检索结果-南通市图书馆

Fate and removal of typical pharmaceutical and personal care products in a wastewater treatment plant from beijing： a mass balance study

引用

Frontiers of Environmental Science & Engineering 2016年第3期10卷 491-501页

作者： Jie GAO Jun HUANG Weiwei CHEN Bin WANG Yujue WANG Shubo DENG Gang YU State key Joint laboratory of Environment Simulation and Pollution control (SKJLESPC) Beijing Key Laboratory of Emerging Organic Contaminants Control (BKLEOCC) School of Environment Tsinghua University Beijing 100084 China beijing Municipal Solid Waste and Chemical Management Center Beijing 100084 China Xiamen Urban Planning and Design Institute Xiamen 361012 China

The fate and removal of pharmaceuticals and personal care products （PPCPs） in wastewater treatment plants （WWTPs） has received great attention during the last decade. Numerous data concerning concentrations in the water phase can be found in the literature, however corresponding data from sludge as well as associated mass balance calculations are very limited. In the present study, the adsorbed and dissolved concentrations of 9 PPCPs were investigated in each unit of a WWTP in beijing, China. Based on the calculation of mass balance, the relative mass distribution and removal efficiency of each target compound was obtained at each process. The amount of PPCPs entering into the WWTP ranged from 12 g·d^-1 to 3848 g·d^-1. Five target compounds （caffeine, chloramphenicol, bezafibrate, clofibric acid, and N,N- diethyl-meta-toluamide） were effectively removed, with rates of 57%-100%. Negative removal efficiencies were obtained for sulpiride, metoprolol, nalidixic acid, and carbamazepine, ranging from -19% to -79%. PPCPs mainly existed in dissolved form （≥92%） in both the raw influent and the final effluent. The sludge cake carried a much lower amount of PPCPs （17 g·d^-1） compared with the discharged effluent （402 g·d^-1）. In A^2/O treatment tanks, the anaerobic and anoxic tanks showed good performance for PPCPs removal, and the amount of adsorbed PPCPs was increased. The results reveal that both the dissolved and the adsorbed phases should be considered when assessing the removal capacity of each A^2/O tank.

关键词： PPCPs A^2/O mass balance removal efficiency sludge

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Influence of introducing Zr,Ti,Nb and Ce elements on externally solidified crystals and mechanical properties of high-pressure die-casting Al–Si alloy

引用

International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 147-153页

作者： Junjie Li Wenbo Yu Zhenyu Sun Weichen Zheng Liangwei Zhang Yanling Xue Wenning Liu Shoumei Xiong Center of Materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Traffic&Transportation Engineering Central South UniversityChangsha 410075China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

High pressure die casting(HPDC)AlSi10Mn Mg alloy castings are widely used in the automobile *** can optimize the mechanical properties of castings through heat treatment,while the release of thermal stress arouses the deformation of large integrated ***,the development of non-heat treatment Al alloys is becoming the hot *** addition,HPDC contains externally solidified crystals(ESCs),which are detrimental to the mechanical properties of *** achieve high strength and toughness of non-heat treatment die-casting Al-Si alloy,we used AlSi9Mn alloy as matrix with the introduction of Zr,Ti,Nb,and *** influences on ESCs and mechanical properties were systematically investigated through three-dimensional reconstruction and thermodynamic *** results reveal that the addition of Ti increased ESCs'size and porosity,while the introduction of Nb refined ESCs and decreased ***,large-sized Al_3(Zr,Ti)phases formed and degraded the mechanical *** introduction of Ce resulted in the poisoning effect and reduced mechanical properties.

关键词： aluminium alloy high-pressure die-casting externally solidified crystals non-heat treatment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

emerging progress: photochemical transformation of nitroso compounds

引用

Science China Chemistry 2025年第1期68卷 118-133页

作者： Ze-Le Chen Qiang-Qiang Li Armido Studer Jun Xuan Anhui Province key laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials School of Chemistry & Chemical Engineering Anhui University Organisch-Chemisches Institut Universitat Münster

Nitroso compounds have emerged as highly valuable reaction partners or reagents in organic synthesis due to their rich *** versatile profile of these compounds allows them to function as electrophiles, nucleophiles, diradicals, and radical acceptors in diverse transformations. In recent years, notable progress has been made in harnessing photochemical reactions with nitroso compounds to prepare N,O-containing structures using mild and eco-friendly conditions. Various nitroso compounds like nitrosoarenes, acyloxy nitroso compounds, N-nitrosoamines and nitrites have received significant attention for their ability to introduce NO moieties into complex molecules that are otherwise difficult to access. In this review, we provide an overview of the recent advancements in the visible light-induced conversion of nitroso compounds, with particular emphasis on their role as bifunctional reagents and acceptors of radicals, carbenes and nitrenes.

关键词： nitroso compounds photochemistry radical reaction carbene transformation nitrosoarenes

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Effects of carbon content on the microstructure and tensile properties of a low-density steel

引用

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 391-401页

作者： Yongxuan Shang Mingyu Fan Shuyong Jiang Zhongwu Zhang key laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China State key laboratory of Metal Material for Marine Equipment and Application Iron&Steel Research Institute of Ansteel Group CorporationAnshan 114009China

Carbon can change the phase components of low-density steels and influence the mechanical *** this study,a new method to control the carbon content and avoid the formation ofδ-ferrite by decarburization treatment was *** microstructural changes and mechanical characteristics with carbon content induced by decarburization were systematically ***-Jaoul(C-J)analysis was employed to examine the work hardening characteristics during the tensile *** decarburization by heat treatments,the carbon content within the austenite phase decreased,while Mn and Al were almost unchanged;this made the steel with full austenite transform into the austenite and ferrite dual ***,(Ti,V)C carbides existed in both matrix phase and the mole fraction almost the *** addition,the formation of other carbides *** loss induced a decrease in strength due to the weakening of the carbon solid *** the steel with the single austinite,the deformation mode of austenite was the dislocation planar glide,resulting in the formation of *** the dual-phase steel,the deformation occurred by the dislocation planar glide of austenite first,with the increase in strain,the cross slip of ferrite took place,forming dislocation cells in *** the late stage of deformation,the work hardening of austinite increased rapidly,while that of ferrite increased slightly.

关键词： low-density steels carbon content decarburization strengthening mechanisms work hardening behavior

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis of chiral phosphine derivatives through a copper（I）-catalyzed desymmetric SNAr reaction

引用

Science China Chemistry 2025年

作者： Shuai Zhang Pei-Zhi Liu Yan-Bo Li Qi Zhang Jun-Zhao Xiao Yi-Fan Wang Tian-Yu Wei Jia-Wei Jiang Ye Wang Qian Peng Liang Yin key laboratory of Fluorine and Nitrogen Chemistry and Advanced Materials Shanghai Institute of Organic Chemistry University of Chinese Academy of Sciences Chinese Academy of Sciences State key laboratory of Elemento-Organic Chemistry and Tianjin key laboratory of Biosensing and Molecular Recognition College of Chemistry Frontiers Science Center for New Organic Matter Nankai University Haihe laboratory of Sustainable Chemical Transformations

Axially chiral phosphines are a class of extremely important ligands in asymmetric catalysis. Herein, an unprecedented copper（I）-catalyzed asymmetric SNAr reaction with HP（S）R2is uncovered, which delivers a series of axially chiral phosphine derivatives in high yields with excellent enantioselectivity. Furthermore, the diastereoselective reaction with the kinetic resolution of racemic HP（S）ArR proceeds smoothly, providing the products with moderate diastereoselectivity and excellent enantioselectivity. control experiments indicate that HP（S）Ph2is much more active than HPPh2and HP（O）Ph2as the pronucleophile in the present reaction. It is found that the SNAr reaction （the first SNAr） proceeds in a desymmetric manner, providing the desired chiral products while a continued SNAr reaction （the second SNAr） slightly occurs in a kinetic resolution manner in the present catalytic system, which enhances the ee of the desired chiral products. DFTcalculations support a concerted reaction pathway rather than a step-wise mechanism. Finally, axially chiral olefin-phosphines produced by the present method work as suitable ligands in Pdcatalyzed asymmetric allylic substitution with C-, N-, and O-nucleophiles and Rh-catalyzed asymmetric addition of arylboronic acid to benzil.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Enhancement of the degradation ability for organic pollutants via the synergistic effect of photoelectrocatalysis on a self-assembled perylene diimide (SA-PDI) thin film

引用

Science Bulletin 2019年第13期64卷 896-903页

作者： Hong Miao Jun Yang Guilong Peng Huiquan Li Yongfa Zhu Department of Chemistry Tsinghua UniversityBeijing 100084China School of Environment Beijing Key Laboratory for Emerging Organic Contaminants ControlState Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC)Tsinghua UniversityBeijing 100084China Anhui Provincical key laboratory for Degradation and Monitoring of Pollution of the Environment School of Chemistry and Materials EngineeringFuyang Normal UniversityFuyang 236037China

A self-assembled perylene diimide(SA-PDI)film was prepared on an indium-tin-oxide(ITO)substrate and acted as a photoanode for the photoelectrocatalytic(PEC)degradation of some emerging contaminants under visible light irradiation(λ>420 nm)and applied *** to the synergistic effect,the photocatalytic degradation rate by the SA-PDI film under visible light irradiation and an applied voltage of 2.1 V was 2.72 times and 14.5 times those of the PC and EC processes,*** visible light irradiation not only generated a promoting effect on electrocatalytic(EC)oxidation at potentials above1.2 V but also generated many more h+ for promoting the electrocatalytic oxidation of ***,an applied voltage above 1.2 V could effectively improve the separation rate of electrons from the SA-PDI electrodes to the Pt electrodes,and then,much more ·O2-and ·OH could be generated for improving the photocatalytic(PC)oxidation ***,the h+,·OH and ·O2-could improve the synergistic effect of phenol oxidation during the PEC ***,the SA-PDI film appeared to have satisfactory stability in the PEC *** SA-PDI film was also proven to be effective for two other contaminants,namely,2,4-dichlorophenol,and ciprofloxacin.

关键词： Photoelectrocatalytic oxidation PDI electrode Phenol Degradation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Construction Concept and Innovative Practices of Virtual Power Plants in Megacities Under Electricity Market Environment

引用

Dianwang Jishu/Power System Technology 2025年第1期49卷 103-112页

作者： Tang, Jun Gao, Hongchao Yu, Tao Kang, Chongqing State Grid Shanghai Municipal Electric Power Company Pudong New Area Shanghai 200122 China National key laboratory of New Power System Operation and control [Tsinghua University Haidian District Beijing 100084 China

With the accelerated construction of new power systems, the Virtual Power Plant (VPP), a key component of the new energy framework, provides critical support for safe supply, energy conservation, and emission reduction for power systems. However, the increasingly diverse technological forms and application scenarios of VPPs present challenges for standardization in large-scale development. A timely summary and generalization of VPP development principles, construction pathways, and technical practices can promote technical synergy and drive industry growth. This paper takes the VPP in a megacity as a typical use case. It thoroughly discusses the top-level design of the VPP by reviewing and analyzing four perspectives of form, policy, market, and standards. Secondly, this paper examines a multi-spatiotemporal regulation technology system for VPPs from three dimensions precise response, regional coordination, and fast regulation, which supports the normalized operation of Shanghai’s VPP. Then, this paper introduces the large-scale demonstration outcomes of Shanghai’s VPP, offering a valuable reference for development constructions and innovative practices of VPPs at the megacity scale. Finally, by analyzing the construction and operational outlook of Shanghai's VPP, this paper distills a clear pathway for its future development. © 2025 Power System Technology Press. All rights reserved.

关键词： Virtual Power Plants

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Recent advances in pharmaceuticals and personal care products in the surface water and sediments in China

引用

Frontiers of Environmental Science & Engineering 2016年第6期10卷 29-40页

作者： Wentao Zhao Ying Guo Shuguang Lu Pingping Yan Qian Sui State key laboratory of Pollution control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai 200092 China State Environmental Protection key laboratory of Environmental Risk Assessment and control on Chemical Process School of Resources and Environmental Engineering East China University of Science and Technology Shanghai 200237 China beijing key laboratory for emerging Organic contaminants control Tsinghua University Beijing 100084 China

Pharmaceuticals and personal care products （PPCPs） have been regarded as an emerging problem in the surface water environment in the past few decades. In China, although related studies were initiated several years ago, an increasing number of studies on this topic have been conducted in recent years. These studies have expanded knowledge of their occurrence, behavior and associated risk in the surface water environment in China. This review compiles the most recent literature related to the studies of PPCPs in the surface water environment in China. It includes PPCP occurrence in surface water and sediments, their geographical distribution, and outcomes of the associated risk assessment. It shows that antibiotics have received much more attention in both surface water and sediments than other PPCPs. Compared to other countries; most antibiotics in the collected sediments in China showed higher contamination levels. Many more study areas have been covered in recent years; however, attention has been given to only specific areas. Environmental risk assessment based on risk quotients indicated that sulfamethoxazole presents the most significant environmental risk to relevant aquatic organisms; followed by ofloxacin, ciprofloxacin, enrofloxacin, 17α-ethynylestradiol, ibuprofen and diclofenac. Despite limited research on the environmental risk assessment of PPCPs in sediments, higher risks posed by PPCPs in the sediments rather than surfhce water were identified highlighting the need for further risk assessment of PPCPs in sediment samples.

关键词： Surface water Sediment Antibiotics Geographical distribution Risk assessment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Understanding and addressing the environmental risk of microplastics

引用

Frontiers of Environmental Science & Engineering 2023年第1期17卷 133-137页

作者： Han Qu Hongting Diao Jiajun Han Bin Wang Gang Yu College of Pharmacy The University of ArizonaTucsonAZ 85724USA beijing laboratory of Environmental Frontier Technology Beijing Key Laboratory of Emerging Organic Contaminants ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China Department of Applied Chemistry China Agricultural UniversityBeijing 100193China

Over the past decades,the plastic production has been dramatically ***,a category of small plastic particles mainly with the shapes of fragments,fibers,or spheres,called microplastics(particles smaller than 5 mm)and nanoplastics(particles smaller than 1μm)have attracted particular *** of its wide distribution in the environment and potential adverse effects to animal and human,microplastic pollution has been reported as a serious environment problem receiving increased attention in recent *** one of the commonly detected emerging contaminants in the environment,recent evidence indicates that the concentration of microplastics show an increasing trend,for the reason that up to 12.7 million metric tons of plastic litter is released into aquatic environment from land-based sources each ***,microplastic exposure levels of model organisms in laboratory studies are usually several orders of magnitude higher than those found in environment,and the microplastics exposure conditions are also different with those observed in the ***,the detection of microplastics in feces indicates that they can be excreted out of the bodies of animal and ***,great uncertainties might exist in microplastics exposure and health risk assessment based on current studies,which might be *** reduce microplastic emission sources and hence minimize their environmental risks are *** promote the above policies,we must first overcome the technical obstacles of detecting microplastics in various samples.

关键词： emerging contaminants Microplastics Environment risk Health effect

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Research on the deformation mechanism of flexural toppling deep-seated landslides based on large centrifuge physical model testing: A case study of the Genie landslide in the Tibetan Plateau

引用

Journal of Earth Science 2025年

作者： Shichao Cao Xiujun Dong Changbao Guo Ruian Wu Zhihua Yang Guang Zheng Xiaoqiang Zhu State key laboratory of Geohazard Prevention and Geoenvironment Protection， Chengdu University of Technology Institute of Geomechanics， Chinese Academy of Geological Sciences key laboratory of Active Tectonics and Geological Safety， Ministry of Natural Resources

Flexural toppling is a widespread failure mode in natural and excavated anti-inclined rock slopes of the eastern Tibetan Plateau， which can further evolve into large deep-seated landslides， posing significant threats to the construction and operation of important infrastructure. In this study， we took the large deep-seated Genie landslide as a case study and established a centrifuge physical model to analyze the deformation mechanism and evolutionary process of flexural toppling deep-seated landslides under the effect of gravity. The results indicate that the geomechanical mode of landslide instability is characterized by flexural toppling-shearing-sliding， with the deformation process could be divided into three stages: initial slow deformation stage marked by crack generation， rapid deformation stage characterized by the expansion and fracturing of cracks， and a low-speed deformation stage characterized by creep. Notably， the sliding surfaces do not adhere strictly to predefined bending zones but develop cracks along the bending parts， which gradually expand and penetrate deeper， eventually forming multiple potential sliding surfaces. The analysis of the entire process deformation evolution of flexural toppling deep-seated landslides suggests that the rapid deformation stage is the optimal time to take action for landslide prevention and control. The study demonstrates that the shear strength also plays a key factor in the evolution of flexural toppling. The research reveals the deformation mechanism and evolutionary process of large deep-seated landslides in deep-cut canyon areas， providing valuable reference for the prediction， assessment， and prevention of such slopes and landslides.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：