检索结果-内蒙古大学图书馆

engineering Pd Atom Membrane-Nanoparticle on Carbon Nitride for Efficient Photocatalytic Water Disinfection Via in Situ Generation and Activation of H2o2

SSRN

引用

SSRN 2024年

作者： Li, Minghui Jiang, Jian Zhu, Zhangqiang Fang, Caixia Liu, Chang Zhu, Hongjie Chen, Yan College of Ecology and Environment Anhui Normal University 189 South of Jiuhua Road Anhui Wuhu241002 China Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology School of Chemistry and Chemical Engineering Liaocheng University Liaocheng252059 China Department of Stomatology Nanjing First Hospital Nanjing Medical University Nanjing210000 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Jiangsu210023 China

Hydrogen peroxide (H2O2) used as water disinfectant has advantages of being green and free of disinfection byproducts, but remains challenging in production and performance. Herein, a Pd atom membrane-nanoparticle supported on carbon nitride nanotubes (PdAM-NP/CNNT) photocatalyst is prepared to enhance the visible-light-driven disinfection performance via in-situ generation and activation of H2O2. Our results indicate that complete inactivation of 9.4 log10 (cfu/mL) of Escherichia coli (E. coli) is achieved within 5 h in PdAM-NP/CNNT/visible light system, whereas only 2.4 log10 (cfu/mL) reduction is obtained in the same exogenous H2O2 condition. The reduction efficiency of PdAM-NP/CNNT (9.4 log10 (cfu/mL)) within 5 h is significantly higher than that of PdNP/CNNT (6.2 log10 (cfu/mL)) and CNNT (2.7 log10 (cfu/mL)). Therefore, a synergistic mechanism is proposed, in which the generation and activation of H2O2 by Pd atom membrane and nanoparticle are the major processes. The PdAM-NP structure can not only efficiently capture O2 molecules for oxygen reduction to H2O2, but facilitate robust H2O2 and O2 molecules activation. In disinfection process, oxidative species (h+, ·O2-, 1O2) can be produced, which cause the damage of outer membrane, and followed by cell death. Moreover, PdAM-NP/CNNT exhibits a broad-spectrum availability, anti-interference in natural waters and an excellent stability after four consecutive reaction cycles. Overall, this study provides the rational design of high-performance photocatalyst and highlights the significant potential of the PdAM-NP/CNNT photocatalysis system as an alternative green disinfection technology for purifying microbial-contaminated water. © 2024, The Authors. All rights reserved.

关键词： Escherichia coli

来源：评论

学校读者我要写书评

暂无评论

Study on a 48-Slot Interior Permanent Magnet Synchronous Motor in the Aircraft Drive System

Study on a 48-Slot Interior Permanent Magnet Synchronous Mot...

引用

Power and Electrical technology Conference (APET), Asia

作者： Yuhang Xie Fei Xiong Rui Yan Yu Xiang Kai Yang Weican Yan School of Reliability and Systems Engineering Beijing University of Aeronautics and Astronautics Beijing China State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan China Marketing Department SG Micro Corp Beijing China Wolong Electric Group Co. LTD Shangyu China

The torque performance of the interior permanent magnet synchronous motor (IPMSM) has been widely concerned and studied for many years. This article focuses on the structure design and optimization of the IPMSM in the aircraft drive system, and aiming to improve the torque density and reduce the torque ripple. Firstly, the original structure of the IPMSM is given. And then, a fractional slot winding and ∇-type rotor magnetic pole topology are proposed as the optimized IPMSM structure in this article. In addition, the comparison of the original and optimized structure is studied by the simulation. Finally, the performance of an optimized prototype is analyzed by experimental test, and the validity of the design optimization method for proposed IPMSM structure is verified.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Associations between prenatal exposure to metal mixtures and infant reproductive hormones during mini-puberty

引用

Science of the Total environment 2024年 955卷 177192页

作者： Yu, Ling Liu, Jiangtao Li, Ying Li, Shulan Cao, Shuting Li, Fasheng Li, Yuanyuan Liu, Hongxiu He, Zhenyu Xu, Shunqing Xia, Wei Key Laboratory of Environment and Health Ministry of Education & Ministry of Environmental Protection State Key Laboratory of Environmental Health School of Public Health Tong ji Medical College Huazhong University of Science and Technology Hubei Wuhan China Environmental Science and Engineering Hainan University Hainan Haikou China Shenzhen Institute of Advanced Technology The Chinese Academy of Sciences Shenzhen China Institute of Environmental Health Wuhan Centers for Disease Prevention &Control Hubei Wuhan430015 China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing100012 China

Background: The reproductive hormone homeostasis is crucial for child development. Exposure to metals during pregnancy may have adverse effects on offspring health. However, the association between prenatal exposure to metals and infant reproductive hormone levels remains unknown. Methods: This study involved 812 mother-infant pairs from Wuhan, China, assessing prenatal exposure to 13 metals in maternal plasma during early pregnancy and measuring five reproductive hormones in urine samples of one-month-old infants. Generalized linear models were employed to investigate the associations between individual metal exposures and urinary hormone levels in infants. Additionally, weighted quantile sum (WQS) regression and quantile g-computation were employed to evaluate the impact of metal mixtures. Results: Most of the detected metals in maternal plasma were associated with lower levels of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) in infants. Each interquartile range (IQR) increase in manganese (Mn), barium (Ba), thallium (Tl), vanadium (V), cobalt (Co), nickel (Ni), and lead (Pb) was significantly associated with an approximately 9.87 % to 38.24 % decrease in FSH or LH. WQS and quantile g-computation models confirmed a significant association between prenatal metal mixtures and reduced FSH and LH in male infants, and WQS indicated a significant association between metal mixtures and decreased FSH in female infants. Conclusions: Maternal exposure to mixed metals during early pregnancy was associated with lower levels of FSH and LH in infants, suggesting that prenatal exposure to metals may disrupt the balance of infant reproductive hormones. Further research is warranted to confirm these associations and explore the underlying mechanisms. © 2024 Elsevier B.V.

关键词： Birth cohort Heavy metal Mixture exposure Reproductive hormones

来源：评论

学校读者我要写书评

暂无评论

Study on the Influences of Hydraulic Fracturing in Steeply Inclined Coal Seam on the Fracture Initiation Pressure of Top Coal

SSRN

引用

SSRN 2023年

作者： Wang, Enmao Wang, Gang Huang, Qiming Liu, Qinhuai Zhang, Yanming Shandong University of Science and Technology Mine Disaster Prevention and Control-Ministry of State Key Laboratory Breeding Base Qingdao266590 China Shandong University of Science and Technology College of Safety and Environment Engineering Qingdao266590 China Shandong University of Science and Technology College of Energy and Mining Engineering Qingdao266590 China

The geological structure and stress distribution of a coal body directly determine its hydraulic fracture initiation pressure that is one of the key factors affecting the disaster prevention by hydraulic fracturing. Based on the geological structure characteristics of steeply inclined coal seam and the stress distribution characteristics, the influences of hydraulic fracturing on the top coal of steeply inclined coal seam were explored by a series of hydraulic fracturing experiments with varied bedding directions, triaxial stresses, and water injection rates and the presence/absence of temporary plugging balls in this study. The results show that the vertical stress is the minimum principal stress, and the horizontal stress is the maximum principal stress. The water injection pressure first maintains constant at 0 MPa, gradually increases, and then drops rapidly. The fracture initiation pressure shows no obvious relationship with the horizontal stress if the bedding direction is parallel to the water injection direction, but the node pressure increases with the increase of horizontal stress. If the bedding direction is perpendicular to the water injection direction, both fracture initiation pressure and node pressure gradually decrease with the increase of horizontal stress. The presence of temporary plugging balls increases the fracture initiation pressure if the bedding direction is same as the water injection direction, but reduces the secondary fracture initiation pressure if the directions are perpendicular. The fracture initiation pressures of steeply inclined coal seams are in the range of 10 MPa-21 MPa, much higher than those of horizontal coal seams. The results of this study help to understand the hydraulic fracture initiation pressure of steeply inclined coal seam, which is of great significance to the disaster control by hydraulic fracturing during the mining of steeply inclined coal seam. © 2023, The Authors. All rights reserved.

关键词： Hydraulic fracturing

来源：评论

学校读者我要写书评

暂无评论

Density functional theory(DFT) studies of vanadium-titanium based selective catalytic reduction(SCR) catalysts

引用

Journal of environmental Sciences 2020年第4期32卷 119-137页

作者： Ziwei Zhao Erwei Li Yu Qin Xiaolong Liu Yang Zou Heng Wu Tingyu Zhu National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China State Key Laboratory of Solid Waste Reuse for Building Materials Beijing Building Materials Academy of Science ResearchBeijing 100041China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China

Based on density functional theory(DFT)and basic structure models,the chemical reactions on the surface of vanadium-titanium based selective catalytic reduction(SCR)denitrification catalysts were *** structural models(non-periodic and periodic structural models)are the basis of density functional calculations.A periodic structure model was more appropriate to represent the catalyst surface,and its theoretical calculation results were more comparable with the experimental results than a nonperiodic *** is generally believed that the SCR mechanism where NH3 and NO react to produce N2 and H2 O follows an Eley-Rideal type ***2 NO was found to be an important intermediate in the SCR reaction,with multiple production ***,the effects of H2 O,SO2 and metal on SCR catalysts were also summarized.

关键词： Selective catalytic reduction(SCR) Structure model Vanadium-titanium based catalyst Density functional theory(DFT) Adsorption

来源：评论

学校读者我要写书评

暂无评论

Assessment of the In-Situ Electrogenerated Chloramines Damaging Polyamide Nf Membrane During Secondary Wastewater Treatment

SSRN

引用

SSRN 2023年

作者： Du, Xing Peng, Zhitian Lai, Caijing Xiao, Mengyao Yang, Yang Li, Xianhui School of Civil and Transportation Engineering Guangdong University of Technology Guangzhou510006 China Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education School of Ecology Environment and Resources Guangdong University of Technology Guangzhou510006 China Guangzhou511458 China Guangdong Provincial Key Laboratory of Water Quality Improvement and Ecological Restoration for Watersheds Institute of Environmental and Ecological Engineering Guangdong University of Technology Guangzhou510006 China

Nanofiltration (NF) membrane is susceptible to the chlorine damage in the treatment of secondary wastewater, thus it is critical to examine the structure changes of polyamide membrane in the environment exposed to chlorine. In this work, electro-oxidation (EO) process was utilized to pretreat the chlorine-containing secondary wastewater, and then the potential damage to polyamide membranes during the EO-NF process was assessed by the performance of NF90 nanofiltration membrane after exposure to the EO effluent. We observed a 90% reduction in the retention of Ca2+ and Mg2+ by NF membrane under high concentration of chloramine (i.e., 20 mg/L), which was attributed to the formation of N-chloramides resulting from the combination of chloramine with the lone electron pair of the polyamide. Compared with the pristine membrane directly exposed to the chloramine-containing EO effluent, the NF membrane deposited with a biofouling layer did not exhibit any changes of chemical structure and compositions, which could be explained by the layer blocking the chlorination of polyamide. Therefore, the biofouling layer formed by the deposition and development of microorganism on the membrane surface can prolong the lifetime of the polyamide membrane during the treatment of municipal wastewater in the EO-NF system. © 2023, The Authors. All rights reserved.

关键词： Amines

来源：评论

学校读者我要写书评

暂无评论

Low-Cost Separator with Dust-Free Fabric Composite Cellulose Acetate Toward Stable Dendrite-Free Aqueous Zinc-Ion Batteries

SSRN

引用

SSRN 2023年

作者： Lei, Yusheng Li, Qingning Liu, Qifan Zeng, Yanfei Li, Jia Huang, Wei Wang, Feisheng Zhong, Shengkui Yan, Dongliang Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology Guilin541004 China Guangxi Colleges Universities Key Laboratory of Environmental-friendly Materials and New Technology for Carbon Neutralization Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization School of Materials and Environment Guangxi Minzu University Nanning530105 China Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming650093 China College of Marine Science & Technology Hainan Tropical Ocean University Sanya572022 China

At present, the commonly used glass fiber (GF) separators in AZIBs possess many defects, such as lack zinophilic active sites, low electrical conductivity, poor mechanical strength, and high cost, which leading to the growth of dendrites and cause short circuits, thus resulting in deteriorated cyclic life. Herein, a novel CA@DF separator has been developed by coating molten blend of cellulose acetate (CA) and polyvinylidene fluoride (PVDF) on commercial dust-free fabric (DF) substrate and subsequent phase inversion. Due to the large number of active sites provided by the zinophilic -OH group derived from CA, more the nucleation sites of Zn2+ are offered by the as-obtained CA@DF separator, which leads to an uniform deposition of Zn2+ of preferred (002) crystallographic orientation. Furthermore, as-obtained CA@DF separator demonstrate not only high tensile strength of 23.08 MPa, which is 51 times of the GF separator but also improved Zn2+ migration number (τ) (0.58 for CA@DF vs. 0.31 for GF). Moreover, the CA@DF separator has cost with only 1/221 cost of GF separator. Impressively, the symmetric cell equipped with the CA@DF separator displays an ultralong lifespan of over 2000 h at 0.5 mA cm-2 and 1000 h at 3 mA cm-2. Specifically, the CA@DF separator also improves the cycling stability of the Zn//V2O5 cell with a reversible capacity of 78 mAh g-1 at 1A g-1 after 1000 cycles. This simple, reliable, and low-cost separator provides new insights into the design and industrial production of electrochemical energy storage device separators. © 2023, The Authors. All rights reserved.

关键词： Separators

来源：评论

学校读者我要写书评

暂无评论

Micro Characteristic of Metal Vapour Vacuum Arc

Micro Characteristic of Metal Vapour Vacuum Arc

引用

2020 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2020

作者： Chen, Hai Liu, Xiaoming Li, Peiyuan Zhang, Xusong Zhang, Yaqian Jiang, Wentao State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin China Tianjin Key Laboratory of Advanced Technology of Electrical Engineering and Energy Tiangong University Tianjin China School of Mechanical Engineering Tiangong University Tianjin Key Laboratory of Advanced Technology of Electrical Engineering and Energy Tianjin China

ISBN: (纸本)9781728152158

For analyzing the hybrid metal vapour arc characteristic parameters of the vacuum interrupter, the Eindhoven model was applied under local thermodynamic equilibrium condition. The thermodynamic parameters of metal vapour arc were calculated using statistical thermodynamic method, and the electrical conductivity was calculated using Chapman-Enskog method. Moreover the mass density, enthalpy, specific heat and electrical conductivity for different alloy proportions were compared and quantitatively characterized. © 2020 IEEE.

关键词： Binary alloys

来源：评论

学校读者我要写书评

暂无评论

Exploring Polystyrene Weathering Behavior: From Surface Traits to Micro(Nano)Plastics and Additives Release

SSRN

引用

SSRN 2024年

作者： Yang, Nina Zuo, Jiane Men, Cong Zhang, Yanyan Xie, Zhenwen State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Shenzhen International Graduate School Tsinghua University Shenzhen518055 China School of Energy and Environmental Engineering Beijing Key Laboratory of Resource-Oriented Treatment of Industrialpollutants University of Science and Technology Beijing Beijing100083 China Chengdu Xingrong Environment Co. Ltd Chengdu610041 China Chengdu Drainage Co. Ltd Chengdu610011 China

Plastic weathering in the natural environment is a dynamic and complex process, where the release of micro and nanoplastics, as well as additives, poses potential threats to ecosystems. Current research primarily focuses on the singular weathering actions of plastics;however, the release of micro and nanoplastics alongside additives often occurs concurrently under natural conditions. This study systematically explored these phenomena by exposing polystyrene (PS) to UV irradiation and mechanical agitation for different durations (1 day, 5 days, 10 days, 20 days). The results indicated a progressive increase in both the extent of polystyrene (PS) ageing and the abundance of carbonyl (C=O) functional groups throughout the weathering process. Notably, flake bulges and cracks emerged as characteristic features of PS weathering. A positive correlation was identified between the released micro(nano)plastics content and the extent of plastic ageing. Laser infrared and Raman tests indicated that microplastics originating from polystyrene (PS) within the 10-20 μm size range accounted for the largest fraction over time and remained relatively stable. Simultaneously, the proportions of 20 μm microplastics consistently approached parity, gradually increasing. In the later stage, the proportions of all three tended to equalize. The dominant size range of nanoplastics shifted towards smaller sizes over time, albeit with a certain limit. Twenty types of chemicals were detected, including bisphenol A (BPA), dibutyl phthalate (DBP) and Di(2-ethylhexyl) phthalate (DEHP), with antioxidant 168 showing the highest content. The release of plastic additives was influenced by a combination of ageing time, additive type, and quantity. This study provided a comprehensive overview of the plastic weathering process and practical information for managing plastic pollution in rivers. © 2024, The Authors. All rights reserved.

关键词： Polystyrenes

来源：评论

学校读者我要写书评

暂无评论

Spatial Confinement-Regulated Peroxymonosulfate Activation by Hollow Bimetallic Metal-Doped Carbon Spheres for Rapid Removal of Organic Pollutants

SSRN

引用

SSRN 2024年

作者： Li, Huanxuan Zhang, Xuhong Xu, Shaodan Zhou, Zhong Rao, Tao Huang, Jingang Wang, Chunhui Gao, Xing College of Materials and Environmental Engineering Hangzhou Dianzi University Hangzhou310018 China China Aerospace Planning and Design Group Co. Ltd. Zhejiang Branch Hangzhou310000 China Key Laboratory of Urban Environment and Health Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control CAS Haixi Industrial Technology Innovation Center in Beilun Ningbo315830 China

Non-radical advanced oxidation processes (AOPs) are increasingly recognized as an appealing alternative for the removal of persistent contaminants from water, effectively mitigating the impact of coexisting anions compared to traditional radical-based methods. Here, a singlet oxygen (1O2)-dominated process was developed for the degradation of metronidazole (MNZ), with hollow bimetallic metal-doped carbon spheres (CuCo-HCS) as catalysts and peroxymonosulfate (PMS) as oxidant. Experimental results indicated that 1O2 is the primary reactive species, with the hollow bimetallic doped carbon spheres promoting electron transfer processes and enhancing surface interactions through spatial confinement, while also regenerating Co(II) and Cu(I). This ultimately boosted the generation of 1O2 and the degradation of MNZ. The CuCo-HCS-4/PMS system achieves a 100% removal rate of MNZ within 5 minutes and a 70% mineralization rate within 30 minutes, with degradation rates 1.4-fold and 10-fold higher than those of the Co-HCS-4/PMS and Cu-HCS-4/PMS systems, respectively. CuCo-HCS-4 demonstrates excellent PMS utilization efficiency, good stability, and strong resistance to inorganic anions. This study provides new strategies and insights for the design of novel hollow catalysts and the mechanistic exploration of non-radical AOP pathways. © 2024, The Authors. All rights reserved.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：