ChemCatChem
·
2024
·
IF 3.8
Qichao Lu,Changxiao Li,Jie Li,Qiong Tang,Lei Liu,Jinxiang Dong
Graphical ZnFe 2 O 4 spinel with various morphologies for FTS : Compared to octahedral ZnFe 2 O 4 spinel, the cubic ZnFe 2 O 4 spinel was more prone to the formation of Fe 5 C 2 phase under syngas atmosphere and exhibited higher catalytic activity and light olefins selectivity. The shape-defined ZnFe 2 O 4 spinel with cubic and octahedral morphology was hydrothermally synthesized, respectively, and used as catalyst precursor for Fischer–Tropsch synthesis (FTS). The structure of ZnFe 2 O 4 spinel was changed to ZnO and Fe 5 C 2 (Fe 5 C 2 /ZnO) after reduction and carbonization. Interestingly, ZnFe 2 O 4 with cubic morphology exhibited much higher catalytic activity and selectivity toward low-carbon olefins (C 2 –C 4 ) than the octahedral one under identical conditions, and the latter tended to produce the saturated alkanes. The primary properties of ZnFe 2 O 4 materials before and after reduction were systematically studied through a series of characteristic technologies to reveal the difference in catalytic performance between the two ZnFe 2 O 4 spinels with different morphologies.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yujie Li,Haiming Zhang
It is still a huge challenge for a chemical sensor to realize low concentration acetone detection at room temperature (RT). In this work, we present an ultrafast RT acetone sensor based on the BiFeO 3 /ZnFe 2 O 4 hollow core-shell nanospheres for the first time. The BiFeO 3 /ZnFe 2 O 4 sensor exhibited the excellent response of 41.42 towards 100 ppm acetone at RT, while ZnFe 2 O 4 has almost no response in the same conditions. Further, the detection limit of BiFeO 3 /ZnFe 2 O 4 is low to 272 ppb at RT, which is below the range of applications for noninvasive diagnosis of diabetes. It worth noting that it showed ultrafast response/recovery ability (7/5 s) and good acetone selectivity at RT. Additionally, the performance of BiFeO 3 /ZnFe 2 O 4 increased by 179 % under 405 nm UV irradiation compared to that without UV light. The synergistic effects of hollow spherical structures, p-n heterojunctions and excellent photovoltaic characteristics of BiFeO 3 lead to the improved performance of BiFeO 3 /ZnFe 2 O 4 sensor. This work holds great potential for the development of RT acetone sensors in low concentrations detection.
研究领域:
材料科学
·
传感器技术
·
医学检测
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2017
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IF 2.084
Ruixia Shi,Yan Zhang,Xingtao Wang,Qian Ma,Aiyu Zhang,Ping Yang
Porous ZnFe 2 O 4 nanotubes and nanobelts have been fabricated through an efficient and facile approach of electrospinning followed by two-step calcination in atmosphere. The influences of electrospinning parameters such as metallic salt content, PVP content, the ratio of ethanol to water, stirring time and applied voltage on the composite fibers have been fully investigated. When the calcination temperature was increased from 600 °C to 650 °C, the ZnFe 2 O 4 nanotubes evolved into well-crystalline nanobelts due to the faster gas diffusion , more active grain growth and atomic diffusion rate caused by the relative high temperature. The plausible formation mechanism of ZnFe 2 O 4 nanotubes and nanobelts was proposed and discussed in detail. The photocatalytic activities for the photo-degradation of Rhodamine B (RhB) over ZnFe 2 O 4 nanotubes and nanobelts were evaluated under the UV-light irradiation. The degradation efficiency of nanotubes and nanobelts both can reach 99.7% after 20 min UV irradiation in presence of H 2 O 2 because of synergistic effects of Fe 3+ and H 2 O 2 , respectively, indicating the excellent Fenton-like photocatalytic properties of ZnFe 2 O 4 nanotubes and nanobelts. Additionally, the Fenton-like photocatalytic mechanism was also discussed.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2021
·
IF 6.498
Jiayi Li,Ying Huang,Minhua Su,Yuying Xie,Diyun Chen
Heterocyclic aromatic compounds such as malachite green can cause immense harm to the environment and mankind because of their toxic bio-accumulation and insufficient biodegradation. ZnFe 2 O 4 /TiO 2 (ZF-T) has attracted attentions as a visible-light-driven catalyst because it can break and mineralize benzene through photolysis. Compared with TiO 2 , which photodegrades only 53.5% malachite green, anatase TiO 2 loaded with ZnFe 2 O 4 has greater photocatalytic activity and can degrade up to 90.1% malachite green. Furthermore, a photocatalytic efficiency above 80% can be obtained through five consecutive cycles with a duration of 4 h. In this study, ZF-T was characterized, and its photolytic parameters, including dosage, pH, time, and ionic strength, were optimized. The photolytic products of malachite green were analyzed by ultraviolet–visible spectroscopy and liquid chromatography-mass spectrometry, which confirmed that ZF-T can drive visible light to produce •O 2 − and H + free radicals that can efficiently degrade heterocyclic aromatic hydrocarbons and cleave benzene rings. These outcomes deepen our understanding of the development and applications of visible-light-driven ZF-T composites in the field of wastewater purification.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Hang Zhao,Huifang Gao,Senlin Jin,Yaxuan Yao,Xu Li,Jingji Zhang,Quan Zong,Lingling Ren
Exploring interfacial engineering in metal oxide/reduced graphene oxide composite becomes a hotspot in the field of electromagnetic wave (EMW) absorption. In this work, three-dimensional (3D) porous ZnFe 2 O 4 /reduced graphene oxide (ZFO/rGO) composite aerogel was synthesized in situ by a hydrothermal reduction method combined with freeze-drying technique. The results reveal that dispersed ZFO nanoparticles (NPs) are bonded to defect-rich 3D conductive rGO skeleton in a bridging mode with Fe-O-C, resulting in enhanced conduction loss. Consequently, the defect-rich ZFO/rGO composite aerogel exhibits an outstanding EMW absorbing properties: a minimum reflection loss ( RL min ) value of − 29.12 dB and an effective absorption bandwidth (EAB with RL less than −10 dB) of 3.57 GHz at an ultra-thin matching thickness of 1.51 mm. This work provides a new strategy for constructing defect-rich graphene-based composite aerogel as an efficient EMW absorbing materials.
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 Today Communications
·
2023
·
IF 3.8
Fenting Yu,Beiyang Guo,Yuan Zhuang,Sridhar Komarneni,Jianfeng Ma
The ZnFe 2 O 4 -Bi 2 MoO 6 composite photocatalyst was applied to construct a persulfate activation system combined with photocatalysis . The composite material was synthesized by a simple hydrothermal method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and UV–vis diffuse reflectance spectroscopy (UV-Vis DRS) to study the phase formation, morphology, valence state of elements and light absorption property, respectively. The experimental results showed that the degradation efficiency of tetracycline can reach 84 % in 40 min under visible light, with K 2 S 2 O 8 as the co-catalyst. The principal advantage of this system is that it can be applied to a wide pH range (3−11) with negligible influence. This system is also less affected by anions (HCO 3 2- , NO 3 - , Cl - ,) and humic acid (HA). The excellent catalytic performance may be due to the retention of electron hole pairs with high redox ability after the construction of heterojunction and the formation of active radicals, O 2 •- , SO 4 •- and •OH. In addition, the ZnFe 2 O 4 /Bi 2 MoO 6 composite catalyst showed good stability and recyclability.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Chengjun Dong,Ruonan Tian,Yanlin Zhang,Kaili Liu,Gang Chen,Hongtao Guan,Zongyou Yin
Rational integration of multifunctions is an emerging strategy to develop novel chemiresistor nano platforms with superior sensing properties. Herein, a stepwise synthesis strategy is developed to assemble two MOFs with huge mismatch into MOF-on-MOF heterojunction , which was nanoarchitectured into Fe 2 O 3 @ZnFe 2 O 4 radial-heterospindles. The Fe 2 O 3 @ZnFe 2 O 4 heterospindles exhibited outstanding selective acetone detection with multifaceted superiorities, such as high response, low limit of detection, fast response and recovery time, and good linearity in responses with a wide concentration window. An in-depth discussion revealed that such multifaceted sensing characters can be attributed to the distinct radial-heterostructure which proffer synergetic effects in the unimpeded gas diffusion with mesoporous sensing nanoarchitecture, favored interfacial charge transport in radial heterojunction, abundant active adsorption/reaction sites by rich oxygen vacancies, and exponential/efficient tuning of sensor resistance with barrier height. This synthetic strategy here may offer a new opportunity for fabricating dual-to-multi MOFs-based advanced nanostructures towards practical chemiresistor nanoplatforms with favorable multifaceted superiorities.
研究领域:
材料科学
·
化学传感器
✓ 已验证
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2018
·
IF 2.891
Yang Cao,Xianyu Lei,Qianlin Chen,Chao Kang,Wenxue Li,Baojun Liu
As a broad-spectrum antibacterial agent, tetracycline hydrochloride (TCHC) was widely used in medical treatment and animal husbandry. However, the TCHC in various systems such as the soil, rivers and foods, had caused great harm to the environment and human health. Among the many methods for treated tetracycline hydrochloride in wastewater, the photocatalytic treatment had great advantages. In this study, we used Prussian blue as a precursor to synthesized porous hollow spinel cube ZnFe 2 O 4 for photocatalysis. The experimental results showed that the degradation rates of the prepared porous hollow cube ZnFe 2 O 4 (l-ZnFe 2 O 4 ) significantly better than the commercially available ZnFe 2 O 4 (g-ZnFe 2 O 4 ) and the ZnFe 2 O 4 prepared by the coprecipitation method (p-ZnFe 2 O 4 ). In addition, we made a further introduction on the degradation mechanism of TCHC. The porous hollow cube ZnFe 2 O 4 could be expected to provide a green and effective for material degradation of tetracycline hydrochloride in water.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Dinh-Trinh Tran,Thi-Phuong-Thao Vu,Santi Kongmany
In this study, ZnFe 2 O 4 , BiVO 4 , and ZnFe 2 O 4 /BiVO 4 /rGO materials were synthesized using the hydrothermal method in mild conditions to study the oxytetracycline (OTC) degradation process. The results on surface morphology, functional group, structure, and optical and electrochemical characteristics revealed that ZnFe 2 O 4 /BiVO 4 /rGO were successfully prepared with high purity and good distribution of chemical elements. The impact of different parameters like pH, catalyst load, reaction time, initial OTC concentration, and the presence of ozone-nanobubbles on the OTC degradation efficiency was systematically examined to obtain optimal treatment conditions. Synergic effects between ozone-nanobubbles and ZnFe 2 O 4 /BiVO 4 /rGO heterojunction led to an enhancement of over 20 % of OTC degradation yield. The OTC degradation reached 96.3 % within 100 min at optimal conditions (pH 7.0, [Cat.] = 0.5 g/L, and [OTC] = 20 mg/L). The combination of ZnFe 2 O 4 and BiVO 4 allowed to benefit from the generation of both effective electrons and holes, which enhanced the generation rate of both superoxide and hydroxyl radicals responsible for degrading the pollutant in water while rGO sheets contributed to slowing down the recombination rate between electrons and holes and improving the photocatalytic activities of the ZnFe 2 O 4 /BiVO 4 /rGO. Liquid chromatography-mass spectrometry (LC-MS) analyses were deployed to figure out intermediate substances and possible degradation pathways of the OTC degradation process. The ZnFe 2 O 4 /BiVO 4 /rGO heterojunction exhibited a pretty good durability and stability, and was easily recovered with the aid of a magnet. The toxicity of the by-products was significantly declined compared to the OTC antibiotic.
研究领域:
环境科学
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Hao Zhang,Siyuan Gao,Zeyao Feng,Zhen Sun,Xianwen Yan,Zhenhua Li,Xueli Yang,Guofeng Pan,Ye Yuan,Lanlan Guo
Room temperature H 2 S gas sensor with low detection limit is necessary for practical application. In this work, ZnFe 2 O 4 was synthesized through a simple solvothermal method, and then CuO was decorated onto the surface of ZnFe 2 O 4 via a modified metal organic framework synthesis method . After a series of characterization methods, it was found that CuO/ZnFe 2 O 4 had porous nanosphere morphology. Gas sensing measurements indicating that the synthesized CuO/ZnFe 2 O 4 porous spheres exhibited excellent H 2 S sensing performance under room temperature, including high sensitivity under low concentration (less than 10 ppm), excellent selectivity, low limit of detection (0.1 ppm), good repeatability, and fast response/recovery time. The sensing mechanism was discussed in detail, which is mainly contributed to the sensitization effect of CuO. This work provides a new strategy for constructing room temperature H 2 S gas sensor based on ZnFe 2 O 4 .
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2018
·
IF 3.609
Jun Xiao,Weiyi Yang,Shuang Gao,Caixia Sun,Qi Li
A one-pot, solvent-thermal process was used to create the ultrafine ZnFe 2 O 4 nanoparticles photocatalyst . During the solvent-thermal process, the in situ self-forming NaCl not only served as a “cage” to confine the ion diffusion, but also acted as a microreactor for nanocrystallite growth. An average particle size of ∼10 nm and a high-specific surface area of ∼112.9 m 2 /g were observed for the ultrafine ZnFe 2 O 4 nanoparticles Owing to the synergistic effect of ultrafine particle size, the full utilization of the visible light region and high conduction band (CB) position, ultrafine ZnFe 2 O 4 photocatalyst displayed an efficient photocatalytic CO 2 reduction under visible light illumination. Besides, the ultrafine ZnFe 2 O 4 photocatalyst showed high production selectivity for CH 3 CHO and C 2 H 5 OH generation in aqueous CO 2 /NaHCO 3 solution. This work may provide a new idea for the synthesis of new high-efficiency photocatalysts.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Cong Zheng,Cheng Zhang,Kui Zhang,Jian Zhang,Ling Jin,Abdullah M. Asiri,Khalid A. Alamry,Lifang He,Xiangfeng Chu
The design and synthesis of materials with unique hierarchical structure has important scientific and practical significance in improving their sensing properties. Herein, ZnFe 2 O 4 nanoparticles assembled nanosheets (ZnFe 2 O 4 NSs) grown on reduced graphene oxide (RGO) was creatively constructed via a simple and fast microwave-assisted solvothermal method. RGO played the role as ground for the growth of ZnFe 2 O 4 NSs, and the growing process was investigated by a series of irradiation time dependent experiments. Finally, the gas sensing properties for the as-prepared ZnFe 2 O 4 NSs/RGO composites were evaluated. The integration of RGO was found to increase the selectivity of ZnFe 2 O 4 to ethanol. It was found that the ZnFe 2 O 4 NSs/RGO composite with an irradiation time of 4 h (ZnFe 2 O 4 NSs/RGO 4 h) based sensor showed better ethanol sensing performance than that of sensors based on ZnFe 2 O 4 NSs assembled sphere without RGO, ZnFe 2 O 4 nanoparticles and ZnFe 2 O 4 NSs/RGO composites with other irradiation time, respectively. ZnFe 2 O 4 NSs/RGO 4 h based sensors showed good stability and satisfied response to ethanol ranging from 0.1 ppm to 100 ppm at 210℃. The high response was attributed to its unique architecture, the integration of RGO and the formation of heterojunction between RGO and ZnFe 2 O 4 .
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）