SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Wangzhe Xia,Fei Zhao,Pai Fang,Mingze An,Junjiang Zhu,Kai Cheng,Minggui Xia
Magnetic iron oxides are usually employed as main components of 4-nitrophenol (4-NP) reduction catalysts. Here, magnetic Fe 3 O 4 nanoparticles (Rec-Fe 3 O 4 ) recycled from rolling oil sludge (ROS) were directly applied in 4-NP reduction reaction. The Rec-Fe 3 O 4 nanoparticles were high purity of Fe 3 O 4 with 0.9 % C content, which were further probed as carboxylates and hydrocarbon alkyl species. Compared with commercial nano-Fe 3 O 4 (Com-Fe 3 O 4 ), the Rec-Fe 3 O 4 exhibited excellent 4-NP reduction performance with easy magnetic separation showing complete 4-NP conversion to 4-AP within 270 s, and its activity remained stable even after 5 consecutive cycles. Its activation energy was also estimated to be far much less than that of Com-Fe 3 O 4 . Benefiting from its special spontaneous formed Fe 3 O 4 @C structure during ROS generation, more active low valence Fe species remained and C shell accelerated electronic transfer on the Rec-Fe 3 O 4 surface, both of which led to superior activity during 4-NP reduction reaction. This finding opens up a new insight to both of utilizing ROS waste resource and green synthesis of highly efficient 4-NP reduction catalysts.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
Biomolecules
·
2019
·Vol. 9
·期 6
·245
·
IF 4.694
Jun Liu,Shuai Dong,Quanguo He,Suchun Yang,Mei Xie,Peihong Deng,Yonghui Xia,Guangli Li
In this study, we reported facile synthesis of Fe3O4/C composite and its application for the cost-effective and sensitive determination of tryptophan (Trp) in human serum samples. Fe3O4/C composites were prepared by a simple one-pot hydrothermal method followed by a mild calcination procedure, using FeCl3∙6H2O as Fe3O4precursor, and glucose as reducing agent and carbon source simultaneously. The Fe3O4/C composite modified glassy carbon electrode (Fe3O4/C/GCE) was prepared by drop-casting method. The microstructure and morphology of Fe3O4/C composite was characterized by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Due to large specific surface area and synergistic effect from Fe3O4nanoparticles and carbon coating, Fe3O4/C composite showed excellent electrocatalytic activity toward the oxidation of Trp. As a result, the proposed Fe3O4/C/GCE displayed superior analytical performances toward Trp determination, with two wide detection ranges (1.0–80 μM and 80–800 μM) and a low detection limit (0.26 μM, S/N = 3). Moreover, successful detection of Trp in human serum samples further validate the practicability of the proposed sensor.Keywords:Fe3O4/C composite;tryptophan;voltammetric detection;second derivative linear scan voltammetry
研究领域:
分析化学
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生物医学工程
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Qingwei Li,Kai Nan,Wei Wang,Hao Zheng,Kaikai He,Yan Wang
Electromagnetic (EM) pollution can disrupt the functioning of advanced electronic devices, hence it’s necessary to design EM wave absorbers with high-level absorption capabilities. The Ti 3 C 2 T x (MXene) is classified as a potential EM absorbing material; nevertheless, the lack of magnetic loss mechanism leads to its inadequate EM absorbing performance. On this basis, a novel composite design with promising EM absorption properties is hypothesized to be the integration of few-layer MXene and heterogeneous magnetic MOF derivatives (Fe 3 O 4 /C) with complementary advantages. Herein, we synthesized two-dimensional (2D) interfacial-polarization-enhanced MXene hybrid (Fe 3 O 4 /C/MXene) by electrostatic assembly. It is notable that the interfacial polarization is realized by adding a small amount of magnetic Fe 3 O 4 /C. Furthermore, the Fe 3 O 4 /C/ MXene demonstrates an astonishing effective absorption bandwidth (EAB) of 10.7 GHz and an excellent EM wave absorption performance (RL min ) of −66.9 dB. Moreover, the radar cross section (RCS) of Fe 3 O 4 /C/MXene is lower than −15.1 dB m 2 from −90° to 90° with a minimum RCS value of −52.6 dB m 2 at 32°. In addition, the significant attenuation of the EM wave is due to the synergistic effect of improved impedance matching, dielectric loss, and magnetic loss. Thus, the magnetized Fe 3 O 4 /C/MXene hybrid is expected to emerge as a strong contender for high-performance EM wave absorbers.
研究领域:
材料科学
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电磁学
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Xinjie Yun,Qifan Wu,Lei Feng,Jiancang Shen,Jian Chen,Paul K. Chu,Lizhe Liu,Xinglong Wu
Magnetic particles can be combined with carbon materials to prepare core-shell microwave absorbers and the proper core/shell weight ratio yields the optimal absorption effects. However, few studies have focused on the influence of core surface modification on the microwave absorption performance. In this work, e-Fe 3 O 4 @C composite microspheres are synthesized by surface etching of core Fe 3 O 4 microspheres in HCl followed by polymerization/carbonization. Core surface modification improves the microwave absorption capability of the e-Fe 3 O 4 @C microsphere films. The minimal reflection loss (RL min ) is −54.38 dB at 12.4 GHz for a film thickness of 2.6 mm and the maximum effective bandwidth is extended to 4.1 GHz (3 mm). Etching of the Fe 3 O 4 core surface increases the interfacial contact area consequently enhancing interface polarization and defects created by surface etching produce additional dipole polarization to further increase the dielectric loss. The underlying mechanism is investigated and described. The results reveal a novel and effective strategy to enhance the properties of core-shell microwave absorption materials.
研究领域:
材料科学
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电磁学
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纳米技术
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DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 11
·2543
·
IF 3.1
Yuan Chen,Jiatong Yang,Aoxiong He,Jian Li,Weiliang Ma,Marie-Christine Record,Pascal Boulet,Juan Wang,Jan-Michael Albina
Due to the volume expansion effect during charge and discharge processes, the application of transition metal oxide anode materials in lithium-ion batteries is limited. Composite materials and carbon coating are often considered feasible improvement methods. In this study, three types of TiO2@Fe3O4@C microspheres with a core–double-shell structure, namely TFCS (TiO2@Fe3O4@C with 0.0119 g PVP), TFCM (TiO2@Fe3O4@C with 0.0238 g PVP), and TFCL (TiO2@Fe3O4@C with 0.0476 g PVP), were prepared using PVP (polyvinylpyrrolidone) as the carbon source through homogeneous precipitation and high-temperature carbonization methods. After 500 cycles at a current density of 2 C, the specific capacities of these three microspheres are all higher than that of TiO2@Fe2O3with significantly improved cycling stability. Among them, TFCM exhibits the highest specific capacity of 328.3 mAh·g−1, which was attributed to the amorphous carbon layer effectively mitigating the capacity decay caused by the volume expansion of iron oxide during charge and discharge processes. Additionally, the carbon coating layer enhances the electrical conductivity of the TiO2@Fe3O4@C materials, thereby improving their rate performance. Within the range of 100 to 1600 mA·g−1, the capacity retention rates for TiO2@Fe2O3, TFCS, TFCM, and TFCL are 27.2%, 35.2%, 35.9%, and 36.9%, respectively. This study provides insights into the development of new lithium-ion battery anode materials based on Ti and Fe oxides with the abundance and environmental friendliness of iron, titanium, and carbon resources in TiO2@Fe3O4@C microsphere anode materials, making this strategy potentially applicable.
研究领域:
材料科学
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电化学
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能源存储
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DOI
PubMed
高影响因子
TALANTA
·
2018
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IF 4.244
Lin Hao,Weihua Liu,Chun Wang,Qiuhua Wu,Zhi Wang
Metal-organic coordination materials have received extensive attention because of their combined benefits of both inorganic and organic building blocks. In this work, the functional magnetic metal-phenolic networks with core-shell structure were prepared from phenolic ligand (tannic acid) and metal Zn 2+ via self-assembly. The magnetic metal-phenolic networks consist of magnetic Fe 3 O 4 core and metal-phenolic network shell which can act as carbon source. The Fe 3 O 4 @C nanocomposite was then synthesized by carbonizing the magnetic metal-phenolic networks. The prepared Fe 3 O 4 @C had a high surface area and nanoscale porosity. It was successfully applied as the magnetic absorbent to enrich chlorophenols from environmental water and soil samples. Good response linearity for the analytes was observed in the range of 0.1–100.0 ng mL −1 for water and 1.0–100.0 ng g −1 for soil samples, with correlation coefficient ≥ 0.9989 and ≥ 0.9924, respectively. The limits of detection calculated at a signal-to-noise ratio of 3 (S/N = 3) were in the range from 0.01 to 0.03 ng mL −1 for the water and 0.1–0.2 ng g −1 for the soil sample, respectively. The relative standard deviations were below 6.8%.
研究领域:
材料科学
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环境科学
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分析化学
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DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2016
·Vol. 92
·期 7
·1601-1612
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IF 2.738
Jiahua Lu,Qing Liu,Zhongduo Xiong,Zhijun Xu,Yingjie Cai,Qiang Wang
BACKGROUND Synthetic dyes are present in the wastewater from many industrial processes and they cause serious problems to human and aquatic life. The development of a novel and effective peroxymonosulfate (PMS) activator is proposed to eliminate dyes pollution. A new magnetic nanocomposite, Fe 3 O 4 @C/MnCo 2 O 4 , was prepared and characterized. The activity of Fe 3 O 4 @C/MnCo 2 O 4 as heterogeneous catalyst for PMS activation was evaluated by the decolorization of Acid Orange II (AO II). RESULTS With a ‘Fe 3 O 4 @C/MnCo 2 O 4 + PMS’ system, the dye solution could be nearly completely decolorized in about 25 min over a wide pH range (pH 4.1−8.1), and 98% removal could be achieved in 15 min without pH adjustment (pH = 6.38). The influence of solution pH, dosage of catalyst and PMS, reaction temperature, and PMS activation mechanism were studied. It was found that sulfate radicals were the primary species responsible for the oxidation of AO II. The catalyst was magnetically separable and displayed good stability and reusability, giving six cycles of use without deterioration in its performance. CONCLUSION This study demonstrated the simple recycling and high activity of Fe 3 O 4 @C/MnCo 2 O 4 composite in PMS activation for the decolorization of AO II solution. It provides a promising way for the decontamination of organic pollutants. © 2016 Society of Chemical Industry
研究领域:
环境科学
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化学工程
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DOI
高影响因子
TALANTA
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2020
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IF 5.339
Yaofang Fan,Yanming Liu,Qihui Zhou,Hao Du,Xueyang Zhao,Fei Ye,Huimin Zhao
Fluorescence resonance energy transfer , a promising method for in situ imaging of miRNA in living cells, has intrinsic limitation on sensitivity and selectivity . Herein, a fluorescent amplification strategy based on catalyzed hairpin assembly indirectly covalent on Fe 3 O 4 @C nanoparticles via short single-stranded DNA was investigated for cellular miRNA detection in living cells, integrating non-enzyme target-active releasing for amplifying the signal output, highly quenching efficiency of Fe 3 O 4 @C nanoparticles with low background, ssDNA assisted fluorescent group-fueled chain releasing from Fe 3 O 4 @C nanoparticles with enhanced fluorescence response. The designed platform exhibits highly sensitive in a wide linear concentration range of 0.450 pM–190 pM and is highly specific for miRNA-20a detection with the ability of discriminating one mistake base. Additionally, the CHA-Fe 3 O 4 @C was successfully applied in imaging visualization of miRNA-20a in the living cell. The strategy provides a promising bioassay approach for clinical research.
研究领域:
生物化学
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分子生物学
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纳米医学
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DOI
PubMed
高影响因子
MICROCHIMICA ACTA
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2025
·Vol. 192
·期 9
·1-16
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IF 5.3
Meng Jingjing,Han Lu,Li Lu,Yin Xue-bo,Zheng Jing
Manganese dioxide (MnO 2 )-based heterogeneous catalysts have gained significant attention in nanozyme research due to their exceptional oxidase-mimicking capabilities. This work reports the rational design of MnO 2 functionalized magnetic carbon nanotubes (Fe 3 O 4 @C@MnO 2 ) through a multistep synthesis strategy. The magnetic N-doped hollow carbon substrate (Fe 3 O 4 @C) was first synthesized via controlled pyrolysis of FeOOH-coated polydopamine precursors. Subsequent interfacial redox reaction with KMnO 4 enabled the in situ deposition of ultrathin MnO 2 nanosheets on the nanotube substrate, forming a triple-component coaxial architecture. This hollow structure not only facilitates dense MnO 2 deposition but also maintains robust magnetic responsiveness. The obtained Fe 3 O 4 @C@MnO 2 exhibits remarkable enzyme-mimetic capability, catalyzing TMB chromogenic conversion with 0.92-fold enhanced catalytic performance relative to pristine MnO 2 . Systematic mechanistic studies reveal that tannic acid (TA) competitively inhibits ·OH radical generation via MnO 2 -TA complexation, while the carbon interlayer enhances electron transfer efficiency. Owing to the superior enzyme-mimetic performance of Fe 3 O 4 @C@MnO 2 and their inhibition effect by TA, a sensitive colorimetric biosensing assay was fabricated, achieving a TA detection limit of 0.029 μM with a 0.096–4.82 μM linear concentration range. This work exemplifies the synergy of structural engineering and component optimization in designing multifunctional nanozymes, showing potential applications in food quality monitoring, environmental analysis, and point-of-care diagnostics. Graphical
研究领域:
纳米酶技术
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纳米材料合成
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生物传感器
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环境分析
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食品安全监测
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
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2023
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IF 8.3
Wenjun Zhu,Xiaohua Zuo,Xiaofei Zhang,Xiangyi Deng,Deng Ding,Chunlei Wang,JunTao Yan,Xiaobo Wang,Guanghui Wang
A novel CuO–Fe 3 O 4 encapsulated in the carbon framework with abundant oxygen vacancies (CuO–Fe 3 O 4 @C) was successfully prepared by thermal conversion of Cu(OAc) 2 /Fe-metal organic framework. The as-prepared catalyst exhibited excellent peroxymonosulfate (PMS) activation performance, good recyclability and fast magnetic separation. Under optimal conditions, the added BPA (60 mg/L) could be completely removed by CuO–Fe 3 O 4 @C/PMS system within 15 min with the degradation rate constant ( k ) of 0.32 min −1 , being 10.3 and 246.2 times that in CuO/PMS (0.031min −1 ) and Fe 3 O 4 /PMS (0.0013 min −1 ) system. A deep mineralization rate of BPA (＞80%) was achieved within 60 min. The results demonstrated the synergistic effect of bimetallic clusters, oxygen vacancies and carbon framework was a key benefit for the exposure of more active sites, the electron donor capacity and the mass transfer of substrates, thereby promoting the decomposition of BPA. Capture experiments and EPR indicated that 1 O 2 was the predominant reactive oxygen species (ROSs). The degradation routes of BPA and the activation mechanism of PMS were proposed. This study offers an opportunity to develop promising MOFs-derived hybrid catalysts with tailored structures and properties for the practical application of SR-AOPs.
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
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
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2014
·Vol. 2014
·期 20
·3172-3177
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IF 2.965
Zhiming Chen,Zhirong Geng,Zhiyang Zhang,Lianbing Ren,Tingxian Tao,Renchun Yang,Zuxiang Guo
Graphical Core–shell magnetic Fe 3 O 4 @C nanoparticles are functionalized with sulfonic and carboxylic acid groups and employed to capture heavy metal ions in aqueous media. The magnetic Fe 3 O 4 @C nanoparticles can be easily separated with an external magnet and possess rapid removal kinetics, high adsorption capacities, and removal efficiencies for Pb 2+ , Hg 2+ , and Cd 2+ ions from aqueous solution. Core–shell magnetic Fe 3 O 4 @C nanoparticles functionalized with sulfonic and carboxylic acid groups were synthesized and employed to capture heavy metal ions in aqueous media. The Fe 3 O 4 cores possess unique magnetic properties for adsorbent separation, and the –SO 3 H and –COOH groups attached to the surface of the carbon shells determine the efficiency of heavy metal ion removal. Batch adsorption experiments showed that Pb 2+ , Hg 2+ , and Cd 2+ ions can be completely and quickly removed by the Fe 3 O 4 @C nanoparticles. The equilibrium was established within 5 min, and the maximum adsorption capacities of the Fe 3 O 4 @C nanoparticles toward Pb 2+ , Hg 2+ , and Cd 2+ ions were 90.7, 83.1, and 39.7 mg/g, respectively. The removal efficiencies were 96.3, 98.1, and 93.8 % for Pb 2+ , Hg 2+ , and Cd 2+ ions, respectively. This work provides a facile and general approach to synthesize magnetic functional nanocomposites for wastewater treatment.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 10
·4014-4021
·
IF 3.269
Fuchong Li,Yansheng Liu,Tianqiong Ma,Dianhong Xu,Xu Li,Guangbi Gong
Palladium nanoparticles (NPs) were applied for the hydrodechlorination of chlorophenols in contaminated water using H2 as a clean and sustainable reductant. In this study, a high-efficiency Pd-based catalyst (Pd/Fe3O4@C) was facilely synthesized and applied for the reduction of 4-nitrophenol and hydrodechlorination of 4-chlorophenol in an aqueous solution. Compared with most Pd-based catalysts, the Pd/Fe3O4@C nanocatalyst exhibits a higher catalytic performance. The well-dispersed Pd NPs were modified on the spherical carbon surface through coordination chemical bond. The superparamagnetic character of the Fe3O4 core enabled the Pd/Fe3O4@C nanocatalyst to be very easily separated and recovered from the reaction mixture. Thus, the nanocatalyst can be repeatedly used without significant weight loss. The high catalytic activity of the Pd/Fe3O4@C nanocatalyst indicates that noble metal nanoparticles supported on magnetic carbon sphere materials could act as promising catalysts and have potential applications in numerous Pd-based catalytic reactions.
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）