CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Mantang Chen,Nan Wang,Xiaobo Wang,Yu Zhou,Lihua Zhu
Magnetic Fe 3 O 4 @ZIF-67 composites were prepared, characterized, and used as heterogeneous catalysts to activate peroxymonosulfate (PMS) for the degradation of tetrabromobisphenol A (TBBPA). It was observed that all the added TBBPA (40 mg L −1 ) was completely degraded in 3 min in the Fe 3 O 4 @ZIF-67 (0.1 g L −1 ) + PMS (0.1 g L −1 ) system with a pseudo second-order degradation rate constant ( k ) of 110.3 L g −1 min −1 , being nearly 10 times that (11.8 L g −1 min −1 ) in the ZIF-67 + PMS system and 2000 times that (0.06 L g −1 min −1 ) in the Fe 3 O 4 + PMS system. The observed synergistic catalysis between Fe 3 O 4 and ZIF-67 in Fe 3 O 4 @ZIF-67 enhanced not only the degradation of TBBPA, but also the TOC removal and the release of Br − during the degradation of TBBPA. Multiple reactive species including OH, SO 4 − and 1 O 2 were responsible for the degradation of TBBPA, but 1 O 2 was the dominant one. The synergistic catalytic mechanism of PMS activation by Fe 3 O 4 @ZIF-67 was proposed, which mainly involved the electron donating ability of Fe 2+ in Fe 3 O 4 for enhancing the Co 3+ /Co 2+ cycle. Moreover, Fe 3 O 4 @ZIF-67 showed good recyclability and could be easily recycled by magnetic separation. This work provides an opportunity to construct highly efficient catalysts with magnetic recycling capability.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Zhennan Liu,Naiqin Zhao,Chunsheng Shi,Fang He,Enzuo Liu,Chunnian He
Three-dimensional (3D) carbon networks decorated with Fe 3 O 4 nanoparticles as lightweight and broadband electromagnetic (EM) wave absorber were in-situ prepared via a simple and large-scale method, combining freeze-drying and high-temperature calcination processes. SEM and TEM results show that 3D carbon network/Fe 3 O 4 (3DC/Fe 3 O 4 ) composites have interconnected 3D porous carbon networks with submicrometer-sized macropores, and the Fe 3 O 4 nanoparticles are distributed uniformly on the 3D carbon networks. The EM wave absorption performance of 3DC/Fe 3 O 4 can be tuned by changing Fe 3 O 4 contents. The 3DC/Fe 3 O 4 with about 38.2 wt% Fe 3 O 4 exhibits excellent lightweight and broadband EM wave absorption property. The effective absorption bandwidth can reach up 5.95 GHz (11.2–17.15 GHz) at the thickness of 3.0 mm with only 20 wt% filler loading. The minimum RL of −37.8 dB was obtained at 6.95 GHz. The excellent EM wave absorption capability of 3DC/Fe 3 O 4 can be ascribed to good impedance matching, strong dielectric loss ability and unique 3D porous structure. This work demonstrates that the 3DC/Fe 3 O 4 with light weight, broad absorption bandwidth and large-scale production potential can be a promising absorber for practical application.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2025
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IF 4.9
Meng Cheng,Mengyao Hua,Siyi Wang,Yuhang Duan,Lei Xu,Yafen Zhou
TiO 2 and its composites have drawn extensive focus from researchers on account of their ability to convert formaldehyde into harmless H 2 O and CO 2 under light irradiation at room temperature, along with their low toxicity, simple operation, low cost and reusability. In this study, a MOF@Fe 3 O 4 –TiO 2 photocatalyst with synergistic degradation effects was synthesized via ultrasonic-assisted impregnation method and comprehensively characterized. Results show that this composite can efficiently remove formaldehyde through its self-established adsorption-degradation-reabsorption cycle (85.50 % within 5.5 h; 92.60 % within 24 h). Moreover, it exhibits enhanced transient photocurrent, which not only facilitates the segregation of electrons and holes across Fe 3 O 4 –TiO 2 heterostructure but also promotes generation and transport of photogenerated electrons between the Fe 3 O 4 –TiO 2 heterojunction and MOF, endowing the catalyst with excellent conductivity and full-spectrum-driven photocatalytic activity. Additionally, EPR and stability tests reveal that the composite decomposes formaldehyde to carbon dioxide and water through formation of two reactive oxygen species (•O 2 − and •OH) and demonstrates good stability.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Mei Li,Mengyao Liu,Jia-Cheng E. Yang,Zhiqiang Zhao,Yaobin Zhang
Pretreating organic wastes with yeast to produce alcohol has been widely recognized as an effective method to stimulate digester communities to continuously perform direct interspecies electron transfer (DIET) during anaerobic digestion. However, the increase in the costs of additional facilities (e.g., pretreatment tank) and the continuous addition of yeast limit its practical applications. In this study, a strategy of in situ enhancement of alcohol production by Candida krusei (CK) immobilized with Fe3O4 nanoparticles (nFe3O4) during anaerobic digestion was proposed. The results showed that CK cells were immobilized with nFe3O4 via physisorption and chemical bonding. Investigations on extracellular polymers via the three-dimensional excitation–emission matrix showed that nFe3O4 promoted the secretion of tryptophan proteins, fulvic acids, and humic acids by CK, indicating an improvement in the cell stability and metabolic activity. With CK-nFe3O4, the efficiencies of alcohol production reached 0.92 mol/molglucose, which was 46.0 ± 1.5% higher than that with only CK (0.63 mol/molglucose). Meanwhile, with CK-nFe3O4, the catalytic periods of cells reached four cycles, which was two-fold that of with only CK (two cycles). Further analysis of diffusion showed that nFe3O4 improved mass transfer, alleviating substrate/product inhibition during alcohol-producing fermentation. Based on these advantages, the cumulative methane production with CK-nFe3O4 was increased by 56.3 and 34.6%, respectively, compared to that without CK-nFe3O4 and with only CK during anaerobic digestion.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2025
·Vol. 36
·期 31
·1-21
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IF 2.8
Abdul Waras,Sun Yukun,Zhao Minqi,Zhao Xinyi,Guo Jiang,Wu Wenling,Zhu Jianfeng
The swift progress in 5G wireless signal propagation and electronic technologies has potentially enhanced the quality of life. Nevertheless, it also raises serious concerns regarding electromagnetic (EM) interference and potential health risks, thereby necessitating the development of novel composites with intense EM wave (EMW) absorption performance, wide bandwidth, lightweight characteristics, and environmental stability. This research provides the synthesis and comprehensive characterization of a novel Fe 3 O 4 -decorated carbon nanofiber (Fe 3 O 4 @C) encapsulated within a polypyrrole (PPy) shell and then embedded in an epoxy matrix, engineered to optimize EMW absorption and mechanical property. The solvothermal synthesis of Fe 3 O 4 @CNFs, followed by in situ polymerization of PPy, yielded a hierarchical structure that synergistically enhanced the magnetic loss, dielectric loss, and interfacial polarization . Structural analyses, including SEM, XRD, FT-IR, and Raman spectroscopy, verified the successful integration of Fe 3 O 4 nanoparticles on the surface of carbon nanofibers (CNF) and their effective encapsulation by PPy, which improves the oxidative stability and impedance matching. The 4 wt% Fe 3 O 4 @CNF/PPy epoxy nanocomposites exhibit the exceptional EMW absorption performance, achieving a minimum reflection loss of − 23.51 dB at 16.08 GHz (2.05 mm thickness) with a superior effective absorption bandwidth (EAB) of 6.40 GHz (11.60–18.00 GHz) at 2.31 mm thickness, ascribed to the synergistic impedance matching and attenuation effects. Moreover, mechanical testing revealed a 9.7% improvement in tensile strength (89.49 MPa) compared to the cured epoxy for the 5 wt% epoxy nanocomposites, attributed to crack-pinning and stress-transfer mechanisms. The incorporation of PPy enhanced charge transport and corrosion resistance, while promoting multiple scattering and polarization effects, and 1-D magnetic CNF significantly improved EMW attenuation and mechanical property. The study underscores the dual functionality of the nanocomposites, merging robust mechanical property with broadband microwave absorption, offering a scalable solution for next-generation EMW absorbers in aerospace and telecommunications.
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CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Zhuoqun Deng,Nianxi Wang,Yang Wang,Xujing Li,Haixiang Li,Dexun Zou,Yanping Liu
Due to the persistence and toxicity of PAHs, the accumulation of PAHs in soil causes environmental challenges. Utilizing nanoparticles to activate persulfate (PS) is an eco-friendly and cost-effective method for degrading PAHs. Herein, an advanced oxidation system with Fe 3 O 4 and CeO 2 loaded on BC as PS activators (Fe 3 O 4 -Ce@BC/PS) has been constructed, achieving a total removal of 89.34 % of PAHs from soil at 48 h of reaction at room temperature. Notably, High Resolution Transmission Electron Microscope analysis confirmed the presence of a CeO 2 -Fe 3 O 4 heterojunction, and Density functional theory calculations further revealed the key function of this structure. It reduced the adsorption energy of PS (−4.03 eV), thereby improving its utilization efficiency. In addition, during the reaction process, OH and SO 4 − as the main active species collaborated with 1 O 2 , O 2 − and electron transfer to degrade PAHs. In a word, the Fe 3 O 4 -Ce@BC/PS system developed in this study provided an effective solution to the problem of PAHs-contaminated soil.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Suci Meng,Shichao Sun,Yu Liu,Yikai Lu,Min Chen
Earth-abundant Fe-based oxides have drawn less attention in electrocatalytic water splitting owing to the inferior intrinsic activity and poor conductivity. Therefore, developing an effective method to increase the catalytic performance of Fe-based oxides is of great importance for the practical application. Herein, a novel Cr/N co-doped Fe 3 O 4 electrocatalyst (denoted as Cr-Fe 3 O 4 -N/NF) is designed and prepared by a simple immersion treatment followed by a calcination method for efficient water splitting. The resultant Cr-Fe 3 O 4 -N/NF shows significant catalytic activity for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) with overpotentials of 218 and 95 mV at 10 mA cm –2 . Furthermore, the water splitting system using Cr-Fe 3 O 4 -N/NF could afford a current density of 10 mA cm –2 at 1.53 V, which is superior to two-electrode system composed of Pt/C and RuO 2 . The high activities are attributed to the synergistic effect between Cr and N element doping. Specifically, the introduction of electron-deficient Cr is conductive to accelerate the dissociation process of water, adsorption process of intermediates, adjust the electronic structure. Simultaneously, N doping can increase the adsorption of H intermediates, provide more active sites for hydrogen absorption, and improve the electrical conductivity. This study provides a new strategy for Cr and N co-doped metal oxides electrocatalysts for high-performance water splitting.
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Polymer Chemistry
·
2019
·Vol. 11
·期 6
·1177-1187
·
IF 4.76
Yu Yang,Haichao Duan,Siwen Xia,Changli Lü
A novel and convenient method for fabricating homogeneous nanocatalysts with high catalytic activity and controllable reusability is promising for catalytic reduction. In this study, a high-efficiency magnetic recyclable nanocatalyst (PFe3O4@CD@PdNPs) was successfully prepared via depositing highly dispersed palladium nanoparticles (Pd NPs) on a thermo-responsive copolymer support functionalized with superparamagnetic Fe3O4 nanoparticles (NPs) with carbon dots (CDs) as both a stabilizing and reducing agent. The thermo-responsive copolymers with catechol end groups could be facilely anchored onto Fe3O4 NPs (PFe3O4) through a mussel-inspired chemistry strategy. The well-dispersed ultrafine Pd NPs were located on Fe3O4 NPs decorated with copolymer brushes using an episulfide ligand-containing copolymer as a costabilizer. Fourier transform infrared spectroscopy, thermogravimetric analysis and other tests proved that the copolymer brushes were successfully grafted on the surface of the Fe3O4 NPs. Moreover, transmission electron microscopy and X-ray photoelectron spectroscopy confirmed the presence of CDs in the nanohybrids. In addition, the PFe3O4@CD@PdNPs showed interesting thermo-responsive catalytic behaviour because of the presence of thermo-responsive polymer chains on the catalyst surface. Finally, owing to good water dispersibility and the synergistic effect of the Pd NPs with CDs, the PFe3O4@CD@PdNP nanocatalyst possessed higher catalytic activity for the catalytic reduction of different dyes and nitrophenols compared with PdNP@PFe3O4 without CD modification.
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CHEMOSPHERE
·
2018
·
IF 4.427
Huiwang Dai,Shuying Xu,Jianxin Chen,Xiaozeng Miao,Jianxi Zhu
Oxalate enhanced mechanism of Fe 3 O 4 @γ-Fe 2 O 3 was developed to provide novel insight into catalytic process regulation of iron oxide catalysts in heterogeneous UV-Fenton system. And the iron oxide composite of Fe 3 O 4 @γ-Fe 2 O 3 was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), fourier transform infrared (FTIR) spectroscopy and nitrogen adsorption-desorption isotherms. The results showed that large amount of iron could be leached from catalyst in the presence of oxalate, which promoted the homogeneous UV-Fenton reactions in solution. Orange II degradation could be significantly enhanced with the increase of the ratio of homogeneous UV-Fenton process to heterogeneous UV-Fenton process. The optimum concentration of oxalate determined by experiment was 0.5 mM in oxalate enhanced heterogeneous UV-Fenton system. On this condition, the pseudo-first-order rate constant value of Orange II degradation was 0.314 min −1 , which was 2.3 times as high as that in heterogeneous UV-Fenton system. The removal rates of color and TOC were 100% and 86.6% after 20 min and 120 min treatment, respectively. In addition, the iron ions in solution could be almost completely adsorbed back to the catalyst surface in later degradation stages of Orange II. During the recycle experiments, the results showed that the increase of pH in solution and the sorption of intermediates on the catalyst surface would hinder oxalate enhanced process and lead to a decrease of degradation rate of Orange II in oxalate enhanced heterogeneous UV-Fenton system.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 325
·期 2
·453-462
·
IF 1.137
Lu Shichao,Chang Shuquan,Li Zheng,Zhang Xiaohong,Hu Xiaodan,Zhang Haiqian
Magnetic Au/Fe 3 O 4 /poly(styrene-sodium styrene sulphonate) composite microspheres (Au/Fe 3 O 4 /P(St-NaSS) CMs) were successfully prepared via a gamma-radiation method. Au and Fe 3 O 4 were formed at the same time under irradiation and well dispersed on uniform P(St-NaSS) microspheres. The as-prepared CMs exhibit good catalytic properties and recyclable performances for the catalytic reduction of 4-nitrophenol (4-NP). The kinetic rate constants are 8.75 × 10 −3 s −1 and 7.71 × 10 −3 s −1 for two samples, respectively. The conversion rate of 4-NP can keep about 95% with catalysts after five cycles. They exhibit good magnetic behavior and have saturation magnetization value of about 9 emu g −1 , which can be easily separated from the solution under external magnetic field. This strategy is efficient and facile, which can be extended to fabricate other CMs.
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Desalination and Water Treatment
·
2024
·
IF 1
Hongting Ye,Xiaoxing Zeng,Fei Feng,Yuanhang Li,Xiaofeng Gong
ABSTRACT In this study, novel recyclable composite BiOBr/chitin-Fe 3 O 4 was synthesized by a solvothermal method using magnetic chitin chelating bismuth oxybromide (BiOBr) as precursor. The morphology, structure, photoelectric properties and chemical composition of the obtained samples were explored extensively by various characterization techniques. Due to the introduction of Fe 3 O 4 and chitin, the composite BiOBr/chitin-Fe 3 O 4 has multi-functions in enlarging photo response performance, reducing the band gap, increasing specific surface area and inhibiting recombination rate, which are essential to improve the photocatalytic efficiency. Using ciprofloxacin as target pollutant, the composite showed excellent photocatalytic performance under visible light irradiation, the apparent rate constant value of BiOBr/chitin-Fe 3 O 4 is 5.8 times higher than that of pure BiOBr. The composite BiOBr/chitin-Fe 3 O 4 could be recycled and reused conveniently and effectively, and the catalyst possessed good photocatalytic stability with the degradation efficiency remaining unchanged even after five times circle. The possible degradation mechanism was discussed on the basis of experiments.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Fan Zhou,Jiyuan Wang,Yimei Tang,Xuhang Song,Wanrong Zhou,Yan Li,Feng Gao
Rapid and accurate monitoring of glucose concentration is of great significance in clinical diagnosis and treatment of diabetes and hence, it is necessary to develop glucose sensors of superior electro-catalytic capacity. Most literature utilize synergistic effect of nanocomposites to enhance glucose sensing performance, whereas it suffers from crucial restriction in physical and chemical characteristics of each constituents. Morphology of nanostructures significantly affects the electro-catalytic capacity, thus it is a novel route to improve glucose sensing performance to adjust morphology of nanostructures . Herein, we presented highly sensitive non-enzymatic electrochemical sensors for rapid and accurate glucose analysis with hollow Fe 3 O 4 nanospheres (Fe 3 O 4 NSs) of controllable morphologies decorated on flexible fibers. The morphologies of the Fe 3 O 4 NSs were evaluated with quantitative parameters like diameter, roundness , roughness, skewness, and kurtosis acquired from SEM images and image processing algorithms , and their effect on the interfacial characteristics and the electro-catalytic capacity of the glucose sensors was investigated. Owing to the unique spherical nanostructures and superior catalysis, the Fe 3 O 4 NSs exhibit desirable solid/liquid interface for mass diffusion and abundant active sites for sufficient oxidation of glucose. Moreover, much rounder and rougher Fe 3 O 4 NSs of near Gaussian surface are readily produced at a higher Fe 3+ concentration and result in favorable sensing performance. Accordingly, the optimal glucose sensor shows sensitivities of 96.1 ± 5.4 μA mM −1 cm −2 and 38.2 ± 2.2 μA mM −1 cm −2 over a preferable range of 0–18.0 mM, and a lower detection limit of 19.2 μM. Besides, the glucose sensors remain acceptable response after continuous testing for 20 times and repetitive bending for 50 times, and display superior selectivity to glucose and accurate analysis to practical samples. It is a facile and effective methodology to regulate the morphologies of the Fe 3 O 4 NSs for enhanced electro-catalytic capacity of glucose sensors.
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