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Frontiers of Chemical Science and Engineering 2023年第12期17卷 2088-2100页

作者： Xicheng Gao Jianqiang Bi Linjie Meng Lulin Xie Chen Liu Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China

NiFe_(2)O_(4) is a kind of bimetallic oxide possessing excellent theoretical capacity and application prospect in the field of ***,due to the inherent poor conductivity of metal oxides,the performance of NiFe_(2)O_(4) is not ideal in *** vacancies can not only enhance the conductivities of NiFe_(2)O_(4) but also provide better adsorption of OH,which is beneficial to the electrochemical ***,oxygen vacancies engineered NiFe_(2)O_(4)(NiFe_(2)O_(4)‒δ)is obtained through a two-step method,including a hydrothermal reaction and a further heat treatment in activated carbon *** of electron paramagnetic resonance spectra indicate that more oxygen vacancies exist in the treated NiFe_(2)O_(4)‒δthan the original ***-Vis diffuse reflectance spectra prove that the treated NiFe_(2)O_(4)‒δowns better conductivity than the original NiFe_(2)O_(4).As for the electrochemical performances,the treated NiFe_(2)O_(4)‒δperforms a high specific capacitance of 808.02 F∙g^(‒1) at 1 A∙g^(‒1).Moreover,the asymmetric supercapacitor of NiFe_(2)O_(4)‒δ//active carbon displays a high energy density of 17.7 Wh∙kg^(‒1) at the power density of 375 W∙kg^(‒1).This work gives an effective way to improve the conductivity of metal oxides,which is beneficial to the application of metal oxides in supercapacitors.

关键词： nickel ferrite oxygen vacancy high conductivity supercapacitor

Synthesis of nickel ferrite precursors from low grade nickel matte

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Transactions of Nonferrous Metals Society of China 2013年第8期23卷 2422-2430页

作者：何利华赵中伟张有新中南大学冶金与环境学院长沙410083 金川集团股份有限公司金昌737104

Fine nickel ferrite precursors NiFe2（C204）3·6H2O were obtained via co-precipitation method with low grade nickel matte as the raw material. Thermodynamic analysis of NiClz-FeC12-（NH4）2C204-H20 system for precipitation identified that the theoretical optimum co-precipitation pH value is 2, and C2O2 has strong complexation with Ni2＋ and Fe2＋ ions. Based on these theoretical considerations, the effects of parameters on the precipitation rates and precursors size were investigated systematically. The results show that the optimum co-precipitation conditions are pH=2, temperature 45 ℃, 1.2 times theoretical amount of （NH4）2C204 dosage and 3% PEG400 addition. Under these conditions, the precipitation rates of Ni2＋ and Fe2＋ are both over 99.8%, with the precursors size of 1-2 urn. Furthermore, X-ray diffraction （XRD） and thermogravimetry-differential thermal analysis （TG-DTA） demonstrate that the precursors are single-phase solid solution, wherein the nickel/iron atoms are replaced by the iron/nickel atoms reciprocally.

关键词： nickel ferrite ferrite magnetic materials co-precipitation low grade nickel matte

Preparation and Photocatalytic Properties of Magnetically Separable TiO_2 Supported on nickel ferrite

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Chinese Journal of Chemical Engineering 2007年第2期15卷 190-195页

作者：许士洪上官文峰袁坚陈铭夏施建伟 Research Center for Combustion and Environment Technology School of Mechanical and Power EngineeringShanghai Jiao Tong University

A magnetically separable photocatalyst TiO2/SiO2/NiFe2O4 （TSN） with a typical ferromagnetic hysteresis was prepared by a liquid catalytic phase transfer method. When the intensity of applied magnetic field weakened to zero, the remnant magnetism of the prepared photocatalyst faded to zero. The photocatalytst can be separated from water when an external magnetic field is added and redispersed into aqueous solution after the external magnetic field is eliminated, that makes the photocatalysts promising for wastewater treatment. Transmission electron microscope （TEM） and X-ray diffractometer （XRD） were used to characterize the structure of the photocatalyst indicating that the magnetic SiOffNiFe204 （SN） particle was compactly enveloped by P-25 titania and Tit2 shell was formed. The magnetic composite showed high photocatalytic activity for the degradation of methyl orange in water. A thin SiO2 layer between NiFe2O4 and TiO2 shell prevented effectively the leakage of charges from TiO2 particles to NiFe2O4, which gave rise to the increase in photocatalytic activity. Moreover, the experiment on recycled use of TSN demonstrated a good repeatability of the photocatalytic activity.

关键词： photocatalyst magnetically separable TiO2 nickel ferrite

Influences of La^(3+) Substitution on Structure and Electromagnetic Properties of Nanocrystalline nickel ferrites

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Journal of Rare Earths 2007年第S1期25卷 17-20页

作者：马瑞廷田彦文周莉毕韶丹李喜坤 Materials Science and Engineering school Shenyang Ligong University School of Materials and Metallurgy Northeastern University School of Materials & Chemistry Liaoning University of Petroleum and Chemical Technology

Nanocrystalline nickel ferrites with substitution of Fe3+ by rare-earth La3+, according to the formula NiLaxFe2-xO4 (with x=0, 0.05, 0.1 and 0.15), were prepared by polyacrylamide gel method. Influences of the amount of La3+ substitution on the structure and electromagnetic properties of NiLaxFe2-xO4 compounds were systematically investigated by DSC-TG, XRD, TEM and wave-guide method. XRD results indicated that the pure spinel-type crystal structure of the NiLaxFe2-xO4 (x=0 and 0.05) was obtained at 500 ℃. TEM results showed that the average particle sizes of NiFe2O4 and NiLa0.1Fe1.9O4 particles were about 10 and 15 nm, respectively. The complex permittivity and complex permeability was measured in the frequency range of 8.2～12.4 GHz. The results revealed that the nanocrystalline NiLaxFe2-xO4 had both dielectric loss and magnetic loss in the frequency range of 8.2～12.4 GHz. The tgδε and tgδm of NiLaxFe2-xO4 (with x=0 and 0.05) decreased with the increase of La3+ ions content, and some strong resonance peaks of the tgδε and tgδm of NiLaxFe2-xO4 (with x=0.1 and 0.15) appeared because of the secondary phases (LaFeO3) and more lattice defects.

关键词： polyacrylamide gel nanocrystalline lanthanum substitution nickel ferrite electromagnetic properties rare earths

Catalytic ozonation treatment of papermaking wastewater by Ag-doped NiFe2O4 : Performance and mechanism

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Journal of Environmental Sciences 2020年第11期32卷 75-84页

作者： Junyu Zhao Jiashun Cao Yujie Zhao Teng Zhang Di Zheng Chao Li Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of EducationHohai UniversityNanjing 210098China College of Environment Hohai UniversityNanjing 210098China China United Engineering Corporation Limited Zhejiang 310000China

The catalytic ozonation treatment of secondary biochemical effluent for papermaking wastewater by Ag-doped nickel ferrite was ***-doped catalysts prepared by sol-gel method were characterized,illustrating that Ag entirely entered the crystalline of Ni Fe2O4 and changed the surface *** addition of catalyst enhanced the removal efficiency of chemical oxygen demand and total organic *** results of gas chromatography-mass spectrometer,ultraviolet light absorbance at 254 nm and threedimensional fluorescence excitation-emission matrix suggested that aromatic compounds were efficiently degraded and toxic substances,such as dibutyl *** addition,the radical scavenging experiments confirmed the hydroxyl radicals acted as the main reactive oxygen species and the surface properties of catalysts played an important role in the ***,this work validated potential applications of Ag-doped Ni Fe2O4 catalyzed ozonation process of biologically recalcitrant wastewater.

关键词： Papermaking wastewater Secondary effluent nickel ferrite Ag-doping Catalytic ozonation

The performance of activated carbon/NiFe_(2)O_(4) magnetic composite to retain heavy metal ions from aqueous solution

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Chinese Journal of Chemical Engineering 2021年第1期34卷 135-145页

作者： S.I.Moussa M.M.S.Ali Reda R.Sheha Nuclear Chem.Dept. Hot Lab CenterAtomic Energy AuthorityCairo 13759Egypt Analytical Chem.Dept. Hot Lab CenterAtomic Energy AuthorityCairo 13759Egypt

A novel magnetic activated carbon composite(AC/NiF) was synthesized by a precipitation method and applied in retention of Cu(Ⅱ),and Zn(Ⅱ) ions from aqueous *** impact of different sorption parameters such as:equilibration time,solution pH value,competing cations and ionic strength on the amount sorbed of Cu(Ⅱ),and Zn(Ⅱ) was *** illustrated that the magnetic composite had retention ability towards both metal ions significantly higher than that of activated carbon(AC).The magnetic composite exhibited an affinity to adsorb Cu(Ⅱ) higher than Zn(Ⅱ) *** maximum sorption capacities(Q_(max)) of the applied magnetic composite(AC/NiF)towards Cu(Ⅱ) and Zn(Ⅱ) were 105.8 and 75.1 mg·g^(-1),*** of Cu(Ⅱ) and Zn(Ⅱ) was proposed to be achieved though an ion exchange and surface adsorption in neutral conditions,while precipitation was believed to be the relevant mechanism in their removal from basic *** kinetic studies showed that sorption process followed the kinetics of pseudo-second-order reactions with rate constant of 3 × 10^(-3) and 2 × 10^(-3) min^(-1)for sorption of Cu(Ⅱ) and Zn(Ⅱ) onto AC/NiF *** of Cu(Ⅱ) slightly decreased with increasing the ionic strength of aqueous solution,using NaCl as a background *** contrast,presence of Mn(Ⅱ),Mg(Ⅱ)and Co(Ⅱ) in reaction solutions highly depressed the sorption of Cu(Ⅱ) and Zn(Ⅱ) with a competing efficiency followed the order:Mg(Ⅱ)> Mn(Ⅱ)> Co(Ⅱ).The magnetic composite was rapidly recovered from aqueous solution by an external magnetic field,and effectively regenerated using 0.1 mol L^(-1) HCl and 0.1 mol L^(-1) FeCl_(3) as *** of Cu(Ⅱ) and Zn(Ⅱ) onto the surface of AC/NiF composite occurred via a spontaneous *** thermodynamically favorable process had ΔH~o values of 30.9 kJ·mol^(-1) and 19.7 kJ·mol^(-1),*** results confirm that the magnetic composite can be viewed as a promising novel composite opens new opportunities f

关键词： Activated carbon nickel ferrite Composite Mechanism

Enhanced solar-light-driven photocatalytic properties of novel Z-scheme binary BiPO_(4)nanorods anchored onto NiFe_(2)O_(4)nanoplates:Efficient removal of toxic organic pollutants

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Journal of Environmental Sciences 2021年第4期33卷 326-340页

作者： Ravindranadh Koutavarapu Mohan Rao Tamtam Chimpiri Rao Myla Migyung Cho Jaesool Shim School of Mechanical Engineering Yeungnam UniversityGyeongsan 712-749Republic of Korea Chemical Engineering Department Debre Berhan UniversityDebre Berhan 445Ethiopia Department of Physics Andhra Loyola CollegeVijayawada 520-008Andhra PradeshIndia Department of Computer and Media Engineering Tongmyong UniversityBusan 48520Republic of Korea

Global environmental problems have been increasing with the growth of the world economy and have become a crucial *** replace fossil fuels,sustainable and eco-friendly catalysts are required for the removal of organic *** this study,nickel ferrite(NiFe_(2)O_(4))was prepared using a simple wet-chemical synthesis,followed by calcination;bismuth phosphate(BiPO_(4))was also prepared using a hydrothermal ***,NiFe_(2)O_(4)/BiPO_(4)nanocomposites were prepared using a hydrothermal *** characterization studies,such as structural,morphology,surface area,optical,photoluminescence,and photoelectrochemical investigations,were used to analyze NiFe_(2)O_(4)/BiPO_(4)*** morphology analysis indicated a successful decoration of BiPO_(4)nanorods on the surface of Ni Fe_(2)O_(4)***,the bandgap of the NiFe_(2)O_(4)/BiPO_(4)nanocomposites was modified owing to the formation of a *** as-prepared NiFe_(2)O_(4)/BiPO_(4)nanocomposite exhibited promising properties to be used as a novel heterostructure for tetracycline(TC)and Rhodamine B(Rh B)*** NiFe_(2)O_(4)/BiPO_(4)nanocomposite degrades TC(98%)and Rh B(99%)pollutants upon solar-light irradiation within 100 and 60 min,***,the trapping experiments confirmed the Z-scheme approach of the prepared *** efficient separation and transfer of photogenerated electron-hole pairs rendered by the heterostructure were confirmed by utilizing electrochemical impedance spectroscopy,photocurrent experiments,and ***–Schottky measurements were used determine the positions of the conduction and valence bands of the samples,and the detailed mechanism of photocatalytic degradation of toxic pollutants was projected and discussed.

关键词： nickel ferrite Bismuth phosphate Heterostructure Z-scheme Tetracycline Photocatalysis

Multiferroic behaviour of epitaxial NiFe_2O_4-BaTiO_3 heterostructures

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Chinese Physics B 2008年第10期17卷 3910-3916页

作者：张毅邓朝勇马静林元华南策文 Department of Materials Science and Engineering State Key Laboratory of New Ceramics and Fine Processing Tsinghua University

Multiferroic NiFe2O4 （NFO）-BaTiO3 （BTO） bilayered thin films are epitaxially grown on （001） Nb-doped SrTiO3 （STO） substrates by pulsed-laser deposition （PLD）. Different growth sequences of NFO and BTO on the substrate yield two kinds of epitaxial heterostructures with （001）-orientation, i.e. （001）-NFO/（001）-BTO/substrate and （001）- BTO/（001）-NFO/substrate. Microstructure studies from x-ray diffraction （XRD） and electron microscopies show differences between these two heterostructures, which result in different multiferroic behaviours. The heterostructured composite films exhibit good coexistence of both ferroelectric and ferromagnetic properties, in particular, obvious magnetoelectric （ME） effect on coupling response.

关键词： magnetoelectric effect epitaxial heterostructure nickel ferrite multiferroics

Fabrication and magnetic properties of NiFe_2O_4 nanorods

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Rare Metals 2010年第4期29卷 385-389页

作者： WU Yue SHI Changhong YANG Wei National Key Laboratory for Electronic Measurement Technology North University of China Taiyuan 030051 China School of Mechanical andElectronic Engineering North University of China Taiyuan 030051 China The Quartermaster Institute of the General Logistics Department of the PLA Beijing 100010 China

NiFe2O4 nanorods have been successfully synthesized via thermal treatment of the rod-like precursor fabricated by Ni-doped （x-FeOOH, which was enwrapped by the complex of citric acid and Niz~. The morphology evolution during the calcination of the precursor nanorods was investigated with transmission electron microscopy （TEM）, and the phase and the magnetic properties of samples were analyzed through X-ray diffraction （XRD） and vibrating sample magnetometer （VSM）. The results indicated that the diameter of the NiFe204 nanorods obtained ranged between 30 and 50 nm, and the length ranged between 2 and 3 um. As the calcination temperature was up to 600℃, the coercivity, saturation magnetization, and remanent magnetization of the samples were 36.1 kA.m^-1, 27.2 ***^-1, and 5.3 ***^-1, respectively. The NiFe2O4 nanorods prepared have higher shape anisotropy and superior magnetic properties than those with irregular shapes.

关键词： inorganic compounds nickel ferrite nanorods electron microscopy magnetic properties

Synthesis and Characterization of NiFe_2O_4 Magnetic Nanoparticles by Combustion Method

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Journal of Materials Science & Technology 2013年第1期29卷 34-38页

作者： M.Kooti A.Naghdi Sedeh Chemistry Department College of Science Shahid Chamran University

Magnetic nanoparticles of nickel ferrite （NiFe204） have been successfully synthesized by microwave-assisted combustion method using stable ferric and nickel salts as precursors and glycine as fuel. The as-synthesized samples were characterized by Fourier transform infrared spectroscopy （FT-IR）, X-ray diffraction （XRD）, transmission electron microscopy （TEM）, vibrating sample magnetometer （VSM） and field emission scanning electron microscopy （FESEM）. The effect of different dose of glycine on the structural parameters and magnetic properties of the prepared NiFe204 nanoparticles was also investigated. This study revealed that it was possible to produce larger size of nanoparticles with lower saturation magnetization by using higher dose of fuel.

关键词： Nanoparticles Combustion Microwave nickel ferrite Glycine