Materials Research Express
·
2018
·Vol. 5
·期 5
·056305
·
IF 1.151
Xiaogang Su,Jun Wang,Bin Zhang,Wei Chen,Qilei Wu,Wei Dai,Yi Zou
Recently, owing to the radiation and interference from electromagnetic wave (EMW), the requirements of EMW absorbing materials have been increasing. Herein, a novel absorber composed of graphite nanosheets@Fe3O4 composites decorated comb-like MnO2 (GNFM) has been successfully synthesized via a facile two steps, characterized using x-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), x-ray photoelectron spectroscopy (XPS), Raman spectroscopy, vibrating sample magnetometry (VSM) and vector network analyzer (VNA). The ternary composites with enhanced microwave absorption performance are due to the complementary effects of electroconductive material (graphite nanosheets), dielectric materials (MnO2) and magnetic material (Fe3O4 nanospheres). Hence, the maximum reflection loss of GNFM/epoxy composites is up to −31.7 dB at 5.85 GHz with absorbing thickness of 4.5 mm, and the efficient frequency bandwidth below −10 dB can reach up to 4.47 GHz (11.87–16.34 GHz) at matching thickness of 2 mm. The results demonstrate that GNFM could be regarded as a novel type of microwave absorbing material.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2020
·Vol. 96
·期 3
·639-649
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IF 2.75
Shanshan Jiang,Jin Huang,Yue Wang,Shiyu Lu,Pei Li,Cuiqin Li,Feng Li
Abstact BACKGROUND Fe based metal organic frameworks (Fe-MOFs) were prepared by solvothermal method, and carbon loaded Fe 3 O 4 (Fe 3 O 4 /C) was prepared by pyrolytic carbonization and carbothermal reduction. RESULTS Various analytical techniques were used to characterize the physicochemical structure of Fe-MOFs and Fe 3 O 4 /C under different solvothermal and calcination conditions. Fe 3 O 4 /C was then employed as a catalyst for the catalytic transfer hydrogenation of furfural with alcohol as a hydrogen donor, and the effect of hydrogen donor species, reaction temperature, and reaction time were investigated. CONCLUSION The Fe 3 O 4 /C catalyst could be easily collected with a magnet and reused for four runs without significant loss of its catalytic. A possible mechanism for the catalytic transfer hydrogenation of furfural over Fe 3 O 4 /C was proposed. © 2020 Society of Chemical Industry (SCI)
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MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Li Zhao,Wei Lv,Juying Hou,Yijing Li,Junling Duan,Shiyun Ai
We synthesized magnetically recyclable g-C 3 N 4 /Fe 3 O 4 /ZIF-8 nanocomposites as an emerging adsorbent for the malachite green (MG) removal in aqueous solution. Bath absorption experiments for MG were done to explore the influence (pH, adsorbent dosage and initial concentration) on its absorption process. The adsorption isotherm and kinetics followed Langmuir model and pseudo-second-order kinetic model, respectively. The thermodynamic datas (ΔG ○ < 0, ΔH ○ > 0, ΔS ○ > 0) showed that the adsorption process for MG was feasible, endothermic and spontaneous. The g-C 3 N 4 /Fe 3 O 4 /ZIF-8 nanocomposites showed excellent removal properties for MG. The maximum equilibrium adsorption capacity could reach as high as 3412 mg/g. The g-C 3 N 4 /Fe 3 O 4 /ZIF-8 nanocomposites could be easily separated using an external magnet, and the nanocomposites could be repeatedly utilized after five cycles. The ultra-high adsorption capacity, easy separation, and excellent recyclability enabled the obtained g-C 3 N 4 /Fe 3 O 4 /ZIF-8 nanocomposites a good adsorbent for the adsorption of MG.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Xiang Li,Lunzhou Yu,Zhen Xiang,Erbiao Cui,Juan Xiong,Xiao Wang,Wei Lu
Core-shell structure is an effective approach to modulate the impedance matching behaviour and induce polarization relaxation at the interface for the high-performance electromagnetic wave absorption (EMWA) materials. Herein, core-shell structures of Fe 3 O 4 –Fe@C (FFC) were successfully developed by hydrothermal and thermal decomposition methods. The results showed that the phase composition, microstructure and EMWA performance were tailored by the heat treatment process. The optimized FFC hybrid exhibited a minimum reflection loss ( RL ) value of −56.3 dB with a matching thickness of 1.99 mm, and the effective bandwidth ( RL < −10 dB, 5 GHz) covers almost the whole Ku band. The enhanced EMWA properties of the reinforced olive-like composites were mainly ascribed to the magnetic loss derived from the enhanced magnetic anisotropy, and the dielectric loss originated from the multilevel interface and polarization characteristics between the core and the shell. Therefore, this work provides an approach to design core-shell nanocomposites with enhanced EMWA performance.
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RSC Advances
·
2020
·Vol. 10
·期 17
·10309-10314
·
IF 3.119
Tianwen Mi,Yuxuan Cai,Qing Wang,Nuzahat Habibul,Xiaoli Ma,Zhi Su,Wei Wu
Eco-friendliness and low cost are critical when investigating new oil–water separation agents with high separation efficiencies for the treatment of emulsified oily wastewater in industrial applications, including crude oil exploitation. Treatment methods specifically suited to wastewater containing ultra-small oil droplets are lacking and urgently required. This study investigated the one-pot synthesis of humic acid and polydimethyldiallylammonium chloride coated Fe3O4 nanoparticles. A low dosage of the nanoparticles (375 μg mL−1) exhibited excellent separation efficiency (nearly 100%) and reusability when applied to hexadecane–water emulsions containing ultra-small droplets (200–300 nm). Electrostatic interactions and the strong interfacial activity of the nanoparticles played essential roles in achieving oil–water separation. This study provided an efficient extraction material synthesized by a facile and cheap method for separating ultra-small oil droplets from emulsions.
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Batteries & Supercaps
·
2022
·Vol. 5
·期 5
·e202200020
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IF 6.043
Wence Yue,Xue Li,Jie Zhao,Yibo Gao,Ning Gao,Bao Li,Guangming Xia,Shumin Zheng,Bao Wang
Graphical Dual-function separator for LiS batteries : We decorated carbon nanotubes with ferromagnetic Fe 3 O 4 nanoparticles and then coated the composite (Fe 3 O 4 @CNTs) on a commercial separator. Carbon nanotubes can provide a network for electron transport, and ferromagnetic Fe 3 O 4 nanoparticles can serve as polysulfide trapping centers to anchor polysulfides. The cell with FC-6/PP can provide a high initial discharge capacity of 585 mAh g −1 after activation and a reversible specific capacity of 468 mAh g −1 after 700 cycles at 5 C. As a promising energy storage system with high specific capacity, lithium-sulfur (Li−S) battery is striving for a high-rate and longer lifetime. Whereas the slow redox kinetics and the shuttle effect of polysulfides (PSs) still severely restrict the performance of Li−S batteries. Here, a rational designed ferromagnetic Fe 3 O 4 nanoparticles (FM-Fe 3 O 4 NPs) modified separator is engineered for Li−S batteries. Moreover, the particle size of FM-Fe 3 O 4 NPs was tuned to enhance the energy storage performance. Consequently, the cells with FM-Fe 3 O 4 NPs modified separator achieved a high-rate and long cycling performance, the specific capacity could reach 672.8 mAh g −1 and a low fading rate (0.028 % per cycle over 700 cycles) at a high rate of 5 C. Experimental results reveals that FM-Fe 3 O 4 NPs could mitigate shuttle effect, enable efficient redox reactions, and protect the Li anode from severe corrosion. The performance-enhanced mechanism is further discovered by DFT calculations, the results show that FM-Fe 3 O 4 NPs act as mediators of redox reaction to block PSs shuttle and dynamically facilitate conversion via changing the molecular structure of PSs and reducing reaction barrier. This work provides a new pathway to improving Li−S batteries based on ferromagnetic materials, which may be generalized to other advanced batteries.
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Journal of the Taiwan Institute of Chemical Engineers
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2019
·
IF 3.834
Pijun Duan,Ruidian Su,Xing Xu,Qian Li,Baoyu Gao
In this paper, a novel preparation method was applied to fabricate 3D porous Cu 2 O-Fe 3 O 4 @carbon nanocomposites (Cu 2 O-Fe 3 O 4 @CN) using natural polymer hydrogel. The polymer hydrogel was used as template to immobilize cupric ions and ferrous ions first, it was then followed by a series of preparing processes including sedimentation, desiccation and calcination. Characterization analysis including TEM, EDS, XPS, XRD and VSM were employed to characterize the morphologies and structures of Cu 2 O-Fe 3 O 4 @CN . The photocatalytic performance of Cu 2 O-Fe 3 O 4 @CN for organic contaminant degradation under visible light irradiation was also evaluated. The effect of different preparation conditions on the morphology structure and photocatalytic performance of Cu 2 O-Fe 3 O 4 @CN was investigated and the optimal parameters were determined. After four repetitive use, the degradation efficiency only decreased from 95.1% to 90.1%, which suggested the great potential of Cu 2 O-Fe 3 O 4 @CN in industrialization and commercialization. Cu 2 O; Fe 3 O 4 ; Nano materials; Sodium alginate; Photocatalysis; Synergistic effect
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CHEMICAL ENGINEERING JOURNAL
·
2011
·
IF 3.074
Jianming Pan,Longcheng Xu,Jiangdong Dai,Xiuxiu Li,Hui Hang,Pengwei Huo,Chunxiang Li,Yongsheng Yan
Via encapsulation of attapulgite/Fe 3 O 4 magnetic particles (ATP/Fe 3 O 4 ), the magnetic molecularly imprinted polymers (MMIPs) were synthesized for the selective recognition of 2,4-dichlorophenol (2,4-DCP). MMIPs were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) analysis, thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), transmission electron microscopy (TEM), nitrogen adsorption–desorption analysis and Raman spectroscopy. MMIPs were demonstrated claviform shape with an imprinted polymer film (thickness of about 16 nm), and exhibited magnetic property ( M s = 5.67 emu g −1 ) and thermal stability. Batch mode adsorption studies were carried out to investigate the specific binding capacity, binding kinetics and recognition specificity. The Langmuir isotherm model was fitted to the equilibrium data better than the other models, and the monolayer adsorption capacity of MMIPs were 145.79 mg g −1 at 298 K. The kinetic properties of MMIPs were well described by the pseudo-second-order equation, initial adsorption rate and half-adsorption time. The selective recognition experiments demonstrated high affinity and selectivity towards 2,4-DCP over structurally related phenolic compounds. In addition, MMIPs could be regenerated, and their adsorption capacity in the fifth use was about 7.53% loss in 2,4-DCP solution. The MMIPs as-prepared were successfully applied to the separation of 2,4-DCP from environmental water samples.
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CHEMOSPHERE
·
2019
·
IF 5.108
Limin Hu,Peng Wang,Guoshuai Liu,Qingzhu Zheng,Guangshan Zhang
In this study, Fe 3 O 4 and microwave (MW) were combined to activate persulfate (PS) for the removal of organic matter, resulting in the enhanced degradation of p -nitrophenol (PNP) in solution. During the preparation of Fe 3 O 4 , the effect of sodium acetate was examined, and the results showed that the concentration of sodium acetate had little effect on the catalytic activity of the Fe 3 O 4 /PS/MW system but did have an effect on the Fe 3 O 4 yield. In addition, with regards to the representative environmental factors, the degradation experiment showed that humic acid and the co-existing anions of chloride, sulfate, nitrate, and phosphate had little effects on p -nitrophenol removal; however, carbonate had a negative effect. In addition, the Fe 3 O 4 /PS/MW system performed well in the initial pH range of 3.0–9.0. According to the quenching experiment and electron paramagnetic resonance (EPR) detection, sulfate radicals and a minority of hydroxyl radicals play dominant roles in the degradation process. In addition, the role of Fe 3 O 4 was confirmed to take part in the degradation process by X-ray photoelectron spectroscopy (XPS) analysis. Because of the good performance observed in the water matrices of tap water and the Songhua River, these results demonstrate the potential application of the Fe 3 O 4 /PS/MW system for wastewater treatment .
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Xuhui Wang,Jianying Wang,Zihe Chen,Kai Yang,Zexian Zhang,Zhuoxun Shi,Tao Mei,Jingwen Qian,Jinhua Li,Xianbao Wang
Herein, yolk-double shell Fe 3 O 4 @C@C nanospheres (YDS-FCCNs) were designed and synthesized via solvothermal and following heat management. The as-obtained yolk-shell morphology consisted by two parts: one for the Fe 3 O 4 @C nanosphere (diameter about 100 nm) as core, and the other for nitrogen-doped carbon (thickness about 50 nm) as the shell. The YDS-FCCNs composite exhibited preeminent cycling stability of 780 mAh/g at 0.5 A/g after 500 cycles, even at higher current density of 2 A/g, it still retained a reversible capacity of 559 mAh/g after 500 cycle. The good electrochemical performance could attribute to the following factors: First, the hierarchical double carbon shell could prevent the agglomeration of the Fe 3 O 4 , meanwhile largely enhance the electrical conductivity . Second, the synergistic effects for multilayered structure and atomic doping could improve the comprehensive electrochemical performance.
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NANO
·
2024
·
IF 1
Ying Zhou,Jinai Bian,Min Tian,Tingting Wang,Guomei Zhang,Yan Zhang,Caihong Zhang
Chronic ingestion of food containing clenbuterol (CLB) in the human body can cause acute poisoning. Thus, it is essential to develop a sensitive CLB detection way. Here, a novel electrochemical aptamer sensor based on aptamer/gold nanoparticles/amino magnetic ferric oxide/graphene nanosheets (aptamer/Au NPs/Fe 3 O 4 –NH 2 /GN) nanocomposite has been developed. The Fe 3 O 4 –NH 2 nanoparticles were self-assembled on GN, and then Fe 3 O 4 –NH 2 /GN nanocomposite was coated on the glassy carbon electrode (GCE) surface. Afterward, Au NPs were electrodeposited on Fe 3 O 4 –NH 2 /GN nanocomposite to fix the aptamer by the Au–S bonds. When CLB was added to the solution, the aptamer will specifically recognize CLB, causing current changes. Under the optimized conditions, the sensor shows better electrochemical performance (linear range is 1 × 1 0 − 1 3 M to 1 × 1 0 − 7 M, the detection limit is 1 . 1 6 × 1 0 − 1 4 M ( S / N = 3 )). It has been successfully applied to the detection of CLB in actual samples. The results show that the aptamer sensor has good selectivity, stability and repeatability, which will provide a novel idea for more sensitive and quicker CLB detection.
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MATERIALS LETTERS
·
2016
·
IF 2.437
Kaiqiang Zhou,Yichao Zhen,Zhensheng Hong,Juhua Guo,Zhigao Huang
Hierarchical Fe 3 O 4 hollow nanostructures are synthesized from the phase transition of Fe 2 O 3 hollow nanostructures, which are prepared through a dissolution-recrystallization process. The hierarchical Fe 3 O 4 hollow nanostructures, applied as an anode material for Na-ion batteries, display good rate capability and cycling stability. The reversible capacity of 150 mAh/g at 100 mA/g after 50 cycles can be maintained for Fe 3 O 4 anode. The superior Na-ion storage properties of hierarchical Fe 3 O 4 could be largely ascribed to the stable electrode structure during Na-ion insertion and extraction process. On the contrary, Fe 2 O 3 anode exhibits a high initial discharge capacity (686 mAh/g), but it suffers from poor cycling stability due to the remarkable pulverization of the electrode.
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危险品化学品经营许可证（带存储）