METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
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2022
·Vol. 53
·期 4
·2634-2646
·
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.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Cong Zheng,Cheng Zhang,Lifang He,Kui Zhang,Jian Zhang,Ling Jin,Abdullah M. Asiri,Khalid A. Alamry,Xiangfeng Chu
ZnFe 2 O 4 /ZnO nanosheets assembled microspheres (ZnFe 2 O 4 /ZnO SAS) were successfully constructed by hydrothermal synthesis of ZnO nanosheets assembled microsphere and subsequent growth of ZnFe 2 O 4 nanoparticles on it via a facile solution method. The morphologies and components of as-synthesized ZnFe 2 O 4 /ZnO SAS composites were varied with growth time, and ZnFe 2 O 4 /ZnO SAS composite with the growth time of 30 min (ZnFe 2 O 4 /ZnO SAS30) consisted of porous nanosheets assembled by small ZnFe 2 O 4 and ZnO nanoparticles. The composites were applied as sensing film for trimethylamine (TMA) sensing. ZnFe 2 O 4 /ZnO SAS30 based sensor exhibited good selectivity and higher response to TMA than that of sensors based on bare ZnO microspheres precursor, ZnO/ZnFe 2 O 4 nanoparticle composite and other ZnFe 2 O 4 /ZnO SAS composites, respectively. At 240 °C, the ZnFe 2 O 4 /ZnO SAS30 based sensor exhibited 31.5–100 ppm TMA with a quick response and recovery time of 3.1 s and 5.7 s, respectively, and even as low as 0.1 ppm TMA can be detected. Meanwhile, the corresponding cycling performance and stability was also checked. Such favorable comprehensive sensing performance of ZnFe 2 O 4 /ZnO SAS30 to TMA was attributed to its unique hierarchical structure and ZnO/ZnFe 2 O 4 heterojunctions . All results enabled potential applications of ZnFe 2 O 4 /ZnO SAS30 composite in TMA sensing.
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ENVIRONMENTAL TECHNOLOGY
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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.
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ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
·
2025
·
IF 2.9
Hu Wenquan,Chen Zhikang,Chen Qi,Zhu Xixi,Qin Yifan,Wang Ming
Heterogeneous photocatalysis has been widely recognized as one of the most effective methods for organic wastewater treatment. In this study, ZnFe 2 O 4 /ZnO nanocomposite were successfully synthesized via a one-step hydrothermal method and characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), UV–Visible diffuse reflectance spectroscopy (DRS), and Brunauer–Emmett–Teller specific surface area analyzer (BET). The photocatalytic activities of ZnFe 2 O 4 /ZnO nanocomposites were evaluated in the degradation of organic pollutants under ultraviolet irradiation. The results demonstrate that ZnFe 2 O 4 /ZnO nanocomposites exhibited superior photocatalytic activity in degrading methylene blue (MB), ofloxacin antibiotic (OFL), and sulfadiazine (SDZ), which the degradation rates for MB, OFL, and SDZ were 95.90%, 75.83%, and 72.32%, respectively, with corresponding degradation times of 70 min, 160 min, and 90 min. These values represented respective improvements of 30%, 47.03%, and 27.72% compared to ZnFe 2 O 4 nanomaterials, as well as enhancements of 2.05%, 19.53%, and 19.52% relative to ZnO nanomaterials. The formation of ZnFe 2 O 4 /ZnO heterostructure effectively suppressed electron–hole recombination, thereby significantly enhancing both the activity and stability of the photocatalysts. Furthermore, The findings from the photocatalytic cyclic degradation experiment demonstrate that the ZnFe 2 O 4 /ZnO nanocomposites exhibit excellent reusability as photocatalysts and hold significant potential for application in the treatment of industrial wastewater containing organic pollutants.
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CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Yujie Li,Haiming Zhang,Zhibiao Qiu,Ping Yang,Zongcheng Xu,Weiyan He,Bin Han
The detection of acetone holds significant importance for both non-invasive diabetes screening and industrial safety monitoring. In this work, novel ZnFe 2 O 4 /ZnO hollow core-shell nanospheres were synthesized via a two–step hydrothermal method for acetone detecting. The sensor performance was optimized by precise control the film thickness. Compared with pure ZnO and other samples, ZnFe 2 O 4 /ZnO with the optimal shell thickness exhibited superior acetone sensing performance, showing a response of 38.1 toward 100 ppm acetone at a lower operating temperature of 200 °C, which is more than three times higher than that of pure ZnFe 2 O 4 . The sensor also demonstrated excellent selectivity, rapid response and extremely low detection limit (0.08 ppm). The improved acetone sensing performance is attributed to the synergistic effect of heterojunction and the highly active Zn-terminated surfaces. Optimizing the ZnO shell thickness balances gas diffusion with maximized active surface exposure, thereby fully utilizing both mechanisms for superior sensitivity.
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JOURNAL OF AOAC INTERNATIONAL
·
2025
·
IF 1.7
Chen Hua,Zhang Hehua,Gu Xin,Pan hongzhi
BackgroundChlorogenic acid (CGA), a plant-derived phenolic compound, possesses antioxidant, anti-inflammatory, and antimicrobial activities. Accurate quantification is essential due to its therapeutic value and potential toxicity at high doses.ObjectiveTo develop a rapid, sensitive electrochemical method for CGA detection using spinel-based catalysts with improved conductivity.MethodsAn electrochemical sensing platform was constructed based on a nanocomposite of ZnFe2O4 and boron, sulfur and nitrogen co-doped reduced graphene oxide (BSN-rGO). This hybrid material effectively addresses the intrinsic poor conductivity of spinel oxides by leveraging the synergistic effect between the catalytic activity of ZnFe2O4 and the superior charge transport capability of BSN-rGO. The resulting sensor enabled rapid and quantitative analysis of CGA within two minutes.ResultsThe sensor showed a linear detection range of 1 × 10−4 −1 × 10−1 M and a low detection limit of 1 × 10−6 M (S/N = 3). Adding standard recovery reached 97.48% to 100.75%, with RSDs of 1.02% to 2.95%, indicating excellent accuracy and reproducibility in complex matrices.ConclusionThe proposed method enables rapid and reliable CGA detection in natural products, offering potential for pharmaceutical and food analysis.HighlightsBSN-rGO integration enhances spinel conductivity and boosts electrochemical sensing performance.
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Catalysts
·
2026
·Vol. 16
·期 3
·250
·
IF 4.5
Benqun Yang,Rui Yang,Lisha Dong,Haimei Xu,Shiming Qiu,Huimin Yang,Zhifeng Li,Guofang Zuo
Traditional oxidative dehydrogenation of n-butene has typically required relatively high operating temperatures (400–500 °C), which has driven increasing interest in the development of catalysts capable of delivering high activity at lower temperatures. In this study, zinc ferrite (ZnFe2O4-ST) was successfully synthesized via hydrothermal hydrolysis of Zn–Fe oleate and demonstrated remarkable catalytic performance for the oxidative dehydrogenation of n-butene under mild conditions. At 300 °C, ZnFe2O4-ST achieved a conversion of 72.9% with 92.1% selectivity toward 1,3-butadiene, a result that, to the best of our knowledge, ranks among the best reported in the literature. By contrast, ZnFe2O4prepared by conventional coprecipitation (17.2% conversion with 91.3% selectivity) and sol-gel (10.1% conversion with 86.4% selectivity) methods showed much lower activities, highlighting the critical influence of synthesis strategy on catalytic performance. To better understand the origin of these differences, a detailed structural and physicochemical characterization was undertaken using X-ray diffraction (XRD), thermogravimetric analysis (TGA), transmission electron microscopy (TEM), N2adsorption–desorption, X-ray photoelectron spectroscopy (XPS), H2-temperature-programmed reduction (H2-TPR), temperature-programmed re-oxidation (TPRO), and NH3-temperature-programmed desorption (NH3-TPD). These analyses revealed that the as-synthesized ZnFe2O4-ST possessed a significantly smaller average particle size, a larger specific surface area, and superior reducibility compared with the other samples. These properties are believed to be the key factors underpinning its outstanding catalytic behavior and provide important insights into the design of efficient low-temperature catalysts for selective oxidative dehydrogenation.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
Shuang Li,Yuchi Zhang,Le Han,Xianliang Li,Yan Xu
Hierarchical kiwifruit-like ZnO/ZnFe 2 O 4 heterostructures were prepared using Fe-doped Zn-based metal organic framework as a precursor combined with a subsequent thermolysis strategy. The hierarchical ZnO/ZnFe 2 O 4 composites featured well-organized nanosheet-like surface morphology assembled from interpenetrated ZnO and ZnFe 2 O 4 nanoparticles, facilitating the diffusion and surface reaction of specific gas molecules in gas sensing applications. As expected, a comparative study of triethylamine gas sensing performance between the kiwifruit-like ZnO/ZnFe 2 O 4 heterostructures and single-component ZnO proved that the former composites showed improved triethylamine gas sensitivity with R a /R g = 40.5 at an operating temperature of 200 °C. Specifically, the ZnO/ZnFe 2 O 4 heterostructure exhibited a fast response/recovery time of 32 s/41 s and excellent long-term stability of up to one month towards gaseous triethylamine. The enhanced trimethylamine gas sensing mechanism is ascribed to the intriguing kiwifruit-like hierarchical architecture of ZnO/ZnFe 2 O 4 heterojunction with ultrathin nanosheets on its surface and abundant accessible reactive sites interacting with the target gas molecules. This work offers new opportunities for rationally designing gas sensing materials by assembling the multi-component architectures.
研究领域:
材料科学
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化学工程
·
纳米技术
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INORGANIC CHEMISTRY
·
2018
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IF 4.7
Shumin Wu,Yan Xu,Xianliang Li,Ruifei Tong,Lu Chen,Yide Han,Junbiao Wu,Xia Zhang
Engineering semiconductors with porous hierarchical micro-/nanostructures is a feasible strategy to obtain high solar-light utilization efficiency and strong photocatalytic performance. In this work, an integrated strategy of solvent evaporation and morphology-inherited annealing for the Fe-based metal–organic framework was developed to prepare the hierarchical spinel zinc ferrite (ZnFe2O4) micro-/nanostructure. The morphology and porosity of the hierarchical ZnFe2O4 structures can be adjusted by optimizing the annealing temperatures. Benefitting from magnetic separation performance, these highly visible light-responsive hierarchical ZnFe2O4 micro-/nanostructures are demonstrated to be multifunctional photocatalytic materials, and their photocatalytic activity and reproducibility were analyzed, and the photocatalytic mechanism was also investigated. This work provides a controlled and generic route for constructing novel hierarchical semiconductors with specific compositions and intriguing structures.
研究领域:
材料科学
·
环境科学
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Zijian Liao,Mingliang Ma,Zhouyu Tong,Rongzhen Wang,Yuxin Bi,Yan Chen,Kwok L. Chung,Yong Ma
Nowadays, ferrites/carbon fibers have attracted considerable attention as microwave absorption materials (MA) due to the synergistic effect between dielectric and magnetic loss. Herein, the ZnFe 2 O 4 /C fibers were fabricated via electrospinning and calcination methods, and then polypyrrole (PPy) successfully coated on the fibers via oxidative polymerization. The ZnFe 2 O 4 /C@PPy composites exhibit enhanced EM wave absorption performance with the loading of 25 wt%. The optimal reflection loss (RL) value is up to −66.34 dB (13.80 GHz) and effective absorption bandwidth (EAB) is 5.74 GHz (11.78–17.52 GHz) with a matching thickness of 1.93 mm. Besides, high-efficient absorption performance of the ZnFe 2 O 4 /C@PPy composites is mainly attributed to the dielectric loss and ideal impedance matching. This study reveals a novel approach to development of ferrites/carbon fibers coated with PPy, and the ZnFe 2 O 4 /C@PPy composites exhibit great potential application as the materials with high-efficient absorption properties.
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Catalysis Science & Technology
·
2017
·Vol. 7
·期 18
·4092-4104
·
IF 5.773
Zhi Zhu,Yang Yu,Hai Huang,Xin Yao,Hongjun Dong,Zhi Liu,Yongsheng Yan,Chunxiang Li,Pengwei Huo
A unique Ppy@CdS/ZnFe2O4 nanoreactor is fabricated via the microwave-hydrothermal method and surface-imprinting technique, which effectively enhances the recyclability, stability, and selectivity for recognition and degradation of tetracycline under visible-light irradiation. The as-prepared functional nanoreactor enables photocatalytic reactions with little loss of activity during the recycling process. In addition, the capture experiments and ESR exploration show that h+ and ˙OH play the major roles in this photocatalytic reaction. Therefore, this study not only puts forward a novel design concept that develops the potential application value of CdS, but also provides a new approach for inhibiting its secondary pollution. Moreover, this nanoreactor has huge potential for the continuous and selective decomposition of specific pollutant molecules according to practical requirements.
研究领域:
环境科学
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材料科学
·
化学工程
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Tiantian Cao,Qiaolin Li,Gang Chen,Hongtao Guan,Chengjun Dong
Sensitive and selective acetone detection is critical for environmental monitoring and disease diagnostics, yet current sensors suffer from high operating temperatures and insufficient sensitivity. This study innovatively proposes an electrostatic self-assembly strategy to uniformly anchor small ZnFe 2 O 4 nanoparticles (around 20 nm) onto MOFs-derived one-dimensional (1D) hollow In 2 O 3 nanotubes, leading to the successful construction of an In 2 O 3 @ZnFe 2 O 4 core-shell heterostructure. The sensor based on In 2 O 3 @ZnFe 2 O 4 -7.5 exhibits a high response of 278 towards 200 ppm acetone at 200 °C, a low detection limit of 50 ppb with response of 1.85, good stability and moisture resistance. It is believed that the excellent sensing performance mainly originated in the formation of n-n heterojunction interfaces to enhance interfacial charge transfer and the effective suppression of ZnFe 2 O 4 aggregation. Thus, this work provides a facile strategy for the fabrication of heterojunction for gas sensors.
研究领域:
材料科学
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气体传感技术
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纳米材料
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环境监测
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疾病诊断
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