Environmental Science: Nano最新文献

{"title":"Nanomaterials for managing abiotic and biotic stress in the soil–plant system for sustainable agriculture","authors":"Loren Ochoa, Manoj Shrivastava, Sudhakar Srivastava, Keni Cota-Ruiz, Lijuan Zhao, Jason C. White, Jose Angel Hernandez-Viezcas, Jorge L. Gardea-Torresdey","doi":"10.1039/d4en00789a","DOIUrl":"https://doi.org/10.1039/d4en00789a","url":null,"abstract":"As the global population steadily increases, the need to increase agricultural productivity has become more pressing. It is estimated that agricultural production needs to double in less than 30 years to meet the projected food demand. However, crop species are being cultivated under a range of increasingly challenging environmental stressors, including the effects of climate change and factors. To address these issues, nanotechnology has emerged as an enabling strategy to bolster plant resistance to the adverse effects of stressors and improve their overall performance. In this review, we evaluate recent research in this field, examining the strategies by which nanomaterials (NMs) and nanoparticles (NPs) have been used to facilitate enhanced tolerance to pests, excessive salinity in soil, pathogenic fungi, and other stressors. The intent is to focus on the mechanisms by which plants cope with environmental stressors at the physiological and molecular levels. We also examine how plants interact with and acquire NMs, with a specific focus on the mechanisms behind their beneficial effects regarding stress response. Our review also evaluates key knowledge gaps and offers suggestions on how to address them. Additionally, we discuss the potential of NMs to enhance agricultural production systems and highlight essential considerations for mitigating crop stress and promoting sustainable agriculture at a global scale. While the use of nanotechnology in the agricultural sector is growing and shows tremendous promise, more mechanistic studies and field-scale demonstrations are needed to fully understand and optimize the use of nanomaterials on plants stress tolerance in a changing climate. In addition, few studies conducted life cycle field experiments to verify the effects of nano-agrichemicals on yield and nutritional quality, and importantly, there is a lack of multiple-year and multiple-location experiments. Only by doing this can the technology-readiness-level of nano-enabled agro-technologies be improved and forwarded to commercial application.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"187 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142718571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Oxygen vacancies boost the efficacy of MnO2 nanoparticles in catalyzing hydrolytic degradation of organophosphate esters: Implications for managing plastic additive pollution","authors":"Zongsheng Liang, keman liu, Yueyue Li, Yaqi Liu, Chuanjia Jiang, Tong Zhang, Wei Chen","doi":"10.1039/d4en00911h","DOIUrl":"https://doi.org/10.1039/d4en00911h","url":null,"abstract":"The widespread plastic pollution has raised significant concerns. The breakdown process of plastic debris during weathering not only generate microplastics and nanoplastics, but also release large quantities of harmful chemical additives such as phthalates and organophosphate esters (OPEs). Metal oxides, particularly those in the form of nanoparticles, play an essential role in mediating the environmental transformation of plastic additives. However, the key structure–activity relationships governing metal oxide-mediated transformation processes remain poorly understood. Here, we demonstrate that oxygen vacancies (OVs), which are common in metal oxide nanomaterials, significantly contribute to the enhanced catalytic performance of α-MnO2 nanoparticles in promoting the hydrolysis of 4-nitrophenyl phosphate (pNPP), a model OPE pollutant. The α-MnO2 nanorods containing different OV concentrations (obtained by calcination under different atmospheres, i.e., N2 versus air) promote pNPP hydrolysis to different degrees, and the α-MnO2 material with a higher OV concentration shows higher catalytic activity. The results from spectroscopic and theoretical investigations reveal that OVs regulate the adsorption affinity to pNPP by adjusting the coordination saturation of the Mn site on the α-MnO2 surface. Additionally, the enhanced Lewis acidity at these sites (as confirmed by pyridine adsorption infrared spectroscopy and temperature-programmed desorption of ammonia) promotes the electron redistribution in pNPP, which decreases the stability of the P–O bond and enhances the reactivity of α-MnO2 towards pNPP. The findings demonstrate that metal oxide nanomaterials can significantly influence the fate and transformation of microplastic additives, and highlight the potential of defect engineering in amplifying metal oxides’ efficacy for environmental cleanup.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"37 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142718569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Solid Phase Silver Sulfide Nanoparticles Contribute Significantly to Biotic Silver in Agricultural Systems","authors":"Yingnan Huang, Huijun Yan, Fei Dang, Zhenyu Wang, Jason C. White, Yujun Wang","doi":"10.1039/d4en00961d","DOIUrl":"https://doi.org/10.1039/d4en00961d","url":null,"abstract":"The current and continued influx of engineered nanoparticles (NPs) into the environment is significant, including the release of NPs that have been historically stored or retained in soils to various waterbodies. However, the reactivity and dynamic nature of NPs transformation processes are poorly understood due to the lack of long-term environmentally relevant experiments that accurately represent ecosystem complexity. Here, we established a two-year mesocosm system to quantify the relative reactivity of silver sulfide NPs using stable isotope tracers, with more recent 109Ag2S-NPs inputs to the 80 L water column (water-borne NPs, 141 mg) and historically stored Ag2S-NPs in soils (soil-borne NPs, 4.5 ± 0.3 μg g−1). Soil-borne NPs accounted for 59.4–92.1% of the Ag accumulation in the grain of rice Oryza sativa L. (31.4–112.4 μg kg−1), radish roots Raphanus sativus L. (106.2–396.7 μg kg−1), and rice borers Chilo suppressalis (21.5–30.7 μg kg−1), highlighting the significance of soil-borne NPs in agricultural ecosystems. Based on the measured soil-to-plant transfer factors, recommended concentrations of soil-borne NPs should be less than 2.4 μg Ag g−1 for rice growth and 0.7 μg Ag g−1 for radish growth to minimize human exposure to silver via consumption of these edible tissues. This work demonstrates that quantifying the reactivity of NPs transformation processes and different NPs fractions in the environment is not only important to accurately characterizing the risk of these materials but also to ensuring the safety and sustainability of agriculture.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"16 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142713244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel Ce-doped hydrotalcite for the efficient removal of tetracycline hydrochloride in the photo-Fenton system: from properties to mechanisms","authors":"Yanshu Chen, Xia Liu, Ximan Wang, Shuanghui Sun, Yunfeng Wu, Siqi Bao, Lei Xu","doi":"10.1039/d4en00865k","DOIUrl":"https://doi.org/10.1039/d4en00865k","url":null,"abstract":"In this study, a novel Ce-doped hydrotalcite (Ce-NiFe-LDHs) was synthesized by co-precipitation, which completely removed tetracycline hydrochloride (TC-HCl) in the photo-Fenton system within 60 min, and showed excellent stability and durability in cycling tests. In addition, the catalyst has demonstrated a wide range of adaptability to environmental conditions in the photo-Fenton system, maintaining efficient catalytic performance regardless of water quality differences, environmental factors or different types of antibiotics. The introduction of rare earth element Ce can not only effectively reduce the band gap width of the catalyst and broaden its absorption capacity in the visible light range, but also promote the efficient migration and separation of photogenerated carriers by optimizing the optical properties, further improving the catalytic efficiency. The free radical quenching experiment and electron spin resonance test revealed the core role of photogenerated hole as the main active substance. Combined with high performance liquid chromatography-mass spectrometry and density functional theory calculations, the degradation pathways were proposed. Meantime, through the Toxicity Estimation Software Tool and germination and growth test of soybean, it was found that the reaction was a process of toxicity reduction. This study provides a new strategy and theoretical basis for the future study of heterogeneous catalytic decomposition of antibiotic residues.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"8 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142713321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of Different Soil Solutions on the Stability and Photocatalytic Activity of Commercial Zinc Oxide Nanoparticles","authors":"Karolina Solymos, Eszter Kanász, Áron Ágoston, Tamás Gyulavári, Benjámin Pálffy, Ákos Szamosvölgyi, Akos Kukovecz, Zoltan Konya, Zsolt Pap","doi":"10.1039/d4en00354c","DOIUrl":"https://doi.org/10.1039/d4en00354c","url":null,"abstract":"Zinc oxide (ZnO) nanoparticles are extensively utilized across various industries due to their versatile applications. However, the widespread use of these nanoparticles raises concerns regarding their potential release into soil environments, and also into the soil solution. Therefore, this study aims to delve into the interplay between different soil solution properties and the stability as well as photocatalytic activity of commercially available ZnO nanoparticles. It is observed that these interactions precipitate a reduction in the primary crystallite sizes of ZnO, primarily attributed to the release of Zn2+ ions under acidic conditions, and the formation of zinc complexes or hydroxides in alkaline environments. In acidic media, there is a concomitant decrease in the hydrodynamic diameter of ZnO, serving as further confirmation of Zn2+ release, which is corroborated by analytical measurements. Conversely, in alkaline mediums, the hydrodynamic diameter remains unaltered, suggesting the formation of an amorphous layer on the nanoparticle surface in such conditions. Further analyses into the surface chemistry of ZnO nanoparticles reveal the adsorption of various organic substances onto their surfaces. These organic compounds potentially function as electron traps or occupy active sites, however, after the interaction with soil solutions, the material was still able to degrade the model pollutant. So, the interaction with soil solutions reduced the activity, but the catalyst retained its efficiency. In essence, this study underscores the importance of comprehensively understanding the behavior of ZnO nanoparticles in soil environments. Such insights are pivotal for informed decision-making regarding the sustainable utilization of ZnO nanoparticles across various industrial domains.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"27 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142713320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Complete degradation of 2,4-dichlorophenol in sequential sulfidated nanoscale zero-valent iron/peroxydisulfate system: Dechlorination, mineralization and mechanism","authors":"Zhoujie Pi, Puyu Zhou, Kun Luo, Li He, Shengjie Chen, Zhu Wang, Shanshan Zhang, Xiaoming Li, Qi Yang","doi":"10.1039/d4en00737a","DOIUrl":"https://doi.org/10.1039/d4en00737a","url":null,"abstract":"Chlorophenols (CPs) have strong toxicity because of the presence of chlorine atom. Although the dechlorination can eliminate their toxicity, by-product organics maybe bring secondary pollution. In this study, a two-step process of pre-reduction dechlorination and oxidation, reductive dechlorination by sulfidated nanoscale zero-valent iron (S-nZVI) and advanced oxidation by S-nZVI-activated peroxydisulfate (PDS), was innovatively adopted to achieve efficient and complete mineralization of 2,4-dichlorophenol (2,4-DCP). The pre-reduction of S-nZVI achieved 80% dechlorination of 2,4-DCP. With the subsequent addition of PDS, 2,4-DCP and its dechlorination by-products in solution was almost completely removed and the mineralization rate reached to 91.5% under the optimal conditions of unadjusted initial pH (5.4), S-nZVI dosage 2.5 g·L-1, and PDS concentration 1.8 mM. The electron spin resonance (ESR) and radical quenching experiments demonstrated that both ·OH and SO4·- were involved in the degradation of 2,4-DCP, while SO4·- played the more predominate role. Based on the transformation products of 2,4-DCP identified by GC-MS, the degradation mechanism of 2,4-DCP in this system included two steps, namely, reductive dechlorination induced by electrons transformation and oxidation degradation involving single electron transfer, radical adduct formation, and hydrogen atom abstraction. This study demonstrated that the noval S-nZVI pre-reduction and sequential S-nZVI/PDS process is a very promising and efficient approach for complete removal of CPs in water.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"20 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142690955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of Fenton-like reaction pathways using Ov-containing ZnO@nitrogen-rich porous carbon: the electron transfer and 1O2 triggered non-radical process","authors":"Zhenfeng Zhang, Tianli Xiong, Haihao Peng, Honglin Zhang, Siying He, Xuran Liu, Yanan Liu, Wenyi Feng, Zhaohui Yang, Weiping Xiong","doi":"10.1039/d4en00749b","DOIUrl":"https://doi.org/10.1039/d4en00749b","url":null,"abstract":"With the development of persulfate-based Fenton-like catalysis, how to control the PDS reaction pathway is a great challenge. Herein, we prepared catalysts with nitrogen-rich porous carbon (NPC) layers and oxygen vacancy (O<small>_v</small>) sites for PDS activation to degrade sulfamethazine (SMZ). Results revealed that the ZnO@NPC/PDS system exhibited only non-radical pathways, which comprised the singlet oxygen (<small>¹</small>O<small>₂</small>) and electron transfer process. The intrinsic mechanism underlying the production of active species was further verified by comparing the results of the ZnO@NPC/PDS and ZnO@NPC-Etch/PDS systems, Raman analysis and DFT calculations. Adsorption of PDS by carbon layers resulted in the formation of a catalyst–PDS complex, which not only elongated the S–O bond and accelerated the decomposition of PDS to generate <small>¹</small>O<small>₂</small> but also provided access for electron transfer. Meanwhile, O<small>_v</small> sites increased electron density and electron migration strength, which promoted more electron transfer from O<small>_v</small>s to PDS molecules through nitrogen-rich porous carbon layers. Moreover, the ZnO@NPC/PDS system could maintain a degradation rate of &gt;90% for SMZ in real water matrixes. T. E. S. T software prediction and toxicity tests were used to investigate environmental implications of degradation intermediates, which showed reduced ecological toxicity compared with SMZ. This work fabricated the ZnO@NPC/PDS system and explored the interaction between nitrogen-rich porous carbon layers and O<small>_v</small> to regulate the occurrence of non-radical pathways, which could provide a strategy to control the PDS reaction pathway.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"129 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Facet-Dependent Hematite Reactivity in Cr(Ⅵ) Removal with Fe(Ⅱ)","authors":"Shengnan Zhang, Lingyi Li, Junxue Li, Wei Cheng","doi":"10.1039/d4en00733f","DOIUrl":"https://doi.org/10.1039/d4en00733f","url":null,"abstract":"Hematite displays diverse crystal structures and often coexists with Fe(Ⅱ), both of which are crucial in controlling the fate and mobility of Cr(Ⅵ). However, the mechanisms underlying Cr(Ⅵ) removal in the presence of Fe(Ⅱ) on various hematite facets remain elusive. This study aims to elucidate the facet-dependent reactivity of hematite nanocrystals in conjunction with Fe(Ⅱ) for the removal Cr(Ⅵ) from aqueous solutions. Hematite nanoplates (HNPs), predominantly composed of {001} facets, and nanorods (HNRs), exposing both {001} and {110} facets, were synthesized and characterized. Their Cr(VI) removal capabilities were evaluated in hematite-Cr(VI) and hematite-Fe(II)-Cr(VI) systems, as well as the Fe(II)-Cr(VI) system. The adsorption of Fe(Ⅱ) and Cr(VI) on hematite surfaces was highly dependent on the crystal facets and pH, with HNRs demonstrating superior Cr(Ⅵ) adsorption over HNPs, especially under acidic conditions. Neutral pH favored Fe(II)-Cr(VI) redox reactions and Fe(II) adsorption. The hematite-Fe(Ⅱ) couple displayed a synergistic effect in removing Cr(Ⅵ) under acidic conditions, which was not observed under neutral conditions. The presence of Fe(Ⅱ) notably enhanced Cr(Ⅵ) adsorption onto hematite, and bound Fe(Ⅱ) facilitated electron transfer, accelerating Cr(Ⅵ) reduction. HNRs-Fe(Ⅱ) exhibited higher Cr(Ⅵ) removal efficiency than HNPs-Fe(Ⅱ) due to their lower free corrosion potential and improved electron transport properties. This research underscores the potential of facet engineering in optimizing hematite nanocrystals for environmental remediation, specifically in Cr(Ⅵ)-contaminated environments.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"46 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Emerging investigator series: CeO2/CuO nanostructured composite with enhanced antimicrobial properties and low cytotoxicity to human keratinocytes in vitro","authors":"Svetlana Vihodceva, Andris Šutka, Mairis Iesalnieks, Liga Orlova, Arturs Pludonis, Maarja Otsus, Mariliis Sihtmäe, Heiki Vija, Alexandra Nefedova, Angela Ivask, Anne Kahru, Kaja Kasemets","doi":"10.1039/d4en00501e","DOIUrl":"https://doi.org/10.1039/d4en00501e","url":null,"abstract":"This research presents a synthesis method for the CeO&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;/CuO nanostructured composite, which has potential applications as an antimicrobial material in the production of antimicrobial surface coatings, for example, for high-touch surfaces. The antimicrobial efficacy, mode of action, and potential cytotoxicity of CeO&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;/CuO towards the human immortalized keratinocyte cell line &lt;em&gt;in vitro&lt;/em&gt; were studied compared to those of CuO, CeO&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;, and ionic Cu (a solubility control). The used synthesis method resulted in a CeO&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;/CuO nanostructured composite with a mean particle size of 27 nm and a specific surface area of 80.3 m&lt;small&gt;&lt;sup&gt;2&lt;/sup&gt;&lt;/small&gt; g&lt;small&gt;&lt;sup&gt;−1&lt;/sup&gt;&lt;/small&gt;. The composite had a significant proportion (54%) of non-lattice oxygen species, highlighting the presence of substantial surface defects crucial for generating reactive oxygen species (ROS). The antimicrobial properties of CeO&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;/CuO, CuO, and CeO&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt; were assessed at six concentrations from 1 to 1000 mg L&lt;small&gt;&lt;sup&gt;−1&lt;/sup&gt;&lt;/small&gt; in deionized water. The CeO&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;/CuO composite exhibited antibacterial efficacy at a minimum bactericidal concentration (MBC) of 100 mg L&lt;small&gt;&lt;sup&gt;−1&lt;/sup&gt;&lt;/small&gt; towards &lt;em&gt;Escherichia coli&lt;/em&gt; already after 2 h of contact and towards &lt;em&gt;Pseudomonas aeruginosa&lt;/em&gt; and &lt;em&gt;Staphylococcus aureus&lt;/em&gt; after 4 h of contact, whereas after 24 h of exposure, the antibacterial efficacy to all three bacterial strains was evident already at a MBC = 10 mg L&lt;small&gt;&lt;sup&gt;−1&lt;/sup&gt;&lt;/small&gt;. Fungi &lt;em&gt;Candida albicans&lt;/em&gt; proved less susceptible than bacteria (24 h MBC = 100 mg L&lt;small&gt;&lt;sup&gt;−1&lt;/sup&gt;&lt;/small&gt;). Thus, the CeO&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;/CuO composite showed significant antibacterial efficacy against Gram-negative and Gram-positive bacteria, being at the same time safe to human keratinocytes &lt;em&gt;in vitro&lt;/em&gt; in the case of which even 1000 mg L&lt;small&gt;&lt;sup&gt;−1&lt;/sup&gt;&lt;/small&gt; caused no harmful effects after 2 h exposure and 500 mg L&lt;small&gt;&lt;sup&gt;−1&lt;/sup&gt;&lt;/small&gt; caused no cytotoxicity after 24 h exposure. CeO&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;/CuO caused abiotic and biotic ROS production in all the tested environments. ROS production in deionized water was the most remarkable. Shedding of Cu-ions from CeO&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;/CuO was moderate and depended on the test environment, varying from 0.3 to 1 mg L&lt;small&gt;&lt;sup&gt;−1&lt;/sup&gt;&lt;/small&gt;, and considering the MBC of ionic Cu for microorganisms was not the main contributor to the antimicrobial activity of CeO&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;/CuO. The CeO&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;/CuO composite exhibited no acute toxicity to the environmentally relevant bacterium &lt;em&gt;Vibrio fischeri&lt;/em&gt;. These findings indicate that CeO&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;/CuO's high ROS production is its primary antimicrobial mechanism and that due to its low cytotoxicit","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"34 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimizing oxygen vacancy concentration and electronic transport processes in a MnxCo/CeO2 nanoreactor: regulation mechanism of the radical to non-radical pathway","authors":"Hailan Qin, Jiahao Wang, Siyuan Di, Yunkang Liu, Pin Chen, Min Liu, Qiuyue Zhang, Shukui Zhu","doi":"10.1039/d4en00892h","DOIUrl":"https://doi.org/10.1039/d4en00892h","url":null,"abstract":"Enhancing the efficiency of electron transfer and augmenting the utilization rate of peroxymonosulfate (PMS) pose challenges for advanced oxidation processes (AOPs). A high-performance bimetallic-doped catalyst (MnCo/CeO<small>₂</small>) with an appropriate concentration of oxygen vacancies (OVs) was successfully designed using a straightforward synthesis strategy. It primarily activates PMS through non-radical pathways. Systemic characterization, experiments, and theoretical calculations have demonstrated that reasonable OVs and the Mn/Co bimetallic doping strategy effectively modulated the surface spatial electron structure and greatly improved interfacial electron transfer processes (ETP). Ultimately, MnCo/CeO<small>₂</small> exhibits a remarkable ciprofloxacin (CIP) removal efficiency of 93.71% (<em>k</em> = 0.03501 min<small>⁻¹</small>) within 50 min (after 5 cycles, 89%), which is 5.03 times faster than that of traditional CeO<small>₂</small> (<em>k</em> = 0.00696 min<small>⁻¹</small>), and the possible degradation pathway as well as toxicity of intermediate products were identified using LC-MS, Fukui function analysis, and toxicity evaluation. This work proposes a feasible strategy for designing bimetallic-doped metallic oxide catalysts, which have great application potential for the degradation of organic contaminants under actual harsh environmental conditions.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"13 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678201","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}