Nanoscale
·
2014
·Vol. 6
·期 14
·7954-7958
·
IF 6.739
Wenya Cai,Xianghu Tang,Bai Sun,Liangbao Yang
In this study, multifunctional Fe3O4/C/Au nanoparticles (NPs), which catalytically integrated active small Au NPs with surface-enhanced Raman scattering (SERS) active large Au NPs, were fabricated via a facile method and employed for the in situ SERS monitoring of a catalytic reaction of p-nitrothiophenol (p-NTP) to p-aminothiophenol (p-ATP). In addition, the effect of magnet power was tested and it was demonstrated that the SERS intensity of the reaction system was stronger, and the reaction proceeded more smoothly because more hot spots existed and remained the same in the magnetic field; hence, the catalytic rate could be determined.
研究领域:
纳米材料
·
催化化学
·
分析化学
·
光谱学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2024
·
IF 2.7
Honglin Qin,Ruozhu Xu,Lizhen Qiao,Xupeng Zhai,Peixin Guo,Chen Li,Bingyan Han
The widespread use of endocrine disruptors (EDPs) has certain potential hazards to organisms and environments, and it is particularly important to develop effective pretreatment methods before detection of EDPs in complex samples. In this work, a novel magnetic nanocomposite decorated with layered double hydroxides (LDHs) and carbon dots (CDs) was designed and prepared for magnetic solid-phase extraction (MSPE) of EDPs (bisphenol S, bisphenol F, bisphenol A, bisphenol AF, diethylstilbestrol and 4-cumylphenol) combined with high-performance liquid chromatography-ultraviolet (HPLC-UV) detection. The prepared composites were characterized by field emission scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS), and the adsorption mechanism towards these EDPs might be mainly based on hydrogen bonds and π–π conjugation. Under the optimized conditions, the proposed method showed limits of detection within 0.05–0.50 μg L−1 and limits of quantitation within 0.2–2.0 μg L−1, and good linearity (R2 ≥ 0.9975) was presented in the range of 0.2–200 μg L−1. Finally, the Fe3O4@C@NiCo-LDH@CDs composite-based MSPE-HPLC-UV method was applied for enrichment and determination of EDPs in water, milk, and tea beverage samples with recoveries in the range of 81.2–119.8% and relative standard deviations below 9.7%.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yuye Dou,Wenda Li,Guobo Chen,Xiangyi Zhang,Xiaohui Jiang,Liangmin Yu,Xia Li
For high-performance electromagnetic wave (EMW) absorbers, designing inventive porous structures and developing multicomponent hybrid strategies remain challenging. Herein, crumpled porous Fe 3 O 4 /carbon composite microspheres (CMs/Fe) were synthesized via a multi-component pore-forming mechanism. By leveraging the rich nitrogen/oxygen functional groups and strong cross-linking properties of a monomer, namely triallyl isocyanurate (TAIC), the crumpled morphology, pore size, and nitrogen content of CMs/Fe were effectively regulated by adjusting the TAIC content. During carbonization, Fe 3 O 4 reduced to Fe particles, which catalyzed the formation of additional pore structures, increasing the specific surface area and further optimizing impedance matching. This is distinct from the previously reported Fe 3 O 4 /C composite. Additionally, the incorporation of magnetism into the carbon matrix enhanced the performance of the carbon material. Deionized water was used as the solvent throughout the synthesis process, making entire process ecofriendly and sustainable. Owing to electromagnetic synergistic attenuation, the CMs/Fe-2, with a low filling ratio of 16.7 %, exhibited a minimum reflection loss (RL min ) of −54.3 dB at an ultrathin thickness of 2.0 mm, with an effective absorption bandwidth (EAB) of 5.26 GHz. This work provides new insights into the fabrication of lightweight magnetic/carbon composite materials as the leading candidates for EMW absorption applications.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
·
IF 3.205
Nan Mei,Bing Liu
Catalytic reduction of nitro compounds to the amines is of high importance in modern synthetic chemistry . In this study, an efficient method was developed for the transfer hydrogenation of nitro compounds over a magnetic Pd catalyst by the use of NaBH 4 as the hydrogen donor . Full nitrobenzene conversion and high selectivity (>99%) of aniline were produced after 1 h at 60 °C in ethanol. The reductions are successfully carried out in presence of a wide variety of other reducible functional groups in the molecule, except halogen and vinyl substitute nitrobenzene. Kinetic studies indicated the active energy for the transfer hydrogenation of nitrobenzene was 20.93 KJ mol −1 . The transfer hydrogenation of nitrobenzene was confirmed to proceed via azobenzene as the intermediate. More importantly, the catalyst was very stable without the loss of its catalytic activity .
研究领域:
化学
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2026
·Vol. 56
·期 11
·229
·
IF 3.7
Chen Jialin,Tan Bo,Du Juan,Wang Qiang,Zhang Ting,Wang Lin
The anode as a critical component of microbial fuel cells (MFCs) directly influences microbial colonization and electron transfer efficiency. In this study, an iron-carbon composite material was synthesized through a one-step pyrolysis method using maltose as the carbon source. Phase analysis confirmed that the material with a composite consisting of Fe 3 O 4 embedded in a carbon matrix (Fe 3 O 4 @CM) was successfully synthesized. Electrochemical characterizations revealed that the electrode modified with Fe 3 O 4 @CM exhibited an electrochemical active area of 65.93 cm 2 and a specific capacitance of 299.4 mF cm −2 , both of which surpassed those modified with Fe 2 O 3 , Fe 3 O 4 and CM. Air–cathode (AC) MFCs were constructed using carbon felt (CF) with different modification materials as the anodes. The influence of various anodes on AC-MFC performance was systematically evaluated through cyclic voltammetry, electrochemical impedance spectroscopy, polarization curves, charge–discharge experiments, and chemical oxygen demand tests. Polarization curve measurements demonstrated that the maximum power density of the AC-MFC with Fe 3 O 4 @CM/CF anode was 861.1 mW m −2 , representing a 2.16-fold enhancement over the AC-MFC with unmodified CF (398.5 mW·m −2 ). Under identical conditions, the Fe 3 O 4 @CM/CF anode exhibited the highest output voltage, the largest electrochemical active area, the lowest internal resistance, and the highest coulombic efficiency, collectively contributing to enhanced power generation. Graphical abstract
✓ 已验证
DOI
高影响因子
IONICS
·
2025
·
IF 2.6
Yong Daming,Kang Xiaomeng,Yin Ming,Wu Qichao
First, a spherical Fe 3 O 4 was synthesized using the hydrothermal method, and subsequently coated with carbon to form a core–shell C/Fe 3 O 4 composite. The Fe 3 O 4 core was then dissolved in an etching solution to create a hollow carbon (H-C) structure. This H-C served as a substrate onto which a Fe 3 O 4 layer was deposited via the hydrothermal method, resulting in a hollow core–shell Fe 3 O 4 /C composite. Finally, the solvothermal method was employed to coat the Fe 3 O 4 /C composite with a layer of hydrogenated titanium dioxide (H-TiO 2 ), resulting in a hollow-structured H-TiO 2 /Fe 3 O 4 /C material. This structure not only ensures the formation of a dual-core shell structure, but also reduces the proportion of carbon material in the composite electrode, thereby enhancing the theoretical specific capacity of the composite electrode. The presence of H-TiO 2 and carbon improved the cyclic stability of Fe 3 O 4 within the composite. This hollow sandwich–structured composite demonstrated excellent electrochemical performance, delivering a discharge specific capacity of 629.5 mAh g −1 after 500 cycles at 0.2 A g −1 , along with a high initial coulombic efficiency of 80.6%.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Xianlin Zhan,Mengqiu Huang,Bicheng Li,Ge Ma,Wenbin You,Yun Tang,Lei Wang,Renchao Che
Rational design of magnetic-dielectric composites proves essential for developing broadband electromagnetic (EM) wave absorbers. However, the non-uniform distribution of magnetic particles within the carbon matrix significantly reduces magnetic coupling efficiency. To overcome this, we employ a confinement strategy to fabricate Fe/Fe 3 O 4 @C composite aerogels that feature a multiscale magnetoelectric coupling network. The confined-growth Fe/Fe 3 O 4 @C nanoscale magnetic‑carbon units construct high-density heterogeneous interfaces, enhancing charge accumulation and interfacial polarization, thereby further strengthening energy dissipation. Meanwhile, under the confinement of the aerogel framework, metal-organic frameworks (MOFs) derived materials in the 2D magnetized micro-flakes maintain their octahedral morphology and collectively establish a continuous, stable nano-micro-macro magnetic coupling network. Moreover, the theoretical investigations including density functional theory calculations, COMSOL Multiphysics simulation, and radar cross-section simulation systematically elucidate the structure-property relationships governing dielectric behavior, magnetic properties, and absorption bandwidth. Notably, the optimized Fe/Fe 3 O 4 @C exhibits remarkable EM absorption performance, achieving a reflection loss of −48.44 dB and a broad bandwidth of 6.88 GHz at 2.15 mm thickness, fully covering the Ku band. Moreover, constructing the periodic structure enables an ultrabroadband absorption of 11.36 GHz at a thickness of only 4.15 mm. This study provides an idea for fabricating multifunctional EM wave absorbers with lightweight, broadband absorption, hydrophobic, thermal insulation, and infrared stealth properties.
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2018
·Vol. 8
·期 14
·3484-3492
·
IF 5.365
Xing Ding,Dong Xiao,Lei Ji,Ding Jin,Ke Dai,Zixin Yang,Shengyao Wang,Hao Chen
The construction of a multifunctional two-dimensional (2D) composite photocatalyst is of great significance because such a composite can exhibit enhanced catalytic performance and improved practical usability in contrast to a single component catalyst. Herein, a ternary photocatalyst composed of g-C3N4, a carbon layer (C), and Fe3O4 nanoparticles was successfully synthesized by a facile one-pot hydrothermal carbonization (HTC) method from g-C3N4, glucose, and FeCl3. The resultant composite, Fe3O4/C/g-C3N4, had an ordered 2D heterostructure and exhibited enhanced visible-light-driven photocatalytic performances and good magnetic recyclability. The kobs for Cr(VI) photoreduction (or dimethoate photodegradation) over Fe3O4/C/g-C3N4 was 20.9-fold (or 2.1-fold) of that over g-C3N4. Comparative study of Fe3O4/C/g-C3N4, C/g-C3N4, and g-C3N4 on their optoelectronic properties revealed that this enhanced photocatalytic activity was mainly due to rapid photogenerated electron transport from the g-C3N4 component to carbon and/or Fe3O4, which effectively suppressed the recombination of photogenerated electrons and holes. In addition, the good surface adsorption capacity of the carbon component towards Cr(VI) also contributed to Cr(VI) photoreduction over Fe3O4/C/g-C3N4. Finally, a reasonable photocatalytic reaction mechanism of Fe3O4/C/g-C3N4 was proposed based on the results of trapping experiments. This study is not only limited to developing a high-performance g-C3N4 based photocatalyst, but also expected to provide a green, facile, and cost-efficient strategy to combine 2D materials with a carbonaceous layer and other functional components for a multifunctional system.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Xueying Li,Yalin Xu,Hui Wu,Xiu Qian,Lizhuang Chen,Yuanyuan Dan,Qing Yu
The porous Fe 3 O 4 nanoaggregates were fabricated by the carbon polyhedron as templates through the hydrothermal method . The carbon polyhedron was obtained by the carbonization of ZIF-67 and subsequent acid treatment. The finial porous Fe 3 O 4 nanoaggregates possess high specific area of 547.5 m 2 g −1 with pore volume of 0.375 cm 3 g −1 . Such unique structures facilitate electrode materials fully exposed to electrolyte solution and maintain the structural stability during fast electrochemical reaction processes. Thereby, porous Fe 3 O 4 nanoaggregates exhibit high specific capacity of 868.7 C g −1 at 2 A g −1 in the wide potential window of −0.90 - 0.45 V in 3 M KOH. After 3000 cycles at 2 A g −1 , the electrode material retains 771.8 C g −1 . Even at high current density of 20 A g −1 , the electrode still delivers 456.1 C g −1 , which is outstanding of other Fe 3 O 4 nanomaterial for supercapacitor . Furthermore, the Fe 3 O 4 //AC asymmetry supercapacitor (3 M KOH as electrolyte) exhibits high energy density of 24.2 Wh kg −1 at power density of 801.1 W kg −1 with excellent cycling performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2026
·
IF 2.6
Zhiru Suo,Fushun Li,Yanjun Zhao,Yuan Zhuang,Binbin Huang,Chen Qu,Yifan Ren,Wenhui Li,Chuandong Wu,Jiemin Liu
The discharge of antibiotics into the environment has emerged as a pressing global issue. In particular, the removal of refractory mixed antibiotics requires advanced technologies with high adsorption efficiency and powerful degradation ability. In this study, we synthesized a heterogeneous core–shell Fe3O4@C catalyst as an efficient microreactor for adsorbing and degrading mixed antibiotics of sulfadimidine (SM2) and enrofloxacin (ENR) in aqueous solution under UV–Fenton conditions. The effects of different experimental conditions on the removal of antibiotics were investigated through L9(43) orthogonal experiments, and the synergistic effect and degradation mechanisms were systematically revealed. The results showed that the Fe3O4@C Fenton system demonstrated significantly enhanced catalytic activity, with hydroxyl radical (OH˙) concentrations of approximately 6.2 and 6.7 times higher than those observed in the Fe3O4 and Fe3O4 + AC Fenton systems, respectively. Moreover, the degradation pathway and mechanism analysis revealed that the adsorption and degradation behavior of the two mixed antibiotics in the Fe3O4@C Fenton system could be better described using pseudo-secondary kinetic models. The substantial improvement clearly indicates that the Fe3O4@C composite serves as a highly efficient microreactor for H2O2 decomposition in the Fenton process, thus providing a new avenue for the degradation of mixed antibiotics in water.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2026
·
IF 10.7
Ji Ma,Jiazhe Yan,Chang Xu,Jianing Gai,Qinzhen Gong,Xiaotao Dai,Chunting Liu,Fengshou Liu
The electrochemical evolution of heterointerfaces in conversion-type anodes has long been poorly understood. Whether engineered interfaces survive cycling, and if not, how separated phases maintain function, remains unclear. Using two model systems Fe 3 C/Fe 3 O 4 /C (inert conductive phase) and Cu 2 O/Cu/C (oxidizable conductive phase), we uncover two diametrically opposite evolution pathways that are dictated solely by the oxidation behavior of the conductive phase. In the inert Fe 3 C system, the initial core-shell interface completely dissociates. Yet the porous carbon network alone maintains electronic connectivity, creating a remote synergy mode in which the carbon network sustains battery operation by compensating for lost heterointerface contact, without requiring direct interfacial contact between the active phases. In the oxidizable Cu system, we directly visualize a phenomenon. Cu 2 O undergoes an electrochemically driven facet reconstruction from the (111) to the (200) orientation, which progressively lowers the overpotential for the Cu → Cu 2 O reaction and makes the electrode self-optimizing with cycling. Post-mortem electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy provide direct visual evidence for both pathways. Kinetic analysis shows mixed diffusion capacitive control, with the CCC system reaching a 46.5% capacitive contribution at 1.0 mV s −1 . Full cells with K-PBA cathodes achieve 75.0% capacity retention after 1000 cycles at 0.5 A g −1 , demonstrating practical viability. This work challenges the long-held assumption that interfacial retention is necessary for electrochemistry. Instead, it establishes a universal design principle for durable conversion-type anodes. Ensuring electron-transport pathway integrity, whether through direct contact or indirect network connectivity, is the key. The discovery of electrochemically driven facet reconstruction also opens new avenues for controlling surface crystallography under operating conditions.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yuzhao Hou,Binyan Yang,Simon Sani Ocholi,Fengchao Wang,Zhifei Fu,Liming Wang,Lifeng Han,Pengli Du,Jia Zhao,Ping He,Zixin Zhang,Erwei Liu
Estrogen compounds in food exhibit bioaccumulation and endocrine-disrupting effects, posing serious risks to ecosystems and human health. Here, a novel core–shell magnetic covalent organic framework (COFs @ Fe 3 O 4 @C NPs) was developed for efficient enrichment and sensitive detection of estrogens in meat samples. The adsorption feasibility and mechanism of TAPB-DVA-COF were investigated using density functional theory (DFT) and molecular dynamics simulation (MDS). DFT calculations confirmed that hydrogen bonding and π–π stacking drive spontaneous adsorption, with adsorption energies ranging from −21.26 to −11.59 kcal mol −1 . MDS further revealed the formation of stable estrogen-COF complexes through close interfacial contact and persistent hydrogen bonding, confirming the existence of low-energy conformations. Based on these insights, COFs were anchored onto polydopamine-modified carbon-coated Fe 3 O 4 nanoparticles at room temperature to fabricate a magnetic adsorbent, which was then employed as a magnetic solid-phase extraction (MSPE) material. The adsorbent exhibited high surface area, strong magnetic responsiveness, and excellent stability. Coupled with high-performance liquid chromatography (HPLC), the established MSPE–HPLC method achieved a wide linear range ( R ≥ 0.9996) and low detection limits (0.21–12.79 μg L −1 ). In pork and chicken samples, recoveries ranged from 91.7 % to 113.5 % with relative standard deviations of 1.0–6.1 %. This study demonstrates the superior performance of COFs @ Fe 3 O 4 @C NPs for estrogen detection and highlights MDS as an efficient and economical tool for predicting adsorption behavior, offering valuable guidance for material design.
研究领域:
分析化学
·
食品安全
·
纳米材料
·
计算化学
·
环境毒理学
·
药物代谢
·
分离科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）