Metastable β-Bi2O3 exhibits high catalytic performance due to its suitable band gap, greater dielectric permittivity and conductivity. However, the difficultly in preparing β-Bi2O3 and β-Bi2O3 based materials is still a problem to be overcome. In this work, porous Bi/β-Bi2O3@Carbon photocatalysts were prepared for the first time by using atmosphere switching strategy during the post-cooling of metal-organic framework (MOF) pyrolysis. The crystal phase structure and composition of Bi/β-Bi2O3@Carbon could be easily adjusted by simply switching cooling atmosphere from N2 to air when cooled to different temperatures. The photocatalytic activities of the material were evaluated by degradation of emerging pollutant Fluorescent whitening agents (FWA) 351 under simulated solar light irradiation. It was observed that 10 mg/L FWA 351 was completely degraded within 4 h using the optimal photocatalyst. The mineralization efficiency reached 60% in 6 h. Active species trapping experiments confirmed that hole oxidation was responsible for the degradation of FWA 351. The increased activity was due to the improved visible light utilization resulted from reduced bandgap of Bi/β-Bi2O3@Carbon and surface plasmon resonance effect of bismuth metal, as well as the facilitated interfacial electron migration and charge carrier separation through multi-interface transfer paths. The proposed strategy provides new ideas for designing and synthesizing functional materials. The efficient degradation and mineralization of FWA 351 by Bi/β-Bi2O3@Carbon also confirmed its potential for future application in wastewater treatment.
{"title":"A novel route to synthesize Bi/β-Bi2O3@Carbon: Mechanism and performance for efficient degradation of organic pollutants","authors":"Xia Zhang, Yifang Zhang, Xitong Yang, Jiaxin Han, Guifen Zhu, Jing Fan","doi":"10.1039/d4en00973h","DOIUrl":"https://doi.org/10.1039/d4en00973h","url":null,"abstract":"Metastable β-Bi<small><sub>2</sub></small>O<small><sub>3</sub></small> exhibits high catalytic performance due to its suitable band gap, greater dielectric permittivity and conductivity. However, the difficultly in preparing β-Bi<small><sub>2</sub></small>O<small><sub>3 </sub></small>and β-Bi<small><sub>2</sub></small>O<small><sub>3</sub></small> based materials is still a problem to be overcome. In this work, porous Bi/β-Bi<small><sub>2</sub></small>O<small><sub>3</sub></small>@Carbon photocatalysts were prepared for the first time by using atmosphere switching strategy during the post-cooling of metal-organic framework (MOF) pyrolysis. The crystal phase structure and composition of Bi/β-Bi<small><sub>2</sub></small>O<small><sub>3</sub></small>@Carbon could be easily adjusted by simply switching cooling atmosphere from N<small><sub>2</sub></small> to air when cooled to different temperatures. The photocatalytic activities of the material were evaluated by degradation of emerging pollutant Fluorescent whitening agents (FWA) 351 under simulated solar light irradiation. It was observed that 10 mg/L FWA 351 was completely degraded within 4 h using the optimal photocatalyst. The mineralization efficiency reached 60% in 6 h. Active species trapping experiments confirmed that hole oxidation was responsible for the degradation of FWA 351. The increased activity was due to the improved visible light utilization resulted from reduced bandgap of Bi/β-Bi<small><sub>2</sub></small>O<small><sub>3</sub></small>@Carbon and surface plasmon resonance effect of bismuth metal, as well as the facilitated interfacial electron migration and charge carrier separation through multi-interface transfer paths. The proposed strategy provides new ideas for designing and synthesizing functional materials. The efficient degradation and mineralization of FWA 351 by Bi/β-Bi<small><sub>2</sub></small>O<small><sub>3</sub></small>@Carbon also confirmed its potential for future application in wastewater treatment.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"19 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142849076","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}
Guru Karthikeyan Thirunavukkarasu, Monika Motlochová, Dmytro Bavol, Anna Vykydalová, Jaroslav Kupcik, Michal Navrátil, Kaplan Kirakci, Eva Pližingrová, Dana Dvoranová, Jan Subrt
Microplastic (MPs) pollution has become a serious environmental problem in the current decade. Unfortunately, wastewater treatment plants are not favorable for treating the MPs. Therefore, it is necessary to develop methodologies to treat the MPs in water efficiently. Photocatalytic (PC) and photo-Fenton (PF) processes are among the promising treatment methodologies that utilize reactive oxygen species (ROS) to degrade the MPs. In this study, TiO2 aerogel powders (TiAP) were prepared by lyophilization and subsequent annealing of peroxo-titanic acid gels, followed by modification with Fe at the surface for the PC/PF-based degradation of MPs. Fe-modification on TiAP boosts the PC activity and activates the PF-based process in the presence of H2O2. The degradation of polystyrene (PS) MPs was evaluated using an attenuated total reflection infrared (ATR-IR) spectroscopy, total organic carbon (TOC) analyzer, thermogravimetric analyzer coupled with differential scanning calorimetry and mass spectrometer (TGA-DSC/MS), nuclear magnetic resonance (NMR) spectroscopy, and high-performance liquid chromatography with a high-resolution mass spectrometer (HPLC-HRMS) techniques. Photo-induced degradation of the PS MPs was evaluated by monitoring the changes in the carbonyl/peroxyl index (CI/PI) recorded by ATR-IR spectroscopy and the mass loss measured by TGA-DSC/MS techniques. Interestingly, the samples with higher CI value changes affected the total mass residue, while samples with lower changes in the CI value did not alter the total mass residue after the photo-induced treatment. Further, NMR spectra confirmed the formation of new peaks due to the oxidative degradation of PS MPs, especially between 0.8 and 1.3 ppm. Additionally, by-products formed after the photo-induced treatment process analyzed by the HPLC-HRMS technique indicate the degradation of PS MPs. The indirect technique of electron paramagnetic resonance (EPR) spectroscopy revealed the ROS contributing to the oxidation of PS MPs during the PC and PF treatment process using Fe-modified TiAP. This study's findings have the potential to significantly influence future research and environmental policies by providing better insights into preparing efficient nanostructures for photo-induced degradation of MPs.
{"title":"Insights in Photocatalytic/Fenton-based Degradation of Microplastics using Iron-Modified Titanium Dioxide Aerogel Powders","authors":"Guru Karthikeyan Thirunavukkarasu, Monika Motlochová, Dmytro Bavol, Anna Vykydalová, Jaroslav Kupcik, Michal Navrátil, Kaplan Kirakci, Eva Pližingrová, Dana Dvoranová, Jan Subrt","doi":"10.1039/d4en00818a","DOIUrl":"https://doi.org/10.1039/d4en00818a","url":null,"abstract":"Microplastic (MPs) pollution has become a serious environmental problem in the current decade. Unfortunately, wastewater treatment plants are not favorable for treating the MPs. Therefore, it is necessary to develop methodologies to treat the MPs in water efficiently. Photocatalytic (PC) and photo-Fenton (PF) processes are among the promising treatment methodologies that utilize reactive oxygen species (ROS) to degrade the MPs. In this study, TiO2 aerogel powders (TiAP) were prepared by lyophilization and subsequent annealing of peroxo-titanic acid gels, followed by modification with Fe at the surface for the PC/PF-based degradation of MPs. Fe-modification on TiAP boosts the PC activity and activates the PF-based process in the presence of H2O2. The degradation of polystyrene (PS) MPs was evaluated using an attenuated total reflection infrared (ATR-IR) spectroscopy, total organic carbon (TOC) analyzer, thermogravimetric analyzer coupled with differential scanning calorimetry and mass spectrometer (TGA-DSC/MS), nuclear magnetic resonance (NMR) spectroscopy, and high-performance liquid chromatography with a high-resolution mass spectrometer (HPLC-HRMS) techniques. Photo-induced degradation of the PS MPs was evaluated by monitoring the changes in the carbonyl/peroxyl index (CI/PI) recorded by ATR-IR spectroscopy and the mass loss measured by TGA-DSC/MS techniques. Interestingly, the samples with higher CI value changes affected the total mass residue, while samples with lower changes in the CI value did not alter the total mass residue after the photo-induced treatment. Further, NMR spectra confirmed the formation of new peaks due to the oxidative degradation of PS MPs, especially between 0.8 and 1.3 ppm. Additionally, by-products formed after the photo-induced treatment process analyzed by the HPLC-HRMS technique indicate the degradation of PS MPs. The indirect technique of electron paramagnetic resonance (EPR) spectroscopy revealed the ROS contributing to the oxidation of PS MPs during the PC and PF treatment process using Fe-modified TiAP. This study's findings have the potential to significantly influence future research and environmental policies by providing better insights into preparing efficient nanostructures for photo-induced degradation of MPs.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"48 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142841575","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}
Aurélie Rosset, Isabelle Michaud-Soret, Isabelle Capron, Hugo Voisin, Gregory Brochard, Virginie Bergé, Anass Benayad, Arnaud Guiot, Simon Clavaguera, Sébastien Artous
The development of safe nanomaterials has become a significant concern in various industry sectors using advanced materials. While there is variability in the definitions of Safe(r) by Design (SbD), the general concept is to minimise environmental, health and safety concerns implementing appropriate measures at an early stage of product design to control exposure and hazard, thus reducing risks. The SbD product strategy applied in this paper refers to the mitigation of exposure by the identification of release scenarios during the use and the end of life of the nano-enabled products (NEPs) that include engineered nanomaterials (ENMs). This strategy was applied to the development of a photocatalytic mineral paint containing TiO2 engineered nanomaterial. This ENM was then incorporated into a mineral matrix-based paint for photocatalytic application. The different paint formulations were applied to standardised substrates and artificially weathered in an accelerated weathering chamber with controlled parameters. Mechanical solicitation that simulate end of life (EoL) of the paint, through abrasion tests, were performed to assess the potential emission of airborne particles that could lead to human or environmental exposure. The release evaluation confirms that paints with TiO2 nanoparticles without SbD coating release more nanometric particles due to strong matrix degradation. The TiO2 nanoparticles coated with PEG or grafted onto CNC does not completely prevent the degradation of the paint surface during ageing. However, this degradation does not necessarily lead to an increase in aerosol emission. The coating degradation during accelerated ageing limits the degradation of the paint matrix, preventing the release of unbound TiO2 nanoparticles. Understanding the mechanisms of release and how they are influenced by the ENMs, the matrix material and the process characteristics is crucial for the exposure and risk assessment approach in occupational settings involving engineered nanomaterials. Moreover, establishing release rates makes it possible to increase the reliability of SbD e-infrastructure for performance testing and the implementation of Safe-by-Design approaches in the nanotechnology supply chain.
{"title":"Towards the development of safer by design mineral photocatalytic paint: influence of the TiO2 modifications on particle release","authors":"Aurélie Rosset, Isabelle Michaud-Soret, Isabelle Capron, Hugo Voisin, Gregory Brochard, Virginie Bergé, Anass Benayad, Arnaud Guiot, Simon Clavaguera, Sébastien Artous","doi":"10.1039/d4en00681j","DOIUrl":"https://doi.org/10.1039/d4en00681j","url":null,"abstract":"The development of safe nanomaterials has become a significant concern in various industry sectors using advanced materials. While there is variability in the definitions of Safe(r) by Design (SbD), the general concept is to minimise environmental, health and safety concerns implementing appropriate measures at an early stage of product design to control exposure and hazard, thus reducing risks. The SbD product strategy applied in this paper refers to the mitigation of exposure by the identification of release scenarios during the use and the end of life of the nano-enabled products (NEPs) that include engineered nanomaterials (ENMs). This strategy was applied to the development of a photocatalytic mineral paint containing TiO2 engineered nanomaterial. This ENM was then incorporated into a mineral matrix-based paint for photocatalytic application. The different paint formulations were applied to standardised substrates and artificially weathered in an accelerated weathering chamber with controlled parameters. Mechanical solicitation that simulate end of life (EoL) of the paint, through abrasion tests, were performed to assess the potential emission of airborne particles that could lead to human or environmental exposure. The release evaluation confirms that paints with TiO2 nanoparticles without SbD coating release more nanometric particles due to strong matrix degradation. The TiO2 nanoparticles coated with PEG or grafted onto CNC does not completely prevent the degradation of the paint surface during ageing. However, this degradation does not necessarily lead to an increase in aerosol emission. The coating degradation during accelerated ageing limits the degradation of the paint matrix, preventing the release of unbound TiO2 nanoparticles. Understanding the mechanisms of release and how they are influenced by the ENMs, the matrix material and the process characteristics is crucial for the exposure and risk assessment approach in occupational settings involving engineered nanomaterials. Moreover, establishing release rates makes it possible to increase the reliability of SbD e-infrastructure for performance testing and the implementation of Safe-by-Design approaches in the nanotechnology supply chain.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"25 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142841576","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}
Graphene Oxide (GO) nano-sheets have emerged as a potent nanomaterial for a range of applications like antibacterial, antibiofilm. Besides, Microplastic are emerging as a chronic pollutant originated from the aggrandized usage of plastics, for possessing serious repercussions to the living beings and the environment. In concern of the issue, the individual toxicological impacts of GO nano-sheets and Polystyrene (PS) have received substantial research, the mechanistic details and toxicological effects of GO and PS as a hybrid is yet unknown. This study evaluates the in vivo biotoxicity of a lab mimic green synthesized GO@PS hybrid using embryonic zebrafish through experimental and computational approach. The physiochemical characterzation of the GO@PS verified the synthesis of a stable 1433.0 ± 268.0 nm sized GO@PS hybrid with a zeta potential of -47.3 ± 5.7 mV. Mechanistic analysis deduced the toxicological impact as a cause of induced apoptosis due to dysregulated oxidative stress lead by the hypoxic condition created due to blockage of chorion by attachment and accumulation of GO@PS. The study depicted the in vivo toxicity of GO, PS and GO@PS at cellular and molecular level to draw attention for taking measures in usage of GO and PS in terms of environmental and human health.
{"title":"Unravelling the in vivo biotoxicity of green-biofabricated Graphene Oxide-Microplastic hybrid mediated by proximal intrinsic atomic interaction","authors":"Adrija Sinha, Sudakshya S. Lenka, Abha Gupta, Dibyangshee Singh, Anmol Choudhury, Shaikh Sheeran Naser, Aishee Ghosh, Faizan Zarreen Simnani, Aditya Nandi, Suresh K Verma, Mrutyunjay Suar, Richa Mishra","doi":"10.1039/d4en00558a","DOIUrl":"https://doi.org/10.1039/d4en00558a","url":null,"abstract":"Graphene Oxide (GO) nano-sheets have emerged as a potent nanomaterial for a range of applications like antibacterial, antibiofilm. Besides, Microplastic are emerging as a chronic pollutant originated from the aggrandized usage of plastics, for possessing serious repercussions to the living beings and the environment. In concern of the issue, the individual toxicological impacts of GO nano-sheets and Polystyrene (PS) have received substantial research, the mechanistic details and toxicological effects of GO and PS as a hybrid is yet unknown. This study evaluates the in vivo biotoxicity of a lab mimic green synthesized GO@PS hybrid using embryonic zebrafish through experimental and computational approach. The physiochemical characterzation of the GO@PS verified the synthesis of a stable 1433.0 ± 268.0 nm sized GO@PS hybrid with a zeta potential of -47.3 ± 5.7 mV. Mechanistic analysis deduced the toxicological impact as a cause of induced apoptosis due to dysregulated oxidative stress lead by the hypoxic condition created due to blockage of chorion by attachment and accumulation of GO@PS. The study depicted the in vivo toxicity of GO, PS and GO@PS at cellular and molecular level to draw attention for taking measures in usage of GO and PS in terms of environmental and human health.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"52 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142841686","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}
Franklin Perez, Nesha Andoy, Uyan Tran Thao Hua, Keiko Yoshioka, Ruby May Arana Sullan
Positively charged nanoplastics are more toxic to microorganisms than their negatively charged counterparts, prompting further investigation into their antimicrobial properties. While many studies have shown that positively charged nanoplastics bind to bacteria, the fate of these nanoplastic coatings during bacterial growth remains unclear. Here, we report how amine-modified polystyrene nanoplastics (PS-NH2) reduce the viability of the plant growth-promoting rhizobacterium Bacillus subtilis and impair its ability to colonize plant roots. We found that upon exposure to PS-NH2, the nanoplastics form stable, multilayer coatings on the surface of the bacteria. In response, B. subtilis initiates processes to remove these nanoplastics—a behavior heavily influenced by their growth environment, whether at air or liquid interfaces. Consequently, we observed differential toxicity under varying growth conditions. Using tomato plant as a model system, we found that these nanoplastics severely inhibit bacterial attachment to plant roots. Our results demonstrate that nanoplastics can disrupt beneficial interactions between soil bacteria and plants, potentially compromising the effectiveness of microbial biofertilizers. Given that current practices introduce large amounts of plastics into agricultural areas, the adverse effects of nanoplastic pollution need to be mitigated
{"title":"Adaptive responses of Bacillus subtilis underlie differential nanoplastic toxicity with implications for root colonization","authors":"Franklin Perez, Nesha Andoy, Uyan Tran Thao Hua, Keiko Yoshioka, Ruby May Arana Sullan","doi":"10.1039/d4en00936c","DOIUrl":"https://doi.org/10.1039/d4en00936c","url":null,"abstract":"Positively charged nanoplastics are more toxic to microorganisms than their negatively charged counterparts, prompting further investigation into their antimicrobial properties. While many studies have shown that positively charged nanoplastics bind to bacteria, the fate of these nanoplastic coatings during bacterial growth remains unclear. Here, we report how amine-modified polystyrene nanoplastics (PS-NH<small><sub>2</sub></small>) reduce the viability of the plant growth-promoting rhizobacterium <em>Bacillus subtilis</em> and impair its ability to colonize plant roots. We found that upon exposure to PS-NH<small><sub>2</sub></small>, the nanoplastics form stable, multilayer coatings on the surface of the bacteria. In response,<em> B. subtilis</em> initiates processes to remove these nanoplastics—a behavior heavily influenced by their growth environment, whether at air or liquid interfaces. Consequently, we observed differential toxicity under varying growth conditions. Using tomato plant as a model system, we found that these nanoplastics severely inhibit bacterial attachment to plant roots. Our results demonstrate that nanoplastics can disrupt beneficial interactions between soil bacteria and plants, potentially compromising the effectiveness of microbial biofertilizers. Given that current practices introduce large amounts of plastics into agricultural areas, the adverse effects of nanoplastic pollution need to be mitigated","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"3 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832043","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}
Manish Kumar, Sumit Choudhary, Satinder K. Sharma, Jaspreet Kaur Randhawa
The potential of piezoelectric polymer materials to harness minute-scale kinetic energy has garnered significant scientific interest. Their superior flexibility, ease of processing, and ability to conform to large areas and curved surfaces set them apart from inorganic materials. In this study, we developed a flexible, light-sensitive piezoelectric nano generator (PENG) using electrospun hybrid nanofibers composed of polyacrylonitrile (PAN) and α-Fe2O3. Through piezo response force microscopy (PFM), we characterized the piezoelectric properties of these nanofibers, noting a significant enhancement in the piezoelectric coefficient (d33). We further investigated the application of three distinct nanostructured materials across three catalytic scenarios: piezoelectric, pyro catalytic, and photocatalytic. Our primary focus was on renewable energy generation and environmental remediation, particularly targeting the removal of organic pollutants. Our methods achieved an impressive removal efficiency of up to 95% for methylene blue (MB) dye. Additionally, we demonstrated the efficacy of integrating magnetic nanoparticles into electrospun nanofibers to improve the adsorption of heavy metals, specifically lead and copper contaminants. This research provides a comprehensive examination of nanomaterial-based energy harvesting systems, utilizing ferroelectric, sonocatalytic, and photocatalytic approaches.
{"title":"Piezoelectric nanogenerators with hybrid nanofibers: a dual approach for energy generation and wastewater treatment","authors":"Manish Kumar, Sumit Choudhary, Satinder K. Sharma, Jaspreet Kaur Randhawa","doi":"10.1039/d4en00568f","DOIUrl":"https://doi.org/10.1039/d4en00568f","url":null,"abstract":"The potential of piezoelectric polymer materials to harness minute-scale kinetic energy has garnered significant scientific interest. Their superior flexibility, ease of processing, and ability to conform to large areas and curved surfaces set them apart from inorganic materials. In this study, we developed a flexible, light-sensitive piezoelectric nano generator (PENG) using electrospun hybrid nanofibers composed of polyacrylonitrile (PAN) and α-Fe<small><sub>2</sub></small>O<small><sub>3</sub></small>. Through piezo response force microscopy (PFM), we characterized the piezoelectric properties of these nanofibers, noting a significant enhancement in the piezoelectric coefficient (<em>d</em><small><sub>33</sub></small>). We further investigated the application of three distinct nanostructured materials across three catalytic scenarios: piezoelectric, pyro catalytic, and photocatalytic. Our primary focus was on renewable energy generation and environmental remediation, particularly targeting the removal of organic pollutants. Our methods achieved an impressive removal efficiency of up to 95% for methylene blue (MB) dye. Additionally, we demonstrated the efficacy of integrating magnetic nanoparticles into electrospun nanofibers to improve the adsorption of heavy metals, specifically lead and copper contaminants. This research provides a comprehensive examination of nanomaterial-based energy harvesting systems, utilizing ferroelectric, sonocatalytic, and photocatalytic approaches.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"38 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832045","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}
Raluca Svensson, Josep García Martínez, Mikael T Ekvall, Annette Krais, Katja Bernfur, Thom Leiding, Martin Lundqvist, Tommy Cedervall
Fragmented micro- and nanoplastics are widespread pollutants with adverse effects on the environment. However, the breakdown process does not end with micro- and nanoplastics but is expected to continue until carbon dioxide has been formed. During this process the plastics will undergo chemical changes and small molecules may be released. We have broken down small amine-modified (53 nm) and carboxyl-modified (62 nm) polystyrene nanoparticles by UV-B irradiation. We see a decreasing size and an oxidation of the nanoparticles over time. Simultaneously, the toxicity to zooplankton Daphnia magna decreases. The UV-B irradiation releases small, dissolved molecules that are toxic to Daphnia magna. The dissolved molecules include aminated alkyls, styrene remnants and secondary circularization products. The study show that UV-B radiation can change the original toxicity of nanoplastics and release new toxic substances.
{"title":"UV-B degradation affects nanoplastic toxicity and leads to release of small toxic substances","authors":"Raluca Svensson, Josep García Martínez, Mikael T Ekvall, Annette Krais, Katja Bernfur, Thom Leiding, Martin Lundqvist, Tommy Cedervall","doi":"10.1039/d4en00795f","DOIUrl":"https://doi.org/10.1039/d4en00795f","url":null,"abstract":"Fragmented micro- and nanoplastics are widespread pollutants with adverse effects on the environment. However, the breakdown process does not end with micro- and nanoplastics but is expected to continue until carbon dioxide has been formed. During this process the plastics will undergo chemical changes and small molecules may be released. We have broken down small amine-modified (53 nm) and carboxyl-modified (62 nm) polystyrene nanoparticles by UV-B irradiation. We see a decreasing size and an oxidation of the nanoparticles over time. Simultaneously, the toxicity to zooplankton Daphnia magna decreases. The UV-B irradiation releases small, dissolved molecules that are toxic to Daphnia magna. The dissolved molecules include aminated alkyls, styrene remnants and secondary circularization products. The study show that UV-B radiation can change the original toxicity of nanoplastics and release new toxic substances.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"10 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832044","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}
Ao Liang, Yunzheng Zhang, Xiang Xu, Hao Wang, Changwei Gong, Jie Hu, Xiangsong Li, Jizhi Yang, Anchun Peng, Xuegui Wang
Chilo suppressalis is a major pest that severely impacts rice production in China. However, the widespread use of insecticides has resulted in the development of resistance in C. suppressalis. The advancement of nanotechnology offers promising prospects for enhancing insecticide formulations and improving their efficacy. This study designed a pH-responsive release system composed of γ-PGA and chitosan (CS) loaded with chlorantraniliprole (CLAP). The synthesized CLAP-loaded nanoparticles had an average particle size of approximately 39.67 nm and a loading efficiency of 38.87%. Under a pH of 8.5, 64.4% of the pesticide was released within 120 hours. The CLAP@CS/γ-PGA formulation, after loading, exhibited a significant synergistic insecticidal effect, with bioassay results showing an 82.2% mortality rate of C. suppressalis six days post-treatment. Tests of metabolic genes and enzyme activities showed that CLAP@CS/γ-PGA rendered C. suppressalis more sensitive to insecticides by inhibiting the activities of P450 and by decreasing the expression of CYP9A68. CLAP@CS/γ-PGA also demonstrated favorable transport properties within C. suppressalis and rice plants, and due to the encapsulation by the nanoparticle carrier, it reduced toxicity to zebrafish. In summary, the system we investigated not only meets the needs of pest management but also enhances the utilization of pesticides.
{"title":"Eco-friendly chitosan base chlorantraniliprole nano-pesticides for effective control of Chilo suppressalis (Walker) through bidirectional transport","authors":"Ao Liang, Yunzheng Zhang, Xiang Xu, Hao Wang, Changwei Gong, Jie Hu, Xiangsong Li, Jizhi Yang, Anchun Peng, Xuegui Wang","doi":"10.1039/d4en00724g","DOIUrl":"https://doi.org/10.1039/d4en00724g","url":null,"abstract":"<em>Chilo suppressalis</em> is a major pest that severely impacts rice production in China. However, the widespread use of insecticides has resulted in the development of resistance in <em>C. suppressalis</em>. The advancement of nanotechnology offers promising prospects for enhancing insecticide formulations and improving their efficacy. This study designed a pH-responsive release system composed of γ-PGA and chitosan (CS) loaded with chlorantraniliprole (CLAP). The synthesized CLAP-loaded nanoparticles had an average particle size of approximately 39.67 nm and a loading efficiency of 38.87%. Under a pH of 8.5, 64.4% of the pesticide was released within 120 hours. The CLAP@CS/γ-PGA formulation, after loading, exhibited a significant synergistic insecticidal effect, with bioassay results showing an 82.2% mortality rate of <em>C. suppressalis</em> six days post-treatment. Tests of metabolic genes and enzyme activities showed that CLAP@CS/γ-PGA rendered <em>C. suppressalis</em> more sensitive to insecticides by inhibiting the activities of P450 and by decreasing the expression of <em>CYP9A68</em>. CLAP@CS/γ-PGA also demonstrated favorable transport properties within <em>C. suppressalis</em> and rice plants, and due to the encapsulation by the nanoparticle carrier, it reduced toxicity to zebrafish. In summary, the system we investigated not only meets the needs of pest management but also enhances the utilization of pesticides.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"38 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832042","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}
The combination of semiconductor photocatalyst mediated photocatalytic reaction and persulfate activation is considered as a promising way to achieve efficient degradation of recalcitrant organic pollutants in water. Here, a series of Cu-doped BiO2-x nanosheets was successfully manufactured and carried out to activate peroxymonosulfate (PMS) for the removal of ciprofloxacin (CIP). Here, with the help of visible light, the optimal Cu-doped BiO2-x nanosheet (CBO-1) activating PMS for the removal of CIP has a degradation rate 4.64 times more than that of BiO2-x. Photo/electro-chemical characterizations and theoretical calculations have demonstrated that the introduction of Cu can also increase the electron density near the Fermi level, which accelerates the separation and movement of photo-generated carriers of photocatalysts, and then reduces the activation energy barrier of PMS and improves its utilization efficiency. Besides, the Cu center with poor electrons was prone to form Cu ligands with CIP for enhancing the reduction of Cu(II) to accelerate the activation of PMS. Therefore, this work proposes a thinking on synthesizing efficient semiconductor photocatalysts for activating PMS, providing a valuable reference for the efficient mineralization of recalcitrant contaminant in water.
{"title":"Enhanced peroxymonosulfate activation by copper-doped bismuth oxides for the efficient photo-degradation of ciprofloxacin: Crucial role of copper sites, theory calculation and mechanism insight","authors":"Wei Wang, Zhixiong Yang, Yuan Li, Junting Wang, Gaoke Zhang","doi":"10.1039/d4en00994k","DOIUrl":"https://doi.org/10.1039/d4en00994k","url":null,"abstract":"The combination of semiconductor photocatalyst mediated photocatalytic reaction and persulfate activation is considered as a promising way to achieve efficient degradation of recalcitrant organic pollutants in water. Here, a series of Cu-doped BiO2-x nanosheets was successfully manufactured and carried out to activate peroxymonosulfate (PMS) for the removal of ciprofloxacin (CIP). Here, with the help of visible light, the optimal Cu-doped BiO2-x nanosheet (CBO-1) activating PMS for the removal of CIP has a degradation rate 4.64 times more than that of BiO2-x. Photo/electro-chemical characterizations and theoretical calculations have demonstrated that the introduction of Cu can also increase the electron density near the Fermi level, which accelerates the separation and movement of photo-generated carriers of photocatalysts, and then reduces the activation energy barrier of PMS and improves its utilization efficiency. Besides, the Cu center with poor electrons was prone to form Cu ligands with CIP for enhancing the reduction of Cu(II) to accelerate the activation of PMS. Therefore, this work proposes a thinking on synthesizing efficient semiconductor photocatalysts for activating PMS, providing a valuable reference for the efficient mineralization of recalcitrant contaminant in water.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"18 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825594","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}
Yuanfang Li, Xiaoshu Lv, Yan Liu, Jie Yin, Ruimei Fang, Guangming Jiang, Zhehan Yang
Abstract: A rational design of water-stable and high-efficiency MOFs-based electrocatalysts thus achieving durable sensitive electrochemical sensors remains a great challenge. Herein, water-stable Co2+ doped-Cu2+ and 1,3,5-benzene tricarboxylic coordination polymers (Cu-BTC@Co) were designed to construct a sensitive and durable electrochemical sensor for simultaneously detecting multiple hazardous phenols. Combining the Mulliken charges of H2O and BTC, the mechanism of the water-stability of Cu-BTC@Co was discussed, which is owing to the intermolecular force (Cu-BTC and Cu-OH2) and the intramolecular force (π-π bond, COO-H2O hydrogen bond), making Cu2+ coordination to BTC being much stronger than water, thereby the Cu-BTC@Co with strong stability in the water environment was achieved. Moreover, doping Co2+ into Cu-BTC not only improves the electron transfer efficiency of Cu-BTC but also enhances the catalytical efficiency of Cu-BTC. Combining the high-efficiency selective catalysis of Cu-BTC@Co and oxidation potential difference among multiple phenols, the Cu-BTC@Co sensor can simultaneously quantitative and qualitative detection of multiple phenols with good multicycle sensing performance. This article clarifies the mechanism of synthesizing water-stable MOFs and promotes the application of MOFs-based sensors in the quantitative analysis of water pollutants.
{"title":"Efficient simultaneously quantitative and qualitative detection of multiple phenols using highly water-stable Co2+‐doped Cu-BTC as electrocatalyst","authors":"Yuanfang Li, Xiaoshu Lv, Yan Liu, Jie Yin, Ruimei Fang, Guangming Jiang, Zhehan Yang","doi":"10.1039/d4en00912f","DOIUrl":"https://doi.org/10.1039/d4en00912f","url":null,"abstract":"Abstract: A rational design of water-stable and high-efficiency MOFs-based electrocatalysts thus achieving durable sensitive electrochemical sensors remains a great challenge. Herein, water-stable Co2+ doped-Cu2+ and 1,3,5-benzene tricarboxylic coordination polymers (Cu-BTC@Co) were designed to construct a sensitive and durable electrochemical sensor for simultaneously detecting multiple hazardous phenols. Combining the Mulliken charges of H2O and BTC, the mechanism of the water-stability of Cu-BTC@Co was discussed, which is owing to the intermolecular force (Cu-BTC and Cu-OH2) and the intramolecular force (π-π bond, COO-H2O hydrogen bond), making Cu2+ coordination to BTC being much stronger than water, thereby the Cu-BTC@Co with strong stability in the water environment was achieved. Moreover, doping Co2+ into Cu-BTC not only improves the electron transfer efficiency of Cu-BTC but also enhances the catalytical efficiency of Cu-BTC. Combining the high-efficiency selective catalysis of Cu-BTC@Co and oxidation potential difference among multiple phenols, the Cu-BTC@Co sensor can simultaneously quantitative and qualitative detection of multiple phenols with good multicycle sensing performance. This article clarifies the mechanism of synthesizing water-stable MOFs and promotes the application of MOFs-based sensors in the quantitative analysis of water pollutants.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"21 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142805218","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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