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Fabrication of ni-Zn spinel ferrite with superior magnetic performance from electric arc furnace dust and iron scale

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Journal of Iron and Steel Research International 2025年第1期32卷 105-114页

作者： Yang Li Wei-zhe Jie Chang Chen Yi Su Wu Zhou Hua Zhang Hong-wei ni The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina The Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan430081HubeiChina Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking Wuhan University of Science and TechnologyWuhan430081HubeiChina

The ni-ZnFe_(2)O_(4)(nixZn_(1-x)Fe_(2)O_(4),x=0.4-0.7)spinel was synthesized using Zn2+extracted from electric arc furnace dust(EAFD),nickel chloride hexahydrate,and Fe^(3+)extracted from iron scale as raw *** zinc was selectively extracted from EAFD using CaO roasting followed by NH_(4)Cl solution *** ferric ion was leached from iron scale using HCl solution as acid *** experimental results demonstrate a high level of efficiency in the extraction of zinc,with a rate of 97.5%,and the leaching rate of ferric ion is 96.89%.The composition of the leaching solution is primary zinc and iron with low calcium,which is beneficial to the preparation of spinel *** influence of ni content(x)and calcination temperature on the synthesis and magnetic properties of nixZn_(1-x)Fe_(2)O_(4)compounds was investigated by X-ray diffraction,scanning electron microscopy,and vibrating sample *** results revealed that both ni content and calcination temperature significantly affect the synthesis and magnetic properties of spinel nixZn_(1-x)Fe_(2)O_(4).Under the conditions of ni content set at x=0.6,calcination temperature of 1100℃,and a duration of 2 h,a spinel nixZn_(1-x)Fe_(2)O_(4)with high saturation magnetization(Ms=65.7 A m2 kg-1)and low coercivity(Hc=0.056 A m^(-1))was obtained.

关键词： Electric furnace arc dust Iron scale Spinel ferrite Magnetic performance Calcination temperature

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MOF-derived ni3Fe/ni/niFe2O4@C for enhanced hydrogen storage performance of MgH2

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Journal of Energy Chemistry 2025年第2期101卷 333-344页

作者： Yangping Chen Bolin Sun Guoqing Zhang Siyuan ni Canbing Li Juxiong Tian Yanrui Zhang Xinxi Li School of Materials and Energy Guangdong University of Technology Shen Zhen Source Sensor Technology CO. Ltd Department of Electrical Engineering Shanghai Jiao Tong University China Power Investment Xinjiang Energy & Chemical Group Hotan Co.Ltd

Magnesium hydride（MgH2） is an important material for hydrogen（H2） storage and transportation owing to its high capacity and ***,its intrinsic properties have considerably limited its industrial *** this study,the niFe-800 catalyst as metal-organic framework（MOF） derivative was first utilized to promote the intrinsic properties of *** to pure MgH2,which releases1.24 wt% H2in 60 min at 275℃,the MgH2-10 niFe-800 composite releases 5.85 wt% H2in the same *** at a lower temperature of 250℃,the MgH2-10 niFe-800 composite releases 3.57 wt% H2,surpassing the performance of pure MgH2at 275℃.Correspondingly,while pure MgH2absorbs 2.08 wt% H2in60 min at 125℃,the MgH2-10 niFe-800 composite absorbs 5.35 wt% H2in just 1 min,Remarkably,the MgH2-10 niFe-800 composite absorbs 2.27 wt% H2in 60 min at 50℃ and 4.64 wt% H2at 75℃.This indicates that MgH2-10 niFe-800 exhibits optimum performance with excellent kinetics at low ***,the capacity of the MgH2-10 niFe-800 composite remains largely stable after ***,the Mg2ni/Mg2niH4acts as a "hydrogen pump",providing effective diffusion channels that enhance the kinetic process of the composite during ***,Fe0facilitates electron transfer and creates hydrogen diffusion channels and catalytic ***,carbon（C） effectively prevents particle agglomeration and maintains the cyclic stability of the ***,the synergistic effects of Mg2ni/Mg2niH4,Fe0,and C considerably improve the kinetic properties and cycling stability of *** work offers an effective and valuable approach to improving the hydrogen storage efficiency in the commercial application of MgH2.

关键词： Catalysts Hydrogen energy MgH2 MOF derivative Solid state storage

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Nucleophilic trifluoromethylation with CF_(3)H/LiHMDS: probing the nucleophilic reactivity of LiCF_(3) species

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Science China Chemistry 2025年第2期68卷 505-512页

作者： Yangfan Liu Xiu Wang Chuanfa ni Jinbo Hu College of Chemistry Central China Normal UniversityWuhan 430079China Key Laboratory of Fluorine and nitrogen Chemistry and Advanced Materials Shanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of SciencesShanghai 200032China

The nucleophilic trifluoromethylation involving trifluoromethyllithium(LiCF_(3))species has been an open question since Haszeldine attempted to prepare LiCF_(3) in ***,LiCF_(3) has been used for electrophilic difluoromethylene transfer processes(via elimination of fluoride ions)since ***,we demonstrated that by using a polar solvent such as dimethylformamide(DMF)or hexamethylphosphoramide(HMPA)as the lithium chelator,the in situ deprotonation of fluoroform(HCF_(3))with lithium hexamethyldisilazide(LiHMDS)could generate a tamed LiCF_(3) species that is sufficiently persistent to undergo nucleophilic trifluoromethylation *** nucleophilic reactivity of LiCF_(3) species was probed with several electrophiles,including arylsulfonyl fluorides,diaryl ketones,and silyl *** synthetic utility of this method is demonstrated with the efficient synthesis of highly valuable triflones that are otherwise difficult to synthesize from HCF_(3) using potassium or sodium *** work not only showcases a new protocol for the utilization of fluoroform(an industrial waste with high global warming potential)as the trifluoromethylation reagent,but also provides intriguing insights into the harnessing of nucleophilic reactivity of the transient LiCF_(3) species.

关键词： nucleophilic trifluoromethylation trifluoromethy llithium fluorinated carbanion negative fluorine effect fluorinated carbenoid

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On-chip light control of semiconductor optoelectronic devices using integrated metasurfaces

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Opto-Electronic Advances 2025年第1期8卷 5-30页

作者： Cheng-Long Zheng Pei-Nan ni Yi-Yang Xie Patrice Genevet Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Materials PhysicsMinistry of EducationSchool of PhysicsZhengzhou UniversityZhengzhou 450052China Key Laboratory of Optoelectronics Technology Beijing University of TechnologyMinistry of EducationBeijing 100124China Colorado School of Mines 1523 Illinois St.GoldenCO 80401USA

Semiconductor optoelectronics devices,capable of converting electrical power into light or conversely light into electrical power in a compact and highly efficient manner represent one of the most advanced technologies ever developed,which has profoundly reshaped the modern life with a wide range of *** recent decades,semiconductor technology has rapidly evolved from first-generation narrow bandgap materials(Si,Ge)to the latest fourth-generation ultra-wide bandgap semiconductor(GaO,diamond,AlN)with enhanced performance to meet growing ***,merging semiconductor devices with other techniques,such as computer assisted design,state-of-the-art micro/nano fabrications,novel epitaxial growth,have significantly accelerated the development of semiconductor optoelectronics *** them,integrating metasurfaces with semiconductor optoelectronic devices have opened new frontiers for on-chip control of their electromagnetic response,providing access to previously inaccessible degrees of *** review the recent advances in on-chip control of a variety of semiconductor optoelectronic devices using integrated metasurfaces,including semiconductor lasers,semiconductor light emitting devices,semiconductor photodetectors,and low dimensional *** integration of metasurfaces with semiconductors offers wafer-level ultracompact solutions for manipulating the functionalities of semiconductor devices,while also providing a practical platform for implementing cuttingedge metasurface technology in real-world applications.

关键词： optoelectronics nanophotonics metasurfaces semiconductor

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Phase equilibria of Fe_(3)O_(4)-Cr_(2)O_(3)-CaO system:experimental measurements and thermodynamic calculations

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Journal of Iron and Steel Research International 2025年第1期32卷 95-104页

作者： Ao Zhu Chen-ying Shi Pei-yuan ni Teng-fei Deng State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070HubeiChina College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083HunanChina Key Laboratory of Ecological Metallurgy of Multi-Metal Intergrown Ores of Education Ministry School of MetallurgyNortheastern UniversityShenyang 110819LiaoningChina

Understanding the phase equilibria of the Fe_(3)O_(4)-Cr_(2)O_(3)-CaO system is essential for the efficient recycling of stainless steel pickling *** isothermal section of this system at 1473 K under oxygen partial pressure of 0.15 Pa was *** experiments on the relevant binary systems were conducted using a combination of equilibrium-quenching techniques,X-ray diffraction,high-resolution transmission electron microscope,and electron probe *** systems were rigorously assessed using the CALPHAD(CALculation of Phase Diagram)method,incorporating the present experimental *** liquid phase was modeled using the ionic two-sublattice model,represented as(Ca^(2+),Cr^(3+),Fe^(2+))P(O_(2)^(-),Va,FeO_(1.5))Q,where Va represents vacancy,and P and Q denote the number of sites on the cation and anion sublattices,*** ensure electroneutrality,the values of P and Q adjust according to the composition of the *** this,the isothermal section of the Fe_(3)O_(4)-Cr_(2)O_(3)-CaO system at 1473 K under the specified oxygen partial pressure was obtained based on the thermodynamic parameters of the binary *** present experimental data and calculation results hold significant implications for the comprehensive recycling of stainless steel pickling sludge.

关键词： Fe_(3)O_(4)-Cr_(2)O_(3)-CaO system Ionic two-sublattice model Phase equilibria CALPHAD

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Grid-Connected/Islanded Switching Control Strategy for Photovoltaic Storage Hybrid Inverters Based on Modified Chimpanzee Optimization Algorithm

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Energy Engineering 2025年第1期122卷 265-284页

作者： Chao Zhou Narisu Wang Fuyin ni Wenchao Zhang School of Electrical and Information Engineering Jiangsu University of TechnologyChangzhou213001China Jiangsu Key Laboratory of Power Transmission&Distribution Equipment Technology Jiangsu University of TechnologyChangzhou213001China

Uneven power distribution,transient voltage,and frequency deviations are observed in the photovoltaic storage hybrid inverter during the switching between grid-connected and island *** response to these issues,this paper proposes a grid-connected/island switching control strategy for photovoltaic storage hybrid inverters based on the modified chimpanzee optimization *** proposed strategy incorporates coupling compensation and power differentiation elements based on the traditional droop ***,it combines the angular frequency and voltage amplitude adjustments provided by the phase-locked loop-free pre-synchronization control *** pre-synchronization is achieved by regulating the virtual current to zero and aligning the photovoltaic storage hybrid inverter with the grid ***,two novel operators,learning and emotional behaviors are introduced to enhance the optimization precision of the chimpanzee *** operators ensure high-precision and high-reliability optimization of the droop control parameters for photovoltaic storage hybrid inverters.A Simulink model was constructed for simulation analysis,which validated the optimized control strategy’s ability to evenly distribute power under load *** strategy effectively mitigated transient voltage and current surges during mode ***,seamless and efficient switching between gridconnected and island modes was achieved for the photovoltaic storage hybrid *** enhanced energy utilization efficiency,in turn,offers robust technical support for grid stability.

关键词： Photovoltaic storage hybrid inverters modified chimpanzee optimization algorithm droop control seamless switching

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Radical dehydroxymethylative fluorination of aliphatic primary alcohols and diverse functionalization ofα-fluoroimides via BF_(3)·OEt_(2)-catalyzed C-F bond activation

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Chinese Chemical Letters 2025年第1期36卷 239-243页

作者： Peng Wang Jianjun Wang ni Song Xin Zhou Ming Li Molecular Synthesis Center Key Laboratory of Marine MedicineChinese Ministry of EducationSchool of Medicine and PharmacyOcean University of ChinaQingdao 266003China Laboratory for Marine Drugs and Bioproducts Pilot National Laboratory for Marine Science and TechnologyQingdao 266237China

Ag_(2)CO_(3)-promoted dehydroxymethylative fluorination of aliphatic alcohols has been achieved with Selectfluor as both oxidant and fluorine *** reaction involvesβ-fragmentation of primary alkoxy radicals,followed by the fluorination of the resulting C-centered radical *** transformation proceeds under mild reaction conditions and exhibits a broad substrate scope,thus opening up a new entrance to the synthesis of fluorinated constructs includingα-fluoroimides and 1-fluoroalkyl benzoates as well as secondary and tertiary alkyl fluorides like versatile 2-fluoro-2-alkyl 1,3-propandiol *** divergent functionalization of the obtainedα-fluoroimides enables an efficient access to amine derivatives through C-F bond activation under the action of BF_(3)·OEt_(2).

关键词： Dehydroxymethylative fluorination Alkoxy radicals β-Fragmentation Silver catalysis C-F Bond activation

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Holocene ecological evolution of Tengchong Qinghai Lake responses to climate changes and human activities in Yunnan,southwestern China

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Science China Earth Sciences 2025年第2期68卷 498-508页

作者： Enlou ZHANG Wenxiu ZHENG Yanmin CAO Zhenyu ni Yanjie ZHAO Weiwei SUN Key Laboratory of Lake and Watershed Science for Water Security Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Nanjing 211135China College of Urban and Environmental Sciences Hubei Normal UniversityHuangshi 435002China College of Resources and Environment South-Central Minzu UniversityWuhan 430074China

Holocene climate change's impact on ecosystems has attracted considerable *** human activities increasingly influenced ecosystems during the Holocene,many paleo-records primarily reconstruct natural environmental changes,often neglecting the pre-instrumental human influenceon ecological *** understand ecosystem responses comprehensively,it is essential to consider anthropogenic impacts alongside natural ***,we present a Holocene chironomid record from Qinghai Crater Lake in Tengchong,southwestern China,examining the timing and magnitude of natural and anthropogenic impacts on the lake ecosystem throughout the *** results reveal that early to midHolocene chironomid communities,especially in terms of species richness,were mainly driven by rising summer temperatures associated with increased solar *** the late-Holocene,the weakening Indian Summer Monsoon led to fluctuating lake levels and intensified human impacts,impacting both chironomid species richness and community *** 0.8 ka BP,enhanced human disturbances shifted the chironomid community composition from mesotrophic taxa dominance(e.g.,Cladotanytasus,Macropelopia)to eutrophic taxa dominance(e.g.,Chironomus,Polypedilum).Over the past few centuries,human influence has further increased chironomid species richness but has led to declining community stability.

关键词： Holocene Chironomid community Climate change Human impact Ecological response Qinghai Crater Lake

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Charged functional groups modified porous spherical hollow carbon material as CDI electrode for salty water desalination

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Journal of Environmental Sciences 2025年第3期149卷 254-267页

作者： Yushan ni Yunlong Pu Jie Zhang Weiyan Cui Mingjun Gao Dongjiang You School of Environmental and Material Engineering Yantai UniversityYantai 264005China

As a new electrochemical technology,capacitive deionization(CDI)has been increasingly applied in environmental water treatment and seawater *** this study,functional groups modified porous hollow carbon(HC)were synthesized as CDI electrode material for removing Na^(+)and Cl^(−)in salty *** showed that the average diameter of HC was approximately 180 nm,and the infrared spectrum showed that its surface was successfully modified with sulfonic and amino groups,*** sulfonic acid functionalized HC(HC-S)showed better electrochemical and desalting performance than the amino-functionalized HC(HC–N),with a maximum Faradic capacity of 287.4 F/g and an adsorptive capacity of 112.97 mg/g for ***,92.63%capacity retention after 100 adsorption/desorption cycles demonstrates the excellent stability of *** main findings prove that HC-S is viable as an electrodematerial for desalination by high-performance CDI applications.

关键词： Hollow carbon Functional groups Desalination Capacitive deionization

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A deeper and hotter Martian core-mantle differentiation inferred from FeO partitioning

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Science Bulletin 2025年第3期70卷 429-436页

作者： Yunguo Li Chunhui Li You Zhou Yun Liu Huaiwei ni State Key Laboratory of Lithospheric and Environmental Coevolution University of Science and Technology of ChinaHefei 230026China Deep Space Exploration Laboratory/School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China Research Centre for Planetary Science College of Earth and Planetary SciencesChengdu University of TechnologyChengdu 610059China State Key Laboratory of Ore Deposit Geochemistry Chinese Academy of SciencesGuiyang 550081China

The core-mantle differentiation process plays a pivotal role in redistributing material on a massive scale,shaping the long-term evolution of rocky *** this process is crucial for gaining insights into the accretion and evolution of planets like ***,the details of Mars’s core-mantle differentiation remain poorly understood due to limited compositional data for its core and *** this study,we aim to constrain the Martian core-mantle differentiation by examining FeO partitioning between core and mantle materials,incorporating improved Martian compositional data from the InSight *** ab initio thermodynamic techniques,we calculated the FeO partition coefficient between liquid iron and silicate *** results align with previous studies while also clarifying the factors affecting partitioning *** on these findings and estimates of oxygen concentration in the core,we infer that Mars’s core and mantle likely differentiated at temperatures above 2440 K and pressures ranging from 14 to 22 *** these estimates are higher than previously reported,they are consistent with observed abundances of moderately siderophile elements and Mars’s accretion models.

关键词： Mars Core-mantle differentiation Volatile Partitioning

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