOIUrl":"10.1016/j.envres.2024.120560","url":null,"abstract":"<div><div>The discharge of aquaculture wastewater, comprising nitrogen, phosphorus, heavy metals, and antibiotics from large-scale aquaculture, poses a significant threat to marine ecosystems and human health. Consequently, addressing the treatment of marine aquaculture wastewater is imperative. Conventional physicochemical treatment methods have various limitations, whereas microalgae-based biological treatment technologies have gained increasing attention in the field of water purification due to their ability to efficiently absorb organic matter from mariculture wastewater and convert CO₂ into biomass products. Microalgae offer potential for highly efficient and cost-effective mariculture wastewater treatment, with particularly noteworthy advancements in the application of combined microalgae technologies. This paper explores the research hotspots in this field through bibliometric analysis and systematically discusses the following aspects: (1) summarizing the current pollution status of mariculture wastewater, including the types and sources of pollutants in various forms of mariculture wastewater, treatment methods, and associated treatment efficiencies; (2) analyzing the factors contributing to the gradual replacement of single microalgae technology with combined microalgae technology, highlighting its synergistic effects, enhanced pollutant removal efficiencies, resource recovery potential, and alignment with sustainable development goals; (3) exploring the mechanisms of pollutant removal by combined microalgae technologies, focusing on their technical advantages in bacterial-algal coupling, immobilized microalgae systems, and microalgal biofilm technologies; (4) discussing the challenges faced by the three main categories of combined microalgae technologies and proposing future improvement strategies to further enhance their application effectiveness. In conclusion, this paper offers a detailed analysis of these emerging technologies, providing a forward-looking perspective on the future development of microalgae-based mariculture wastewater treatment solutions.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"266 ","pages":"Article 120560"},"PeriodicalIF":7.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142793995","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}
Pub Date : 2025-02-01DOI: 10.1016/j.envres.2024.120577
Xianpeng Li , Jingjie Yang , Xuelin Shi , Zhirong Sun
To enhance the contaminant removal efficiency of the electro-Fenton (E-Fenton) process, a nitrogen and phosphorus co-doped graphite felt (NPGF) cathode was synthesized using an anodic oxidation technique. An ascorbic acid-coupled NPGF E-Fenton system was then established for the degradation of ciprofloxacin (CIP). The NPGF cathode featured abundant oxygen-containing functional groups (such as -COOH and -OH), which enhanced the selectivity of oxygen reduction and facilitated the formation of H2O2. The introduction of N and P doping disrupted the charge balance within the carbon framework, accelerating electron transfer. Together, the NPGF electrode and ascorbic acid enhanced the cycling of Fe3+/Fe2+ while preventing the formation of iron sludge. Under optimal conditions (ascorbic acid concentration of 0.3 mM, current density of 2.0 mA cm−2, pH of 3.0, aeration rate of 0.6 L min−1, and Fe2+ concentration of 0.2 mM), CIP was completely removed within 20 min. The NPGF electrode exhibited excellent stability, maintaining 95.35% CIP removal even after 8 cycles. Analysis revealed that singlet oxygen primarily mediated the degradation of CIP, with its concentration measured at 1.23 × 10−7 M. Density functional theory was used to analyze the characteristics and potential attack sites of CIP, enabling the proposal of plausible degradation pathways. Toxicity simulations and Escherichia coli growth inhibition experiments demonstrated a reduction in the toxicity of CIP and its intermediate products. This study offers a valuable reference for improving the efficiency of E-Fenton technology in antibiotic wastewater treatment.
为了提高电fenton （E-Fenton）工艺对污染物的去除效率，采用阳极氧化技术合成了氮磷共掺杂石墨毡（NPGF）阴极。建立了抗坏血酸偶联NPGF E-Fenton体系降解环丙沙星（CIP）。NPGF阴极具有丰富的含氧官能团（如-COOH和-OH），增强了氧还原的选择性，有利于H2O2的形成。N和P掺杂的引入破坏了碳骨架内的电荷平衡，加速了电子转移。NPGF电极和抗坏血酸共同促进了Fe3+/Fe2+的循环，同时防止了铁污泥的形成。在抗坏血酸浓度为0.3 mM，电流密度为2.0 mA cm-2， pH为3.0，曝气速率为0.6 L min-1， Fe2+浓度为0.2 mM的最佳条件下，CIP在20 min内被完全去除。NPGF电极表现出优异的稳定性，即使在8次循环后仍保持95.35%的CIP去除率。分析表明，单重态氧主要介导了CIP的降解，其浓度为1.23 × 10-7 m，利用密度泛函理论分析了CIP的特征和潜在攻击部位，提出了合理的降解途径。毒性模拟和大肠杆菌生长抑制实验表明，CIP及其中间产物的毒性降低。本研究为提高E-Fenton技术在抗生素废水处理中的效率提供了有价值的参考。
{"title":"N, P co-doped graphite felt cathode for efficient removal of ciprofloxacin in an ascorbic acid-coupled electro-Fenton process: Simultaneously enhancing H2O2 generation and Fe3+/Fe2+ cycling","authors":"Xianpeng Li , Jingjie Yang , Xuelin Shi , Zhirong Sun","doi":"10.1016/j.envres.2024.120577","DOIUrl":"10.1016/j.envres.2024.120577","url":null,"abstract":"<div><div>To enhance the contaminant removal efficiency of the electro-Fenton (E-Fenton) process, a nitrogen and phosphorus co-doped graphite felt (NPGF) cathode was synthesized using an anodic oxidation technique. An ascorbic acid-coupled NPGF E-Fenton system was then established for the degradation of ciprofloxacin (CIP). The NPGF cathode featured abundant oxygen-containing functional groups (such as -COOH and -OH), which enhanced the selectivity of oxygen reduction and facilitated the formation of H<sub>2</sub>O<sub>2</sub>. The introduction of N and P doping disrupted the charge balance within the carbon framework, accelerating electron transfer. Together, the NPGF electrode and ascorbic acid enhanced the cycling of Fe<sup>3+</sup>/Fe<sup>2+</sup> while preventing the formation of iron sludge. Under optimal conditions (ascorbic acid concentration of 0.3 mM, current density of 2.0 mA cm<sup>−2</sup>, pH of 3.0, aeration rate of 0.6 L min<sup>−1</sup>, and Fe<sup>2+</sup> concentration of 0.2 mM), CIP was completely removed within 20 min. The NPGF electrode exhibited excellent stability, maintaining 95.35% CIP removal even after 8 cycles. Analysis revealed that singlet oxygen primarily mediated the degradation of CIP, with its concentration measured at 1.23 × 10<sup>−7</sup> M. Density functional theory was used to analyze the characteristics and potential attack sites of CIP, enabling the proposal of plausible degradation pathways. Toxicity simulations and Escherichia coli growth inhibition experiments demonstrated a reduction in the toxicity of CIP and its intermediate products. This study offers a valuable reference for improving the efficiency of E-Fenton technology in antibiotic wastewater treatment.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"266 ","pages":"Article 120577"},"PeriodicalIF":7.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798937","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}
Pub Date : 2025-02-01DOI: 10.1016/j.envres.2024.120582
Jin Qian , Sai Bai , Mengqi Geng , Dandan Zhang , Guoping Xiang , Yichu Zhang , Yangju Li , Dongdong Chu , Di Wu , Rui Ma , Yueping Bao , Xiangning Xu , Haoran Dong , Shouliang Yi
Cadmium sulfide is widely employed in environmental catalysis due to its excellent catalytic behaviors. However, the inherent toxicity and leaching risk of CdS-based catalyst presents significant challenges for practical applications. This study explored the incorporation of CdS nanowires on the nitrogen-doped multi-wall carbon tubes (N-MWCNTs) substrate to minimize the leaching rate and mitigate the bio-toxicity by regulating the electron transfer process. The low bio-toxicity of CdS/NMWCNT was confirmed by s series of toxicity tests. Additionally, the catalytic performance could be further enhanced with the high conductivity under the interfacial inner-electronic field. Results showed that the TC (20 mg/L) removal efficiency reached 90.31% within 30 min by PMS activation. Moreover, the PMS activation process, unveiled by In-situ Raman, quenching tests, and EPR spectra, demonstrated the improved TC removal efficiency was ascribed to the dominated roles of •OH, SO4•- and O2•-. DFT calculations further conducted the “NMWCNT-CdS-PMS” electron transfer pathway, thus effective activating PMS and protecting the CdS from oxidation. The findings provide a theoretical basis for designing and synthesizing unstable metal catalysts for the removal of emerging organic contaminants from wastewater with PMS activation.
{"title":"Construction of low-toxicity cadmium sulfide/nitrogen-doped muti-walled carbon nanotubes for peroxymonosulfate activation: The crucial role of electron transfer","authors":"Jin Qian , Sai Bai , Mengqi Geng , Dandan Zhang , Guoping Xiang , Yichu Zhang , Yangju Li , Dongdong Chu , Di Wu , Rui Ma , Yueping Bao , Xiangning Xu , Haoran Dong , Shouliang Yi","doi":"10.1016/j.envres.2024.120582","DOIUrl":"10.1016/j.envres.2024.120582","url":null,"abstract":"<div><div>Cadmium sulfide is widely employed in environmental catalysis due to its excellent catalytic behaviors. However, the inherent toxicity and leaching risk of CdS-based catalyst presents significant challenges for practical applications. This study explored the incorporation of CdS nanowires on the nitrogen-doped multi-wall carbon tubes (N-MWCNTs) substrate to minimize the leaching rate and mitigate the bio-toxicity by regulating the electron transfer process. The low bio-toxicity of CdS/NMWCNT was confirmed by s series of toxicity tests. Additionally, the catalytic performance could be further enhanced with the high conductivity under the interfacial inner-electronic field. Results showed that the TC (20 mg/L) removal efficiency reached 90.31% within 30 min by PMS activation. Moreover, the PMS activation process, unveiled by In-situ Raman, quenching tests, and EPR spectra, demonstrated the improved TC removal efficiency was ascribed to the dominated roles of •OH, SO<sub>4</sub><sup>•-</sup> and O<sub>2</sub><sup>•-</sup>. DFT calculations further conducted the “NMWCNT-CdS-PMS” electron transfer pathway, thus effective activating PMS and protecting the CdS from oxidation. The findings provide a theoretical basis for designing and synthesizing unstable metal catalysts for the removal of emerging organic contaminants from wastewater with PMS activation.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"266 ","pages":"Article 120582"},"PeriodicalIF":7.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142811462","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}
Pub Date : 2025-02-01DOI: 10.1016/j.envres.2024.120591
Yili Xie , Xiujuan Yuan , Shichen Liu , Sili Ren , Wuhui Luo
The coadsorption of anionic and cationic pollutants on adsorbents holds considerable importance in the development of relevant removal technologies and the understanding of pollutant transport in complex environmental media. Herein, tungsten (W), an emerging contaminant, and nickel (Ni) were chosen as two differently charged inorganic pollutants to investigate their removal characteristics on a magnesium-aluminum layered double hydroxide (LDH) prepared via microwave radiation. In the single systems, the amount of adsorbed W on LDH was initially increased and then decreased with increasing initial W concentration. In concentrated W solutions, LDH dissolution was intensified, accompanied by the intercalation and polymerization of W in the interlayer space. Among the various oxyanions, phosphate showed the most substantial inhibition on W uptake. In contrast, uptake of Ni was enhanced with the rapider adsorption rate at higher concentrations, due to the isomorphic substitution and precipitation. Coexisting cations of similar sizes competed with Ni to substitute with Mg, resulting in reduced uptake, except in the case of Fe3+ which disintegrated the LDH structure. In a binary system, the uptakes of W and Ni increased by 2.65 and 1.80 times, respectively, compared to their corresponding single systems, indicating an intriguing synergistic effect. Furthermore, the presence of Ni restored the LDH's ability to remove W in the presence of coexisting H2PO4−, SO42−, and CrO42−. However, due to the presence of W, the coexisting Co2+ and Zn2+ inhibited Ni uptake more significantly. The crystallinity decrease of LDH was induced and identified as the cause of the uptake synergy between W and Ni. These findings provide valuable insights for the development of efficient multifunctional adsorbents and enhance our understanding of the transfer dynamics of W in the presence of coexisting substances.
{"title":"Synergistic effect of W(VI) and Ni(II) uptakes on an MgAl-layered double hydroxide","authors":"Yili Xie , Xiujuan Yuan , Shichen Liu , Sili Ren , Wuhui Luo","doi":"10.1016/j.envres.2024.120591","DOIUrl":"10.1016/j.envres.2024.120591","url":null,"abstract":"<div><div>The coadsorption of anionic and cationic pollutants on adsorbents holds considerable importance in the development of relevant removal technologies and the understanding of pollutant transport in complex environmental media. Herein, tungsten (W), an emerging contaminant, and nickel (Ni) were chosen as two differently charged inorganic pollutants to investigate their removal characteristics on a magnesium-aluminum layered double hydroxide (LDH) prepared via microwave radiation. In the single systems, the amount of adsorbed W on LDH was initially increased and then decreased with increasing initial W concentration. In concentrated W solutions, LDH dissolution was intensified, accompanied by the intercalation and polymerization of W in the interlayer space. Among the various oxyanions, phosphate showed the most substantial inhibition on W uptake. In contrast, uptake of Ni was enhanced with the rapider adsorption rate at higher concentrations, due to the isomorphic substitution and precipitation. Coexisting cations of similar sizes competed with Ni to substitute with Mg, resulting in reduced uptake, except in the case of Fe<sup>3+</sup> which disintegrated the LDH structure. In a binary system, the uptakes of W and Ni increased by 2.65 and 1.80 times, respectively, compared to their corresponding single systems, indicating an intriguing synergistic effect. Furthermore, the presence of Ni restored the LDH's ability to remove W in the presence of coexisting H<sub>2</sub>PO<sub>4</sub><sup>−</sup>, SO<sub>4</sub><sup>2−</sup>, and CrO<sub>4</sub><sup>2−</sup>. However, due to the presence of W, the coexisting Co<sup>2+</sup> and Zn<sup>2+</sup> inhibited Ni uptake more significantly. The crystallinity decrease of LDH was induced and identified as the cause of the uptake synergy between W and Ni. These findings provide valuable insights for the development of efficient multifunctional adsorbents and enhance our understanding of the transfer dynamics of W in the presence of coexisting substances.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"266 ","pages":"Article 120591"},"PeriodicalIF":7.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142811492","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}
Pub Date : 2025-02-01DOI: 10.1016/j.envres.2024.120603
Shunli Hu , Peicheng Lu , Youhui Feng , Anqi Chen , Guomin Han
Coumarin, a synthetic chemical and phytotoxin, exhibits hepatotoxicity and carcinogenicity, posing threats to both human health and environmental safety. Microbial degradation effectively mitigates environmental contamination. In this study, a coumarin-degrading bacterial consortium designated as XDS-7 with Pseudomonas as the key degrader was obtained. However, there is a lack of comprehensive perspective on the key role of the genus Pseudomonas involved in coumarin degradation. We employed the consortium XDS-7 as a model system to investigate the critical role of the genus Pseudomonas involved in coumarin degradation. Metagenomic binning analysis indicated that bin 14 (Pseudomonas sp.) contains the full complement of genes required for coumarin degradation. A coumarin-degrading bacterium, Pseudomonas sp. strain X4, was isolated from consortium XDS-7 using a traditional enrichment method supplemented with chloramphenicol. Genomic analysis demonstrated that strain X4 carries a suite of genes to completely degrade coumarin. Bioinformatics analysis revealed that putative coumarin-degrading bacteria are widely distributed across diverse bacteria of the genus Pseudomonas. In addition, strain X4 completely removed 100 mg kg−1 of coumarin from contaminated soil within 48 h and 100 mg L−1 of coumarin from contaminated wastewater within 4 h. This study will greatly enhance our understanding and utilization of these valuable bioresources.
{"title":"Elucidating the role of the genus Pseudomonas involved in coumarin degradation","authors":"Shunli Hu , Peicheng Lu , Youhui Feng , Anqi Chen , Guomin Han","doi":"10.1016/j.envres.2024.120603","DOIUrl":"10.1016/j.envres.2024.120603","url":null,"abstract":"<div><div>Coumarin, a synthetic chemical and phytotoxin, exhibits hepatotoxicity and carcinogenicity, posing threats to both human health and environmental safety. Microbial degradation effectively mitigates environmental contamination. In this study, a coumarin-degrading bacterial consortium designated as XDS-7 with <em>Pseudomonas</em> as the key degrader was obtained. However, there is a lack of comprehensive perspective on the key role of the genus <em>Pseudomonas</em> involved in coumarin degradation. We employed the consortium XDS-7 as a model system to investigate the critical role of the genus <em>Pseudomonas</em> involved in coumarin degradation. Metagenomic binning analysis indicated that bin 14 (<em>Pseudomonas</em> sp.) contains the full complement of genes required for coumarin degradation. A coumarin-degrading bacterium, <em>Pseudomonas</em> sp. strain X4, was isolated from consortium XDS-7 using a traditional enrichment method supplemented with chloramphenicol. Genomic analysis demonstrated that strain X4 carries a suite of genes to completely degrade coumarin. Bioinformatics analysis revealed that putative coumarin-degrading bacteria are widely distributed across diverse bacteria of the genus <em>Pseudomonas</em>. In addition, strain X4 completely removed 100 mg kg<sup>−1</sup> of coumarin from contaminated soil within 48 h and 100 mg L<sup>−1</sup> of coumarin from contaminated wastewater within 4 h. This study will greatly enhance our understanding and utilization of these valuable bioresources.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"266 ","pages":"Article 120603"},"PeriodicalIF":7.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142816804","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}
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