Journal of Environmental Sciences
·
2018
·
IF 3.12
Yongpeng Ma,Bailong Mu,Xiaojing Zhang,Hongzhong Zhang,Haomiao Xu,Zan Qu,Li Gao
Hierarchical Ag-SiO 2 @Fe 3 O 4 magnetic composites were selected for elemental mercury (Hg 0 ) removal from non-ferrous metal smelting flue gas in this study. Results showed that the hierarchical Ag-SiO 2 @Fe 3 O 4 magnetic composites had favorable Hg 0 removal ability at low temperature. Moreover, the adsorption capacity of hierarchical magnetic composite is much larger than that of pure Fe 3 O 4 and SiO 2 @Fe 3 O 4 . The Hg 0 removal efficiency reached the highest value as approximately 92% under the reaction temperature of 150°C, while the removal efficiency sharply reduced in the absence of O 2 . The characterization results indicated that Ag nanoparticles grew on the surface of SiO 2 @Fe 3 O 4 support. The large surface area of SiO 2 supplied efficient reaction room for Hg and Ag atoms. Ag–Hg amalgam is generated on the surface of the composites. In addition, this magnetic material could be easily separated from fly ashes when adopted for treating real flue gas, and the spent materials could be regenerated using a simple thermal-desorption method.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2024
·Vol. 18
·期 2
·1-13
·
IF 4.3
Zhang Feng,Xu Shuainan,Geng Xiumei,Shan Meixia,Zhang Yatao
Polymers of intrinsic microporosity shows great potential for dye adsorption and magnetic Fe 3 O 4 are easy to be separated. In this work, hydrolyzed polymers of intrinsic microporosity-1/Fe 3 O 4 composite adsorbents were prepared by phase inversion and hydrolysis process for cationic dye adsorption. The chemical structure and morphology of the composite adsorbents were systematically characterized by several characterization methods. Using methylene blue as the target dye, the influences of solution pH, contact time, initial dye concentration, and system temperature on the methylene blue adsorption process were investigated. The incorporation of Fe 3 O 4 particle into hydrolyzed polymers of intrinsic microporosity-1 endow the adsorbent with high magnetic saturation (20.7 emu·g −1 ) which allows the rapid separation of the adsorbent. Furthermore, the adsorption process was simulated by adsorption kinetics, isotherms and thermodynamics to gain insight onto the intrinsic adsorption mechanism. In addition, the composite adsorbents are able to selectively adsorb cationic dyes from mixed dyes solution. Hydrolyzed polymers of intrinsic microporosity/Fe 3 O 4 shows only a slight decrease for methylene blue adsorption after 10 adsorption/regeneration cycles, demonstrating the outstanding regeneration performance. The high adsorption capacity, outstanding regeneration ability, together with simple preparation method, endow the composite adsorbents great potential for selective removal of cationic dyes in wastewater system.
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Journal of Anesthesia
·
2024
·Vol. 38
·期 2
·232-243
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IF 2.8
Zheng Ling-xi,Yu Qian,Li Qiang,Zheng Chuan-dong
Purpose Lidocaine microspheres can prolong the analgesic time to 24–48 h, which still cannot meet the need of postoperative analgesia lasting more than 3 days. Therefore, we added Fe 3 O 4 to the lidocaine microspheres and used an applied magnetic field to attract Fe 3 O 4 to fix the microspheres around the target nerves, reducing the diffusion of magnetic lidocaine microspheres to the surrounding tissues and prolonging the analgesic time. Methods Fe 3 O 4 –lidocaine–PLGA microspheres were prepared by the complex-emulsion volatilization method to characterize and study the release properties in vitro. The neural anchoring properties and in vivo morphology of the drug were obtained by magnetic resonance imaging. The nerve blocking effect and analgesic effect of magnetic lidocaine microspheres were evaluated by animal experiments. Results The mean diameter of magnetically responsive lidocaine microspheres: 9.04 ± 3.23 μm. The encapsulation and drug loading of the microspheres were 46.18 ± 3.26% and 6.02 ± 1.87%, respectively. Magnetic resonance imaging showed good imaging of Fe 3 O 4 –Lidocain–PLGA microspheres, a drug-carrying model that slowed down the diffusion of the microspheres in the presence of an applied magnetic field. Animal experiments demonstrated that this preparation had a significantly prolonged nerve block, analgesic effect, and a nerve anchoring function. Conclusion Magnetically responsive lidocaine microspheres can prolong analgesia by slowly releasing lidocaine, which can be immobilized around the nerve by a magnetic field on the body surface, avoiding premature diffusion of the microspheres to surrounding tissues and improving drug targeting.
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高影响因子
ANALYTICAL BIOCHEMISTRY
·
2015
·
IF 2.219
Chunxiang Zhang,Guangyu Shen,Youming Shen,Xiangyang Zhang
In this work, a novel thiol aromatic aldehyde was synthesized. It can be used as a substrate to directly immobilize antibodies on a gold electrode, for which no additional chemical cross-linker is required. It was also applied as a linker to prepare Fe 3 O 4 @Au/PAMAM/Ab 2 –horseradish peroxidase bioconjugates , which introduced multiple enzymes onto a sensing interface owing to the high surface-to-volume ratio of Fe 3 O 4 @Au nanoparticles and many functional groups of the poly(amidoamine) dendrimer (PAMAM). The introduced multiple enzymes greatly improved the detection signal. Under optimal conditions, the proposed electrochemical immunosensor exhibited desirable performance for detection of IgG in the range 0.005–50 ng ml −1 with a detection limit of 3 pg ml −1 based on a signal-to-noise ratio of 3. It has great potential application in the area of clinical analysis.
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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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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Heshun Jing,Qingtai Xie,Huijuan Su,Yuqi Zhai,Xun Sun,Baorong Duan,Lijun Zhao,Miao Zhang,Caixia Qi,Libo Sun
The research and progress of noble metal catalysts possessing good stability and extended service life holds significant importance in enhancing catalytic efficiency, reducing enterprise costs, and fostering sustainable social development. Here, a hollow magnetic h-Au/PDA@PDA@Fe 3 O 4 catalyst with a double-layer PDA structure was prepared to optimize the stability of gold nanoparticles (NPs) using for the 4-nitrophenol (4-NP) reduction. The research indicates that, despite the initial activity of h-Au/PDA@PDA@Fe 3 O 4 , with a mass-normalized rate ( k’ ) of 176.10 s −1 ·g Au -1 and a Turn Over Frequency (TOF) of 1757 h −1 , being smaller than h-Au/PDA@Fe 3 O 4 with a single-layer structure ( k’ = 461.76 s −1 ·g Au -1 , TOF = 6387 h −1 ), h-Au/PDA@PDA@Fe 3 O 4 exhibits significantly superior stability compared to h-Au/PDA@Fe 3 O 4 . After undergoing 12 cycles of use, the conversion rate of h-Au/PDA@PDA@Fe 3 O 4 decreased by only 4.3 %. After cyclic reaction, the conversion rate of h-Au/PDA@Fe 3 O 4 decreased by as much as 64.8 %. The distinctive hollow double-layer structure of h-Au/PDA@PDA@Fe 3 O 4 , along with the interaction between Au and PDA, contributes significantly to its exceptional activity and stability. The research presented in this paper offers valuable insights and guidance for the suitable construction and industrial application of gold-based nano catalyst with good activity and cyclic stability.
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高影响因子
RSC Advances
·
2025
·Vol. 15
·期 13
·10310-10318
·
IF 4.6
Rui Wu,Xi Song,Yulin Wang,Qiang Zhang
Considering that pesticide residues cause significant harm to health and the environment, it is crucial and urgent to fabricate surface-enhanced Raman scattering (SERS) substrates with high sensitivity to detect pesticide residues. In this study, a three-layer structure of multifunctional Fe3O4/GO/Ag nanoparticles (NPs) as an active substrate for SERS was fabricated and comprehensively characterized through X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), elemental mapping, and X-ray photoelectron spectroscopy (XPS). The active substrate was used to detect thiram pesticide through SERS. Combined with the synergistic effect, Ag NPs and graphene oxide (GO) possessed high-density and ordered hot spots to enhance the electromagnetic field; therefore, signal amplification and fascinating sensitivity were achieved. The lowest concentration of thiram for clear presentation of the peak was 10−12 mol L−1. There was a satisfactory linear relationship, ranging from 10−10 to 10−4 mol L−1, with a low limit of detection, high sensitivity, satisfactory enhancement factor (EF), stability, and repeatability. In addition, Fe3O4/GO/Ag was successfully applied to identify pesticide residues in a practical sample. Furthermore, the enhancement mechanism, including electromagnetic enhancement and chemical reinforcement, is discussed in detail. Fe3O4/GO/Ag is a potential active substrate for SERS and can be applied for rapid detection in the food industry, environmental fields and biomedicine with fascinating sensitivity.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Hongwei Zhang,Jiazhe Cheng,Kaiyu Liu,Shou-xiang Jiang,Jichao Zhang,Qian Wang,Chuntao Lan,Hao Jia,Zhaoling Li
The challenge of achieving high-performance electromagnetic interference (EMI) shielding films, which focuses on electromagnetic waves absorption while maintaining thin thickness, is a crucial endeavor in contemporary electronic device advancement. In this study, we have successfully engineered hybrid films based on MXene nanosheets and Fe 3 O 4 nanoparticles, featuring intricate electric–magnetic dual-gradient structures. Through the collaborative influence of a unique dual-gradient structure equipped with transition and reflection layers, these hybrid films demonstrate favorable impedance matching, abundant loss mechanisms (Ohmic loss, interfacial polarization and magnetic loss), and an “absorb-reflect-reabsorb” process to achieve absorption-dominated EMI shielding capability. Compared with the single conductive gradient structure, the dual-gradient structure effectively enhances the absorption intensity per unit thickness, and thus reduces the thickness of the film. The optimized film demonstrates a remarkable EMI shielding effectiveness (SE) of 49.98 dB alongside an enhanced absorption coefficient (A) of 0.51 with a thickness of only 180 μm. The thin films with a dual-gradient structure hold promise for crafting absorption-dominated electromagnetic shielding materials, highlighting the potential for advanced electromagnetic protection solutions.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaoyan Wu,Du Sun,Mi Li,Xiaowen Zhang,Naif Abdullah Al-Dhabi,Qi Fang,Wangwang Tang,Qiuyang Tang,Jie Kou,Ziyin Wang,Xue Zhang,Yilong Hua,Tao Cai
Microbial fuel cells (MFCs) have gained increasing attention in the field of uranium-containing wastewater (UCW) treatment as a self-powered bioelectrochemical system (BES) due to its advantages of recovering uranium resources and generating electricity. However, the lack of catalytic active sites on the carbon fiber cathode significantly hinders the reaction performance of surface electrons with uranium ions in solution, thereby limiting the application of MFC. In this study, we propose a carbon brush (CB) cathode modification process that utilizes cyclic voltammetry synthesis technique (CVS) to polymerize aniline (PA) on the surface of carbon fibers and uniformly load nano-Fe 3 O 4 particles (nFe 3 O 4 ). The loading of PA/nFe 3 O 4 not only significantly improve the catalytic active sites but also enhance the synergistic effect of adsorption and conductivity of CB cathode. Consequently, the nFe 3 O 4 /PA/CB-MFC showed excellent ability to continuous power generation and uranium separation. Over eight cycles of uranium separation, the nFe 3 O 4 /PA/CB-MFC exhibited an average maximum power density of 15.17 mW/m 2 and a uranium separation efficiency of 95.52 %, showcasing substantial enhancements by 2.10-fold and 1.44-fold compared to the CB-MFC, respectively. Our study presents an efficient approach to enhance the efficiency of uranium separation and boost power density of MFC by increase catalytic active sites on carbon-based cathode.
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Heliyon
·
2024
·
IF 3.4
Xiang Liu,Zhi Yu,Shan Fang,Yong Li,Guoxing Qu,Nai-Gen Zhou,Dong-Liang Peng
Si-based anode materials have a relatively high theoretical specific capacity and low operating voltage, greatly enhancing the energy density of rechargeable lithium-ion batteries (LIBs). However, their practical application is seriously hindered by the instability of active particles and anode electrodes caused by the huge swelling during cycling. How to maintain the stability of the charge transfer network and interface structure of Si particles is full of challenges. To address this issue, we have developed a novel Si@Fe 3 O 4 /AC/CNR anode by in-situ growing one-dimensional high elastic carbon nano-ribbons to wrap Si nanoparticles. This special structure can construct fast channels of electron transport and lithium ion diffusion, and stabilize the surface structure of Si nanoparticles during cycling. With these promising architectural features, the Si@Fe 3 O 4 /AC/CNR composite possesses a high specific capacity of 1279.4 mAh/g at 0.5 A/g, and a superior cycling life with 80 % capacity retention after 700 cycles. Even at a high current density of 20.0 A/g, the composite still delivers a capacity of 621.2 mAh/g. The facile synthetic approach and high performance of Si@Fe 3 O 4 /AC/CNR anodes provide practical insight into advanced anode materials with large volume expansion for high-energy-density LIBs.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Qing Kang,Tong Lin,Jingbo Jiao,Yidi Liu,Yurong Guo,Chenjing Ma,Xinjun Du,Shuo Wang
Salmonella typhimurium ( S. typhimurium ) contamination has become the main source of foodborne diseases and has substantial effects on human well-being. Herein, we present a nucleic acid-responsive colorimetric biosensor for ultrasensitive detection of S. typhimurium , integrating a multifunctional Fe 3 O 4 @Zr-MOF/GOx nanoprobe with exponential amplification reaction (EXPAR). The system integrates glucose oxidase (GOx) encapsulated within a Zr-based metal-organic framework (Zr-MOF) modified with magnetic Fe 3 O 4 nanoparticles. In the presence of S. typhimurium , the EXPAR reaction is triggered, and the controlled release of GOx is achieved by DNA strand displacement. The detection mechanism leverages GOx-catalyzed glucose oxidation to generate H 2 O 2 , which oxidizes 3,3’,5,5’-tetramethylbenzidine (TMB) for colorimetric signal readout. The biosensor demonstrates high specificity for S. typhimurium , with a detection limit of 2.26 CFU mL⁻¹ , and practical applicability in spiked milk samples, achieving recoveries of 89.6–111.5 %. The strategy employing stimuli-responsive DNA/MOF composites demonstrated significant potential in food quality monitoring and analysis.
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高影响因子
PROGRESS IN NUCLEAR ENERGY
·
2025
·
IF 3.2
Shizong Wang,Jianlong Wang
Fe 3 O 4 microparticles have been investigated for U(VI) removal. However, the effect of the size of Fe 3 O 4 microparticles on U(VI) removal has not been investigated. Herein, four different sizes (100, 200, 300 mesh, and nano) of commercial Fe 3 O 4 microparticles were used to investigate the size effect on U(VI) removal. The results showed that Fe 3 O 4 microparticles with a size of 200 mesh (Fe 3 O 4 -200) showed the best removal efficiency with a removal capacity of 19.3 mg/g. Characterization analysis showed that Fe 3 O 4 microparticles with 100 and 300 mesh and nano consisted of Fe 3 O 4 phase, whereas Fe 3 O 4 -200 was made up of Fe 2 O 3 and Fe 3 O 4 phase. The combination of Fe 2 O 3 and Fe 3 O 4 phase produced more oxygen vacancies, which endowed Fe 3 O 4 -200 with a superior removal capacity for U(VI). The solution pH affected U(VI) removal by Fe 3 O 4 -200. When the solution pH was 5.0, the U(VI) removal efficiency reached a maximum value. The effect of chloride ions was concentration-dependent, whereas sulfate ions slightly inhibited U(VI) removal. Carbonate ions strongly inhibited U(VI) removal. The U(VI) removal fitted the pseudo-second-order kinetics equation and Langmuir model well. Further thermodynamic analysis proved that Fe 3 O 4 -200 has high reaction ability with U(VI). Fe 3 O 4 -200 can be reused, and the adsorbed U(VI) can be easily recovered using sodium carbonate, sodium acetate, hydrochloric acid and sodium hydroxide. This study provides insight into U(VI) removal by different sizes of Fe 3 O 4 microparticles, and paves a new avenue for designing highly efficient adsorbents for U(VI) removal from water bodies.
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