APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Jie-Ping Fan,Bing Zheng,Yu Qin,Dan Yang,Dan-Dan Liao,Xiao-Kang Xu,Xue-Hong Zhang,Jian-Hang Zhu
In this work, a superparamagnetic Fe 3 O 4 -graphene oxide (MGO) nanocomposite was prepared by one-step chemical co-precipitation method, and characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM), powder X-ray diffraction (PXRD), Raman spectroscopy and nitrogen adsorption–desorption curve. The as-prepared MGO was used to adsorb nuciferine, and the adsorption kinetic, isotherm and reusability of MGO were also investigated. The results showed that the adsorption of nuciferine on MGO reached its equilibrium very quickly (within 10 min) due to the two-dimensional carbon nanostructure of GO. In comparison with MGO, five conventional sorbents, i.e., macroporous resin D-101, silica gel, reverse phase silica gel (RP-C18) and cation exchange resin and polyamide, were also used to evaluate their adsorption capabilities. Therefore, MGO combined the advantages of both superparamagnetic particle and GO, i.e., easy separation and high absorption capacity. Finally, MGO was successfully applied to enrichment and separation of nuciferine in the extract of Nelumbinis Folium (Lotus leaf).
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 91
·74575-74584
·
IF 3.84
Zhenzhen Wang,Shangru Zhai,Jialing Lv,Haixin Qi,Wei Zheng,Bin Zhai,Qingda An
A novel monodispersed hierarchical nanocomposite catalyst of Cu/Fe3O4 was successfully synthesized through a short-time (just 4 h), facile, eco-friendly one-pot hydrothermal method. The as-prepared Cu/Fe3O4 nanocomposite was well characterized and the results showed that the products were spherical in morphology with diameters of about 100 nm. The BET surface area of the nanospheres was 37.16 m2 g−1, indicating that the product showed a porous character, and the major BJH pore size was 3.73 nm. The saturated magnetization of the Cu/Fe3O4 nanospheres was 48.0 emu g−1, which facilitated their separation and recovery with the aid of an external magnet. In addition, the influences of experimental parameters such as the dosage of trisodium citrate dehydrate (Na3Cit) and urea as well as reaction duration time were investigated in detail to fully elucidate the formation mechanism. More charmingly, the Cu/Fe3O4 nanocomposites exhibited excellent catalytic activity towards the reduction of hazardous organic dyes (4-nitrophenol, 4-NP; congo red, CR; methylene blue, MB) in aqueous media in the presence of NaBH4 with very fast kinetics and good stability. The relationship between the Cu precursor addition amount and catalytic ability was also established. Considering the simplicity of the operation procedure, short time, low cost as well as easy recycling of the catalyst, this preparation protocol may shed light on the fabrication of other metal oxide materials; and hopefully, this hierarchical nanocomposite may find potential applications in other domains like heavy metal removal or antibacterial applications.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 8
·3487-3492
·
IF 3.288
Guopeng Chen,Guofeng Zhang,Fuchao Yang
Stimuli-responsive materials with appealing interactions can serve as key modules for smart devices and have a broad scope of application. In this study, Fe3O4@PDA@TiO2 microspheres with a core–shell structure were assembled. The hollow microspheres have a mesoporous structure and were characterized by SEM, TEM, XRD, Raman, BET, XPS, UV-vis and TGA analyses. Then, a photoresponsive coating with reversibly switchable wettability was prepared by a simple sieve-deposition method using Fe3O4@PDA@TiO2 powder. In addition, the Fe3O4@PDA@TiO2 coated fiber textile was obtained by a dipping method and was used for oil–water separation due to its underwater superoleophobicity. Finally, it was found that this material with its hollow and mesoporous structure can be used for dye adsorption, while the anatase TiO2 ingredient shows good photocatalysis performance.
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高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 7
·4179-4189
·
IF 5.044
Zhang Shaobo,Zhou Yuhang,Zhu Gaolu,Jiang Yongze,Xie Jiulong,Qi Jinqiu,Yang Hanbo,Hui Wenkai,Huang Jintian
Abstract The magnetic properties of the magnetic transparent composite films largely depend on the content of Fe 3 O 4 employed. However, higher addition of Fe 3 O 4 into the matrix will lead to Fe 3 O 4 nanoparticles agglomeration resulting in the reduction in the transparency of the composite films. The contradiction between Fe 3 O 4 nanoparticle content and transparency limits the application of transparent magnetic films. In this work, the spherical bamboo nanocellulose (SBN) with an average size of 61 nm was prepared from bamboo powder by NaOH/Urea/Thiourea aqueous system, which was an effective, inexpensive and less toxic strategy. The basic structure of SBN was investigated. The SBN exhibited the cellulose II type crystal structure. The molecular chain length of SBN were lower than before dissolution. The magnetic SBN/Fe 3 O 4 composite films with light penetration were prepared. The results revealed that the dispersion of Fe 3 O 4 nanoparticles in the SBN/Fe 3 O 4 composite films was much better than that in nanofibrillated cellulose (NFC)/Fe 3 O 4 composite films because of the abundant hydrogen bonds between Fe 3 O 4 nanoparticles and SBN. The transparent results indicated the highest transmittance of the films was 94% in the wavelength range of visible light, which was almost 23.7% higher than that of NFC/Fe 3 O 4 composite films with the same amount of Fe 3 O 4 addition (15 wt%). The findings in this study also revealed that the SBN in the SBN/Fe 3 O 4 composite films was distributed in layers. The saturation magnetization of the SBN/Fe 3 O 4 composite films was 10.65 emu g −1 with 15 wt% Fe 3 O 4 incorporated, which guaranteed the excellent magnetic properties. Graphic abstract
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2013
·
IF 4.612
Xiangfeng Chen,Ning Ding,Hao Zang,Hoisze Yeung,Ru-Song Zhao,Chuange Cheng,Jianhua Liu,T.-W. Dominic Chan
Fe 3 O 4 @MIL-100 core–shell magnetic microspheres were, for the first time, used as the sorbent for the magnetic solid-phase extraction (MSPE) of polychlorinated biphenyls at trace levels in environmental water samples. GC coupled with tandem MS was used for sample quantification and detection. The Box–Behnken design was used to determine the optimum extraction parameters influencing extraction efficiency through response surface methodology. Under the optimized conditions, the developed method showed good linearity within the range of 5–4000 ng L −1 , low limits of detection (1.07–1.57 ng L −1 ; signal-to-noise ratio = 3:1), and good extraction repeatability (relative standard deviation < 12%; n = 5). Environmental samples collected from the Yellow River, local lake, wastewater, and snow water were processed using the developed method. The results demonstrated that the Fe 3 O 4 @MOF core–shell magnetic microspheres are promising sorbents in the MSPE of aromatic pollutants from environmental water samples.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2016
·
IF 2.74
Ying Zhang,Lizhen Bai,Wenfeng Zhou,Runhua Lu,Haixiang Gao,Sanbing Zhang
Fe 3 O 4 @nSiO 2 @mSiO 2 was prepared successfully and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), infrared spectrometer (FT-IR), BET surface area measurements and Zeta potential analysis techniques. The contact time, initial concentration of congo red, temperature and pH on adsorption capacity were studied. The adsorbent shows highly efficient adsorption properties, with maximum adsorption capacity of 1428 mg g − 1 for congo red, which is much higher than the other adsorbents (normally below 300 mg g − 1 ). The adsorption kinetics and isotherm of congo red on Fe 3 O 4 @nSiO 2 @mSiO 2 were systematically investigated and found that the adsorption kinetics and isotherm were well fitted by pseudo-second-order kinetic and Langmuir isotherm model.
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Tingting Jiang,Sihui Bian,Siyu Huang,Guanbo Wang,Xinyue Song,Lin Zhu
Access to safe and cost-effective water is essential for sustainable development. Microbial water pollution has become an issue of increasing global concern. However, conventional water disinfection methods are beset with numerous limitations and challenges, particularly the generation of harmful carcinogenic by-products associated with chlorine-based technologies. Hence, we reported α-MoC 1-x @CB-Fe 3 O 4 -6 (denoted as α-MCF-6) composite for effective water sterilization based on photothermal effect. The composite showed superior light absorption and photothermal property, enabling temperature elevation of α-MCF-6 dispersion (50 μg/mL) from ambient to 61.7 °C. The α-MCF-6 dispersion achieved 100 % inactivation of both E. coli and S. aureus after 10 min NIR irradiation (2 W/cm²), and more than 98 % sterilization efficiency over three reuse cycles. COMSOL Multiphysics® v. 6.3 simulations illustrated efficient photothermal heat transfer from irradiated nanomaterials to aqueous media, causing bulk heating. Gram staining confirmed close contact between bacteria and α-MCF-6, facilitating heat transfer from the material to bacteria. Additionally, EPR analysis verified the presence of hydroxyl radicals (•OH and O 2 •− ), which contributed to assisted effects. This work explored an application of molybdenum-based photothermal materials and provided a high performance and energy-saving water sterilization method. COMSOL Multiphysics® v. 6.3 simulations and Gram staining confirmed close contact and heat transfer from the material to bacteria.
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Xudong Hu,Jingyi Shang,Xiaolian Zhao,Jun Long,Izaz ul Islam,Shuang Li,Usman Farooq,Xinhai Wang
Fe 3 O 4 @CoFe-LDH, a magnetic composite, and its counterpart, CoFe-LDH, were successfully synthesized via a co-precipitation method and systematically investigated for their performance and mechanism in activating peroxymonosulfate (PMS) for tetracycline (TC) degradation. Fe 3 O 4 @CoFe-LDH possessed a typical LDH structure with Fe 3 O 4 nanoparticles uniformly dispersed in the CoFe-LDH matrix, forming a heterojunction interface that effectively combined the magnetism of Fe 3 O 4 and the high catalytic activity of CoFe-LDH. Magnetic analysis (VSM) indicated a saturation magnetization of 23.93 emu/g for the composite, enabling magnetic separation and recovery within 30 s, significantly enhancing the practical applicability. Under optimal conditions (0.07 g/L catalyst, 0.75 mM PMS, pH 6–8, 25 °C), Fe 3 O 4 @CoFe-LDH/PMS achieved 97.6 % TC (25 mg/L) degradation, outperforming CoFe-LDH (93.9 %). Radical quenching and ESR revealed sulfate radicals (SO 4 •- ) and nonradical ( 1 O 2 ) as dominant species, with Fe 2+ /Fe 3+ –Co 2+ synergism promoting 1 O 2 pathways. Density functional theory (DFT) calculations showed enhanced charge transfer and reduced activation energy at the heterojunction. After four cycles, Fe 3 O 4 @CoFe-LDH retained 82.3 % activity (vs. 73.2 % for CoFe-LDH) and exhibited strong anti-interference (86.8–92.4 % TC removal in natural water), highlighting its engineering potential.
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产品关联
DOI
高影响因子
IONICS
·
2025
·
IF 2.6
Li Chunxiang,Xia Sushuang,Qian Xinmei,Zheng Mingyu,Deng Keqin
Electrocatalyst with high accumulation capacity and efficient electrocatalysis are crucial for constructing electrochemical sensors. In this study, 3D hierarchical nitrogen-doped carbon nanosheets decorated by Fe 3 O 4 /CoFe nanoparticles (Fe 3 O 4 /CoFe@N-CSs) were successfully prepared. The morphology, composition, microstructure, and property were investigated by SEM, HRTEM, XRD, XPS, and cyclic voltammetry. The synthesized Fe 3 O 4 /CoFe@N-CSs were assembled by two-dimensional (2D) nanosheets to form flower-like layered structure. It displayed a large amount of pore space for promoting the accumulation of targets and brilliant electrocatalysis towards the electrochemical oxidation of sunset yellow (SY) and tartrazine (TTZ). Using Fe 3 O 4 /CoFe@N-CSs to modify screen-printed electrode (SPE), a disposable electrochemical sensor (Fe 3 O 4 /CoFe@N-CSs/SPE) was constructed for the analysis of SY and TTZ. It showed the detection range of 0.008–5.0 μM and 0.02–10.0 μM with the detection limit of 2.0 nM and 4.0 nM, respectively. The practical applicability of the sensor in real drink samples provided satisfactory data. The results indicated that Fe 3 O 4 /CoFe@N-CSs was a promising nanomaterial, contributing great potential for individual and synchronous measurement of trace amounts of SY and TTZ in food samples.
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产品关联
DOI
高影响因子
Journal of Hazardous Materials Advances
·
2021
·
IF 0
Xiao-Yu Zhang,Jing-Jing Wang,Ping Li,Yu-Jia Xiao,Zhao-Yi Tan,Yan-Rong He,Nuzahat Habibul
Herein, Fe 3 O 4 /g-C 3 N 4 composites with different proportions were prepared to remove U(VI) from wastewater through photocatalytic reduction. The morphology, composites, and magnetism of the Fe 3 O 4 /g-C 3 N 4 composites were measured. The characterization results showed that Fe 3 O 4 nanoparticles were well distributed on the surface of g-C 3 N 4 , resulting in the good magnetism and corresponding excellent separation ability of the composites. The U(VI) removal efficiency of the composites with different ratios of Fe 3 O 4 and g-C 3 N 4 was also determined. It was found that Fe 3 O 4 /g-C 3 N 4 with an Fe content of 14% showed the highest U(VI) removal efficiency of 98.7% after 25 min. The photocatalytic reaction rate constant was 0.161 min −1 , which was 2.9 times that of pure g-C 3 N 4 and 2.4 times that of pure Fe 3 O 4 . In addition, after five reaction cycles, the composite showed high photoreduction activity and magnetic properties.
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MATERIALS LETTERS
·
2019
·
IF 3.019
Baoe Li,Zhenghao Sun,Yan Zhao,Zisheng Zhang
Lithium-sulfur batteries were considered as a new generation of high energy density batteries, but their commercialization was limited by volume expansion, the low conductivity of sulfur and shuttle effect. To overcome these issues, we developed a three-dimensional carbon nanotube/Fe 3 O 4 microspheres via spray drying and calcination as sulfur host materials (S/CNT/Fe 3 O 4 ). In this three-dimensional microsphere structure, interwoven CNT backbone offers a robust conductive network with sufficient space for loading sulfur, and the polar Fe 3 O 4 nanoparticles can enhance chemical adsorption of polysulfide. Benefiting from these advantages, the S/CNT/Fe 3 O 4 cathode exhibit high initial discharge capacity (1270 mAh g −1 at 0.2 C), superior rate performance (602 mAh g −1 at 3 C), and long cyclic stability (only 0.084% capacity decay per cycle for 300 cycles at 1 C).
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Liu-Yang Sun,Lie Yang,Jing Li,R. Lakshmi Narayan,Xiao-Hui Ning
Iron oxide , a promising anode material for lithium ion batteries, has a high theoretical specific capacity but exhibits poor cycling performance and rate capability. To resolve these issues, 150 nm sized carbon coated, hollow Fe 3 O 4 nanoellipsoids are designed in this study. Owing to the relatively high utilization ratio of Fe 3 O 4 and the buffer provided by the carbon layer, this composite has enhanced lithium ion storage properties and long cycle life. From half-cell measurements, the capacity is found to be in excess of 400 mAh g −1 even after 1000 cycles at 5 A g −1 . And then, a facile and practical strategy is used to gain a relatively high compressed density (∼1.87 g cm −3 ), so the volumetric capacity of the Fe 3 O 4 @C electrode can be further enhanced by subjecting it to compression. In the full cell test, the Fe 3 O 4 @C electrode has a specific capacity of 400 mAh g −1 and volumetric capacity of 749 mAh cm −3 after 100 cycles. The improvement in cycling stability can be attributed to minimal volume expansion and the stability of the solid-electrolyte interphase (SEI) layer, over the nanoparticles . Finally, the evolution of solid-electrolyte interphase layer is indirectly monitored and the progressive loss of active lithium is quantitatively measured.
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高影响因子
危险品化学品经营许可证（带存储）