检索结果-内蒙古大学图书馆

Adsorption of So2 and Nh3 Onto Copper/Graphene Nanosheets Composites: Statistical Physics Interpretations, Thermodynamic Investigations, and Site Energy Distribution Analyses

学校读者我要写书评

暂无评论

SSRN 2022年

作者： Zhang, Lei Yang, Libin Chen, Jiabin Zhou, Xuefei State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China Key Laboratory of Yangtze Water Environment for Ministry of Education College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Tongji University Shanghai200092 China

Copper/graphene nanosheets composites (CGCs) were adopted as multi-gas adsorbents to remove two harmful gases (i.e., ammonia and sulfur dioxide) in the atmospheric environment, respectively. Methods such as N2 adsorption/desorption, scanning electron microscopy, and X-ray diffraction were selected to fully characterize CGCs. Under laboratory conditions, the adsorption isotherms of NH3 and SO2 onto CGCs at three different temperatures (298.15 K, 308.15 K, and 318.15 K) and different pressures (0~1.8 bar) are quantitatively tested. A multilayer model with saturation (M5) was adopted as the best suitable model to explore the adsorption mechanism for SO2-CGCs and NH3-CGCs adsorption systems from a molecular level. The numerical simulation results demonstrated that the adsorption of NH3 by CGCs is a multi-anchorage process and a pure parallel adsorption position (298.15 K), a multi-linking process and a mixed adsorption orientation (308.15 K and 318.15 K). In contrast, SO2-CGCs adsorption system at 298.15 K, 308.15 K, and 318.15 K, there will be a multi-molecule process and a pure non-parallel adsorption position. Overall, from statistical physical, thermodynamic and SED analyses, the adsorption mechanism of SO2 and NH3 on CGCs, which was mainly governed by the density of receptor sites (Dm), was a spontaneous exothermic reversible adsorption process driven by physical interaction forces, while the high temperature is detrimental to the occurrence of high adsorption capacity. © 2022, The Authors. All rights reserved.

关键词： Sulfur dioxide

A Novel Equal Frequency Sampling of Factor Levels (Efsfl) Method is Applied to Identify the Dominant Factor Inducing the Combined Toxicities of 13 Factors

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Ding, Ting-Ting Liu, Shu-Shen Wang, Ze-Jun Huang, Peng Gu, Zhong-Wei Tao, Meng-Ting Key Laboratory of Yangtze River Water Environment Ministry of Education College of Environmental Science and Engineering Tongji University Shanghai200092 China State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology School of Environmental Science and Engineering Suzhou University of Science and Technology Suzhou215009 China

The research framework combining the global sensitivity analysis (GSA) with quantitative high-throughput screening (qHTS), called as GSA-qHTS, provides a potentially feasible way to screen for important factors that induce toxicities of complex mixtures. However, in the mixture samples designed using the GSA-qHTS technique, the numbers of occurrence between the different levels of the different factors were unequal,which leads to asymmetry on importance of elementary effects (EEs) computed from the mixture toxicities. Therefore, a new mixture design program, which has a nature of equal frequency sampling of factor levels (EFSFL), was developed in this study to balance the importance of various EEs. The program (simply EFSFL) has been successfully employed to design 168 mixtures of 13 factors (12 chemicals and time) that each has three levels. By means of time-microplate toxicity analysis and EE analysis, the toxicity change rules of the mixtures are revealed and the important factors affecting the toxicities of the mixtures are screened. It was found that the mixtures can be classified into low, middle and high toxic mixtures according to the toxicities at 12 h, and all the middle and high toxic mixtures contain erythromycin of the maximum concentration. It was also found that the toxicities of the middle toxic mixtures increase firstly over time (0.25~9 h) and then decrease (12 h) while those of the high toxic mixtures consistently increase over *** low toxic mixtures produce stimulation that increases with time. Erythromycin is the dominant factor in mixture toxicities, and therefore priority should be given to controlling the environmental risks of erythromycin in environmental risk management. Our sampling strategy allows for equal frequency sampling of factor levels, which provides a foundation for more accurate identification of important factors that induce mixture toxicity. © 2023, The Authors. All rights reserved.

关键词： Antibiotics

Deriving the Predicted No Effect Concentrations of 35 Pesticides by the Qsar-Ssd Method

学校读者我要写书评

暂无评论

SSRN 2022年

作者： Huang, Peng Liu, Shu-Shen Wang, Ze-Jun Ding, Ting-Ting Xu, Ya-Qian Key Laboratory of Yangtze River Water Environment Ministry of Education College of Environmental Science and Engineering Tongji University Shanghai200092 China State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

The widespread use of pesticides results in their frequent detection in water bodies and other environmental media. Pesticide residues in water may pose environmental risks, and reliable predicted no effect concentrations (PNEC) must be obtained when the environmental risks of pesticides are assessed. Species sensitivity distribution (SSD) is an important method for the derivation of chemical PNECs. Construction of an SSD model for deriving a regulatory-prescribed PNEC is considered to require sufficient toxicity data to various species including at least eight families in three phyla, suitable nonlinear fitting functions and assessment factors (AFs) that lower the calculated SSD-based PNEC to address uncertainties in the number and quality of the input data. However, most chemicals lack the toxicity data for some species, while some chemicals, although with sufficient toxicity data, cannot find suitable fitting functions, thus hinder the construction of effective SSD models. To this end, the established QSAR models were applied to predict toxicity of chemicals to specific species to fill in the toxicity data gaps required for SSD and selecting multiple nonlinear functions to optimize the SSD model, a new method called QSAR-SSD was developed in this study and successfully used to derive the acute PNECs of 35 pesticides. Three QSAR models were used to predict the toxicities of six pesticides with less data. Nine two-parameter nonlinear functions were used to fit the toxicity-cumulative probability data one by one to determine the optimal SSD models. The hazardous concentrations at the cumulative probability of 5% and 10% of various pesticides (HC5 and HC10) were calculated by the optimal SSD models. It is found that HC10 has a good power function relationship with HC5, so it is recommended using HC10 to derive PNEC, which may be more plausible, especially if the toxicity data is insufficient. © 2022, The Authors. All rights reserved.

关键词： Risk assessment

Co2(Oh)2co3 and Fe Doped Co2(Oh)2co3 Prepared as Efficient and Stable Catalysts for Activation of Pms: Two Systems Comparison and key Role of High-Valent Metal in Mechanism Revealing

学校读者我要写书评

暂无评论

SSRN 2024年

作者： Peng, Cheng Wang, Qiongfang Zhang, Xin Dong, Lei Yuan, Yulin Zhang, Min Rao, Pinhua Gao, Naiyun Deng, Jing College of Chemistry and Chemical Engineering Shanghai University of Engineering Science Shanghai201600 China Co. LTD Shanghai200092 China State Key Laboratory of Pollution Control Reuse Tongji University Shanghai200092 China College of Civil Engineering and Architecture Zhejiang University of Technology Hangzhou310014 China Tongji University China

Manipulating high-valent metal-oxo [M (IV)=O] species in a catalytic system is pivotal, however, it is challenging due to the inefficiency and unsustainability of M(IV)=O generation. In this research, Co2(OH)2CO3 (COC) were successfully prepared via a one-pot hydrothermal method to efficiently activate PMS with high-valent cobalt-oxo species [Co (IV)=O] as the primary active oxidation species. Building upon this foundation, COC was modified through variations in metal types (Fe, Cu, Ag, Mn) and elemental ratios, in which magnetically enriched FexCo2-x(OH)2CO3 (Fe-COC) was synthesized by gradient Fe doping with higher catalytic efficiency and stability. The insertion of Fe resulted in the lengthening of the Co-O bond and improved the valence distribution of cobalt on the COC surface. At the same time, it enabled part of the electrons to be transferred from the Fe active center to the Co active center, breaking the limitation of the traditional two-electron transfer and realizing the stable generation of more high-valent metals. Meanwhile, the performance and mechanism of the two catalysts (COC/PMS system and Fe-COC/PMS system) were comparatively analyzed, in which the contribution of singlet oxygen was second to high-valent metals while sulphate and hydroxyl radicals were rarely existed. Overall, the two groups of developed catalysts both showed remarkable stability and pollutant removal performance in anions (NO3-, Cl-, HCO3-, H2PO4-, HPO42-), humic acid (HA), Different antibiotics (SDM, SCP, STZ, ICP, TAP) and real water systems, which provided new perspectives on the generation of high valence metals for the treatment of persistent organic pollutants via the non-radical pathway and the application of alkali carbonates. © 2024, The Authors. All rights reserved.

关键词： Catalysts

Microplastics and Tcep Pollutants in Agricultural Soil: How Do They Disrupt Earthworm Homeostasis by Interfering with Their Metabolites and Gut Microbiota?

学校读者我要写书评

暂无评论

SSRN 2022年

作者： Cao, Jing Wang, Qian Lei, Yumeng Jiang, Xiaofeng Li, Mei State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing210023 China School of Environmental Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

Agricultural soil contamination with plastic film has become a critical global environmental problem, requiring greater research on the possible co-exposure effects of microplastics (MPs) and their additives in soil ecosystems. The presence of MPs and tris (2-chloroethyl) phosphate (Tcep) in agricultural soil was investigated at nine sites in this study. Polyethylene MPs (PE-MPs) and Tcep were found at all nine sites. To study co-exposure effects on soil microbiota and earthworms, and to model a more likely exposure situation, 0.05% (w/w) PE-MPs with three particle size ranges were combined with 1.0 mg/kg Tcep. After 28 days of exposure, there was no indication that added PE-MPs and/or Tcep significantly impacted the soil microbial community structure. In earthworm, size-selective intake, digestion, and egestion of PE-MPs may occur, and Tcep co-exposure affects the residual Tcep concentration in earthworm intestines (3.52–9.31 μg/g dw). Long-term earthworm PE-MPs intake caused intestinal damage, and Tcep co-exposure increased oxidative stress, thereby influencing their feeding behavior and growth, resulting in weight loss (3.42%–14.96%), especially for the most common PE-MPs sizes (0–300 μm). An LC-MS-based metabolomic analysis revealed significantly up-regulated citrate ( p © 2022, The Authors. All rights reserved.

关键词： Microplastic

Spherical-Like Mo2c/Znin2s4 Heterojunctions with Boosting Photo-Carriers Separation for Effective Tetracycline Removal in Water Via Synergistic Adsorption and Photocatalytic Process

学校读者我要写书评

暂无评论

SSRN 2022年

作者： Wu, Gang Liu, Fu Tian, Maoqing Deng, Xionghui Zhang, Xuxiang Ren, Hongqiang Geng, Jinju State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Jiangsu Nanjing210023 China Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment Ministry of Education Chongqing University Chongqing400044 China

The construction of novel heterojunction engineering is more favorable for boosting the photocatalytic performance of composite catalysts for emerging contaminants removal. Herein, a spherical-like Mo2C/ZnIn2S4 heterojunction was fabricated via a facile hydrothermal route and then applied as efficient photocatalyst for degrading tetracycline. Benefited from benign hetero-interface contact and large specific surface area, the prepared catalyst exhibited superior adsorption and photocatalytic activity for contaminants degradation under visible irradiation. Combining with radicals quenching tests and electron spin resonance characterization, the radicals and photo-generated holes were main responsible for tetracycline degradation. Moreover, the investigation results for the main degradation intermediates and the corresponding toxicity present that hydroxylation, dehydration, demethylation, deamination and hydrogenation reduction play major role in degradation process, and 8 transformation products may cause ecotoxicity. This work may provide a facile route for designing spherical-like heterostructured catalysts and shed light on sewage remediation by a synergistic adsorption/photocatalysis strategy. © 2022, The Authors. All rights reserved.

关键词： Adsorption

The combined effects of microplastics and their additives on mangrove system: From the sinks to the sources of carbon

学校读者我要写书评

暂无评论

Science of the Total Environment 2025年 959卷 178336页

作者： Guo, Junru Yang, Mingqing Huang, Ruohan Yu, Junyi Peng, Kaiming Cai, Chen Huang, Xiangfeng Wu, Qiaofeng Liu, Jia College of Environmental Science and Engineering Tongji University State Key Laboratory of Pollution Control and Resource Reuse Ministry of Education Key Laboratory of Yangtze River Water Environment Shanghai200092 China Fuzhou Urban and Rural Construction Group Company Limited Fuzhou350007 China Frontiers Science Center for Intelligent Autonomous Systems Shanghai200092 China Institute of Carbon Neutrality Tongji University Shanghai200092 China Fuzhou City Construction Investment Group Company Limited Fuzhou350014 China

Mangrove ecosystems, a type of blue carbon ecosystems (BCEs), are vital to the global carbon cycle. However, the combined effects of microplastics (MPs) and plastic additives on carbon sequestration (CS) in mangroves remain unclear. Here, we comprehensively review the sources, occurrence, and environmental behaviors of MPs and representative plastic additives in mangrove ecosystems, including flame retardants, such as polybrominated diphenyl ethers (PBDEs), and plasticizers, such as phthalate esters (PAEs). Mangrove ecosystems have a complex influence on the behaviors of MPs and additives. Under the action of natural and unnatural factors, these pollutants exhibit complex behaviors including migration, interception, deposition and transformation, that are closely linked to those of particulate carbon, particularly carbon sequestration processes. MPs and additives hinder the CS function of mangroves by harming the growth of flora and fauna, influencing microbial nitrogen and sulfur cycles, and enhancing the degradation of organic matter in the sediment. The increasing accumulation and widespread occurrence of MPs and additives will greatly influence the carbon cycle. Future work is encouraged on systematic investigation of new alternatives to plastics and additives, and research methods to uncover the impact mechanisms of MPs and additives on BCEs. The developments of management measures and engineering technologies are also required to enhance pollutant control and mangrove CS. © 2024 Elsevier B.V.

关键词： Carbon sequestration

In Vivo Relative Bioavailability of Perfluorooctanoic Acid (Pfoa) and its Alternative Hexafluoropropylene Oxide Trimer Acid (Hfpo-Ta): Influence of Food and Mechanisms Exploration

学校读者我要写书评

暂无评论

SSRN 2022年

作者： Cui, Xinyi Gu, Qian Juhasz, Albert Chen, Yi State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China Future Industries Institute University of South Australia Mawson LakesSA5095 Australia

The extensive use of perfluorooctanoic acid (PFOA), and its substitute hexafluoropropylene oxide trimer acid (HFPO-TA) has resulted in their frequent detection in environmental and biological samples. However, little is known of their bioavailability via oral ingestion and the influence of food co-ingestion on absorption. Here, the relative bioavailability (RBA) of PFOA and HFPO-TA in soil was measured using an in vivo mouse model in the presence of food with different nutritional status (n = 11). PFOA and HFPO-TA RBA in soil was variable depending on nutrient co-administration, ranging from 29.8-95.5% and 43.9-68.0%, respectively. For both PFOA and HFPO-TA, a significantly negative correlation was observed between RBA and protein content in food (r = 0.57-0.72), while a positive correlation was observed with carbohydrate content (r = 0.51-0.57). Mechanistic studies showed that protein in food decreased PFOA and HFPO-TA RBA by down-regulating the expression of FABP1 and up-regulating the expression of Mrp4 in the liver, which are responsible for the absorption and efflux of PFOA and HFPO-TA. Dietary carbohydrates promoted albumin synthesis and up-regulated FABP1 expression thereby enhancing absorption and increasing PFOA and HFPO-TA RBA. This study provides an insight into potential dietary strategies for reducing exposure to per- and polyfluoroalkyl substances. © 2022, The Authors. All rights reserved.

关键词： Oligomers

Spatial Distribution and Risk Assessment of Pyrethroid Insecticides in Surface Waters of East China Sea Estuaries

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Wang, Rui Cai, MingHong Wang, Feng Zhang, Shengwei Guo, Dongdong Zheng, Hongyuan Ministry of Natural Resources Key Laboratory for Polar Science Polar Research Institute of China 451 Jinqiao Road Shanghai200136 China State Key Laboratory of Marine Pollution Department of Chemistry City University of Hong Kong 999077 Hong Kong State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China School of Oceanography Shanghai Jiao Tong University 1954 Huashan Road Shanghai200030 China Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard School of Environment Beijing Jiaotong University Beijing100044 China

Pyrethroid insecticides are the most commonly used household insecticides and pose substantial risks to marine aquatic organisms. Although many studies have focused on detecting pyrethroid insecticides in the waters and estuaries of the western United states, their distributions within western Pacific estuaries have not been reported. Accordingly, in this study, we used high-throughput organic analyses combined with high volume solid-phase extraction to comprehensively assess 13 pyrethroid insecticides in East China Sea estuaries and Huangpu River. The results demonstrated the presence of various ∑13pyrethroid insecticides in East China Sea estuaries (mean and median values of 8.45 ± 5.57 and 7.78 ng·L-1, respectively), among which cypermethrin is the primary contaminant. The concentrations of ∑12pyrethroid insecticide detected in the surface waters at the Huangpu River (mean 6.70 ng·L-1, outlet 16.4 ng·L-1) were higher than those in the Shanghai estuary (4.70 ng·L-1), suggesting that runoff from inland areas is a notable source of insecticides. Wetlands were found to reduce the amount of runoff containing pyrethroid insecticides that reached the ocean. Several factors influenced pesticide distributions in East China Sea estuaries, and higher proportions were derived from agricultural sources than from urban sources. Permethrin and cypermethrin were the main compounds contributing to a high ecological risk in the estuaries. Consequently, to prevent risks to marine aquatic life, policymakers should aim to reduce insecticide contaminants derived from urban and agricultural sources. © 2023, The Authors. All rights reserved.

关键词： Estuaries