JOURNAL OF ALLOYS AND COMPOUNDS
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2017
·
IF 3.133
Ying Lin,Jiahao Zhang,Meng Li,Lei Wang,Haibo Yang
Herein, coral-like ZnFe 2 O 4 particles were prepared by a stepwise strategy, which contains a synthesis process and a subsequent etching process. Etching process can greatly improve the specific surface area of the ZnFe 2 O 4 . The specific surface area of the coral-like ZnFe 2 O 4 particles is 200 times larger than that of the un-etched ZnFe 2 O 4 particles. The ferric ion of ZnFe 2 O 4 can be reduced gradually by hydrazine to form Fe 2+ , which will be coordinated with methyl mercaptoacetate to dissolve in DMF. Etched coral-like ZnFe 2 O 4 particles have been tested as an electrode material for supercapacitor through electrochemical analysis . Etched coral-like ZnFe 2 O 4 particles display a larger specific capacitance (∼471 F g −1 ) than the un-etched ZnFe 2 O 4 particles (∼162 F g −1 ) at a scan rate of 2 mV s −1 . An excellent stability of cycling performance with 80.6% specific capacitance retention after 3000 cycles can be achieved. The results suggest that the as-prepared coral-like ZnFe 2 O 4 particles might be of potential application for supercapacitor electrode materials. The strategy paves an efficient way for synthesizing new ferrite particles with high specific surface area for the electrode material of supercapacitor.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2019
·
IF 4.916
Wenqi Li,Jing Zhang,Wenli Zhu,Peige Qin,Qian Zhou,Minghua Lu,Xuebin Zhang,Wuduo Zhao,Shusheng Zhang,Zongwei Cai
Reduced graphene oxide/ZnFe 2 O 4 (rGO/ZnFe 2 O 4 ) nanocomposite was facile prepared and applied as magnetic sorbent for the extraction of estrogens including 17β-estradiol, 17α-estradiol, estrone and hexestrol from water, soil, and fish samples prior to HPLC analysis. The rGO/ZnFe 2 O 4 nanocomposite was characterized by scanning electron microscope, Fourier transform-infrared spectroscopy, X-ray diffraction, and vibrating sample magnetometer. The experimental parameters affecting the efficiency of magnetic solid-phase extraction (MSPE) including the amount of material, extraction time, pH, temperature, desorption solvents, desorption time, and desorption solvent volume were investigated respectively. With the developed method, good linearity was observed in the range of 0.05–500 ng/mL with the correlation coefficients (R 2 ) between 0.9978 and 0.9993. The limits of detection (S/N = 3) and limits of quantification (S/N = 10) were achieved at 0.01–0.02 ng/mL and 0.05 ng/mL, respectively. The enrichment factors were calculated as the range of 241–288. Using rGO/ZnFe 2 O 4 nanocomposite as the sorbent, the developed MSPE followed by HPLC analysis, was applied to analysis of estrogens in river water, soil and fish samples. The method has the potential application in the extraction and preconcentration ultra trace compounds in complex matrices, such as environmental and biological samples.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 21
·5663-5672
·
IF 7.779
Qixuan Qin,Asu Li,Yizhuo Fan,Xindong Zhang
In this work, Au nanoparticle-loaded ZnO/ZnFe2O4 (Au-ZnO/ZnFe2O4) microspheres were prepared using a combination of a two-step hydrothermal process and a co-precipitation method. The SEM and TEM analyses showed that the synthesized Au-ZnO/ZnFe2O4 samples were microspheres with a yolk–shell structure assembled from nanosheets. Gas-sensitive performance tests indicated that Au-ZnO/ZnFe2O4 showed the highest response to 100 ppm acetone (18.18), higher than those of ZnFe2O4 (8.4) and ZnO/ZnFe2O4 (11.6). In addition, the optimum operating temperature of Au-ZnO/ZnFe2O4 decreased from 279 to 206 °C compared to ZnFe2O4 and ZnO/ZnFe2O4. In addition, Au-ZnO/ZnFe2O4 yolk–shell microspheres exhibited fast response and recovery times (4 and 23 s, respectively). The sensor has a lower limit of acetone detection (0.7 ppm) at 85% RH and is able to effectively differentiate diabetic patients from healthy subjects by detecting acetone in their exhaled breath. The enhanced response of Au-ZnO/ZnFe2O4-based sensor is attributed not only to its high specific surface area but also to the synergistic effect of the n–n heterojunction structure of ZnO-ZnFe2O4 and the catalysis of Au nanoparticles.
研究领域:
材料科学
·
医学诊断
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Yuhang Wei,Qingpeng Zhu,Weiwei Xie,Xinyue Wang,Song Li,Zhiming Chen
Efficient and convenient treatment of industrial dyeing wastewater is of a great significance to guarantee human and animal health. This work presented the enhanced catalytic activity at pH 3.0 of laccase immobilized on amino-functionalized ZnFe 2 O 4 nanoparticles (ZnFe 2 O 4 -laccase) and its application for degradation of textile dyes. Due to the existence of a large number of oxygen vacancies on the surface of the ZnFe 2 O 4 nanoparticles, negative ions accumulated on the magnetic carriers, which resulted in a harsh optimal pH value of the ZnFe 2 O 4 -laccase. Laccase activity assays revealed that the ZnFe 2 O 4 -laccase possessed superior pH and thermal stabilities, excellent reusability, and noticeable organic solvent tolerance. Meanwhile, the ZnFe 2 O 4 -laccase presented efficient and sustainable degradation of high concentrations of textile dyes. The initial decoloration efficiencies of malachite green (MG), brilliant green (BG), azophloxine, crystal violet (CV), reactive blue 19 (RB19) and procion red MX-5B were approximately 99.1%, 95.0%, 93.3%, 87.4%, 86.1% and 85.3%, respectively. After 10 consecutive reuses, the degradation rates of the textile dyes still maintained about 98.2%, 92.5%, 83.2%, 81.5%, 79.8% and 65.9%, respectively. The excellent dye degradation properties indicate that the ZnFe 2 O 4 -laccase has a technical application in high concentrations of dyestuffs treatment.
研究领域:
环境科学
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生物技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Chunlei Wang,Xing Tan,Juntao Yan,Bo Chai,Jianfen Li,Shizhong Chen
Magnetic ZnFe 2 O 4 /ZnO (ZFO/ZnO) multi-porous nanotubes have been first fabricated via a facile electrospinning and subsequent calcination process. A series of ZFO/ZnO photocatalysts with different ZFO molar content and morphologies are also obtained by varying the molar ratio of Zn/Fe metal salt and its dosage. The morphology, composition, crystal structure and specific surface area of achieved photocatalysts are systematically examined. TEM images demonstrate ZFO/ZnO-3 multi-porous nanotubes possess perfect 1D nanotube profile with hierarchical pores. HRTEM images confirm the formation of ZFO/ZnO heterojunctions. DRS spectra show that ZFO/ZnO-3 multi-porous nanotubes exhibit an enhanced absorption both in UV and visible-light region. PL spectra and photocurrent responses of ZFO/ZnO-3 multi-porous nanotube demonstrated that the photogenerated electrons and holes are effectively separated. Above all, ZFO/ZnO-3 multi-porous nanotubes photocatalysts with a larger specific surface area of 57.79 m 2 g −1 exhibit the best photocatalytic efficiency of 99% after 150 min under the solar irradiation for the decolorization of RhB. Moreover, ZFO/ZnO photocatalysts not only possess magnetic separation property, but also keep a relatively high photocatalytic efficiency even after four cycles, which is beneficial for practical application. In addition, both the formation and potential photocatalytic mechanisms of ZFO/ZnO-3 multi-porous nanotubes are proposed in detail.
研究领域:
材料科学
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环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2023
·Vol. 13
·期 1
·1-12
·
IF 4.6
Zhao Xuying,Li Wei,Gao Junyi,Li Caibin,Xiao Yansong,Liu Xue,Song Dean,Zhang Jiguang
Tetracycline (TC) is a widely used antibiotic that adversely affects ecosystems and, therefore, must be removed from the environment. Owing to their strong ability to oxidise pollutants, including antibiotics, and selectivity for these pollutants, an improved oxidation method based on sulphate radicals (SO4· − ) has gained considerable interest. In this study, a novel technique for removing TC was developed by activating peroxymonosulphate (PMS) using a ZnFe 2 O 4 catalyst. Using the co-precipitation method, a ZnFe 2 O 4 catalyst was prepared by doping zinc into iron-based materials, which increased the redox cycle, while PMS was active and facilitated the production of free radicals. According to electron paramagnetic resonance spectroscopy results, a ZnFe 2 O 4 catalyst may activate PMS and generate SO 4 · − , HO·, O 2 · − , and 1 O 2 to eliminate TC. This research offers a new method for creating highly effective heterogeneous catalysts that can activate PMS and destroy antibiotics. The study proposes the following degradation pathways: hydroxylation and ring-opening of TC based on the products identified using ultra-performance liquid chromatography-mass spectrometry. These results illustrated that the prepared ZnFe 2 O 4 catalyst effectively removed TC and exhibited excellent catalytic performance.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2024
·
IF 5.5
Bo Wang,Zhenxing Wang,Yu Wan,Yimu Wang,Shuang Gao,Yan Chen,Qingsong Luo,Changhao Feng
Background Developing high-performance n -butanol gas sensors is of great significance for environmental protection and human health. The Bi-doped ZnFe 2 O 4 nanofibers exhibit promising potential as a viable option for n- butanol sensors. Methods In this study, a series of high response and fast response n -butanol gas sensors were successfully fabricated by Bi-doped ZnFe 2 O 4 nanofibers with different atomic percentages (0 %, 1 %, 3 %, 5 %), which were synthesized by a facile electrospinning method. Significant findings The nanofibers with a Bi/Zn molar ratio of 3 % showed a response value of 23.6 to 100 ppm n -butanol at 175 °C, which was 2.4 times higher than that of the pure ZnFe 2 O 4 nanofibers, and with a lower concentration detection limit (1.5 for 100 ppb n -butanol). In addition, the gas sensing materials had a good selectivity and long-term stability to n -butanol, and the mechanism of the good sensing performance of Bi doped ZnFe 2 O 4 nanofibers for n -butanol is also analyzed in this paper.
研究领域:
材料科学
·
环境科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2017
·Vol. 4
·期 6
·935-945
·
IF 4.036
Jiantao Feng,Yechen Wang,Yanhui Hou,Liangchao Li
A series of yolk–shell ZnFe2O4@reduced graphite oxide@TiO2 (ZFO@RGO@TiO2) microspheres with different void sizes and TiO2 shell thicknesses has been successfully synthesized by combining a layer-by-layer coating process and chemical etching route. Compared to pure ZFO and hierarchical ZFO@SiO2@RGO@TiO2, the as-synthesized yolk–shell microspheres exhibited significantly enhanced microwave absorption properties in terms of effective bandwidth and reflection loss. Among these, the minimum reflection loss of the as-synthesized yolk–shell microspheres with a thickness of 2.6 mm could reach up to −44.3 dB at 15.92 GHz, and their effective absorption bandwidth at less than −10 dB was 4.1 GHz. In addition, as the shell thickness of the yolk–shell microspheres decreased, the frequency corresponding to the minimum reflection loss shifted to the high-frequency range. Hence, these obtained yolk–shell microspheres are potential new candidates for high-frequency shielding and lightweight microwave 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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Xiaojin Fu,Sijie Li,Jing Wen,Fuyan Kang,Congying Huang,Xiaogang Zheng
ZnFe 2 O 4 -coated Ag nanowires (Ag@ZnFe 2 O 4 NWs) were prepared for the photo-Fenton induced dehydration of fructose into 5-hydroxymethylfurfural (5-HMF) in visible light region. Effects of ZnFe 2 O 4 content, volume ratio of dimethyl sulfoxide (DMSO) to deionized water, reaction temperature, fructose dosage, H 2 O 2 content, pH values, inorganic ions, and quenchers on the fructose conversion, 5-HMF yield, and 5-HMF selectivity were performed in detail. Among these obtained composites, Brønsted acidic Ag@ZnFe 2 O 4 NWs with Ag NWs diameter of around 20 nm and ZnFe 2 O 4 coating of 6.13 wt% exhibit the best photo-Fenton catalytic activity for the conversion of fructose into 5-HMF, and slightly deactivate after five cycle times. The surface plasmon resonance effect of Ag NWs and the synergistic effect between ZnFe 2 O 4 and Ag NWs are favorable for the visible light absorption and the efficient transfer and separation of charge carriers. DMSO as well as OH radical plays the vital role in the photo-Fenton induced dehydration of fructose into 5-HMF.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Zhiming Li,Zhiqiang Wei,Meijie Ding,Qingsong Yu,Jinglong Bai,Huining Zhang
Problems such as bacterial resistance caused by tetracycline antibiotics pose a serious threat to human production and life and ecosystems. We prepared ZnFe2O4@ZnWO4 heterojunction nanocomposites using hydrothermal and coprecipitation methods. The micromorphology, structure, and photoelectrochemical properties were analyzed. In combination with the presence of H2O2, the photo-Fenton activity of the antibiotic tetracycline at high concentration was tested under visible light irradiation, and its catalytic mechanism was investigated. The results showed that the composition of the composite heterojunction improved the catalytic activity of the catalyst. At a pollutant concentration of 50 mg L–1 and pH 5, 30% ZnWO4/ZnFe2O4 degraded 92.1% of tetracycline in 60 min with a degradation rate of 0.0295 min–1, which was 6.7 times higher than that of pure ZnFe2O4. The results of free radical trapping experiments and electron spin resonance techniques indicated that hydroxyl radical (•OH) and superoxide radical (O2–) played important roles in the photo-Fenton degradation of tetracycline. Notably, the catalyst maintained a high degradation rate (80%) after five cycles. ZnFe2O4 introduced in this article may provide a promising strategy for achieving strong light absorption and is authoritative in meeting future environmental requirements.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Zhichao Miao,Jiyao Tao,Shaoyuan Li,Jian Wu,Zhao Ding,Xiuhua Chen,Wenhui Ma,Hua-Jun Fan
The popcorn-shaped ZnFe 2 O 4 (ZFO) nanospheres has been produced by one-pot synthesis method. CdS nanoparticles (NPs) were subsequently loaded onto the surface of porous ZnFe 2 O 4 through the successive ion layer adsorption (SILAR) process. The microstructure, composition , and degradation ability of ZFO/CdS NPs composites have been examined in-depth. Under the four SILAR cycles, the resulting ZFO/CdS NPs (FS4) composite displayed the maximum degradation efficiency of 93.2% for rhodamine B (RhB) in 40 min, and which maintained high photocatalytic activity and a stable structure after five reuse. The heterojunction between CdS and ZFO can dramatically improves the separation efficiency of photo-generated electron-hole pairs, thus boosts catalytic activity. Meanwhile, the radical scavenging investigations have demonstrated that the superoxide radicals as the principal reactive group participate in the photocatalytic reactions. The proposed ZFO/CdS NPs composites shows high photocatalytic ability and convenient magnetic recycling. This work not only provide a practical green synthesis path, but also offers new insight onto the formation of high-efficiency heterojunction photocatalysts .
研究领域:
材料科学
·
环境科学
·
纳米技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 55
·34609-34617
·
IF 3.108
Xiang Ma,Xinyuan Zhou,Yan Gong,Ning Han,Haidi Liu,Yunfa Chen
ZnO/ZnFe2O4 hollow cube composites with heterogeneous structure are synthesized by a facile strategy through simple and direct pyrolysis of FeIII-modified Zn-based metal–organic frameworks. The as-synthesized ZnO/ZnFe2O4 hollow cubes have well-defined cube morphology with an ∼2 μm and multiple porous shell constructed from interpenetrated ZnO and ZnFe2O4 heterogeneous nanoparticles, providing structurally combined mesoporous channels for facilitating the diffusion and surface reaction of gas molecules. In addition, a comparative sensing performance investigation between ZnO/ZnFe2O4 hollow cubes and singular ZnO demonstrates that, in contrast with ZnO, the ZnO/ZnFe2O4 hollow cubes show significantly enhanced chemical sensing sensitivity towards low-concentration acetone. Furthermore, the ZnO/ZnFe2O4 hollow cubes exhibit good reproducibility and selectivity towards gaseous acetone. The enhanced sensing performance of the MOF-derived ZnO/ZnFe2O4 hollow cubes is ascribed to the unique hierarchical structure with high specific surface area, abundant exposed active sites with surface-adsorbed oxygen species and heterojunctions formed at the interfaces between ZnO and ZnFe2O4.
研究领域:
材料科学
·
传感器技术
·
纳米科技
✓ 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）