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Construction of eco-friendly dual carbon dots ratiometric fluorescence probe for highly selective and efficient sensing mercury ion

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Journal of Environmental Sciences 2025年第2期148卷 1-12页

作者： Yongli Liu Xiaoyan Su Huanjia Liu Guifen Zhu Guobei Ge Yuxin Wang Penghui zhou qingxiang.zhou School of Environment Henan Key Laboratory for Environmental Pollution ControlKey Laboratory for Yellow River and Huai River Water Environmental and Pollution ControlMinistry of EducationHenan Normal UniversityXinxiang 453007China College of Chemical Engineering and Environment China University of Petroleum-BeijingBeijing 102249China

In present work,blue carbon dots(b-CDs)were derived from ammonium citrate and guanidine hydrochloride,and red carbon dots(r-CDs)were stemmed from malonate,ethylenediamine and meso-tetra(4-carboxyphenyl)porphin based on facile hydrothermal ***-friendly ratiometric fluorescence probe was innovatively constructed to effectively measure Hg2+utilizing b-CDs and *** developed probe displayed two typical emission peaks at 450 nm from b-CDs and 650 nm from r-CDs under the excitation at 360 *** ion has strong quenching effect on the fluorescence intensity at 450 nm due to the electron transfer process and the fluorescence change at 450 nm was used as the response signal,whereas the fluorescence intensity at 650 nm kept unchangeable which resulted from the chemical inertness between Hg^(2+)and r-CDs,serving as the reference signal in the sensing *** optimal circumstances,this probe exhibited an excellent linearity between the fluorescence response values of F450/F650 and Hg^(2+)concentrations over range of 0.01-10μmol/L,and the limit of detectionwas down to 5.3 nmol/***,this probe was successfully employed for sensing Hg^(2+)in practical environmental water samples with satisfied recoveries of 98.5%-105.0%.The constructed ratiometric fluorescent probe provided a rapid,environmental-friendly,reliable,and efficient platform for measuring trace Hg^(2+)in environmental field.

关键词： Blue carbon dots Red carbon dots Electron transfer Hg^(2+) Eco-friendliness

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Sensitive visual detection of norfloxacin in water by smartphone assisted colorimetric method based on peroxidase-like active cobalt-doped Fe_(3)O_(4) nanozyme

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Journal of Environmental Sciences 2025年第2期148卷 198-209页

作者： Linchun Nie Shuangying Li Xiaozhong Gao Shuai Yuan Guangyu Dong Guojin Tang Denghao Song Lutong Bu qingxiang.zhou College of Chemical Engineering and Environment China University of Petroleum-BeijingBeijing 102249China

Norfloxacin is widely used owing to its strong bactericidal effect on Gram-negative ***,the residual norfloxacin in the environment can be biomagnified via food chain andmay damage the human liver and delay the bone development *** work described a reliable and sensitive smartphone colorimetric sensing system based on cobaltdoped Fe_(3)O_(4) magnetic nanoparticles(Co-Fe_(3)O_(4) MNPs)for the visual detection of *** with Fe_(3)O_(4),Co-Fe_(3)O_(4) MNPs earned more remarkably peroxidase-like activity and TMB(colorless)was rapidly oxidized to oxTMB(blue)with the presence of H_(2)O_(2).Interestingly,the addition of low concentration of norfloxacin can accelerate the color reaction process of TMB,and blue deepening of the solution can be observed with the naked ***,after adding high concentration of norfloxacin,the activity of nanozymewas inhibited,resulting in the gradual fading of the *** on this principle,a colorimetric sensor integrated with smartphone RGB mode was *** visual sensor exhibited good linearity for norfloxacin monitoring in the range of 0.13-2.51μmol/L and 17.5-100μmol/*** limit of visual detectionwas 0.08μmol/*** the actualwater sample analysis,the spiked recoveries of norfloxacin were over the range of 95.7%-104.7%.These results demonstrated that the visual sensor was a convenient and fast method for the efficient and accurate detection of norfloxacin in water,which may have broad application prospect.

关键词： Nanozymes Cobalt-doped Fe3O4 magnetic nanoparticles Visual method Smartphone Norfloxacin

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磁性共价有机骨架材料富集检测典型有机污染物的应用进展

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色谱 2025年第2期43卷 107-119页

作者：姜刘杉周庆祥中国石油大学(北京)化学工程与环境学院北京102249

痕量污染物因其在环境中的微量存在和基质的复杂性,难以直接通过仪器进行检测,对人类的健康构成潜在威胁。磁性固相萃取(MSPE)技术因具有操作简单、成本低廉、富集效率高等优势,在样品前处理领域一直备受关注。磁性固相萃取的研究聚焦... 详细信息

痕量污染物因其在环境中的微量存在和基质的复杂性,难以直接通过仪器进行检测,对人类的健康构成潜在威胁。磁性固相萃取(MSPE)技术因具有操作简单、成本低廉、富集效率高等优势,在样品前处理领域一直备受关注。磁性固相萃取的研究聚焦于磁性材料的功能化,近年来研究者深入探索了磁性材料的功能化途径,将多种新兴材料引入磁性材料的修饰,有效拓展了磁性功能化材料的性能和应用领域。其中,磁性共价有机骨架材料(MCOFs)是一种具有代表性的材料,不仅具有比表面积大、稳定性高的特点,还兼具磁性材料的快速分离特性;可通过氢键作用、疏水作用、π-π共轭作用实现对目标物的快速、高效富集。本文重点综述了MCOFs的种类、合成方法及其在富集检测农药、内分泌干扰物(EDCs)及药物和个人护理产品(PPCPs)中的应用,并对该领域未来研究的发展方向进行了展望。

关键词：磁性固相萃取磁性共价有机骨架材料农药内分泌干扰物药物及个人护理产品综述

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Drag reduction of turbulent channel flows over an anisotropic porous wall with reduced spanwise permeability

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Applied Mathematics and Mechanics(English Edition) 2019年第7期40卷 1041-1052页

作者： qingxiang LI Ming PAN Quan zhou Yuhong DONG Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai University Shanghai 200072 China

The direct numerical simulation (DNS) is carried out for the incompressible viscous turbulent flows over an anisotropic porous wall. Effects of the anisotropic porous wall on turbulence modifications as well as on the turbulent drag reduction are investigated. The simulation is carried out at a friction Reynolds number of 180, which is based on the averaged friction velocity at the interface between the porous medium and the clear fluid domain. The depth of the porous layer ranges from 0.9 to 54 viscous units. The permeability in the spanwise direction is set to be lower than the other directions in the present simulation. The maximum drag reduction obtained is about 15.3% which occurs for a depth of 9 viscous units. The increasing of drag is addressed when the depth of the porous layer is more than 25 wall units. The thinner porous layer restricts the spanwise extension of the streamwise vortices which suppresses the bursting events near the wall. However, for the thicker porous layer, the wall-normal fluctuations are enhanced due to the weakening of the wall-blocking effect which can trigger strong turbulent structures near the wall.

关键词： direct numerical simulation (DNS) anisotropic porous medium drag reduction turbulent open channel flow

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Monodisperse amino-modified nanosized zero-valent iron for selective and recyclable removal of TNT: Synthesis, characterization, and removal mechanism

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Journal of Environmental Sciences 2021年第5期33卷 69-79页

作者： Jing Li qingxiang.zhou Miao Li Yongli Liu Qinan Song School of Environment Tsinghua UniversityBeijing 100084China State Key Laboratory of Heavy Oil Processing State Key Laboratory of Petroleum Pollution ControlCollege of Chemical Engineering and EnvironmentChina University of Petroleum BeijingBeijing 102249China School of Environment Henan Normal UniversityXinxiangHenan 453007China

Nitroaromatic explosives are major pollutants produced during wars that cause serious environmental and health problems. The removal of a typical nitroaromatic explosive, 2,4,6-trinitrotoluene(TNT), from aqueous solution, was conducted using a new recyclable magnetic nano-adsorbent(Fe@SiO_(2) –NH_(2)). This adsorbent was prepared by grafting amino groups onto Fe@SiO_(2) particles with a well-defined core-shell structure and demonstrated monodispersity in solution. The removal performance of the nano-adsorbent towards TNT was found to be 2.57 and 4.92 times higher than that towards two analogous explosives, 2,4-dinitrotoluene(2,4-DNT) and 2-nitrotoluene(2-NT), respectively, under neutral conditions. The difference in the removal performance among the three compounds was further compared in terms of the effects of different conditions(pH value, ionic strength, humic acid concentration, adsorbent modification degree and dosage, etc.) and the electrostatic potential distributions of the three compounds. The most significant elevation is owing to modification of amino on Fe@SiO_(2) which made a 20.7% increase in adsorption efficiency of TNT. The experimental data were well fit by the pseudo-second-order kinetic model and the Freundlich adsorption isotherm model, indicating multilayer adsorption on a heterogeneous surface. The experimental results and theoretical considerations show that the interactions between Fe@SiO_(2) –NH_(2) NPs and TNT correspond to dipole-dipole and hydrophobic interactions. These interactions should be considered in the design of an adsorbent. Furthermore, the adaptability to aqueous environment and excellent regeneration capacity of Fe@SiO_(2) –NH_(2) NPs makes these remediation materials promising for applications.

关键词： Nanosized zero-valent iron particles(NZVIs) 2 4 6-trinitrotoluene(TNT) Removal Mechanism Regeneration

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A comparison of the energy consumption and carbon emissions for different modes of transportation in open-cut coal mines

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International Journal of Mining Science and Technology 2015年第2期25卷 261-266页

作者： Liu Fuming Cai qingxiang Chen Shuzhao zhou Wei School of Mines China University of Mining & Technology State Key Laboratory of Coal Resources and Safe Mining China University of Mining & Technology

Transportation accounts for 80% of open-cut coal mine carbon emissions. With regard to the energy con- sumption and carbon emissions of transportation within an open-cut mine, this paper systematically compared the work and energy consumption of a truck and belt conveyor on a theoretical basis, and con- structed a model to calculate the energy consumption of open-cut mine transportation. Life cycle carbon emission factors and power consumption calculation model were established through a Process Analysis- Life Cycle Analysis （PA-LCA）. The following results were obtained：（1） the energy consumption of truck transportation was four to twelve times higher than that of the belt conveyor; （2） the C02 emissions from truck transportation were three to ten times higher than those of the belt conveyor; （3） with the increase in the slope angle for transportation, the ratio of truck to belt conveyor for both energy consumption and carbon emissions gradually decreased; （4） based on 2013 prices in China, the energy cost of transportation using a belt conveyor in open-cut coal mines could save 0.6-2.4 Yuan/（t kin） compared to truck transportation.

关键词： Open-cut coal mine Mode of transportation Energy efficiency Carbon emission calculation

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3D stability analysis method of concave slope based on the Bishop method

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International Journal of Mining Science and Technology 2017年第2期27卷 365-370页

作者： Zhang Tianwen Cai qingxiang Han Liu Shu Jisen zhou Wei School of Mines China University of Mining and TechnologyXuzhou 221116China Xiaolongtan Mining Administration Kaiyuan 661699China

In order to study the stability control mechanism of a concave slope with circular landslide, and remove the influence of differences in shape on slope stability, the limit analysis method of a simplified Bishop method was employed. The sliding body was divided into strips in a three-dimensional model, and the lateral earth pressure was put into mechanical analysis and the three-dimensional stability analysis methods applicable for circular sliding in concave slope were deduced. Based on geometric structure and the geological parameters of a concave slope, the influence rule of curvature radius and the top and bottom arch height on the concave slope stability were analyzed. The results show that the stability coefficient decreases after growth, first in the transition stage of slope shape from flat to concave, and it has been confirmed that there is a best size to make the slope stability factor reach a maximum. By contrast with average slope, the stability of a concave slope features a smaller range of ascension with slope height increase, which indicates that the enhancing effect of a concave slope is apparent only with lower slope heights.

关键词： Bishop method Concave slope Three-dimensional structure Stability analysis

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Design and structural characterization of autoinhibition-compromised full-length Ran

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Signal Transduction and Targeted Therapy 2021年第3期6卷 574-576页

作者： Yuping Tan Yuqing Zhang Qiao zhou Da Jia qingxiang Sun Department of Pathology State Key Laboratory of Biotherapy and Cancer CentreWest China HospitalSichuan University and Collaborative Innovation Centre of BiotherapyChengdu 610041China Key Laboratory of Birth Defects and Related Diseases of Women and Children Department of PaediatricsDivision of NeurologyWest China Second University HospitalSichuan UniversityChengdu 610041China

Dear Editor,The Ras-related nuclear protein Ran is a small GTPase that functions in nuclear transport,mitotic spindle formation,nuclear-envelope/nudear-pore complex assembly,and other diverse cytoplasmic activities.1,2 Unlike other Ras superfamily proteins,Ran contains a unique autoinhibitory C-terminal tail(C-tail)that accounts for an estimated tenfold lower affinity for GTP as compared with *** missense cancer mutations at the C-tail have been observed,but the biological significance is unknown.

关键词： nude structural characterization

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Tribological performance of hydrogenated diamond-like carbon coating deposited on superelastic 60NiTi alloy for aviation selflubricating spherical plain bearings

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Chinese Journal of Aeronautics 2022年第12期35卷 309-320页

作者： Yefei zhou Zhihao CHEN Zhonghui HU Lei LI qingxiang YANG Xiaolei XING College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Metastable Materials Science&Technology Yanshan UniversityQinhuangdao 066004China Aviation Key Laboratory of Science and Technology on Generic Technology of Self-Lubricating Spherical Plain Bearing Yanshan UniversityQinhuangdao 066004China AVIC the First Aircraft Institute Xi’an 710089China Northwest Institute for Nonferrous Metal Research Xi’an 710016China

It is imperative to develop a novel matching of metallic substrate and self-lubricating coating for aircraft spherical plain bearing in a wide range of service *** a new type of superelastic material,60NiTi alloy meets the performance requirements of aerospace bearing materials,but exhibits poor tribological performance,especially under the conditions of dry sliding friction.A Hydrogenated Diamond-Like Carbon(H-DLC)coating was deposited on the 60NiTi alloy to improve its tribological *** microstructure and mechanical behavior of the 60NiTi alloy and its H-DLC coating were *** show that improvement of friction and wear performance of the H-DLC coating deposited on the 60NiTi substrate is mainly achieved by graphitization at the friction interface and the transfer film produced on the counterpart *** increased friction load leads to intensification of graphitization at the friction interface and formation of continuous and compact transfer film on the surface of the counterpart ball.

关键词： 60NiTi Diamond-Like Carbon(DLC)coating Graphitization Transfer film Tribology

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Magnetic polyamidoamine dendrimers for magnetic separation and sensitive determination of organochlorine pesticides from water samples by high-performance liquid chromatography

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Journal of Environmental Sciences 2021年第4期33卷 64-73页

作者： qingxiang.zhou Yalin Wu Yi Sun Xueying Sheng Yayan Tong Jinghan Guo Boyao zhou Jingyi Zhao State Key Laboratory of Heavy Oil Processing China University of Petroleum-BeijingBeijing 102249China Beijing Municipal Research Institute of Environmental Protection Beijing 100037China

Organochlorine pesticides(OCPs)have received much attention due to their *** methods to monitor their residues in the environment are ***,magnetic polyamidoamine dendrimers were prepared by co-precipitation,Michael addition,and *** magnetic polyamidoamine dendrimers demonstrated good adsorption ability for OCPs—this feature was utilized to construct a sensitive tool for monitoring OCPs in water *** proposed method provided remarkable linearity from 0.1 to 500μg/L and satisfactory limits of detection from 0.012 to 0.029μg/*** spiked recoveries of the four target analytes were 91.8%-103.5%with relative standard deviations less than 4.5%.The magnetic materials had good *** results indicated that the resulting method was an efficient,easy,rapid,economical,and eco-friendly tool for monitoring OCPs in aqueous samples.

关键词： Organochlorine pesticides Magnetic PAMAM dendrimers Fe_(3)O_(4)nanoparticles

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