MICROCHIMICA ACTA
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2021
·Vol. 188
·期 3
·1-9
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IF 5.833
Xian Zhiquan,Zhang Li,Yu Ying,Lin Bixia,Wang Yumin,Guo Manli,Cao Yujuan
A nanozyme based on CoFe 2 O 4 modified with MoS 2 was constructed for colorimetric determination of cysteine (Cys) and glutathione (GSH). Firstly, ferrite CoFe 2 O 4 is synthesized, and it is then modified by MoS 2 to form a flower-like polymer (MoS 2 @CoFe 2 O 4 ). In the presence of H 2 O 2 , a redox interaction takes place, and the resulting hydroxyl promoted a colorimetric conversion from colorless to blue in the presence of 3,3′,5,5′-tetramethylbenzidine (TMB). However, once Cys or GSH is added, they are capable to compete with the interaction of the hydroxyl with TMB, resulting in an inhibition of the colorimetric conversion. The colorimetric distinction is sensitive to the amount of target. The results obtained proved that the catalytic efficiency of MoS 2 @CoFe 2 O 4 is 4.4-fold and 1.8-fold to that of MoS 2 and CoFe 2 O 4 . Meanwhile, the K m values to TMB and H 2 O 2 are 0.067 and 0.048 mM, respectively, which are 6.5-fold and 77-fold, respectively smaller than those of natural peroxidase such as HPR. This indicates that the MoS 2 @CoFe 2 O 4 possesses a favorable interaction affinity. Additionally, the colorimetric distinction caused by the competition between TMB and cysteine or glutathione is obvious. The signal responses to cysteine and glutathione are linear in the range 0.5~15 μM and 0.5~35 μM, and the LODs are 0.10 and 0.21 μM, respectively. In practical assay of Cys in serum, the RSD of the sample tests is 4.6%, and the recoveries for the spiked assays are 95.3% and 96.0% with the RSD of 2.1% and 4.2%, respectively. Graphical abstract
研究领域:
生物化学
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分析化学
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2017
·Vol. 33
·期 5
·590-600
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IF 1.673
Jie Yin,Liang Shen,Yuxuan Li,Min Lu,Ke Sun,Pinxian Xi
The transition metal compound catalysts have been taken a great part in renewable energy conversion and storage systems. Herein, we report the uniform CoFe2O4 nanoparticles with abundant oxygen vacancies and specific active surface exposed through the simple hydrothermal reaction for improving the electrocatalytic performance and stability. They show good electrocatalytic performance for hydrogen evolution reaction in 0.5 M H2SO4 with an onset potential of 20 mV, the overpotential of 45 mV (at j = 10 mA/cm2), and remarkable long-term stability more than 100 h at different current densities and better oxygen reduction reaction activity with lower overpotential in 0.1 M KOH. Moreover, the home-made primary Zn–air batteries, using CoFe2O4 nanoparticles as an air–cathode display the high open-circuit voltage of 1.47 V and the maximum power density of 142 mW/cm2. The two-series-connected batteries fabricated by CoFe2O4 nanoparticles can support a light-emitting diode to work for more than 48 h.
研究领域:
材料科学
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电化学
·
能源存储与转换
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Rabigul Tursun,Yuchang Su,Jing Zhang,Reyimuaji Yakefu
In this study, different volume ratios (NiTiO 3 : CoFe 2 O 4 = 1:3, 2:3, 1:1) of NiTiO 3 /CoFe 2 O 4 composites were synthesized using the sol-gel method. The effects of different NiTiO 3 volume ratios on the structural, morphological, magnetic, and microwave properties were systematically investigated by X-ray diffraction spectroscopy (XRD), field-emission scanning electron microscopy (FE-SEM), Raman spectroscopy (RAMAN), vibrating-sample magnetometery (VSM), and vector network analysis. Electromagnetic wave absorption analysis indicated that 1:3 composite sample showed the greatest reflection loss (−21.7 dB at 17.1 GHz frequency) at a thickness of 10.0 mm. The microwave absorbing properties decrease with the increasing NiTiO 3 volume ratio. The observed improvement can be attributed to the low degree crystallization of NiTiO 3 that increases magnetic losses through increased exchange resonance.
研究领域:
材料科学
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电磁学
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物理学
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DOI
高影响因子
Electrocatalysis
·
2024
·Vol. 15
·期 4
·344-352
·
IF 2.7
Zhang Xihuan,Jaouhari Abdelhadi El,Li Chunyue,Adnane Maimoune,Liu Wanying,Mellalou Abderrahman,Ghamouss Fouad,Lin Yuanhua
The oxygen evolution reaction (OER) holds pivotal importance in sustainable energy conversion, as it forms the critical half-reaction in various electrochemical processes, including water splitting for hydrogen production and rechargeable metal-air batteries. Here, a CoFe 2 O 4 @Co 3 O 4 nano-composite was synthesized using a facile hydrothermal process and deposited onto the surface of nickel foam through electrophoresis. Characterization using XRD, Raman spectroscopy, and XPS confirmed the successful synthesis of the composite, exhibiting characteristic peaks of both Co 3 O 4 and CoFe 2 O 4 . The nano-composite exhibited a more amorphous phase than pure oxides, benefiting electrocatalytic activity. Scanning and transmission electron microscopy highlighted the composite’s morphological characteristics, showcasing a Co 3 O 4 island distribution on the CoFe 2 O 4 surface. Electrochemical evaluations revealed the superior oxygen evolution reaction (OER) performance of CoFe 2 O 4 @Co 3 O 4 , with low overpotentials, faster kinetics, and enhanced stability compared to pure oxides and the benchmark RuO 2 catalyst. A comprehensive analysis was carried out to investigate the dynamic behavior during electrocatalytic oxygen evolution reaction. This study unveils the intricate charge and electron transfer mechanisms between cobalt and iron atoms, providing insights into their collaborative role throughout the OER process. Graphical Abstract
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 6
·48345
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IF 2.188
Libo Wang,Yuchang Su,Jing Zhang,Hongzhi Zhang,Qiaoqiao Dong
PVDF-CoFe 2 O 4 (CFO) thick membranes were synthesized by solvent casting method. The mixed organic solvents consist of N-methyl-2-pyrrolidone (NMP) and Ethyl acetate (EA), in which the mass ratios of NMP and EA (NMP:EA = 1:0, 1:1, and 1:2) and the temperature of solvent evaporation (range from 50 to 80 °C) has been considered. The phase structure, β-PVDF phase content, and electrical and magnetic properties of these membranes were investigated to reveal the effect of EA addition and temperature on these properties. Results manifest that all samples showed coexistence of ferroelectric and ferromagnetic properties at room temperature. EA addition makes film more compact, which may be responsible for the differences in ferromagnetic properties. Adding EA and enhancing temperature resulted in phase transition of PVDF from α and γ to β, which contributed to membranes’ ferroelectric performances. In all samples, NMP:EA = 1:2 treated at 80 °C exhibits the maximum β-phase fraction and polarization (Pmax) of 87.2% and 2.398 μC cm −2 , respectively. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48345.
研究领域:
材料科学
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物理学
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DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2019
·Vol. 16
·期 12
·2187
·
IF 2.468
Yue Teng,Zhiying Liu,Ke Yao,Wenbin Song,Yongjun Sun,Hailing Wang,Yanhua Xu
The use of attapulgite (ATP)-based materials for adsorption of pollutants from water and wastewater has received growing attention. However, recovering ATP-based adsorbents remains a challenge. In this study, a magnetic adsorbent ATP/CoFe2O4with high tannic acid (TA) adsorptive capacity was fabricated via a facile co-precipitation approach and was well characterized. The loaded CoFe2O4particles were embedded into the adsorbent surfaces to allow magnetic separability. For this material, its TA adsorption kinetics, isotherm behavior, and magnetic separation efficiency are reported. The developed magnetic composites had rapid sorption kinetics of 3 h, high sorption capacity of 109.36 mg/g, and good magnetic separation efficiency of 80%. The used ATP/CoFe2O4was successfully regenerated by NaOH and reused five times without a substantial reduction in TA removal and magnetic performance. Intermolecular hydrogen bonding formation and surface complexation were identified as the sorption mechanisms of TA by ATP/CoFe2O4.Keywords:attapulgite;adsorption;CoFe2O4magnetic nanoparticle;tannic acid
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
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2024
·
IF 7.7
Meng Zhang
The use of modified clays can play an effective role as an effective adsorbent in removing fluoride (Flu) ions from water and aqueous solutions. In the present research, montmorillonite clay (MMt) was modified using CoFe 2 O 4 magnetic particles and Al–Fe fumarate metal-organic framework (Al–Fe Fum) and was utilized as an efficient adsorbent for removing Flu from aqueous solution. The properties of MMt and MMt/CoFe 2 O 4 /Al–Fe Fum samples were investigated using different techniques. The results showed that with the modification of MMt using CoFe 2 O 4 magnetic particles and the metal-organic framework of Al–Fe Fum, the BET surface has increased notably from 13.217 to 365.80 m 2 /g. To investigate the effect of independent variables and their interaction on the efficiency of the Flu adsorption, response surface method-central compound design (RSM-CCD) was served. Based on the results of ANOVA, the F-value and p-value parameters for the desired model were determined to be 783.09 and < 0.0001, respectively, which confirms the success and high ability of the model. The number of R 2 , adjusted R 2 , and Predicted R 2 for adsorption of Flu ion was determined to be 0.998, 0.997, and 0.995, respectively, which shows that the proposed regression model can describe the process of adsorption and interaction between variables well. Compared to other kinetic models, the pseudo 2nd order kinetic model has a greater ability to describe the Flu adsorption behavior. The R 2 parameter value determined that the Freundlich isotherm model has a suitable ability to investigate the isotherm behavior and confirms the effect of heterogeneous surfaces in the process. Generally, the outcomes signified that the MMt and MMt/CoFe 2 O 4 /Al–Fe Fum samples can be reused several times in the process of Flu adsorption, while the efficiency is more than 90%.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 2
·590-597
·
IF 5.934
Xiaoqing Cui,Wei Liu,Weihua Gu,Xiaohui Liang,Guangbin Ji
In recent years, two-dimensional inorganic materials (MoS2) have been promising candidates for EM wave absorber because of their high specific surface area, excellent electronic properties and dielectric loss caused by polymorphism. Nevertheless, the poor impedance matching of individual MoS2 limited its microwave absorption performance. Optimizing the impedance matching of microwave absorber can be an effective way to achieve electromagnetic wave attenuation. In this study, we deposited CoFe2O4 magnetic nanoparticles on the surface of MoS2 nanosheets using reasonable hydrothermal reactions to optimize its poor impedance and enhance interfacial polarization. The MC-6 composite (mMoS2 : mCoFe2O4 = 6 : 1) exhibited excellent microwave absorption capability. The minimum reflection loss (RL) reached −55.3 dB at 16.24 GHz (Ku band) and the effective absorption bandwidth (<−10 dB) was measured to be 6.26 GHz (X band) with a thickness of 1.6 mm. This study confirms that optimizing impedance matching and interfacial polarization of MoS2-based composites play a key role in the microwave response. Moreover, the reasonable optimization of impedance matching enables regulation of the effective bandwidth and strong absorption intensity.
研究领域:
材料科学
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电磁学
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DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
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2024
·Vol. 89
·期 12
·3309-3324
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IF 2.5
Xu Shanshan,Yang Yi,Li Fanxiu
View large Download slide View large Download slide Close modal Polyacrylamide (PAM) in environmental water has become a major problem in water pollution management due to its high molecular mass, high viscosity and non-absorption by soil. CoFe 2 O 4 with strong magnetic properties was prepared by solvent-thermal synthesis method and used as the catalyst for the removal on PAM in heterogeneous Electro-Fenton (EF) system. It showed that the removal efficiency of PAM by the heterogeneous EF system using CoFe 2 O 4 catalyst was 92.01% at pH 3 after 120 min. Further studies indicated that ·OH was the most significant active species for the removal of PAM, and the contribution of ·O 2 − and SO 4 ·− for the removal of PAM was less than 15%. The reusability test and XRD, XPS, FTIR analyses proved that the catalyst had good stability. After a repeated use for five times, the catalyst still had a high PAM removal rate and stable structure. The valence distribution and functional groups of the phase components of the catalyst did not change significantly before and after the reaction. The possible mechanism of catalyst activation of H 2 O 2 was deduced by mechanism investigation. The CoFe 2 O 4 is an efficient and promising catalyst for the removal of PAM wastewater. A Co–Fe bimetallic oxide catalyst was prepared by hydrothermal method and used to treat polymer-containing wastewater. The prepared catalyst has strong magnetic properties, is easy to recover and can be reused (resource reuse). In the CoFe 2 O 4 heterogeneous system, the higher contaminant removal rate can be achieved with less catalyst dosage.
研究领域:
环境科学
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水处理工程
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DOI
PubMed
高影响因子
E-POLYMERS
·
2022
·Vol. 22
·期 1
·214-222
·
IF 3.074
Haipeng Cui,Pengfei Zhao,Lusheng Liao,Yanfang Zhao,Aichun Long,Jianhe Liao
Designing versatile rubber as a multifunctional elastomer is of great importance, incorporating it with biomass-derived nanoblocks will mitigate environmental challenges. Here biosynthesized natural rubber (NR) composites with CoFe 2 O 4 -immobilized biomass carbon (BC) derived from macadamia nutshells were fabricated by facile mechanical mixing. Morphological analysis indicates that CoFe 2 O 4 nanoparticles are uniformly anchored on the surface of BC, forming intact electromagnetic loss networks in NR matrix. As a consequence, the as-fabricated NR/CoFe 2 O 4 @BC composites demonstrate enhanced mechanical, thermal, and electromagnetic performance. Particularly, NR/CoFe 2 O 4 @BC composite shows the best microwave attenuation capacity when CoFe 2 O 4 @BC loading is 40 phr, with the minimum reflection loss (RL) of −35.00 dB and effective absorption bandwidth (RL < −10 dB) of 1.60 GHz. All results indicate that this work open new paradigm for multiple applications based on biosynthetic elastomer with the sustainable biomass derived nanoblocks.
研究领域:
材料科学
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环境科学
·
纳米技术
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2024
·
IF 5.1
M.O. Abdel-Salam,Youngsoo Kim,Yasser M. Moustafa,Taeho Yoon
Green hydrogen is a crucial element in the hydrogen value chain, encompassing hydrogen production, transportation, storage, and application. The production of green hydrogen via NaBH 4 hydrolysis (SBH) entails a high cost. However, the fast kinetics of this process with a catalyst compensate for the substantial cost, especially in specific applications, such as local or intermittent use. Silver is known for its excellent catalytic properties. Its high catalytic activity is a key factor in achieving efficient hydrogen generation from (SBH). In this study, a nanocomposite catalyst composed of silver nanoparticles (AgNPs), CoFe 2 O 4 , and carbon nanotubes (CNT) was investigated to demonstrate an effective catalyst design approach to achieve enhanced hydrogen generation performance. The H 2 production rate in the presence of Ag-based/CoFe 2 O 4 –CNT was 320 mL min −1 g −1 , and the apparent activation energy was 14.7 kJ mol −1 , superior to that of Ag-based catalysts reported in the literature. Analyses of the observed outcomes revealed that the CNT was decorated with well-dispersed AgNPs and CoFe 2 O 4 nanoparticles. The synergistic effects of AgNPs, CoFe 2 O 4 , and CNT were demonstrated by analyzing the kinetic behaviour of each component based on systematic comparisons. Furthermore, the paramagnetic property of CoFe 2 O 4 enables harvesting of the catalyst using an external magnetic field, and it was verified that the reactivity of the collected catalyst was maintained throughout seven successive cycles. The outstanding catalytic performance of Ag/CoFe 2 O 4 – CNT should be attributed to the uniform dispersion of nanoparticles on the CNT surface. Furthermore, our key approach for developing efficient Ag-based carbon advanced catalysts for SBH in the future is to ensure their suitability for industrial applications.
研究领域:
材料科学
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催化化学
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能源科学
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Qingyun Song,Yiping Feng,Zhu Wang,Guoguang Liu,Wenying Lv
The aryl organophosphate flame retardant triphenyl phosphate (TPhP) has been frequently detected in environment and biota, and the potential risks of TPhP to aquatic organisms have also been demonstrated. The degradation of TPhP by CoFe 2 O 4 activated peroxymonosulfate (PMS) was studied in this work. At initial pH of 7.0, 10 μM TPhP could be removed by 99.5% with 0.25 g/L CoFe 2 O 4 and 0.5 mM PMS after 6 min oxidation, indicating the excellent performance of CoFe 2 O 4 activated PMS process on the treatment of TPhP. The influence of PMS and CoFe 2 O 4 dosage, initial pH, humic acid (HA), and anions (Cl − , NO 3 − , and HCO 3 − ) on TPhP degradation were investigated systematically. Results showed that the degradation of TPhP was enhanced with increasing PMS concentrations from 0.1 to 1 mM, while it reduced as CoFe 2 O 4 dosage increased. TPhP degradation efficiencies depended on solution pH with neutral pH showing the optimum degradation conditions. Recycling experiment indicated that the CoFe 2 O 4 nanoparticles (NPs) possessed high potential for reusability. The radical identification experiments were performed and SO 4 • − was confirmed as the dominant radicals in TPhP degradation, and activation mechanism of PMS by CoFe 2 O 4 NPs was hence explained. Humic acids (HA) (2–20 mg/L) as the representative organic natural matter existing in environment inhibited TPhP removal. Anions including Cl − , NO 3 − , and HCO 3 – all reduced TPhP degradation. In addition, TPhP degradation products were identified by liquid chromatography-mass spectrometry, and the degradation pathways of TPhP were proposed accordingly.
研究领域:
环境科学
·
化学工程
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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）