Materials Research Express
·
2018
·Vol. 5
·期 2
·025304
·
IF 1.151
Lingfeng Yang,Haopeng Cai,Bin Zhang,Siqi Huo,Xi Chen
Novel electromagnetic functionalized carbon nanofibers (CNFs) have been synthesized by coating with Fe3O4 magnetite nanoparticles and conducting polymers polyaniline (PANI) on CNFs through a layer by layer assembly. The Fe3O4@CNFs were first prepared by coating nano-Fe3O4 particles on CNFs via co-precipitation method; Then the PANI was coated on Fe3O4@CNFs using an in situ polymerization process to obtain PANI@Fe3O4@CNFs nanoparticles. The prepared PANI@Fe3O4@CNFs nanoparticles were dispersed in the epoxy matrix to fabricate microwave absorbing nanocomposites. Compared with the Fe3O4@CNFs/epoxy nanocomposites, the PANI@Fe3O4@CNFs/epoxy nanocomposites exhibit better microwave absorbing properties. The composite containing 15 wt% of PANI@Fe3O4@CNFs with the thickness of 2 mm showed a minimum reflection loss (RL) value of −23.7 dB with an effective absorption bandwidth which is about 3.7 GHz (11.9–15.6 GHz) in the frequency range of 1–18 GHz, indicating that it is an attractive candidate for efficient microwave absorber. A potential absorption mechanism was proposed for enhancement of the impedance-matching condition and electromagnetic wave-attenuation characteristic of materials. Specifically, the impedance-matching condition was improved by the combination of conductive polymers and magnetic nanoparticles with CNFs. The electromagnetic wave attenuation characteristic was enhanced by multiple reflections, due to the increased propagation paths.
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Toxics
·
2024
·Vol. 12
·期 1
·40
·
IF 3.9
Aihua Li,Chaofei Wang,Chengjiang Qian,Jinfeng Wen,He Guo
Chemical wastewater has a high concentration of toxic and hazardous antibiotic pollutants, which not only devastates the ecological environment and disrupts the ecological balance, but also endangers human health. This research proposed a non-thermal plasma (NTP) combined with a ZnO-Fe3O4nano-catalyst system to achieve the efficient degradation of ciprofloxacin (CIP) in chemical wastewater. Firstly, ZnO-Fe3O4composite materials were prepared using hydrothermal method and characterized with scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), etc. With the sole NTP, NTP/ZnO, and NTP/ZnO-Fe3O4systems, the removal efficiency of CIP can reach 80.1%, 88.2%, and 99.6%, respectively. The optimal doping amount of Fe3O4is 14%. Secondly, the capture agent experiment verified that ·OH, ·O2−, and1O2all have a certain effect on CIP degradation. Then, liquid chromatography–mass spectrometry (LC-MS) was used to detect the intermediate and speculate its degradation pathway, which mainly included hydroxyl addition, hydroxyl substitution, and piperazine ring destruction. After treatment with the NTP/ZnO-Fe3O4system, the overall toxicity of the product was reduced. Finally, a cyclic experiment was conducted, and it was found that the prepared ZnO-Fe3O4catalyst has good reusability. The NTP/ZnO-Fe3O4was also applied in practical pharmaceutical wastewater treatment and has practical applicability.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Huanyu Zhuang,Xiaoyu Li,Xin Du
Bacterial infections represent one of the foremost threats to global human health. Furthermore, the misuse of antibiotics has exacerbated the public health crisis. Therefore, the development of high-performance novel antibacterial materials is of utmost importance. However, there are still several issues regarding the antibacterial performance and recyclability of existing antibacterial materials. To address these issues, this study synthesized a core@shell@shell@satellite structured Fe 3 O 4 @SiO 2 @polydopamine (PDA)@tannic acid (TA)@Ag nanocomposite, aiming to achieve excellent photothermal effect and synergistic antibacterial activity with silver. The composite particles exhibited improved dispersibility due to the SiO 2 coating. The modification of TA on the Fe 3 O 4 @SiO 2 @PDA achieved the uniform loading of silver nanoparticles (NPs), which significantly enhanced the photothermal conversion efficiency (η) of up to 74.9 %. Additionally, the superparamagnetic property facilitated magnetic separation, ensuring the efficient recovery and reutilization of the nanocomposites. Under low concentration and low-power near-infrared (NIR) light irradiation (808 nm, 1.0 W cm −2 ), the nanocomposite demonstrated excellent synergistic antibacterial activity, achieving efficient eradication of Escherichia coli (100 %) and Staphylococcus aureus (98 %). Furthermore, the material could be recycled up to five times without significant loss of antibacterial activity. Overall, our approach demonstrates the potential of novel multifunctional composite NPs in the treatment of bacterial infections and the sustainable application of antibacterial agents.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Shengmei Tai,Hui Cao,Yingkang Cui,Chifang Peng,Jianguo Xu,Zhouping Wang
Pesticide detection based on nanozyme is largely limited in terms of the variety of pesticides. Herein, a spherical and well-dispersed Fe 3 O 4 /graphene oxide nanoribbons (Fe 3 O 4 /GONRs) composite nanozyme was applied to firstly develop an enzyme-free and sensitive colorimetric and fluorescence dual-mode detection of thiophanate-methyl (TM). The synthesized Fe 3 O 4 /GONRs possess excellent dual enzyme-like activities (peroxidase and catalase) and can catalyze H 2 O 2 to oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) into oxidized TMB (oxTMB). We found that Fe 3 O 4 /GONRs can adsorb TM through the synergistic effect of multiple forces, thereby inhibiting the catalytic activities of nanozyme. This inhibition can modulate the transformation of TMB to oxTMB, producing dual responses of absorbance decrease (oxTMB) and fluorescence enhancement (TMB). The limits of detection (LODs) of TM were 28.1 ng/mL (colorimetric) and 8.81 ng/mL (fluorescence), respectively. Moreover, the developed method with the recoveries of 94.8–100.8% also exhibited a good potential application in the detection of pesticides residues in water and food samples.
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Pharmaceutics
·
2024
·Vol. 16
·期 5
·639
·
IF 4.9
Junming Cui,Xinxi Cai,Rui Qian,Lin Wu,Xueyong Qi,Jin Cao,Song Shen
Artemisinin has an endoperoxide bridge structure, which can be cleaved by ferrous ions to generate various carbonyl radicals in an oxygen-independent manner, highlighting its potential for treating hypoxic tumors. In our study, we fabricated Tween 80 micelles loaded with Fe3O4nanoparticles and artemisinin for cancer therapy. The synthesized Fe3O4nanoparticles and drug-loaded micelles have particle sizes of about 5 nm and 80 nm, respectively, both exhibiting excellent dispersibility and stability. After uptake by MCF-7 cells, drug-loaded micelles release Fe2+and ART into the cytoplasm, effectively inducing the generation of reactive oxygen species (ROS) in hypoxic conditions, thereby enhancing toxicity against cancer cells. In vitro and in vivo studies have demonstrated that ART and Fe3O4nanoparticles are encapsulated in Tween 80 to form micelles, which effectively prevent premature release during circulation in the body. Although free ART and Fe3O4nanoparticles can inhibit tumor growth, TW80-Fe3O4-ART micelles demonstrate a more pronounced inhibitory effect, with a tumor suppression rate of up to 85%. A novel strategy based on artemisinin and ferroptosis is thus offered, holding a favorable prospect for hypoxic cancer therapy.
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DESALINATION
·
2025
·
IF 9.8
Congcong Zhou,Zhihao Chen,Jingfen Yuan,Yang Jiao,Hongjun Lin,Yanchao Xu
Nanofiltration (NF) membranes are widely used in water treatment and molecular separations, but conventional thin-film composite (TFC) membranes often face a trade-off between permeability and selectivity. Incorporating nanomaterials has shown potential to overcome this limitation, though challenges remain in achieving effective nanoparticle distribution. In this study, a magnetic-field-assisted strategy was developed to fabricate high-performance thin-film nanocomposite (M-TFN) membranes. Hydrophilic Fe 3 O 4 nanoparticles were introduced into the aqueous piperazine phase, and an external magnetic field was applied during interfacial polymerization to direct nanoparticle migration toward the membrane surface. This approach yielded a wrinkled polyamide layer with enhanced surface roughness, reduced thickness, and improved hydrophilicity. The resulting M-TFN membrane exhibited a 2.7-fold increase in water permeability (15.9 L·m −2 ·h −1 ·bar −1 ) compared to the conventional TFC membrane, while maintaining high Na 2 SO 4 rejection (>98 %). It also demonstrated efficient rejection of various dyes, following a molecular weight-dependent size-exclusion mechanism. This work provides a promising route for the design of next-generation NF membranes with simultaneously enhanced flux and selectivity.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Lijun Wang,Jing Cao,Zhenni Yu,Haixia Hu,Xiao Yang,Xianggui Chen
The newly established lower maximum residue limit (MRL) for thiamethoxam (TMX) necessitates the development of more sensitive detection methods. This study presents a novel colorimetric-fluorescence sensing platform to detect TMX through graphene quantum dot (GQD)-mediated regulation of Fe 3 O 4 @Cu@PLL nanozyme activity. The mechanism investigation revealed that GQDs effectively suppress the peroxidase-like activity of Fe 3 O 4 @Cu@PLL by reducing and scavenging hydroxyl radicals (•OH) generated during catalytic reactions, which constitutes the fundamental principle of the dual-mode detection strategy. The sensing system was constructed through the hybridization of aptamer-functionalized Fe 3 O 4 @Cu@PLL (Fe 3 O 4 @Cu@PLL/Apt) with complementary DNA strand-modified GQDs (CS-GQDs), forming Fe 3 O 4 @Cu@PLL/Apt-CS/GQDs complexes. Following magnetic separation, two distinct detection channels were established: (1) The supernatant showed negligible fluorescence due to CS-GQDs removal, while (2) the precipitates exhibited suppressed peroxidase-like activity owing to GQD-induced inhibition. However, TMX presence triggered the dissociation of CS-GQDs from the complexes through competitive binding with the aptamer. This resulted in two measurable signals: a fluorescence signal recovery at 450 nm in the supernatant containing CS-GQDs, and restored nanozyme activity in the Fe 3 O 4 @Cu@PLL/Apt+TMX precipitates that catalyzed H 2 O 2 -mediated oxidation of TMB to blue-colored oxTMB. The optimized system achieved detection limits of 8 ng/mL (colorimetric) and 6 ng/mL (fluorescence), demonstrating high sensitivity. Validation experiments using three spiked samples (tea, beans, and kumquats) showed satisfactory recoveries ranging from 94.59 % to 108.23 %, confirming the method's reliability for accurate, on-site TMX detection in food matrices.
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JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Xiupei Yang,Xin Zhou,Qingying Wang,Qiang Yang,Jiayu Wang,Lianfang Chen
The widespread use of fluoroquinolone antibiotics (FQs) in medical and agricultural applications has raised significant environmental and food safety concerns, necessitating the development of sensitive and reliable detection methods. This study presents an advanced analytical approach combining a novel hierarchical magnetic Metal organic framework@Covalent organic framework (MOF@COF) composite materials, named Fe 3 O 4 @NH₂-MIL-88(Fe)@TpBD (Fe 3 O 4 @MOF@COFs), with high-performance liquid chromatography-ultraviolet detection (HPLC-UV) for trace-level FQ determination. The composite was synthesized via a solvothermal method featuring in situ growth of covalent organic frameworks (COFs) on magnetic metal‒organic frameworks (MOFs) and exhibited exceptional performance in magnetic solid‒phase extraction (MSPE) of three target FQs (enrofloxacin, ciprofloxacin, and norfloxacin). The method achieved outstanding sensitivity (0.23–0.27 ng mL⁻¹), a wide linear range (0.70–1000 ng mL⁻¹), strong correlation (R² = 0.9996), and excellent repeatability (1.6–3.8 % RSD). Successful applications in tap water and chicken samples demonstrated recoveries of 85.8–112.2 %, whereas adsorption studies using pseudo-first-order, pseudo-second-order, Langmuir, and Freundlich models provided mechanistic insights into the extraction process. This work has the following advantages: (1) a graded magnetic adsorbent with good extraction efficiency was designed through the synergistic effect of MOF-COF, (2) a robust detection scheme with convenient and fast performance was established, and (3) the adsorption mechanism of recyclable materials was elucidated, thereby demonstrating excellent practical utilization. In summary, this MOF@COFs-MSPE-HPLC-UV method provides a sensitive, efficient, and sustainable solution for monitoring trace FQ pollutants in complex matrices, which is expected to promote the development of the environment and food safety.
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JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Xinyang Liu,Jiarui Chen,Wenbo Ji,Longyi Lv,Duoying Zhang
Bisphenol A (BPA) severely inhibits anaerobic digestion (AD), reducing treatment efficiency and methanogenesis. Critically, this work establishes the first evidence of Fe₃O₄ NPs conferring BPA resilience via synergistic adsorption-bioaugmentation—an unreported mechanism in AD systems. This study demonstrates that Fe₃O₄ nanoparticles (NPs) mitigate BPA inhibition in anaerobic granular sludge (AnGS) systems. Electrochemical characterization confirmed enhanced capacitance and redox reversibility in Fe₃O₄-doped AnGS. The modified system achieved significant performance improvements: 24.4 % higher chemical oxygen demand removal, 31.8 % increased methane production, and enhanced extracellular polymeric substance stability versus control. Microbial analysis revealed enriched hydrolytic bacteria and methanogens, alongside elevated metabolite production. Mechanistically, Fe₃O₄ NPs function through: (1) adsorbing BPA, reducing its bioavailability, and (2) enhancing direct interspecies electron transfer (DIET) by serving as electron conduits, accelerating BPA degradation. This dual-action model—combining adsorption and DIET enhancement—effectively strengthens system resilience against BPA shock loads, providing a validated strategy for maintaining AD performance under toxicant stress.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Xubin Yang,Fei Zhong,Yingqing Zhan,Xin Zhang,Xinyu Bai,Jiawei Liu,Xulin Yang
The inherent flammability of epoxy resins (EP) limits their application in safety-critical areas. This study proposes a structurally ordered and synergistically flame-retardant strategy to address this issue. Initially, polydopamine (PDA) serves as a functional bridging layer to facilitate uniform deposition of Fe 3 O 4 nanoparticles onto boron nitride (BN) nanosheets, constructing a magnetically responsive interface. Subsequently, adenosine triphosphate (ATP) is introduced through copolymerization to form a novel composite flame retardant BN-Fe 3 O 4 @PATP (PATP is a copolymer of polydopamine and adenosine triphosphate). Under magnetic field induction, the BN loaded with Fe 3 O 4 nanoparticles achieves directional alignment within the epoxy resin matrix, forming an efficient physical thermal barrier. Simultaneously, the transition metal oxide Fe 3 O 4 can enhance the formation of residual charcoal. Furthermore, the acid source (phosphate groups), carbon source (polyhydroxy compounds), and gas source (amino groups) within ATP structure can generate an expanded char layer at high temperatures, thus improving its thermal shielding performance. Experimental results demonstrated significantly enhanced flame retardancy of the BN-Fe 3 O 4 @PATP/EP composite system compared to pure EP: peak heat release rate (PHRR), total heat release rate (THR), peak smoke release rate (PSPR), and total smoke release rate (TSR) were reduced by 39.8 %, 24.8 %, 36.8 %, and 44.3 %, respectively. Compared with pure epoxy and other epoxy composites, BN-Fe 3 O 4 @PATP/EP system also exhibits the lowest peak carbon monoxide (PCOPR) and carbon dioxide (PCO 2 PR) evolution rates, while the char residue rises significantly from 14.6 % (pure EP) to 28.8 %. By achieving magnetic field-induced ordered arrangement of BN combined with catalytic char-forming effect and intumescent flame-retardant mechanism, this work constructs a multifunctional flame-retardant system endowed with thermal insulation, smoke suppression, and toxicity reduction capabilities, providing a new strategy for the flame retardancy of EP.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-12
·
IF 4.259
Han Shuwen,Yu Hemin,Yang Tingting,Wang Shengsen,Wang Xiaozhi
Magnetic attapulgite-Fe 3 O 4 nanocomposites (ATP-Fe 3 O 4 ) were prepared by coprecipitation of Fe 3 O 4 on ATP. The composites were characterized by scanning electron microscopey, X-ray diffractometry, Brunauer-Emmett-Teller analysis, X-ray photoelectron spectroscopy, energy dispersive spectrometer and transmission electron microscopy. Surface characterization showed that Fe 3 O 4 particles with an average size of approximately 15 nm were successfully embedded in matrix of ATP. The capacity of the Fe 3 O 4 -activated ATP (A-ATP@Fe 3 O 4 ) composites for catalytic degradation of ethidium bromide (EtBr, 80 mg/L) at different pH values, hydrogen peroxide (H 2 O 2 ) concentrations, temperatures, and catalyst dosages was investigated. EtBr degradation kinetics studies indicated that the pseudo-first-order kinetic constant was 2.445 min −1 at T = 323 K and pH 2.0 with 30 mM H 2 O 2 , and 1.5 g/L of A-ATP@Fe 3 O 4 . Moreover, a regeneration study suggested that A-ATP@Fe 3 O 4 maintained over 80% of its maximal EtBr degradation ability after five successive cycles. The effects of the iron concentrations and free radical scavengers on EtBr degradation were studied to reveal possible catalytic mechanisms of the A-ATP@Fe 3 O 4 nanocomposites. Electron Paramagnetic Resonance revealed both hydroxyl (∙OH) and superoxide anion (∙O 2
− ) radicals were involved in EtBr degradation. Radical scavenging experiment suggested EtBr degradation was mainly ascribed to ∙OH radicals, which was generated by reaction between Fe 2+ and H 2 O 2 on the surface of A-ATP@Fe 3 O 4 .
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Science China-Chemistry
·
2019
·Vol. 62
·期 7
·889-896
·
IF 6.085
Wang Zhaolei,Jiang Xue,Liu Wenbin,Lu Guolin,Huang Xiaoyu
A new kind of bifunctional magnetic-fluorescent nanoparticles (NPs) with abundant carboxyls on the surface has been prepared by covalently combining glutathiose (GSH)-modified CdTe quantum dots (QDs) with Fe 3 O 4 @SiO 2 NPs. The silica-coated Fe 3 O 4 NPs were functionalized with amino groups by (3-aminopropyl)triethoxysilane to provide Fe 3 O 4 @SiO 2 -NH 2 NPs, which was then chemically conjugated with GSH-modified CdTe QDs to form bifunctional magnetic-fluorescent NPs, Fe 3 O 4 @SiO 2 -NH-CO-CdTe-QDs NPs. The properties and morphologies of Fe 3 O 4 @SiO 2 -NH-CO-CdTe-QDs NPs were investigated by FTIR, Xray diffraction, transmission electron microscopy (TEM), absorption and fluorescence spectroscopy and vibrating sample magnetometry. TEM images display that Fe 3 O 4 @SiO 2 -NH-CO-CdTe-QDs NPs possess spherical core-shell structure with a uniform size about 50 nm. The bifunctional NPs were found to exhibit good magnetic and strong fluorescent properties favorable for their application in the detection of latent fingerprints. Furthermore, the carboxyls on the surface of NPs have good absorptions with water in air and the residues of fingerprints so as to not only avoid dust flying to protect the health of operators, but also improve the efficiency of detection.
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危险品化学品经营许可证（带存储）