Plasma Processes and Polymers
·
2025
·
IF 2.9
Longwei Li,Xiaoyan Sun,Xiaoyue Sun,Jiahui Kang,Fan Liu
A comb shaped surface dielectric barrier discharge (SDBD) reactor coupled with polyvinylidene fluoride (PVDF)/Fe 3 O 4 composite nanofibers was investigated to degrade methylene blue (MB) in water. The PVDF/Fe 3 O 4 nanofibers with a rough surface were prepared when the proportion of Fe 3 O 4 NPs in a 14 wt% PVDF spinning solution was 7 wt%. Compared to SDBD plasma alone, the addition of PVDF/Fe 3 O 4 nanofibers significantly increased the degradation rate, degradation amount, kinetic constant, energy efficiency, and chemical oxygen demand removal rate of the MB solution. Active species trapping test revealed that •OH played the most important role during MB degradation, •O 2− , H 2 O 2 , electrons, and holes were also crucial. After five repeated uses, the PVDF/Fe 3 O 4 nanofibers maintained high catalytic activity, chemical stability, and mechanical strength.
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BIOCHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 2.892
Juan Han,Li Wang,Yun Wang,Jian Dong,Xu Tang,Liang Ni,Lei Wang
A geometrically symmetric four – arm dendritic polymer 4-arm-PEG-NH 2 was employed to modify on the surface of Fe 3 O 4 as support for cellulase immobilization. Glutaraldehyde was used as a coupling agent of this magnetic support to covalently immobilize cellulase. The morphology and properties of the synthesized magnetic material were characterized by Fourier transform infrared (FT-IR) spectroscopy, vibrating-sample magnetometer (VSM), thermogravimetric analysis (TGA), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The properties of immobilized enzyme such as the optimum temperature and pH, Michaelis constant, thermal stability, reusability and storage stability were investigated. The loading capacity of cellulase was 132 mg/g. Compared with free cellulase, immobilized cellulase showed wider pH and temperature ranges, higher operational stability and good storage stability. Besides, the results of hydrolysis filter paper and microcrystalline cellulose showed that the catalytic effect of immobilized cellulase on the free cellulase was increased by about 76%.
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Journal of Materials Chemistry B
·
2024
·
IF 6.1
Sijie Zhang,Sameer Hussain,Yuhai Tang,Kaili Wang,Xingyan Wang,Long Zhang,Yuheng Liao,Chen Wang,Yi Hao,Ruixia Gao
Nanoagents for chemodynamic therapy (CDT) hold a promising future in the field of antimicrobials, especially copper peroxide (CuO2) (CP) nanomaterials which have garnered significant attention due to their ability to self-supply H2O2. Nevertheless, the poor stability of CuO2 remains a critical challenge which restricts its practical application in the antibacterial field. In this study, an advanced nano-antimicrobial system HA-CP@Fe3O4 with enzyme-responsive properties is developed by coating hyaluronic acid (HA) on CuO2-loaded iron tetraoxide nanoparticles. The coating of HA not only stabilizes the CuO2 nanomaterials but also provides responsiveness towards the enzyme hyaluronidase, which is typically secreted by some bacteria. The outer layer of HA in HA-CP@Fe3O4 undergoes decomposition in the presence of hyaluronidase-secreting bacteria, resulting in the release of CuO2@Fe3O4. The released CuO2@Fe3O4 then self-supplies H2O2 and generates reactive oxygen species (ROS) within the infected microenvironment through Fenton and Russell effects, to ultimately achieve effective and precise antimicrobial activity. Simultaneously, the magnetic property provided by Fe3O4 allows the substance to be directed towards the infection site. Both in vitro and in vivo tests demonstrated that HA-CP@Fe3O4 exhibited excellent antimicrobial capabilities at low concentration (30 μg mL−1), exceptional biocompatibility and the ability to accelerate wound healing. The findings of this work offer a new and promising approach for targeted and precise CDT.
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Food Chemistry-X
·
2024
·
IF 6.5
Hua Zheng,Linlin Feng,Zheng Huang,Ziwei Zou,Xiaolong Ma,Ziping Pan,Jinfeng Li,Jinxia Wu,Mei Li,Zhiheng Su
Aflatoxin B1 (AFB1) is a potent toxin in food, necessitating rapid, instant, and sensitive detection. We have engineered an electrochemical sensor to monitor AFB1 using a system composed of Fe 3 O 4 -NH 4 /AuNPs/apt-S1. The aptamer specifically recognizes AFB1, while ‘S1’ is functionalized with methylene blue to enhance the current. The RecJf exonuclease promotes the formation of the electrochemical strategy. The Fe 3 O 4 component, with its magnet properties, enables a rapid separation of solids and liquids without the need for instrumentation. The sensor exhibits a linear range for AFB1 ranging from 1 ng to 10 μg. The regression equation is I(nA) = 446.8 × logc+2085 (where I and c represent the peak current and AFB1 concentration, respectively). The correlation coefficient is 0.9508, and the detection limit is 3.447 nM. The relative standard deviation of AFB1 in peanut oil ranges from 4.80% to 6.80%. These results demonstrate that the sensor has high sensitivity, stability, repeatability, and specificity for AFB1 detection.
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Journal of Materials Chemistry B
·
2024
·Vol. 12
·期 25
·6164-6174
·
IF 6.1
Lihui Yuwen,Pei Lu,Qi Zhang,Kaili Yang,Zhaowei Yin,Bin Liang,Lianhui Wang
Catalytic therapy based on nanozymes is promising for the treatment of bacterial infections. However, its therapeutic efficacy is usually restricted by the limited amount of hydrogen peroxide and the weak acidic environment in infected tissues. To solve these issues, we prepared polyvinyl alcohol (PVA)–polyacrylic acid (PAA)–iron oxide (Fe3O4)/polyvinyl alcohol (PVA)–zinc peroxide (ZnO2) double-layer electrospun nanofibers (PPF/PZ NFs). In this design, PVA serves as the carrier for ZnO2 nanoparticles (NPs), Fe3O4 NPs, and PAA. The double-layer structure of nanofibers can spatially separate the PAA and ZnO2 to avoid their reaction with each other during preparation and storage, while in the wet wound bed, PVA can dissolve and PAA can provide H+ ions to promote the generation of hydrogen peroxide and subsequent conversion to hydroxyl radicals for bacteria killing. In vitro experimental results demonstrated that PPF/PZ NFs can reduce the methicillin-resistant Staphylococcus aureus by 3.1 log (99.92%). Moreover, PPF/PZ NFs can efficiently treat the bacterial infection in a mouse wound model and promote wound healing with negligible toxicity to animals, indicating their potential use as “plug-and-play” antibacterial wound dressings. This work provides a novel strategy for the construction of double-layer electrospun nanofibers as catalytic wound dressings with hydrogen peroxide/acid self-supplying properties for the efficient treatment of bacterial infections.
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Bioactive Materials
·
2024
·
IF 18
Ying Jin,Hang Liu,Lei Chu,Jin Yang,Xiuyang Li,Hang Zhou,Haitao Jiang,Lei Shi,Jason Weeks,Joshua Rainbolt,Changjiang Yang,Thomas Xue,Haobo Pan,Zhongliang Deng,Chao Xie,Xu Cui,Youliang Ren
Implant-associated Staphylococcus aureus ( S. aureus ) osteomyelitis is a severe challenge in orthopedics. While antibiotic-loaded bone cement is a standardized therapeutic approach for S. aureus osteomyelitis, it falls short in eradicating Staphylococcus abscess communities (SACs) and bacteria within osteocyte-lacuna canalicular network (OLCN) and repairing bone defects. To address limitations, we developed a borosilicate bioactive glass (BSG) combined with ferroferric oxide (Fe 3 O 4 ) magnetic scaffold to enhance antibacterial efficacy and bone repair capabilities. We conducted comprehensive assessments of the osteoinductive, immunomodulatory, antibacterial properties, and thermal response of this scaffold, with or without an alternating magnetic field (AMF). Utilizing a well-established implant-related S. aureus tibial infection rabbit model, we evaluated its antibacterial performance in vivo . RNA transcriptome sequencing demonstrated that BSG + 5%Fe 3 O 4 enhanced the immune response to bacteria and promoted osteogenic differentiation and mineralization of MSCs. Notably, BSG + 5%Fe 3 O 4 upregulated gene expression of NOD-like receptor and TNF pathway in MSCs, alongside increased the expression of osteogenic factors (RUNX2, ALP and OCN) in vitro . Flow cytometry on macrophage exhibited a polarization effect towards M2, accompanied by upregulation of anti-inflammatory genes (TGF-β1 and IL-1Ra) and downregulation of pro-inflammatory genes (IL-6 and IL-1β) among macrophages. In vivo CT imaging revealed the absence of osteolysis and periosteal response in rabbits treated with BSG + 5%Fe 3 O 4 + AMF at 42 days. Histological analysis indicated complete controls of SACs and bacteria within OLCN by day 42, along with new bone formation, signifying effective control of S. aureus osteomyelitis. Further investigations will focus on the in vivo biosafety and biological mechanism of this scaffold within infectious microenvironment.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xiaohan Wang,Jingru Wang,Wenshi Zhao,Rui Guo,Sicheng Cui,Jie Huang,Jiaxin Lu,He Liu,Yang Liu
Tetracycline (TC) is widely distributed in environment and a significant environmental pollutant. It has been challenging to rapidly identify and effectively remove TC contaminants. This work produced a multifunctional Fe 3 O 4 -Cu 2 O-Au-MIPs nanocomposite (FCAu-MIPs NCs) based on molecular imprinting technology for selective SERS detection and photocatalytic degradation of TC. We synthesized FCAu NCs with various Au contents and analyzed the relationship between Au content and SERS performance using finite-difference time-domain (FDTD) technique. Exceptional SERS performance could be attributed to the dense distribution of multiple hotspots on the SERS substrate. The photocatalytic mechanism of FCAu-MIPs NCs towards TC was also discussed. The combination of the narrow-bandgap semiconductor Cu 2 O and noble metal Au with localized surface plasmon resonance (LSPR) effect facilitated efficient light absorption and enhanced charge carrier transfer efficiency. Both SERS detection limits as low as 10 −9 M and selective photocatalytic degradation of TC in soil were achieved. Furthermore, FCAu-MIPs NCs were successfully recovered and reused with assistance of external magnetic field. After six cycles, outstanding SERS and photocatalytic capacities from FCAu-MIPs NCs could still be maintained. The FCAu-MIPs NCs with selective recognition ability to TC should thus hold tremendous applicative possibilities for highly sensitive detection and efficient degradation of TC.
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ENERGY
·
2024
·
IF 9
Bingshuo Li,Aorong Ding,Tianhua Yang,Zhuo Wang,Haijun Zhang,Xingping Kai,Rundong Li
Hydrodeoxygenation (HDO) of phenols has significant potential for the synthesis of cycloalkane. In this study, a Ni-based magnetic molecular sieve catalyst, Ni/HZSM-5@SiO 2 @Fe 3 O 4 , was carefully prepared and systematically characterized using various analytical methods. A screening of the HDO reaction conditions was carried out using a typical phenolic compound of 4-ethylphenol. Under the optimal reaction conditions (240 °C, 3 h) with n-dodecane as the solvent, the 6 % Ni/HZSM-5@SiO 2 @Fe 3 O 4 catalyst showed excellent performance, achieving a 4-ethylphenol conversion of 59.3 % and an ethylcyclohexane selectivity of 85.1 %. In comparison to conventional Ni/HZSM-5, the magnetic micromesoporous molecular sieve catalyst exhibited superior catalytic activity, alkane selectivity and recyclability, with a catalyst recovery ratio of 95 %. Furthermore, the effect of liquid-solid mass transfer efficiency on the ethylcyclohexane selectivity considering of the stirring speed was studied, and the selectivity was increased from 81.6 to 85.1 % when the speed was increased from 400 to 600 rpm. This finding was further substantiated by Fluent numerical simulation. To elucidate the HDO pathway of 4-ethylphenol on Ni/HZSM-5@SiO 2 @Fe 3 O 4 , a comprehensive reaction pathway was proposed, providing insights into the catalytic mechanism.
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MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Siyuan Zhang,Zisen Li,Jinlei Tao,Jian Jiao
Optimizing the composition and structure of polymers and carbon nanomaterials to obtain composite films with excellent mechanical and electromagnetic wave (EMW) properties is an excellent solution for exploring EMW absorbing materials. In this work, a flexible composite film with a regular three-dimensional network structure was designed and prepared. The modified rGO@MWCNTs/Fe 3 O 4 -PVA composite nanofilm with optimized composition and structure has a multi-component heterogeneous interface, three-dimensional network structure. The composite film has high EMW absorption performance, excellent flexibility, mechanical strength and stability, and can be used in a wide range of application scenarios. At a thickness of 2.8 mm, the effective absorption bandwidth ( f E ) reaches 3.72 GHz, the minimum reflection loss (RL min ) is -48.99 dB, and the tensile stress reaches 32 MPa. This work realizes the regulation of the mechanical properties and EMW absorbing properties of the composite film, and provides an efficient and stable flexible composite EMW absorbing material.
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MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Huijie Qin,Tongwei Zhang,Lihong Bao,Bo Dang,Jianxi Li
The high flammability of ethylene vinyl acetate copolymers (EVA) limits its important applications in fire safety, and the addition of highly effective flame retardants can improve this deficiency. Melamine cyanurate (MCA) has limited carbon-forming ability and therefore is often combined with other flame retardants to achieve synergistic flame retardant effects and thus improve the flame retardancy of EVA. Therefore, in this study, MoS 2 @Fe 3 O 4 hybrid materials were synthesized by in-situ growth of molybdenum disulfide (MoS 2 ) and ferric oxide (Fe 3 O 4 ) and their structures were characterized using various techniques. The hybrids were blended with melamine cyanurate (MCA) into ethylene vinyl acetate copolymer (EVA) by melt blending method to reduce the fire hazard. The EVA composites with 1.0 wt% MoS 2 @Fe 3 O 4 blends significantly improved the coke residue and limiting oxygen index values to 22.5 % and 23.2 %, while their peak heat release rate, total heat release, and total smoke release were reduced by 62.5 %, 11.7 %, and 35.3 %, respectively, as compared to pure EVA. The results suggest that the use of MoS 2 @Fe 3 O 4 hybrids in combination with MCA is a promising strategy for the development of advanced flame-retardant materials.
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Materials Research Express
·
2018
·Vol. 5
·期 3
·035510
·
IF 1.151
Wenxia Wang,Qi He,Kaijun Xiao,Liang Zhu
In the study, a two-major step involving a hydrothermal method and an electrostatic self-assembly method was adopted to synthesis Fe3O4/GO nanocomposites. The Fe3O4 nanoparticles were successfully modified with the 3-aminopropyltrimethoxy-silane and homogeneously deposited onto the surface of GO. They were used as Fenton-like catalyst to degrade Rhodamine B and displayed a higher activity compared with the pristine Fe3O4 nanoparticles, H2O2, Fe3O4/GO nanocomposite and Fe3O4/H2O2 system, demonstrating the synergistic effect between the superior adsorption properties of GO and the excellent catalytic activity of Fe3O4/H2O2 system. Besides, the possible catalytic mechanism and degradation pathway for RhB molecules by Fe3O4/GO nanocomposites and H2O2 was proposed based on the liquid chromatography-mass spectrometry (LC-MS) analysis. The result reveals that the •OH radicals should be the main actives species during catalytic degradation of RhB by the Fe3O4/GO/H2O2 system. In addition, the catalyst is reusable and shows efficiency up to 5 cycles. We believe the strategy in our work can provide insight into designing the novel catalysts for large-scale degradation of organic pollutants in the wastewater.
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Nanomaterials
·
2018
·Vol. 8
·期 1
·52
·
IF 3.504
Baokang Dang,Yipeng Chen,Hanwei Wang,Bo Chen,Chunde Jin,Qingfeng Sun
Fe3O4/wood fiber composites are prepared with a green mechanical method using only distilled water as a solvent without any chemical agents, and then a binderless composite board with high mechanical properties is obtained via a hot-press for electromagnetic (EM) absorption. The fibers are connected by hydrogen bonds after being mechanically pretreated, and Fe3O4nanoparticles (NPs) are attached to the fiber surface through physical adsorption. The composite board is bonded by an adhesive, which is provided by the reaction of fiber composition under high temperature and pressure. The Nano-Fe3O4/Fiber (NFF) binderless composite board shows remarkable microwave absorption properties and high mechanical strength. The optional reflection loss (RL) of the as-prepared binderless composite board is −31.90 dB. The bending strength of the NFF binderless composite board is 36.36 MPa with the addition of 6% nano-Fe3O4, the modulus of elasticity (MOE) is 6842.16 MPa, and the internal bond (IB) strength is 0.81 MPa. These results demonstrate that magnetic nanoparticles are deposited in binderless composite board by hot pressing, which is the easiest way to produce high mechanical strength and EM absorbers.Keywords:wood fiber composites;Fe3O4nanoparticles;electromagnetic absorption properties;mechanical properties
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