JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2019
·
IF 2.683
Weikang Liu,Bin Cheng,Tingting Miao,Jihao Xie,Liang Liu,Jinru Si,Guangjun Zhou,Hongwei Qin,Jifan Hu
The raw nano α-Fe 2 O 3 powders consisting of nanorods with 50–100 nm in length and 8–14 nm in width exhibit superparamagnetism. The vacuum annealing of the raw nano α-Fe 2 O 3 at 400 °C for 3 h leads to ferromagnetic-like behaviors at room temperature (RT), due to the appearance of ferrimagnetic Fe 3 O 4 . The α-Fe 2 O 3 /Fe 3 O 4 composite structure has an antiferromagnetic α-Fe 2 O 3 layer and a ferrimagnetic Fe 3 O 4 layer contains a certain amount of Fe 2+ and oxygen vacancies. In addition, nano α-Fe 2 O 3 annealed in H 2 at 300 °C for 3 h completely become Fe 3 O 4 . Some magnetic properties of the α-Fe 2 O 3 /Fe 3 O 4 , such as magnetization, magnetic remanence (Mr), coercivity (Hc) and exchange bias (EB), can be modulated almost reversibly and non-volatilely by applied external RT electric field without loop current. However, for both the raw nano α-Fe 2 O 3 and the Fe 3 O 4 , these magnetic properties cannot be modulated by applied external RT electric field. The electric field control of magnetic properties for the α-Fe 2 O 3 /Fe 3 O 4 should be due to the mechanism of phase transition induced by migration and redistribution of oxygen vacancies within the interface of α-Fe 2 O 3 /Fe 3 O 4 .
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2017
·Vol. 77
·期 3
·628-637
·
IF 1.197
Guo Shuangzhen,Zhang Jian,Li Xianlong,Zhang Fan,Zhu Xixi
A novel core-shell bio-adsorbent was fabricated by using biological materials for removing methyl orange (MO) from aqueous solution. The structure characteristics results of scanning electron microscopy (SEM), Fourier transform infrared spectrometry (FT-IR), thermo-gravimetric analysis (TGA), vibrating sample magnetometer (VSM), and Brunauer–Emmett–Teller (BET) shows that Fe 3 O 4 -CS-L has been successfully prepared. The effects of contact time, pH, temperature and initial concentration were explored. The results suggested pH was a negligible factor in adsorption progress. Kinetic studies showed that the experiment data followed pseudo-second-order model. Boyd mode suggested that external mass transfer showed a rather weak rate control for MO adsorption onto Fe 3 O 4 -CS-L. Equilibrium studies showed that isotherm data were the best described by Langmuir model. The maximum adsorption capacity of MO estimated to be 338.98 mg/g at 298 K. Moreover, the adsorption capacity of Fe 3 O 4 -CS-L can keep about 74% in the fifth adsorption–regeneration cycle. Thus, the Fe 3 O 4 -CS-L could be a kind of promising material for removing MO from wastewater.
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 100
·98520-98527
·
IF 3.289
Huachao Zai,Yizhou Zhao,Shanyu Chen,Rui Wang,Lei Ge,Changfeng Chen,Yujing Li
Recycling of noble-metal-based catalysts remains difficult and limits their applications towards catalysis in organic synthesis reactions with high viscosity. This work demonstrates a magnetically responsive hydrosilylation catalyst with novel core–shell nanostructure, which can be recycled from highly viscous reaction solutions. The supporting material, with core–shell structure, incorporates a Fe3O4 nanoparticle as the core coated with silica shell through reverse microemulsion approach to form SiO2/Fe3O4 nanoparticles which show superparamagnetic behavior. Ultrafine Pt NPs are facilely prepared and loaded on SiO2 shell via a simple hydrothermal protocol, forming Pt/SiO2/Fe3O4 catalyst. As-synthesized catalysts exhibit high catalytic activity towards the hydrosilylation of allyl polyether with low-hydro silicone oil. Despite the high viscosity of the reaction system, the catalyst dispersed in reaction solution shows superparamagnetic response upon the application of magnetic field and can be recycled up to 7 times without appreciable loss in the catalytic activity. This work demonstrates a highly efficient and recyclable catalyst to catalyze hydrosilylation reaction with high viscosity and proposes a new philosophy to design reusable catalyst for organic reaction.
✓ 已验证
DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2026
·
IF 2.3
Haiming Guo,Guorong Ma,Yingqi Huang,Shuxi Shi,Dong Ding,Yan Wang
In this work, an in-situ polymerization of pyrrole was performed to coat Fe3O4 nanoparticles with a polypyrrole (PPy) layer, yielding magnetically separable Fe3O4@PPy composites. The composite was employed to activate peroxymonosulfate (PMS), facilitating the rapid degradation of sodium diclofenac (DCFS). In this work, PPy encapsulates the metal oxides in a shell layer, effectively reducing the leaching of metal ions. Moreover, the PPy encapsulation promoted the formation of oxygen vacancies (Ovac). PPy and Ovac play a crucial role in promoting electron transfer, with Fe2+, PPy and Ovac being able to synergistically activate the PMS to yield abundant reactive oxygen species (ROS). These ROS contributed to the efficient degradation of DCFS. The degradation efficiency of DCFS (50 mg/L) reached 91.0% within just 2 minutes. Among the influential parameters, the initial pH value emerged as the most significant factor. The quenching experiments demonstrated that both the radical and non-radical pathways contributed synergistically to the DCFS degradation, with 1O2 being the dominant ROS. Finally, Fe3O4@PPy exhibited excellent stability and reusability, maintaining high catalytic performance over six consecutive cycles. This work provided a novel and efficient strategy for the removal of pollutants from wastewater, leveraging the synergistic effect of PPy-coated magnetic catalyst for pollutant removal.
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2026
·Vol. 11
·期 6
·e06885
·
IF 2.3
Jianming Wu,Ziqiang Xiang,Yujie Li,Jiaqi Lv,Xiangfang Peng
Microplastic pollution poses a significant threat to ecosystems and human health, necessitating efficient removal methods. In this study, a magnetic nanocomposite, Fe 3 O 4 /PSS/ZIF-67, was synthesized via a solvothermal method, utilizing poly(sodium p-styrenesulfonate) (PSS) to functionalize Fe 3 O 4 nanoparticles for the in situ growth of ZIF-67. Under ultrasound-assisted conditions, the adsorbent exhibited exceptional performance for polystyrene (PS) microplastics, achieving equilibrium within 15 min with a maximum adsorption capacity of 2816 mg/g. The adsorption process followed pseudo-first-order kinetics and the Langmuir isotherm model. Mechanistic analyses revealed that the removal was driven by synergistic effects of van der Waals forces, electrostatic interactions, hydrogen bonding, and π–π interactions. Furthermore, the Fe 3 O 4 /PSS/ZIF-67 demonstrated broad-spectrum removal capabilities for various microplastics (PP, PE, PET, PMMA, PVC, PA), organic dyes (AB 93, MB, MO, CR, CV, MG, R6G), heavy metal ions (Fe 3+ , Ni 2+ , Cu 2+ , Zn 2+ ), and antibiotics (TC, CIP), demonstrating its potential for wastewater treatment.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2012
·
IF 3.832
Yonghai Song,Zhifang He,Haoqing Hou,Xiaolan Wang,Li Wang
The Fe 3 O 4 –graphene oxide (Fe 3 O 4 –GO) nanocomposites were prepared by a chemical co-precipitation of FeSO 4 , FeCl 3 ,·NH 3 ·H 2 O and GO. The Fe 3 O 4 –GO was characterized by scanning electron microscopy, X-ray powder diffraction, thermogravimetric analysis and electrochemical method. The results showed that ultrafine Fe 3 O 4 nanoparticles was prepared and densely assembled on GO nanosheets. The Fe 3 O 4 –GO exhibits large surface area and high catalysis towards the oxidation of cysteine and N-acetyl cysteine, which could be used for cysteine and N-acetyl cysteine sensing with a wide linear range (0.5–13.5 mM for cysteine and 0.12–13.3 mM for N-acetyl cysteine) and low detection limit (56 μM for cysteine and 25 μM for N-acetyl cysteine). The excellent catalytic activity, high sensitivity and good stability made such Fe 3 O 4 –GO nanocomposites to be promising nanomaterials for constructing nonenzymatic sensor.
✓ 已验证
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2023
·Vol. 38
·期 5
·1003-1009
·
IF 1.6
Wang Jingjing,Zhang Yawen
Fe 3 O 4 and Cu 2 O were successively immobilized on alkali-treated straw, and the magnetically separable straw@Fe 3 O 4 /Cu 2 O composite was obtained. The straw@Fe 3 O 4 /Cu 2 O was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and vibrating sample magnetometry, respectively. Photocatalytic performance of the straw@Fe 3 O 4 /Cu 2 O was evaluated by measuring the degradation of methyl orange (MO) under irradiation of visible light. The introduction of Fe 3 O 4 not only endowed the straw@Fe 3 O 4 /Cu 2 O with magnetic separation feature but also significantly enhanced photocatalytic activity because Fe 3 O 4 could prevent recombination of hole-electron pairs. The active species capture experiment showed that holes (h + ), hydroxyl (·OH) and superoxide (·O 2 − ) radicals all took part in the MO degradation. In addition, the photocatalytic mechanism of straw@Fe 3 O 4 /Cu 2 O was proposed based on the experimental results. After five cycles for the photodegradation of MO, the straw@Fe 3 O 4 /Cu 2 O still displayed good photocatalytic activity, suggesting that the as-prepared composite had great potential for practical use in wastewater treatment.
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 109
·63611-63619
·
IF 3.708
Huaiyu Chen,Lei Li,Dong Liu,Huajun Huang,Jianping Deng,Wantai Yang
This article reports the first coordination–precipitation polymerizations for preparing chiral, magnetic composite microspheres consisting of helical substituted polyacetylene and Fe3O4 nanoparticles. The microspheres were obtained in high yield (>85%) and characterized by XRD, FT-IR, SEM, TEM, CD and UV-vis absorption techniques. TEM and SEM images showed that the microspheres were approx. 600 nm in average diameter and possessed a spherical morphology with a rough surface. CD and UV-vis absorption spectra demonstrated that the polyacetylene chains constructing the microspheres adopted helical structures of a predominantly one handed screw nature, which enabled the microspheres to show remarkable optical activity. The microspheres also performed desirable magneticity. They were further used as chiral selectors efficiently inducing enantioselective crystallization of D- and L-alanine as model chiral enantiomers. Moreover, the microspheres can be easily restored under the assistance of an external magnetic field. The coordination–precipitation polymerizations provide a versatile platform for preparing advanced chiral and non-chiral, magnetic hybrid microspheres.
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2018
·
IF 4.514
Yuxin He,Qiuyu Chen,Song Yang,Chang Lu,Mengting Feng,Yuanli Jiang,Guoxi Cao,Jianping Zhang,Chuntai Liu
The epoxy nanocomposites with Fe 3 O 4 modified graphene oxide (Fe 3 O 4 /GO) were used to influence the micro-cracks resistance of carbon fiber reinforced epoxy (CF/EP) laminate at 77 K. Fe 3 O 4 /GO with good paramagnetic properties were prepared by co-precipitation method and used to modify epoxy for cryogenic applications. Fe 3 O 4 /GO modified CF/EP laminates were also prepared through vacuum-assisted resin transfer molding (VARTM). The results show that the Fe 3 O 4 /GO can effectively improve the mechanical properties of epoxy (EP) matrix at 77 K and reduce the coefficient of thermal expansion (CTE) of EP matrix. It also can obviously improve the micro-cracks resistance of CF/EP composites at 77 K. Compared to neat EP, the CTE of Fe 3 O 4 /GO modified EP composite is decreased 51.6%. Compared to CF/EP composite, the micro-cracks density of Fe 3 O 4 /GO modified CF/EP composite at 77 K is decreased 60.0%.
研究领域:
材料科学
·
高分子复合材料
·
低温工程
·
纳米复合材料
·
力学性能
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 21
·52199
·
IF 3.057
Wenjiao Wang,Mingming Zheng,Jiajia Ren,Mingliang Ma,Xunqian Yin,Tingxi Li,Yong Ma
Magnetic Fe 3 O 4 /MnO 2 /TiO 2 /polypyrrole (PPy) heterostructure as adsorbent for adsorbing Mn 7+ was synthesized by combining hydrothermal method and chemical oxidation method. The heterostructure was characterized by field-emission scanning electron microscope, Fourier transform infrared spectroscopy, X-ray diffraction, and vibrating sample magnetometer. Its saturation magnetization is 18.88 emu/g, so it is easy to separate it from the solution. The feasibility of Fe 3 O 4 /MnO 2 /TiO 2 /PPy heterostructure to remove Mn 7+ was researched in detail. It is found that the optimal pH is 2. The initial adsorption rate can reach 4.60 mg/g min. At 288.15 K, the maximum equilibrium adsorption capacity is 202.8 mg/g. Adsorption kinetics follows a pseudo second order model, as well as is determined by through membrane diffusion processes. The Langmuir isotherm model is used to describe the adsorption isotherm behavior. Besides, thermodynamic parameters indicate spontaneous adsorption behavior, and entropy of the endothermic reaction increases. Finally, the cycle test results show that the adsorbent has better cycle performance, displaying broad application prospects.
研究领域:
环境科学
·
材料科学
·
化学工程
·
纳米技术
·
污染控制
✓ 已验证
DOI
高影响因子
CARBON
·
2026
·
IF 12.7
Xueyang Wang,Jiaxin Yao,Yi Luo,Bo Niu,Zhe Su,Donghui Long
Ion-exchange resin serve as dual sulfur/carbon sources for C/FeS/Fe 3 O 4 . • Sulfur vacancies and heterointerfaces synergistically boost polarization loss. • Synergistic dielectric-magnetic loss mechanisms yield RL min of −69.2 dB. • Flexible C/FeS/Fe 3 O 4 -silicone rubber plate shows excellent application potential. Transition metal sulfide (TMS)-based composites have shown great promise for microwave absorption, yet achieving high attenuation and broadband absorption simultaneously remains a critical challenge. Herein, ion-exchange resin is innovatively employed as a dual source of sulfur and carbon to prepare a magnetic C/FeS/Fe 3 O 4 composite rich in sulfur vacancies, which achieves synergistic dielectric-magnetic dissipation for efficient electromagnetic wave (EMW) absorption. The preparation involves a simple process of ion exchange, physical adsorption and carbonization, during which FeS and Fe 3 O 4 are generated in situ on the resin-derived porous carbon skeleton. The abundant sulfur vacancies, heterogeneous interfaces, and three-dimensional conductive network synergistically enhance dipole polarization, interfacial polarization and conductive loss. Moreover, the ferromagnetic Fe 3 O 4 component contributes to magnetic loss. These synergistic dielectric-magnetic loss mechanisms endow C/FeS/Fe 3 O 4 composite with both excellent attenuation capacity and favorable impedance matching. Consequently, the composite delivers outstanding EMW absorption performance, exhibiting a minimum reflection loss (RL min ) of −69.2 dB at a thickness of 1.65 mm and an effective absorption bandwidth (EAB) of 5.1 GHz at 1.50 mm. Radar cross-section (RCS) simulations demonstrate that C/FeS/Fe 3 O 4 can significantly suppress radar-wave scattering, achieving a maximum RCS reduction of 28.0 dB m 2 . Furthermore, the composite shows excellent application potential when incorporated into a flexible, heat-dissipating, microwave-absorbing C/FeS/Fe 3 O 4 -silicone rubber plate. This work provides valuable insights into the rational design and fabrication of high-performance TMS-based EMW absorbers. Download: Download high-res image (445KB) Download: Download full-size image
✓ 已验证
产品关联
DOI
高影响因子
Antibiotics-Basel
·
2026
·Vol. 15
·期 7
·702
·
IF 5.5
Zong-Nan Li,Lei Qian,Qing-Yi Li,Yi Qin,Pan Deng,Jian-Jun Guo,Huai-Jian Liao
Background/Objectives: Antimicrobial peptides (AMPs) in insect hemolymph are promising alternatives to conventional antibiotics, but their rapid screening from complex biological matrices remains difficult. This study aimed to develop a simple and efficient method for the enrichment and preliminary identification of putative AMPs from the hemolymph ofClanis bilineata tsingtauicalarvae.Methods: Phospholipid-coated magnetic nanoparticles (Fe3O4@L) were prepared using membrane phospholipids identified fromEnterococcus faeciumby time-of-flight mass spectrometry. After nanoparticle characterization, enrichment conditions were optimized and the Fe3O4@L workflow was compared with a conventional ultrafiltration-electrophoresis-silver staining-mass spectrometry (UESM) method. Peptides were identified by de novo mass spectrometry, followed by sequence filtering, replicate screening, and in silico AMP prediction. Candidate peptides were chemically synthesized and evaluated for antibacterial activity, minimum inhibitory concentration (MIC), growth inhibition, morphological effects, and hemolytic activity.Results: Optimization of the Fe3O4@L method resulted in a 1.86-fold increase in peptide concentration in the enriched fraction. Compared with UESM, Fe3O4@L reduced the workflow from four steps to three and shortened processing time by 61.2%. De novo analysis generated 724 filtered peptides, of which 58 were reproducibly detected in at least two replicates, yielding five putative AMPs after activity prediction; no putative AMP was identified by UESM under the same conditions. Among the synthesized peptides, CBT-3 showed antibacterial activity againstE. faeciumandEscherichia coli, with MICs of 32 and 64 mg/L, respectively, and low hemolytic activity toward human erythrocytes.Conclusions: Fe3O4@L provides a simple and effective strategy for preliminary AMP screening from insect hemolymph, and CBT-3 represents a promising peptide candidate for further investigation.
✓ 已验证
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）