BIOSENSORS & BIOELECTRONICS
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2016
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IF 7.476
Shuisheng Hu,Wenjun Ouyang,Longhua Guo,Zhenyu Lin,Xiaohua Jiang,Bin Qiu,Guonan Chen
A fluorescent biosensor for ochratoxin A was fabricated on the basis of a new nanocomposite (Fe 3 O 4 /g-C 3 N 4 /HKUST-1 composites). Fe 3 O 4 /g-C 3 N 4 /HKUST-1 was synthesized in this work for the first time, which combined HKUST-1 with g-C 3 N 4 to improve its chemical stability. Fe 3 O 4 /g-C 3 N 4 /HKUST-1 composites have strong adsorption capacity for dye-labeled aptamer and are able to completely quench the fluorescence of the dye through the photoinduced electron transfer (PET) mechanism. In the presence of ochratoxin A (OTA), it can bind with the aptamer with high affinity, causing the releasing of the dye-labeled aptamer from the Fe 3 O 4 /g-C 3 N 4 /HKUST-1 and therefore results in the recovery of fluorescence. The fluorescence intensity of the biosensor has a linear relationship with the OTA concentration in the range of 5.0–160.0 ng/mL. The LOD of sensor is 2.57 ng/mL (S/N=3). This fluorescence sensor based on the Fe 3 O 4 /g-C 3 N 4 /HKUST-1 composites has been applied to detect OTA in corn with satisfying results.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2017
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IF 2.714
Yang Li,Ke Hu,Bo Chen,Yijun Liang,Fengguo Fan,Jianfei Sun,Yu Zhang,Ning Gu
Field-assisted synthesis has been one of the common strategies of nanoparticles preparation with enhanced properties. However, most researches focused on exploring the effects of monofunctional static field on the structure and properties of synthetic nanomaterials, few researchers have applied fields with period variation as assistance. Combining medium alternating current magnetic field with most widely used method traditional chemical co-precipitation held potential in preparation high quality Fe 3 O 4 nanoparticle. In this study, Fe 3 O 4 nanoparticle clusters were prepared in alternating-current magnetic field (ACMF) by co-precipitation principle, structural and magnetic properties were also characterized. Results demonstrated that Fe 3 O 4 nanoparticle clusters prepared by co-precipitation heated in ACMF indicated a better heat production under ACMF, comparing with Fe 3 O 4 nanoparticle clusters with similar size and distribution prepared by classic co-precipitation. It might be due to the magnetic effects induced by ACMF that Fe 3 O 4 nanoparticles tend to grow along the magnetization direction. This technology might hold promise in preparation high performance magnetic nanomaterial in the future.
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WATER AIR AND SOIL POLLUTION
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2016
·Vol. 227
·期 9
·1-13
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IF 1.551
Ma Yulin,Gu Na,Gao Jinlong,Wang Kuitao,Wu Yunxia,Meng Xiaoyu
Fe 3 O 4 -CuO@montmorillonite was prepared using coprecipitation method, and its structure was determined by XRD, IR, and transmission electron micrograph (TEM). Montmorillonite in Fe 3 O 4 -CuO@montmorillonite nanocomposite allowed the silicate layer of montmorillonite to behave as a barrier, which prevented the agglomeration and natural crystallization of Fe 3 O 4 and CuO. Furthermore, the chlorine dioxide (ClO 2 ) oxidative degradation of anthracene-contaminated soil was studied in detail using Fe 3 O 4 -CuO@montmorillonite as a magnetic heterogeneous catalyst. The operating parameters such as ClO 2 concentration, catalyst dosage, reaction time, and pH were evaluated. Compared with the conventional ClO 2 oxidation process without the catalyst, the ClO 2 catalytic oxidation system could significantly enhance the degradation efficiency. Under the optimal condition (anthracene concentration 89.8 mg/kg, water soil mass ratio 3:1, initial pH 7, ClO 2 concentration 1 mol/kg, catalyst dosage 1 g/kg, reaction time 30 min, and reaction temperature 25 °C), anthracene degradation efficiency achieved 96.2 %. The catalyst could be easily reused by magnetic separation and used at least 8 cycles without obvious loss of activity. The kinetic studies revealed that the ClO 2 catalytic oxidation degradation of anthracene-contaminated soil with Fe 3 O 4 -CuO@montmorillonite as catalyst followed pseudo-first-order kinetics with respect to ClO 2 concentration. Thus, this study showed potential application of ClO 2 catalytic oxidation process in remediation of organic pollutant-contaminated soil.
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CATALYSIS TODAY
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2024
·
IF 5.2
Jiabao Sun,Chuanrun Li,Zhigang Lei,Yanyan Guo
In this work, the Fe 3 O 4 @ZIF-8 catalyst was prepared by combining Fe 3 O 4 with ZIF-8 for degrading carbamazepine (CBZ) in water, using activated persulfate (PS) and peroxymonosulfate (PMS). We investigated the optimal catalysts and reaction conditions for using PS or PMS as activators by varying the pH, temperature, catalyst dosage, as well as the dosage of PS and PMS, respectively. The results demonstrated that the CBZ removal rate using Fe 3 O 4 @ZIF-8 reached 98.1 % after 30 min with a mass ratio of Fe 3 O 4 to ZIF-8 = 3:1, temperature = 40°C, catalyst dosage = 0.50 g·L −1 , and PS dosage = 0.25 g·L −1 , using pH = 3.0. Characterization results show due to the fact that the presence of ZIF-8 facilitates the dispersion of the catalytic active species Fe 3 O 4 , prevents the agglomeration of the active species, increases the number of active species, and improves the catalytic performance. Furthermore, radical quenching assay and electron paramagnetic resonance spectra successfully identified the main oxidizing components generated in the system, namely SO 4 • − and •OH.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Jiang Huang,Zhiyang Huang,Guangran Ma,Fugang Xu,Hongliang Tan
Ensuring the reliable and accurate detection of Escherichia coli ( E. coli ) is essential for maintaining food safety and safeguarding human health. In this work, a dual-mode sensor that integrates colorimetric and fluorescence detection was developed for the precise identification of E. coli . Fe 3 O 4 nanoparticles (NPs) were coated with a fluorescein-labeled aptamer (FAM-Apt) to enhance their peroxidase-like activity under neutral pH conditions. Simultaneously, this coating also effectively suppressed the fluorescence emitted by FAM. Upon exposure to E. coli , specific binding of the bacteria causes the detachment of FAM-Apt from the Fe 3 O 4 NPs surface, resulting in the suppression of Fe 3 O 4 NPs catalytic activity under neutral pH and the alleviation of the quenching effect on FAM fluorescence. This leads to a simultaneous decrease in the colorimetric signal and an increase in fluorescence signal, facilitating the development of a dual-mode detection method for E. coli with an impressive limit of detection (LOD) of 10 CFU/mL in the colorimetric mode and 6 CFU/mL in the fluorescence mode. This approach highlights the untapped potential of Fe 3 O 4 NPs as a peroxidase mimic in dual-mode sensors, offering a promising strategy for E. coli detection with significant implications for enhancing food safety and public health practices.
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MATERIALS CHEMISTRY AND PHYSICS
·
2025
·
IF 4.7
Wenjuan Zhang,Hanhong Xu,Yuheng Li,Yaxian Wang,Xiangyue Yang,Youliang Wang,Henan Jia,Yongqian Shen,Wei Zhang,Tomasz Wejrzanowski
With the rapid advancement of digital and communication technologies, electromagnetic pollution poses an increasingly serious threat to the environment and precision instruments. In this study we report a three-dimensional MXene/PPy/Fe 3 O 4 (3D MPF) composite with an ordered three-dimensional network structure constructed by an in-situ self-assembly method. The porous structure of 3D MPF was adjusted to induce the assembly of MXene nanosheets through different EDA additions. The 3D MPF exhibits cross-linked and interpenetrating conductive networks that facilitate efficient electron transfer and reflection. The multi-layer heterogeneous interfaces and functional groups of the 3D MPF generate more polarization defects, causing significant reflection and scattering of incident electromagnetic waves. Moreover, the inclusion of Fe 3 O 4 supports magnetic loss and optimizes the impedance matching of the 3D MPF. The 3D MPF exhibits a maximum reflection loss of −55.21 dB at a thickness of 3.31 mm when the ratio of MXene to Fe 3 O 4 is 1:1. At a thickness of 1.41 mm, the effective absorption bandwidth reaches 3.44 GHz (from 13.84 GHz to 17.28 GHz). By adjusting the matching thickness, the effective absorption bandwidth of the 3D MPF ranges from 3.44 GHz to 18 GHz, with reflection losses below −10 dB, indicating its significant potential in electromagnetic wave absorption.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Fan Wang,Lijuan Zhang,Yeying Wang,Xijian Liu,Sohrab Rohani,Jie Lu
The graphene oxide (GO) functionalized by Fe 3 O 4 @SiO 2 @CS-TETA nanoparticles, Fe 3 O 4 @SiO 2 @CS-TETA-GO, was firstly fabricated in a mild way as a novel adsorbent for the removal of Cu(II) ions and methylene blue (MB) from aqueous solutions. The magnetic composites showed a good dispersity in water and can be conveniently collected for reuse through magnetic separation due to its excellent magnetism. When the Fe 3 O 4 @SiO 2 @CS- TETA-GO was used as an absorbent for the absorption of MB and Cu(II), the adsorption kinetics and isotherms data well fitted the pseudo-second-order model and the Langmuir model, respectively. Under the optimized pH and initial concentration, the maximum adsorption capacity was about 529.1 mg g −1 for MB in 20 min and 324.7 mg g −1 for Cu(II) in 16 min, respectively, exhibiting a better adsorption performance than other GO-based adsorbents reported recently. More importantly, the synthesized adsorbent could be effectively regenerated and repeatedly utilized without significant capacity loss after six times cycles. All the results demonstrated that Fe 3 O 4 @SiO 2 @CS-TETA-GO could be used as an excellent adsorbent for the adsorption of Cu(II) and MB in many fields.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Hua Chai,Ze Zhang,Jie Sun,Mingjun Zhong,Mengxue Liu,Jing Li,Zihao Chen,Beini Gong,Qiaoling Xu,Zhujian Huang,Lihua Cui
This research investigates the synergistic enhancement of semiconductor catalysts through the incorporation of carbon quantum dots (CQDs) within CeO 2 -Fe 3 O 4 Type-II heterojunction photocatalysts. Subsequent to the successful synthesis of these modified photocatalysts, a thorough assessment of their catalytic performance is conducted. Notably, the introduction of CQDs results in a 21% increase in pollutant degradation capacity compared to unmodified heterojunctions, with a remarkable removal efficiency of 96% for the target pollutant TC. Comprehensive analyses employing electrochemical impedance spectroscopy (EIS), UV–vis spectroscopy, and photocatalytic experiments provide substantial evidence for the efficacy of CQDs in enhancing light absorption properties within the CeO 2 -Fe 3 O 4 heterojunction. This enhancement is attributed to a notable suppression of electron-hole pair recombination, facilitating the generation of reactive oxygen species (ROS) such as ·O 2 - and ·OH. This, in turn, the promotion of Ce 4+ /Ce 3+ and Fe 3+ /Fe 2+ cycles takes place, collectively enhancing the responsiveness of the photocatalyst to visible light. The photocatalysts demonstrate enduring catalytic and magnetic stability over five cycles, as indicated by the sustained high-performance retention. Detailed analysis using TOF-LC-MS has revealed two highly efficient degradation pathways for the for the target pollutant. The findings contribute valuable insights for advancing the performance of heterojunction photocatalysts.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2025
·
IF 9.8
Xiaoxuan Tan,Yang He,Chunhong Wang,Yu Zhang,Wenshu Wang,Hanyu Li,Rongrong Yu
The proliferation of electronic devices has made electromagnetic interference (EMI) shielding increasingly critical for both device performance and human health protection. Here, we demonstrate a hierarchical composite film that achieves exceptional EMI shielding through the synergistic integration of magnetic nanofibers and MXene nanosheets. By combining electrospinning and layer-by-layer assembly, we fabricate a composite structure where Fe 3 O 4 -loaded cellulose/PAN nanofibers alternate with Ti 3 C 2 T x MXene layers, creating multiple heterogeneous interfaces for enhanced electromagnetic wave attenuation. The engineered architecture promotes multiple electromagnetic loss mechanisms through interface polarization, magnetic losses, and multiple internal reflections. The optimized composite exhibits remarkable performance metrics: achieving a thickness-specific shielding efficiency of 118 dB/mm at just 0.18 mm thickness, significantly surpassing current commercial standards. At 0.64 mm thickness, the electromagnetic shielding effectiveness reaches 33.2 dB, effectively blocking over 99.9 % of electromagnetic radiation. Notably, the composite demonstrates exceptional mechanical durability, retaining 96.8 % of its shielding effectiveness after 300 bending cycles. The integration of renewable cellulose and magnetic components with highly conductive MXene not only enhances electromagnetic wave attenuation but also promotes environmental sustainability. This combination of ultra-thin profile, superior shielding performance, and mechanical flexibility, coupled with eco-friendly material selection, provides a promising pathway for EMI protection.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yuyao Li,Pei Wang,Yifan Liu,Xuefei Wu,Guangning Long,Yi Chen,Jiyan Wang,Fei Tong,Xiaolei Wang
Periodontitis, a chronic inflammatory oral disease resulting from plaque biofilms, affects about 743 million individuals worldwide. However, the efficacy of current treatments is hampered by challenges in delivering antibiotics to recalcitrant oral biofilms and bacterial resistance, thereby impeding successful treatment of infectious diseases. To address the issues, an antibacterial photothermal material was designed, comprising a spherical structure of zinc oxide (ZnO) wrapped with triiron tetraoxide (Fe3O4). The outer layer of the material adsorbed epsilon-polylysine (EPL) by electrostatic action, ultimately leading to the fabrication of Fe3O4/ZnO/EPL nanoparticles (FZE NPs). The Fe3O4 core endowed the nanoparticles with efficient photothermal properties, facilitating the dispersion of dense biofilms, which dramatically promoted the adsorption and penetration of ZnO and EPL into the biofilms to effectively kill bacteria in biofilms in vitro with enhanced sterilization ability. Additionally, upon dissolution in aqueous media, EPL acts as a positively charged antimicrobial peptide that adsorbs onto the surface of negatively charged bacterial membranes, thereby effectively modulating inflammatory responses. In order to ascertain the efficacy of FZE NPs, an investigation was conducted into their antimicrobial effects against the periodontitis-associated pathogen Porphyromonas gingivalis (P. gingivalis) in vitro. Furthermore, the antiperiodontitis potential of FZE NPs was evaluated in Sprague–Dawley (SD) rats of ligamentous periodontitis. In addition, toxicity evaluations indicated that the material had an acceptable biosafety profile in vitro and in vivo. In summary, the nanospheres (FZE NPs) represent a promising therapeutic strategy for the treatment of periodontitis.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Xiaofei Ren,Yubo Wang,Guicong Hu,Qingbin Guo,Dengzheng Gao,Peng Huang,Wenbing Zhang,Li Wang,Xiaolong Hu
In this study, Fe 3 O 4 /sepiolite composites as peroxymonosulfate (PMS) catalysts were successfully synthesized via a simple water bath method for tetracycline (TC) degradation. The results indicated that the composite with 70% Fe 3 O 4 loading amount exhibited the highest TC degradation efficiency (90.12%), and its reaction rate constant (0.02193 min −1 ) was around 2.07 times higher than that of pure Fe 3 O 4 . The enhanced catalytic activity was mainly attributed to the uniform deposition of Fe 3 O 4 nanoparticles with smaller grain size (17.24 nm) on sepiolite , leading to the larger specific surface area (120.61 m 2 /g) and more exposed reaction active sites. The electron paramagnetic resonance (EPR) and quenching experiments displayed that 1 O 2 species played the predominant roles in TC degradation process. Besides, potential catalytic mechanisms and degradation pathways of TC were proposed. The toxicity of TC was reduced during the degradation process. Overall, this work can provide a new strategy for the rational design of promising mineral-based PMS catalyst for the wastewater treatment .
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Chen Chen,Zeming Yan,Zhuoli Ma,Dianjie Ma,Shijun Xing,Wenping Li,Jiazhi Yang,Qiaofeng Han
The pollution especially organic dyes pollution of water resources is an urgent issue to be solved. It is crucial to develop highly efficient, low cost and recyclable heterogeneous catalysts for wastewater treatment. In this study, a heterogeneous Fenton catalyst loaded with Fe 3 O 4 nanoparticles was prepared by one step pyrolysis using natural crop waste corncob as carbon source. The prepared porous carbon catalyst can effectively degrade methyl orange (MO, 25 mg·L −1 ) at room temperature, and the degradation rate is 99.7%. In addition to high catalytic degradation activity, the layered porous carbon structure of the catalyst also provides high stability and reusability. The degradation rate can be maintained above 93% after 10 cycles. Furthermore, the prepared catalyst is magnetic, which makes the catalyst easy to recycle in practical applications. In addition, the prepared Fe 3 O 4 /RCC catalyst has efficient Fenton degradation activity for bisphenol A (BPA) (96.9%) and antibiotic tetracycline hydrochloride (TC-HCl) (95.5%), which proves that it has universal applicability for the degradation of most organic pollutants. This study provides a feasible and scalable strategy to prepare a heterogeneous Fenton catalyst treating wastewater and high-value utilization of biomass waste.
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