MOLECULES
·
2016
·Vol. 21
·期 8
·1066
·
IF 2.465
Yunhui Zhai,Ruijuan Song,Changhu Zhang,Qun He,Quan Han,Yingjuan Qu
Multi-functional nanoparticles possessing magnetic, fluorescence and transition metal ion response properties were prepared and characterized. The particles have a core/shell structure that consists of silica-coated magnetic Fe3O4and 2,6-diaminopyridine anchored on the silica surface via organic linker molecules. The resultant nanoparticles were found by transmission electron microscopy to be well-dispersed spherical particles with an average diameter of 10–12 nm. X-ray diffraction analysis suggested the existence of Fe3O4and silica in/on the particle. Fourier transform infrared spectra revealed that 2,6-diaminopyridine molecules were successfully covalently bonded to the surface of magnetic composite nanoparticles. The prepared particles possessed an emission peak at 364 nm with an excitation wavelength of 307 nm and have a strong reversible response property for some transition metal ions such as Cu2+and Zn2+. This new material holds considerable promise in selective magneto separation and optical determination applications.
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MATERIALS & DESIGN
·
2026
·
IF 8.2
Xiaoli Li,Fengtian Shi,Yao Lu,Guangshuo Wang,Dong Li,Mengtian Tan
Achieving a balance between high yield stress and superb sedimentation stability remains a great challenge for magnetorheological (MR) fluids. Developing nanocomposites by integrating magnetic particles with low-dimensional nanomaterials is an effective strategy to address this issue. In this study, Fe 3 O 4 /WS 2 nanocomposites were designed and synthesized involving the hydrothermal growth of Fe 3 O 4 nanoparticles onto the exfoliated WS 2 nanosheets. A detailed characterization was conducted using a range of analytical tools such as SEM, XRD, Raman, XPS and VSM to confirm the successful construction of Fe 3 O 4 /WS 2 nanocomposites. The MR fluid was subsequently prepared by dispersing the resulting Fe 3 O 4 /WS 2 nanocomposites into silicone oil. The MR properties were measured under different magnetic field intensities in both steady shear and oscillatory shear modes. The rheological parameters including shear viscosity, shear stress, storage modulus and loss modulus demonstrated a strong dependence on the applied magnetic field intensity. The mechanism involved the formation of more extensive and robust field-induced chain-like structures with increasing field strength. Finally, the sedimentation stability was quantitatively monitored over time and it was revealed the Fe 3 O 4 /WS 2 -based MR fluid exhibited possessed significantly improved sedimentation stability relative to the conventional carbonyl iron particles.
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MICROCHIMICA ACTA
·
2026
·Vol. 193
·期 3
·134
·
IF 5.4
Wu Jiayi,Li Chengwei,Zhao Jingwen,Liu Jiyang
A Mn-doped Fe 3 O 4 (Mn-Fe 3 O 4 ) nanozyme was synthesized using a one-step solvothermal method. Compared to pristine Fe 3 O 4 , Mn-Fe 3 O 4 exhibits unique oxidase (OXD)-like activity and enhanced peroxidase (POD)-like activity. The superior catalytic performance arises from the incorporated Mn species and the associated oxygen vacancies facilitate oxygen adsorption and activation, establishing an efficient self-cascade catalytic system. In this system, hydrogen peroxide (H 2 O 2 ) generated in-situ through OXD-like catalysis can trigger mimic-POD reactions. A dual-mode antioxidant detection platform was subsequently constructed using melatonin (MT) as a proof of concept, with 3,3’,5,5’-tetramethylbenzidine (TMB) serving as the substrate for the Mn-Fe 3 O 4 nanozyme. The colorimetric mode enables rapid visual screening by monitoring the oxidation of TMB to a blue-colored product, achieving a detection limit of 0.13 µM. The electrochemical mode features the novel utilization of mesoporous silica nanochannels for the selective enrichment of oxidized TMB (oxTMB), enabling highly sensitive quantification of MT with a detection limit as low as 0.6 nM. The assay applied to commercial tablets shows excellent recovery and reproducibility. This work combines engineered nanozymes with nanofilm-modified electrodes, offering an innovative approach for constructing advanced multimodal sensing systems. Graphical
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 18
·10743
·
IF 6.208
Teng Wang,Xi Hu,Yujun Yang,Qing Wu,Chengdian He,Xiong He,Zhenyu Wang,Xiang Mao
Metal-based enzyme mimics are considered to be acceptable agents in terms of their biomedical and biological properties; among them, iron oxides (Fe3O4) are treated as basement in fabricating heterogeneous composites through variable valency integrations. In this work, we have established a facile approach for constructing Fe3O4@Ag composite through assembling Fe3O4and Ag together via polyethyleneimine ethylenediamine (PEI) linkages. The obtained Fe3O4@PEI@Ag structure conveys several hundred nanometers (~150 nm). The absorption peak at 652 nm is utilized for confirming the peroxidase-like activity of Fe3O4@PEI@Ag structure by catalyzing 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H2O2. The Michaelis–Menten parameters (Km) of 1.192 mM and 0.302 mM show the higher catalytic activity and strong affinity toward H2O2and TMB, respectively. The maximum velocity (Vmax) value of 1.299 × 10−7M∙s−1and 1.163 × 10−7M∙s−1confirm the efficiency of Fe3O4@PEI@Ag structure. The biocompatibility illustrates almost 100% cell viability. Being treated as one simple colorimetric sensor, it shows relative selectivity and sensitivity toward the detection of glucose based on glucose oxidase. By using indocyanine green (ICG) molecule as an additional factor, a remarkable temperature elevation is observed in Fe3O4@PEI@Ag@ICG with increments of 21.6 °C, and the absorption peak is nearby 870 nm. This implies that the multifunctional Fe3O4@PEI@Ag structure could be an alternative substrate for formatting acceptable agents in biomedicine and biotechnology with enzymatic and photothermal properties.Keywords:Fe3O4@PEI@Ag;assembling process;enzymatic;catalytic performance;photothermal property
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Daoping Ye,Wenxiang Tang,Tao Zhang,Li Lv,Zongpeng Zou,Raju Kumar Gupta,Shengwei Tang
CO 2 hydrogenation to olefines is a feasible carbon capture and utilization (CCU) route. The process includes sequential reactions of reverse water gas shift (RWGS) reaction and Fischer-Tropsch synthesis (FTS) reaction. The acceleration of FTS is crucial to improve the olefines yield. A microemulsion anti-solvent extraction (MAE) method was proposed to prepare Fe-based catalyst on the support of Al 2 O 3 . Ethanol solution of Fe(NO 3 ) 3 was encapsulated in microdroplets, and then loaded on Al 2 O 3 by the extraction of ethanol from the microdroplets to isooctane phase. The average size of micro droplets was 7.5 nm. After calcination , the particle size of Fe 2 O 3 was 6 nm. After carburization with CO, the interface formed between Fe 3 O 4 and Fe 5 C 2 was restricted in a narrow space with a mean size of 12 nm. Through TEM-Mapping, XRD , XPS and TPC characterization, the distribution uniformity of Fe and the neighboring degree of Fe 3 O 4 and Fe 5 C 2 on the as-prepared catalyst MAE-Fe 1 K 1 was improved effectively. An enhanced synergistic effect between Fe 3 O 4 and Fe 5 C 2 was obtained. The catalytic performance evaluation results showed that yield of C 2 -C 4 olefins reached 0.063 mmol·gFe −1 ·s −1 after 12 h of reaction. It exhibited better catalytic performance than most catalysts reported in the literatures. The results showed that the proposed microemulsion anti-solvent extraction strategy is an effective method to prepare Fe-based catalyst for CO 2 -FTO reaction with an excellent catalytic performance.
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-11
·
IF 17.694
Dong Haijiao,Du Wei,Dong Jian,Che Renchao,Kong Fei,Cheng Wenlong,Ma Ming,Gu Ning,Zhang Yu
As pioneering Fe 3 O 4 nanozymes, their explicit peroxidase (POD)-like catalytic mechanism remains elusive. Although many studies have proposed surface Fe 2+ -induced Fenton-like reactions accounting for their POD-like activity, few have focused on the internal atomic changes and their contribution to the catalytic reaction. Here we report that Fe 2+ within Fe 3 O 4 can transfer electrons to the surface via the Fe 2+ -O-Fe 3+ chain, regenerating the surface Fe 2+ and enabling a sustained POD-like catalytic reaction. This process usually occurs with the outward migration of excess oxidized Fe 3+ from the lattice, which is a rate-limiting step. After prolonged catalysis, Fe 3 O 4 nanozymes suffer the phase transformation to γ-Fe 2 O 3 with depletable POD-like activity. This self-depleting characteristic of nanozymes with internal atoms involved in electron transfer and ion migration is well validated on lithium iron phosphate nanoparticles. We reveal a neglected issue concerning the necessity of considering both surface and internal atoms when designing, modulating, and applying nanozymes.
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Surfaces and Interfaces
·
2023
·
IF 6.2
Shijun Nie,Juan Wu,Lan Wang,Fan Cheng,Zhengguang Sun,Xiaobo Chen,Hai Liu,Sheng Wen,Chunli Gong
The trade-off between ionic conductivity and mechanical properties is the key issue facing anion exchange membranes (AEMs) at present. Herein, a new strategy combing three-dimensional (3D) hierarchical nanoarchitecture and magnetic field orientation was proposed to prepare imidazolium-functionalized poly(2,6-dimethyl phenylene oxide) (ImPPO)-based composite AEMs with simultaneously improved ionic conductivity and mechanical strength. Magnetic Fe 3 O 4 @LDH microspheres using Fe 3 O 4 as the core and two-dimensional lamellar anion conductor, layered double hydroxide (LDH), as the shell were prepared through a simple co-precipitation method. The as-prepared Fe 3 O 4 @LDH was then incorporated into ImPPO matrix and induced by an external magnetic field to fabricate Fe 3 O 4 @LDH-orientated composite AEMs. The hierarchical-structured Fe 3 O 4 @LDH can not only effectively avoid the stacking of LDH laminates and thus fully play the ion conduction ability of LDH, but also contribute to the formation of continuous OH − ion transport pathway in the composite system after magnetic field induction. The magnetic-field-oriented membrane with 1% Fe 3 O 4 @LDH doping exhibited ionic conductivity of 128.9 mS cm −1 at 80 °C, which was 43.1% higher than that of pure ImPPO. Moreover, the high dry strength (30.7 MPa) and satisfactory wet strength and flexibility of the composite membrane were also obtained. The assembled direct methanol fuel cell demonstrated a peak power density of 11.7 mW cm −2 , and showed an OCV retention of as high as 94.7% after continuous operation for 100 h, indicating their great potential for fuel cell applications.
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DIAMOND AND RELATED MATERIALS
·
2022
·
IF 3.806
Qi Qu,Huanhuan Wang,Qianpeng Dong,Yan He
In the current work, Ni-Co/CNTs networks were firstly produced by a simple annealing treatment of Ni Co PBA, which was then used as a carbon-based carrier and successfully deposited Fe 3 O 4 nanospheres via a classic hydrothermal reaction process. Additionally, the electromagnetic wave absorption performances of composites could be effectively affected by adjusting the mass ratio of the Fe 3 O 4 nanoparticles . The minimum reflection loss (RL min ) of −48.76 dB was achieved for Fe 3 O 4 @Ni-Co/CNTs-1# at 3.5 mm thickness. Meanwhile, Fe 3 O 4 @Ni-Co/CNTs-2# exhibited a wide effective absorption band (EAB) of 5.9 GHz (12.1–18 GHz) at a 2.0 mm matching thickness, suggesting that the Fe 3 O 4 @Ni-Co/CNTs composites were a promising absorber for electromagnetic wave absorption materials . Based on the synergistic effects of dielectric and magnetic losses generated by Ni-Co/CNTs and Fe 3 O 4 , respectively, and appropriately matched impedances, a new strategy for fabricating lightweight, thin-thickness, strong absorption, and wide-bandwidth materials was provided.
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MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Wenjie Hou,Yan Xing,Claudia Li,Tong Li,Dong Liu,Lusi Ernawati,Jaka Sunarso,Xiuxia Meng
Metal-organic frameworks (MOFs) with intrinsic porosity and high specific surface area have aroused broad interests as a promising electromagnetic (EM) absorbing material. However, the introduction of magnetic components in MOFs has remained as a formidable obstacle for subsequent development. Herein, Fe 3 O 4 /Co-MOF composites were fabricated via a facile and scalable co-precipitation process. The microstructure and morphology of the composites were characterized and the combination of hollow Fe 3 O 4 and Co-MOFs was found to contribute towards the dissipation of incident waves due to the magnetic-dielectric synergistic effect. Impressive microwave absorption ability was obtained with a minimum reflection loss of –56.1 dB over a qualified bandwidth (7.9 GHz) at 2.0 mm. Moreover, the radar cross section simulation further confirmed the effective suppression of radar wave scattering using Fe 3 O 4 /Co-MOF composites. This study provides a versatile strategy for designing magnetic-dielectric composites based on MOFs as effective and broadband microwave absorbers.
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Journal of Water Process Engineering
·
2022
·
IF 7.34
Yujie Zhang,Qin Yang,Luchao Yue,Qian Liu,Yongsong Luo,Junyou Wu,Xiaowen Kang,Shengjun Sun,Yingchun Yang,Xuping Sun
In this work, Fe 3 O 4 nanoparticles anchored biomass juncus derived carbon (Fe 3 O 4 @JDC) was developed as a highly efficient heterogeneous peroxymonosulfate (PMS) activator to degrade organic pollutants. As-prepared catalyst was characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and vibrating sample magnetometer techniques. High loading and good dispersion of Fe 3 O 4 nanoparticles on JDC lead to excellent degradation performance for tetracycline (90.2 %, 60 min) and other pollutants (above 80 %), and the reaction rate constant (k) is 3.73 times (0.0384 min −1 ) than that of pure JDC (0.0103 min −1 ) in the presence of PMS. Additionally, chemical oxygen demand (COD) removal rate of Fe 3 O 4 @JDC/PMS system (64.7 %, 60 min) is best than other systems (JDC system, JDC/PMS system, etc.). The quenching tests and electron paramagnetic resonance (EPR) data further demonstrate that TC degradation is an integrative contribution of both non-radical ( 1 O 2 ) and free radical (O 2 − , SO 4 − , and OH) pathways. Furthermore, Fe 3 O 4 @JDC also exhibits superior reusability (81.1 % degradation efficiency after five cycles) and magnetic separation ability.
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Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Guangshuo Wang,Fangfang Si,Yingying Ma,Yanming Wang,Zhixiao Zhang,Ruitao Yu,Xiaoliang Zhang,Guoqing Chang,Jingbo Mu,Hongwei Che,Ping Li,Dong Li
A kind of novel two-dimensional magnetic nanocomposites were successfully fabricated via the immobilization of Fe 3 O 4 nanoparticles onto the surface of graphitic carbon nitrogen (g-C 3 N 4 ) nanosheets by a facile liquid exfoliated method and subsequent solvothermal reaction. The structural, morphological, compositional, thermal and magnetic characteristics of the as-prepared samples were systematically assessed by employing a wide spectrum of characterization techniques. Subsequently, the as-constructed Fe 3 O 4 /g-C 3 N 4 composites were exploited to fabricate a stable magnetorheological (MR) suspension, and the rheological performances and sedimentation stability of the designed MR fluid were evaluated through a rotational rheometer and a visual observation method, respectively. The experimental results revealed that the established MR fluid demonstrated an obvious enhancement in sedimentation stability in comparison with that of another a kind of suspension containing carbonyl iron particles. The higher sedimentation stability realized in this MR smart system can be associated primarily with the dispersed Fe 3 O 4 /g-C 3 N 4 composite particles with ultrathin sheet-like nanostructure and the reduced density mismatch.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 29
·期 13
·e202203097
·
IF 5.02
Ruixia Yang,Qiaohong Peng,Adeel Ahmed,Fengyuan Gao,Bing Yu,Youqing Shen,Hailin Cong
Graphical MB and PMS are absorbed by the Fe 3 O 4 /C shell and subsequently diffuse into the interior cavity of the yolk-shell Co 3 O 4 @Fe 3 O 4 /C nanocomposites. PMS enter the catalyst and interact with active sites on the shell and in the core. Co 2+ and Fe 2+ in the catalyst can activate PMS to generate SO 4 ⋅ − . Meanwhile, OH − /H 2 O will be oxidized by SO 4 ⋅ − to ⋅OH, generating H + while consuming OH − . SO 4 ⋅ − , ⋅OH and , resulting from a typical chain reaction, will interact with MB and breakdown it to intermediates CO 2 and H 2 O. The yolk-shell Co 3 O 4 @Fe 3 O 4 /C nanocomposites with Co 3 O 4 as the core, Fe 3 O 4 /C as the shell, and a cavity structure were synthesized by the hard template method. The physical and chemical properties of the composites were characterized by SEM, TEM, XRD, TGA, XPS, BET, and VSM. The specific surface area of yolk-shell Co 3 O 4 @Fe 3 O 4 /C nanocomposites is 175.9 m 2 g −1 , showing superparamagnetic properties. The yolk-shell Co 3 O 4 @Fe 3 O 4 /C nanocomposites were used as heterogeneous Fenton catalysts to activate peroxymonosulfate (PMS) to degrade MB, which showed high catalytic degradation performance. The degradation rate of MB reached 100 % within 30 min under the circumstances of the yolk-shell Co 3 O 4 @Fe 3 O 4 /C nanocomposites dosage of 0.1 g L −1 , the PMS dosage of 1.0 g L −1 , the initial MB concentration of 100 mg L −1 , an initial pH of 5.5, and a temperature of 30±2 °C. The enhanced catalytic performance of the yolk-shell Co 3 O 4 @Fe 3 O 4 /C nanocomposites can be attributed to the synergistic effect of the two catalytically active materials and the middle cavity. The effects of different operating parameters and co-existing anion species on MB degradation were also investigated. Electron paramagnetic resonance (EPR) analysis and quenching experiments confirmed that the formation of SO 4 ⋅ − in the yolk-shell Co 3 O 4 @Fe 3 O 4 /C/PMS system contributes to MB degradation. In addition, yolk-shell Co 3 O 4 @Fe 3 O 4 /C nanocomposites can be easily separated from the pollutant solution under the action of an external magnetic field, and the degradation rate of MB can still reach 98 % after five cycles, indicating that it has good stability and reusability and has broad application prospects in the field of water purification.
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