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ZnFe_(2)O_(4)/BiVO_(4)Z-scheme heterojunction for efficient visible-light photocatalytic degradation of ciprofloxacin

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Frontiers of Chemical Science and Engineering 2023年第11期17卷 1728-1740页

作者： Beibei Wang Kejiang Qian Weiping Yang Wenjing An Lan-Lan Lou Shuangxi Liu Kai Yu MOE Key Laboratory of Pollution Processes and Environmental Criteria Tianjin Key Laboratory of Environmental Technology for Complex Transmedia PollutionCollege of Environmental Science and EngineeringNankai UniversityTianjin 300350China institute of New Catalytic materials Science School of Materials Science and EngineeringNational Institute of Advanced MaterialsNankai UniversityTianjin 300350Chin

A novel Z-scheme ZnFe_(2)O_(4)/BiVO_(4)heterojunction photocatalyst was successfully synthesized using a convenient solvothermal method and applied in the visible light photocatalytic degradation of ciprofloxacin,which is a typical antibiotic contaminant in wastewater.The heterostructure of as-synthesized catalysts was confirmed using X-ray diffraction,scanning electron microscopy,transmission electron microscopy and X-ray photoelectron spectroscopy characterizations.Compared with the singlephase counterparts,ZnFe_(2)O_(4)/BiVO_(4)demonstrated considerably enhanced photogenerated charge separation efficiencies because of the Z-scheme transfer mechanism of electrons between the composite photocatalysts.Consequently,the 30%ZnFe_(2)O_(4)/BiVO_(4)catalyst afforded a degradation rate of up to 97%of 20 mg/L ciprofloxacin under 30 min of visible light irradiation with a total organic carbon removal rate of 50%,which is an excellent activity compared with ever reported BiVO_(4)-based catalysts.In addition,the liquid chromatography-mass spectrometry and quantitative structure-activity relationships model analyses demonstrated that the toxicity of the intermediates was lower than that of the parent ciprofloxacin.Moreover,the as-synthesized ZnFe_(2)O_(4)/BiVO_(4)heterojunctions were quite stable and could be reused at least four times.This study thus provides a promising Z-scheme heterojunction photocatalyst for the efficient removal and detoxication of antibiotic pollutants from wastewater.

关键词： ZnFe_(2)O_(4)/BiVO_(4) Z-scheme heterojunction photocatalytic degradation ciprofloxacin

Effect of Powder Particle Shape on the Properties of In Situ Ti–TiB Composite materials Produced by Selective Laser Melting

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Journal of materials Science & Technology 2015年第10期31卷 1001-1005页

作者： Hooyar Attar Konda G.Prashanth Lai-Chang Zhang Mariana Calin Ilya V.Okulov Sergio Scudino Chao Yang Jürgen Eckert School of Engineering Edith Cowan University IFW Dresden Institute for Complex Materials TU Dresden Institute of Materials Science National Engineering Research Center of Near-Net-Shape Forming for Metallic materials South China University of Technology

This work studied the preparation of starting powder mixture influenced by milling time and its effect on the particle morphology （especially the shape） and, consequently, density and compression properties of in situ Ti-TiB composite materials produced by selective laser melting （SLM） technology. Starting powder composite system was prepared by mixing 95 wt% commercially pure titanium （CP-Ti） and 5 wt% titanium diboride （TiB2） powders and subsequently milled for two different times （i.e. 2 h and 4 h）. The milled powder mixtures after 2 h and 4 h show nearly spherical and irregular shape, respectively. Subsequently, the resultant Ti-5 wt% TiB2 powder mixtures were used for SLM processing. Scanning electron microscopy image of the SLM-processed Ti-TiB composite samples show needle-shape TiB phase distributed across the Ti matrix, which is the product of an in-situ chemical reaction between Ti and TiB2 during SLM. The Ti-TiB composite samples prepared from 2 h and 4 h milled Ti-TiB2 powders show different relative densities of 99.5% and 95.1%, respectively. Also, the compression properties such as ultimate strength and compression strain for the 99.5% dense composite samples is 1421 MPa and 17.8%, respectively, which are superior to those （883 MPa and 5.5%, respectively） for the 95.1% dense sample. The results indicate that once Ti and TiB2 powders are connected firmly to each other and powder mixture of nearly spherical shape is obtained, there is no additional benefit in increasing the milling time and, instead, it has a negative effect on the density （i.e. increasing porosity level） of the Ti-TiB composite materials and their mechanical properties.

关键词： Selective laser melting In situ Ti-TiB composite Powder shape Density Mechanical properties

Plastic Flow of a Cu_(50)Zr_(45)Ti_5 Bulk Metallic Glass Composite

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Journal of materials Science & Technology 2014年第6期30卷 609-615页

作者： G.Wang S.Pauly S.Gorantla N.Mattern J.Eckert Laboratory for Microstructures Shanghai University IFW-Dresden Institute for Complex Materials Helmholtzstr. 20D-01069 Dresden Germany TU Dresden Institute of Materials ScienceD-01062 Dresden Germany

By modifying the cooling rate, a Cu50Zr45Ti5 alloy with various structures was developed. A fully glassy rod and specimens with different sizes and volume fractions ofnanocrystals were produced. The relationship between the structure and mechanical properties of the Cu50Zr45Ti5 alloy was investigated. The different structures result in a transition of the deformation mechanism from being dominated by shear banding to being governed by dislocation action accompanied by shear band formation. These different plastic deformation mechanisms were discussed in the framework of self-organized critical behavior.

关键词： Bulk metallic glass Plasticity Self-organized critical behavior Bulk metallic glass composite

通过侧链工程提高A-D-A'-D-A型非稠环电子受体的光伏性能（英文）

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Science China materials 2024年第5期67卷 1594-1601页

作者：周霞魏文魁庞淑婷袁熙越李俊宇黄飞曹镛段春晖 School of New Energy Ningbo University of Technology institute of Polymer Optoelectronic materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology Molecular materials and Nanosystems&institute for complex Molecular Systems Eindhoven University of Technology

非稠环电子受体(NFREA)具有合成简单和结构修饰灵活的特点,是制备高性能低成本有机太阳电池(OSCs)的理想材料.本工作以不同侧链修饰的二氟苯并三氮唑(ffBTz)作为弱缺电子核(A’),分别设计合成了三种A-D-A’-D-A型NFREA,即ffBTz-BO、ffBT... 详细信息

非稠环电子受体(NFREA)具有合成简单和结构修饰灵活的特点,是制备高性能低成本有机太阳电池(OSCs)的理想材料.本工作以不同侧链修饰的二氟苯并三氮唑(ffBTz)作为弱缺电子核(A’),分别设计合成了三种A-D-A’-D-A型NFREA,即ffBTz-BO、ffBTz-EH和ffBTz-C4.其中,ffBTz-EH,由于其合适的侧链长度,在分子结晶度和分子堆积优势取向之间取得了平衡,从而获得了更高的电荷迁移率.并且得益于高效的电荷传输和最合适的相分离形貌,基于ffBTz-EH的OSC获得12.96%的最高能量转换效率,这也是A-D-A’-D-A型NFREA获得的最高效率之一.本研究表明,A’核心上的烷基侧链在调节分子结晶度、活性层形貌和进一步调控器件性能方面起着至关重要的作用,这为未来设计高效低成本的A-D-A’-D-A型非稠环电子受体提供了思路.

关键词： organic solar cells non-fused ring electron acceptors side chain engineering molecular orientation power conversion efficiency

Synergistic effect of organic and inorganic nano fillers on the dielectric and mechanical properties of epoxy composites

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Journal of materials Science & Technology 2018年第12期34卷 2424-2430页

作者： Muhammad Khan Aqeel A.Khurram Tiehu Li Tingkai Zhao T.Subhani I.H.Gul Zafar Ali Vivek Patel Shaanxi Engineering Laboratory for Graphene New Carbon materials and Applications School of Materials Science and EngineeringNorthwestern Polytechnical University Laboratory for Advance materials Processing NCP ComplexIslamabadPakistan Department of materials Science and Engineering Institute of Space Technology School of Chemical and materials Engineering NUSTIslamabadPakistan

Titanium oxide TiO;/epoxy and TiO;with detonation nano-diamond（DND）/epoxy nanocomposites were prepared by using ultrasonication method. TiO;and DND particles as reinforcement species and epoxy as matrix were used to produce nanocomposites. The addition of DND particles into TiO;/epoxy composite improved the dielectric and mechanical properties of nanocomposites in significant amount.The dielectric properties of TiO;-DND/epoxy nanocomposite demonstrated increase in permittivity and conductivity after addition of the DND particles. The maximum and minimum reflection losses of TiO;-DND/epoxy nanocomposite for 0.6 and 0.2 wt% DND loading were detected at -14.5 and -1.3 dB,respectively. The flexural and tensile strength of TiO;-DND/epoxy nanocomposites with the addition of 0.4 wt% DNDs were enhanced to 220% and 223%, respectively. Additionally, the energy to break and percent break strain were 3.9 J and 3.86, respectively for 0.4 wt% DND loading in TiO;-DND/epoxy nanocomposite. Therefore, the present work findings claim that DND particles are well suitable to enrich the dispersion of TiO;nanoparticles in epoxy matrix, which develops a strong load transfer interface between the nanoparticles and epoxy matrix and consequently leads to superior properties.

关键词： Epoxy nanocomposite Dispersion Mechanical and dielectric properties

热处理状态对2195铝锂合金热变形行为及组织演变的影响

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Journal of Central South University 2023年第5期30卷 1417-1434页

作者：王睿琪戴国庆郭艳华孙中刚杨胶溪常辉刘春辉 Igor V.ALEXANDROV 湛利华 College of materials Science and Engineering Nanjing Tech UniversityNanjing 211816China institute of Laser Engineering Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China Light Alloy Research institute State Key Laboratory of High-performance Complex ManufacturingCentral South UniversityChangsha 410083China Department of materials Science and Physics of Metals Ufa University of Science and TechnologyUfa 450008Russia

2195铝锂合金在工业生产中应用广泛,不同的初始热处理状态影响其热变形行为。因此,本文旨在研究热处理状态对2195铝锂合金的组织演变和热变形行为的影响。实验在Gleeble-3800热模拟机上进行,温度范围为350~500℃,应变速率为0.01~10 s^(... 详细信息

2195铝锂合金在工业生产中应用广泛,不同的初始热处理状态影响其热变形行为。因此,本文旨在研究热处理状态对2195铝锂合金的组织演变和热变形行为的影响。实验在Gleeble-3800热模拟机上进行,温度范围为350~500℃,应变速率为0.01~10 s^(-1)。将热变形后各区域的微观组织进行对比,并计算出合金的本构模型和加工图。在较高的变形温度(400~500℃)下,T3和T8试样的峰值应力基本相同,同时发现热变形后合金中存在低角度晶界(LABs)和动态再结晶。由于固溶强化和形变强化作用,2195-T8铝锂合金表现出比2195-T3铝锂合金更大的形变激活能。本文确定2195-T3和2195-T8铝锂合金的最佳热加工条件均为475~500℃和0.01~0.1 s^(-1)。本文可为铝锂合金在后续热加工过程中设置热处理参数提供有益的帮助。

关键词： 2195铝锂合金热变形行为微观组织演变热处理状态

Mechanical behavior and deformation mechanism of shape memory bulk metallic glass composites synthesized by powder metallurgy

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Journal of materials Science & Technology 2022年第19期114卷 42-54页

作者： Tianbing He Tiwen Lu Daniel Sopu Xiaoliang Han Haizhou Lu Kornelius Nielsch Jürgen Eckert Nevaf Ciftci Volker Uhlenwinkel Konrad Kosiba Sergio Scudino Leibniz IFW Dresden Institute for Complex MaterialsHelmholtzstraße 2001069 DresdenGermany Guangdong Key Laboratory for Advanced Metallic materials Processing South China University of TechnologyGuangzhou 510640China Erich Schmid institute of materials Science Austrian Academy of SciencesJahnstraße 12Leoben A-8700Austria Leibniz IFW Dresden Institute for Metallic MaterialsHelmholtzstraße 2001069 DresdenGermany TU Dresden Institute of Materials Science01062 DresdenGermany TU Dresden Institute of Applied Physics01062 DresdenGermany Department materials Physics Montanuniversität LeobenJahnstraße 12A-8700 LeobenAustria Leibniz institute for materials Engineering IWT 28359 BremenGermany University of Bremen Faculty of Production Engineering28359 BremenGermany

The synthesis of martensitic or shape-memory bulk metallic glass composites(BMGCs)via solidification of the glass-forming melts requires the meticulous selection of the chemical composition and the proper choice of the processing parameters in order to ensure that the glassy matrix coexists with the desired amount of austenitic phase.Unfortunately,a relatively limited number of such systems,where austenite and glassy matrix coexist over a wide range of compositions,is available.Here,we study the effective-ness of powder metallurgy as an alternative to solidification for the synthesis of shape memory BMGCs.Zr_(48)Cu_(36)Al_(8)Ag_(8)matrix composites with different volume fractions of Ni_(50.6)Ti_(49.4)are fabricated using hot pressing and their microstructure,mechanical properties and deformation mechanism are investigated employing experiments and simulations.The results demonstrate that shape-memory BMGCs with tun-able microstructures and properties can be synthesized by hot pressing.The phase stability of the glass and austenitic components across a wide range of compositions allows us to examine fundamental as-pects in the field of shape memory BMGCs,including the effect of the confining stress on the martensitic transformation exerted by the glassy matrix,the contribution of each phase to the plasticity and the mechanism responsible for shear band formation.The present method gives a virtually infinite choice among the possible combinations of glassy matrices and shape memory phases,expanding the range of accessible shape memory BMGCs to systems where the glassy and austenitic phases do not form simul-taneously using the solidification route.

关键词： Metallic glass composites Niti alloys Mechanical properties Shear bands Martensitic transformation

Selective adsorption behavior of ion-imprinted magnetic chitosan beads for removal of Cu(Ⅱ) ions from aqueous solution

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Chinese Journal of Chemical Engineering 2021年第11期34卷 103-111页

作者： Licheng Ma Qi Zheng State Key Laboratory of Multiphase complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Rare Metals and Metallurgy materials Research institute General Research Institute for Nonferrous MetalsBeijing 100008China

Heavy metal ion is one of the major environmental pollutants.In this study,a Cu(Ⅱ)ions imprinted magnetic chitosan beads are prepared to use chitosan as functional monomer,Cu(Ⅱ)ions as template,Fe_(3)O_(4) as magnetic core and epichlorohydrin and glutaraldehyde as crosslinker,which can be used for removal Cu(Ⅱ)ions from wastewater.The kinetic study shows that the adsorption process follows the pseudosecond-order kinetic equations.The adsorption isotherm study shows that the Langmuir isotherm equation best fits for the monolayer adsorption processes.The selective adsorption properties are performed in Cu(Ⅱ)/Zn(Ⅱ),Cu(Ⅱ)/Ni(Ⅱ),and Cu(Ⅱ)/Co(Ⅱ)binary systems.The results shows that the ⅡMCD has a high selectivity for Cu(Ⅱ)ions in binary systems.The mechanism of ⅡMCD recognition Cu(Ⅱ)ions is also discussed.The results show that the ⅡMCD adsorption Cu(Ⅱ)ions is an enthalpy controlled process.The absolute value of DH(Cu(Ⅱ))and DS(Cu(Ⅱ))is greater than DH(Zn(Ⅱ),Ni(Ⅱ),Co(Ⅱ))and DS(Zn(Ⅱ),Ni(Ⅱ),Co(Ⅱ)),respectively,this indicates that the Cu(Ⅱ)ions have a good spatial matching with imprinted holes on ⅡMCD.The FTIR and XPS also demonstrates the strongly combination of function groups on imprinted holes in the suitable space position.Finally,the ⅡMCD can be regenerated and reused for 10 times without a significantly decreasing in adsorption capacity.This information can be used for further application in the selective removal of Cu(Ⅱ)ions from industrial wastewater.

关键词： Ion imprinted techniques Selective recognition Ion-imprinted magnetic chitosan beads Kinetic Thermodynamics

Synergistic protection of Si anode based on multi-dimensional graphitic carbon skeletons

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Nano Research 2022年第9期15卷 8146-8155页

作者： Qitao Shi Haiming Wang Junhua Zhou HuyQuang Ta Jiaqi Wang Xueyu Lian Klaudia Kurtyka Barbara Trzebicka Thomas Gemming Mark H.Rümmeli Soochow institute for Energy and materials Innovation College of EnergyKey Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215006China Institute for Complex Materials IFW Dresden20 Helmholtz StrasseDresden 01069Germany Centre of Polymer and Carbon materials Polish Academy of SciencesM.Curie-Sklodowskiej 34Zabrze 41-819Poland Thomas Gemming-institute of Environmental Technology VSB-Technical University of Ostrava17.Listopadu 15Ostrava 70833Czech Republic

Inspired by the natural corn structure,a Si@hollow graphene shell@graphene(Si@GS@G)anode material was prepared in which silicon nanoparticles were preliminarily anchored onto the surface of an elastic graphene shell and further constrained using graphene sheets.Hollow graphene oxide shells with abundant surficial hydrogen bonds,which were synthesized using a novel bottom-up method,were used as an intermediate material to anchor positively charged silicon nanoparticles via electrostatic attraction and achieve a rational spatial distribution.The inner hollow graphene shell anchorage and outer graphene constraint synergistically constituted a porous and robust conductive corn-like structure.The as-fabricated Si@GS@G anode afforded efficient electron and ion transport pathways and improved structural stability,thereby enhancing Li+storage capability(505 mAh·g^(−1)at 10 A·g^(−1))and extending the lifespan compared to the single hollow graphene shell or graphene sheet-protected Si anode(72%capacity retention after 500 cycles).The improved kinetics of the Si@GS@G anode were investigated using electro impedance spectroscopy,galvanostatic intermittent titration,and pseudocapacitance contribution rate analysis,and the structural evolution was analyzed using ex situ electron microscopy.This study proposes a novel hollow graphene oxide shell as an activated intermediate material for designing a porous electrode structure that facilitates an enhanced electrochemical performance.

关键词： synergistic protection multi-dimensional graphitic carbons corn-like structure elastic skeleton Si/C anode