METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
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2022
·Vol. 53
·期 4
·2634-2646
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IF 2.872
Huang Jingdong,Sohn Il,Kang Youngjo,Yang Xiao
Earth’s commercial and affordable zinc reserves are expected to be depleted in less than 50 years. Since electric arc furnace (EAF) dust contains a certain amount of Zn, recovery of Zn from EAF dust has become an important issue to assure a sustainable resource supply in the future. The key technical challenge is that Zn mainly occurs in EAF dust as ZnFe 2 O 4 , a very stable crystal which is difficult to reduce or leach. MgCl 2 is believed to be effective in breaking the structure of ZnFe 2 O 4 . This work investigates the fundamentals of the reaction between MgCl 2 and ZnFe 2 O 4 . Experiments show that Zn in ZnFe 2 O 4 is chlorinated to ZnCl 2 quickly with priority over Fe, implying the efficacy of MgCl 2 in separating Zn and Fe in ZnFe 2 O 4 by selective chlorination. Effects of MgCl 2 /ZnFe 2 O 4 molar ratio and temperature on the reaction are clarified. Overuse of MgCl 2 slows down the reaction and is detrimental to the selective chlorination of Zn. Temperature can effectively increase the reaction rate as well as the priority of chlorinating Zn. Utilization of MgCl 2 could be high, because evaporation of MgCl 2 is not as fast as the reaction with ZnFe 2 O 4 . According to these results, a new technology to recover Zn from EAF dust by using MgCl 2 is proposed.
研究领域:
冶金工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Jiantao Feng,Yanhui Hou,Yechen Wang,Liangchao Li
Hierarchical structured ZnFe2O4@SiO2@RGO core–shell nanocomposites were prepared via a “coating–coating” route, and its structure, composition and electromagnetic properties were characterized. Compared with the binary composites of ZnFe2O4@SiO2, the hierarchical ZnFe2O4@SiO2@RGO ternary composites exhibited enhanced electromagnetic wave (EMW) absorption properties in terms of the effective bandwidth and minimum reflection loss (RL). Furthermore, EMW absorption properties of the prepared samples can be tuned by changing RGO content and thickness of SiO2 layer to reach the best impedance match. The minimum RL of the sample with a thickness of 2.8 mm can reach −43.9 dB at 13.9 GHz, and its effective bandwidth (RL ≤ −10 dB) was up to 6 GHz. Hence, the obtained products can be a new candidate for lightweight EMW absorbing materials.
研究领域:
材料科学
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电磁材料
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纳米技术
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复合材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 49
·39270-39277
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IF 3.84
Maiyong Zhu,Xin Zhang,Yong Zhou,Changhui Zhuo,Juncheng Huang,Songjun Li
A facile and cost-effective solvothermal approach to the fabrication of ZnFe2O4 microspheres composed of nanocrystals has been developed. The morphology and structure of the products were characterized by X-ray powder diffraction, transmission electron microscopy, and field-emission scanning electronic microscopy, and N2-adsorption–desorption. Meanwhile, the magnetic properties of the product were investigated via vibrating sample magnetism. Finally, the electrochemical performance of the obtained ZnFe2O4 microspheres was measured by cyclic voltammetry and galvanostatic charge–discharge techniques. The results show that such structured ZnFe2O4 has a specific capacitance of 131 F g−1 and stable cycling performance with 92% capacitance retention after 1000 cycles, which make it have a potential application as a supercapacitor electrode material.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2012
·
IF 2.421
Z.L. Zhang,M. Wan,Y.L. Mao
A TiO 2 -based composite, ZnFe 2 O 4 /TiO 2 , was prepared with a commercial TiO 2 (Degussa P25) and ZnFe 2 O 4 nanopowders using a simple method. The composite was characterized by X-ray diffraction (XRD), UV–vis absorption spectrum, surface photovoltage spectroscopy (SPS) and SEM. The composite presents an enhanced photovoltaic effect compared with the pure TiO 2 . The trap distributions of TiO 2 and ZnFe 2 O 4 /TiO 2 composite were investigated and the energy levels of TiO 2 and ZnFe 2 O 4 were analyzed. The results indicate that the enhancement of photovoltaic effect is mainly due to the increase of photo-generated carrier concentration and improvement of the separation efficiency of photo-generated carriers by the addition of ZnFe 2 O 4 .
研究领域:
材料科学
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光催化
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS TECHNOLOGY
·
2018
·
IF 1.232
Jie Yang,Hairong Chu,Mingxin Zhu,Haiqin Zhou,Yanhua Xu
In order to solve the disadvantages of most of the photocatalyst, ZnFe2O4 is chosen as the magnetic material and prepared ZnFe2O4/Ag3PO4 composite photocatalysts. ZnFe2O4 is prepared by hydrothermal method, the ZnFe2O4/Ag3PO4 is prepared by precipitation method, which supported Ag3PO4 on the surface of ZnFe2O4. The synthesis method of ZnFe2O4/Ag3PO4 not only simplifies the preparation process, but also improves the photocatalytic activity by suppressing the electron-hole recombination. These methods have important significance for the function alization and stability of photocatalytic materials. Moreover, the ZnFe2O4/Ag3PO4 is characterised by a series of testing means, such as SEM, XRD and EDS, etc. At the same time, this work realizes the effective control of environmental pollutants and lay the foundation for the research of organic pollution remove.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2025
·
IF 2.5
Yue Lei,Wang Bo,Huang Yiheng,Feng Changhao
In this study, gas sensors based on Er-doped ZnFe 2 O 4 nanofibers (E-ZFO NFs) with varying ratios of Er doping were prepared by a facile electrospinning approach. The sensor based on 3% E-ZFO NFs demonstrated an enhanced response value of 30.3 for 100 ppm n -butanol at 175°C, with response and recovery times of 9 s and 94 s, respectively. This is approximately 3.1 times that of undoped ZFO NFs. Moreover, the sensor exhibited a minimum detection limit of 0.1 ppm, with excellent repeatability and selectivity. These results indicate that the sensors utilizing E-ZFO NFs are promising candidates for n -butanol gas sensors.
研究领域:
材料科学
·
传感技术
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2019
·
IF 6.864
Fangxu Dai,Ruiyang Zhao,Xudong Huai,Jishu Han,Lei Wang,Shouhua Feng
Magnetic ZnFe 2 O 4 @ZnSe hollow nanospheres were fabricated by a two-step method and applied for visible light photocatalytic water splitting . Magnetic ZnFe 2 O 4 hollow nanosphere was prepared by using the carbonaceous microsphere as a template, and ZnSe nanoparticles were in site grown on the ZnFe 2 O 4 surface. Through optimizing the reaction time, ZnFe 2 O 4 @ZnSe hollow nanospheres exhibited efficient light absorption and improved photocatalytic performance, and ZnFe 2 O 4 @ZnSe-20 with suitable ZnSe shell thickness possessed highest hydrogen production amount in 6 h (16897.3 μmol/g). The experimental results revealed that the formation of heterojunction between ZnSe and ZnFe 2 O 4 effectively separated and transferred the photo-induced electrons and holes, and inhibited the electron-hole pairs recombination. In addition, the magnetic recyclability of ZnFe 2 O 4 @ZnSe hollow nanospheres was beneficial to further photocatalytic hydrogen production application.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
Science of Advanced Materials
·
2015
·Vol. 7
·期 2
·295-300
·
IF 2.598
Liang Peng,Zhang Lin,Zhao Xiaoliang,Li Jianjiang,Liu Long,Cai Rongsheng,Yang Dongjiang,Umar Ahmad
It is an efficient strategy to extend the light response range of TiO2-based photocatalysts to visible light region by constructing heterojunctions with the low bandgap semiconductors. The bandgap edge match between the low bandgap semiconductors and the TiO2 substrate
is believed to a key to sensitize the TiO2-based photocatalysts. In this study, TiO2 (anatase) nanofibers were modified by ZnFe2O4 nanoparticles from ZnO colloid. The ZnFe2O4 nanoparticles with a relatively narrow band gap of
1.90 eV and the conduction band edge at –1.54 eV (vs NHE) which is more negative than that of TiO2. So as expected, the ZnFe2O4 particles extended the photoresponse of TiO2 (anatase) nanofibers into the visible light region and enhanced the
photoresponse of UV light. The photogenerated electron–hole separation in ZnFe2O4/TiO2 (anatase) composite nanofibers is responsible for the rapidly increased photocurrent under the visible light and UV light irradiation.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
CARBON
·
2020
·
IF 8.821
Xiaochuang Di,Yan Wang,Yuqiao Fu,Xinming Wu,Ping Wang
Thin and lightweight absorbers with strong absorption capacity are future development directions in the field of electromagnetic wave (EMW) absorption. Based on two microwave-absorbing mechanisms, the three-dimensional (3D) porous carbon materials derived from wheat flour were prepared via pyrolysis carbonization . Then, ZnFe 2 O 4 nanospheres were synthesized and distributed on the surface of carbon skeleton by simple solvothermal method. Results showed that microwave absorption performance was significantly improved due to synergistic effects between ZnFe 2 O 4 nanospheres and carbon matrix. With absorber thickness of only 1.8 mm and low filler loading of 20 wt%, the minimum reflection loss could reach as low as −54.1 dB at 14.1 GHz. The widest effective absorption bandwidth ranged from 9.2 GHz to 15.0 GHz (5.8 GHz) with a thickness of 2.5 mm when the filler loading was 10 wt%, covering 36% of entire measured bandwidth. As an absorber, 3D porous carbon@ZnFe 2 O 4 composite exhibited ideal microwave absorption properties because of synergistic effects between dielectric and magnetic loss, well-matched impedance, interfacial polarization , Debye relaxation process as well as multiple reflection and scattering. Considering excellent EMW absorption performance, the porous carbon@ZnFe 2 O 4 composite fabricated by a simple method can provide a new inspiration for designing structure and composition of lightweight microwave absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2023
·
IF 3.6
Danqiang Huang,Jianfeng Dai,Zengpeng Li,Xinchao Wen,Wei Feng,Hui Liu
Hollow ZnFe 2 O 4 /carbon-based nanocomposite absorbers were successfully synthesized using a simple one-pot solvothermal process. Different methods were used to study the physical structure, microstructure, functional groups, and magnetic properties of the composite absorbers. The addition of different carbon-based nanomaterials improves the wave absorption properties in different ways. It not only improves the absorption strength, but also increases the effective absorption bandwidth. According to research findings, a maximum reflection loss of − 37.47 dB was obtained for pure hollow ZnFe 2 O 4 at 1.6 mm, −49.17 dB for ZnFe 2 O 4 /rGO at 3.6 mm, −40.31 dB for ZnFe 2 O 4 /MWCNTs at 4.8 mm, and − 27.64 dB for ZnFe 2 O 4 /MWCNTs/rGO at 1.9 mm. The excellent electromagnetic wave absorption is attributed not only to the magnetic loss of the ferrite and the dielectric loss of the carbon-based nanomaterials, but also to the interfacial polarization between the different materials and the dipolar polarization of the residual functional groups.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Wenjie Zhao,Meng Zhou,Lizhang Lv,Heqing Fu
Self-healing hydrogel has become a hot spot for various practical applications such as biomedical materials and electron devices. However, developing composite hydrogels with self-healing, conductive, magnetic and other properties still remains a serious challenge. In this paper, we developed self-healing, conductive and magnetic ZnFe 2 O 4 /MCNT/PPy ternary composite hydrogels based on PVA . The composite hydrogels possessed several features including a high stretchability (about 800%), good electrical conductivity (0.3465 S m −1 ) and nice magnetism (4.10 emu g −1 ). Furthermore, the composite hydrogels exhibited excellent self-healing property owed to the dynamic interactions (boric acid ester bonds and hydrogen bonds). Due to the conductivity, magnetism, self-healing and other properties, the novel composite hydrogels were expected to be a promising material in many advanced applications, such as electronic skins, drug delivery carriers and electromagnetic interference shielding . In addition, we have reason to believe that the biocompatibility and easy-remolding property of the composite hydrogels would make them a great candidate for 3D printing technique of human organs.
研究领域:
材料科学
·
生物医学工程
·
电子器件
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2020
·
IF 2.213
Huiqiang Wang,Minghua Liu,Xin Luo,Yifan Liu,Shuna Hou,Yuancai Lv
ZnFe2O4/AC composites were prepared by a one-pot hydro-thermal method using the activated carbon as a carrier. The structural, textural and surface properties of the adsorbent have been comprehensively characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectra, physical adsorption instrument (BET) and TG-DSC analysis. The removal capacities of the composites were investigated via testing the adsorption capacity at the self-made desulfurization equipment. The process of adsorption for SO2 was analysed by kinetic model and thermodynamic model. The results show that the adsorption capacity of ZnFe2O4/AC composites adsorption kinetics process was conformity with the first kinetics mode1. The adsorption process was in accordance to the Langmuir and Freundlich equation. Additionally, the whole process belonged to spontaneous and exothermic reaction.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）