JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 329
·期 1
·253-263
·
IF 1.371
Zhou Weini,Wang Hongqing,Hou Sanying,Wang Shiyv
A magnetic nano-composites Fe 3 O 4 @SiO 2 @MnO 2 were fabricated for efficient removal of Th(IV) from aqueous solutions, and characterized by SEM, TEM, XRD, FT-IR, BET, VSM, TGA and XPS. And the sorption of Th(IV) on Fe 3 O 4 @SiO 2 @MnO 2 were investigated as a function of pH, adsorbent dosage and initial Th(IV) concentration. The results showed that the adsorption maximum was 53.19 mg g −1 for Th(IV) at pH = 3.5 and T = 298 K. In addition, the adsorption kinetics followed the second-order kinetic model, and the adsorption isotherm could be perfectly depicted by the Langmuir model. Finally, XPS analysis illustrated that the lattice oxygen (M–O) and the surface hydroxyl oxygen (M–OH) participated in adsorption. In brief, the Fe 3 O 4 @SiO 2 @MnO 2 material could efficiently eliminate Th(IV) from aqueous solutions, which might become a promising material for adsorbing Th(IV) from environmental wastewater.
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BIOTECHNOLOGY AND BIOPROCESS ENGINEERING
·
2015
·Vol. 20
·期 5
·901-907
·
IF 1.113
Yang Jianbing,Ni Kefeng,Wei Dongzhi,Ren Yuhong
Ni 2+ -functionalized Fe 3 O 4 @polydopamine magnetic nanoparticles (Ni 2+ -PD-MNPs) were designed and synthesized by in situ coating of magnetic nanoparticles with polydopamine, followed by conjugation of Ni 2+ to the polydopamine film. The Ni 2+ -PD-MNPs were used to purify His-tagged red fluorescent protein (His-RFP) via affinity interaction between Ni 2+ and the His-tag. The results showed that the Ni 2+ -PD-MNPs had extraordinary selectivity for His-RFP purification. In addition, a Histagged transaminase (ω-transaminase BJ110) was selectively immobilized onto the Ni 2+ -PD-MNPs without purification, and the immobilized enzyme showed improved specific activity, as well as enhanced stability and reusability.
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ENZYME AND MICROBIAL TECHNOLOGY
·
2022
·
IF 3.705
Yun-Tao Zhao,Kun Zhang,Jian Zeng,Haowen Yin,Wenjing Zheng,Rui Li,Anzi Ding,Shaohong Chen,You Liu,Wenjin Wu,Zhanxin Jing
Enzyme immobilization technology has a key role in improving the stability of enzyme reaction systems and biocatalyst utilization rates. In this study, polyvinyl alcohol/sodium alginate@Fe 3 O 4 (PVA/SA@Fe 3 O 4 ) magnetic immobilized-enzyme hydrogel beads were prepared. Their structure and morphology were characterized by scanning electron microscopy, surface area and porosity analyses, Fourier transform infrared spectroscopy , X-ray photoelectron spectroscopy and a vibrating sample magnetometer. The capability of PVA/SA@Fe 3 O 4 to adsorb neutral protease was investigated with variations in composition, temperature, pH, stirring speed, enzyme concentration, and crosslinking concentration. The optimal parameters of the immobilization process were determined by response surface methodology (3% neutral protease, 4% crosslinking at 200 rpm, 45 °C and pH 7.2), under which an immobilization rate of 41.98 mg/g was obtained. The thermal stability , acid-base stability, and reusability of the immobilized enzyme were improved significantly. After seven cycles, the immobilized enzyme activity remained at 30.8% that of the initial enzyme activity . The results indicate that the immobilization of NP onto magnetic PVA/SA@Fe 3 O 4 hydrogel beads improves enzyme efficiency, giving this process potential industrial applications.
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PubMed
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Analytical Methods
·
2015
·Vol. 8
·期 2
·303-310
·
IF 1.821
Xiao Sun,Chuanjie Cai,Tao Liu,Guilong Zhang,Dongqing Cai,Shiquan Xiong,Zhengyan Wu
A Fe3O4/Gd2O3 nanocomposite grafted with polyethyleneimine (PEI) molecules was prepared using a one-pot synthesis method. Through this amino functionalized nanocomposite, a selective and ultra-trace electrochemical sensor for Cu2+ was constructed. The electrochemical performances of the sensor were demonstrated by square wave anodic stripping voltammetry (SWASV). Parameters such as the supporting electrolyte, pH of solution, deposition time, and deposition potential for the sensor were optimized. The sensor linearly responded to Cu2+ concentration in the wide range from 6 to 1680 nM with a detection limit of 0.4 nM (3δ method), indicating that this amino functionalized Fe3O4/Gd2O3 composite could be a promising candidate material for the detection of Cu2+.
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Journal of Materials Chemistry A
·
2017
·Vol. 6
·期 3
·1275-1283
·
IF 8.867
Rui Zhou,Ningfei Shen,Jian Zhao,Yu Su,Hejun Ren
Magnetic glutathione (GSH)-functionalized nanocomposites (Fe3O4@GSH) were synthesized via an oxidative polymerization method and characterized as a heterogeneous Fenton-like catalyst for 2,4-dichlorophenol (2,4-DCP) degradation at neutral pH (pH = 6.5). The performance of the composite was extensively investigated in terms of catalytic activity and factors (H2O2 dosage, catalyst loading, initial solution pH, and 2,4-DCP concentration) influencing 2,4-DCP degradation. Iron leaching, primary reactive oxidizing species, and catalyst reusability were also investigated. The results showed that the removal efficiency can reach up to 99% within 240 min in the presence of Fe3O4@GSH, whereas pure Fe3O4 cannot operate under the same circumstances. Hydroxyl radicals (˙OH) were found as the main reactive oxidizing species responsible for pollutant degradation, and the final removal efficiency still reached 94% after recycling three times. The role of GSH can be ascribed to the acceleration of iron leaching from the surface of Fe3O4 and collective action for H2O2. The Fe3O4@GSH catalyst may provide new insights into the Fenton-like process for enhancing contaminant degradation.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 25
·50601
·
IF 3.125
Wenlong Qin,Ruixuan Li,Hanxi Li,Guanfeng Jiang,Guowei Qin,Yang Wang,Jiang Yang
A Fe 3 O 4 nonaparticles coated with acrylamide/2-acrylamido-2-methyl-1-propanesulfonic acid copolymer(Fe 3 O 4 -Polymer NPs) was synthesized by emulsion polymerization. The structure of Fe 3 O 4 -Polymer NPs was then characterized by infrared spectroscopy, thermo-gravimetric analysis, and scanning electron microscopy. Meanwhile, the rheological properties of Fe 3 O 4 -Polymer NPs solution were systematically studied. The results showed that when dosage of hydrophobic Fe 3 O 4 -Oleic NPs is 10%, the synthesized Fe 3 O 4 -Polymer NPs was with the best viscosity enhancement performance, and the maximum saturation magnetization could reach to 20.0 emu/g. The apparent viscosity value of 5000 mg/L magnetic nano-composite solution was 154.6 mPa·s at 30°C. It shows strong viscosity enhancement ability and good temperature performance. Hence, it has great application potential in well stimulation of medium and high temperature oil and gas reservoirs.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Mengyao Han,Cuiling Wu,Jingyu Song,Lushun Yang,Ting Zhang,Yajie Chou,Xueyan Du
With the proliferation of electronic devices and wireless technologies, Electromagnetic Interference (EMI) has become a critical global concern. Correspondingly, the development of efficient EMI shielding materials with strong electromagnetic wave absorption and reflection is imperative. This study presents the fabrication of sandwich-structured composite films (SCFs) utilizing regenerated cellulose (RC) as the matrix, incorporating Ti 3 C 2 T x MXene and Fe 3 O 4 nanoparticles (Fe 3 O 4 NPs) as functional fillers. The SCFs (MXene/RC-Fe 3 O 4 /RC-MXene/RC) were fabricated using an immersion phase conversion method followed by mechanical pressing techniques. The resulting SCFs exhibit a conductivity of 23.8 S/m and a maximum EMI shielding effectiveness (SE) of 32.52 dB. This performance is attributed to the innovative sandwich architecture, which employs a “reflection-absorption-reflection” mechanism to attenuate electromagnetic waves. In addition, MXene is effectively dispersed in the cellulose matrix, enhancing the mechanical properties of the composite films. Notably, increasing the MXene content from 10 wt% to 40 wt% resulted in a tensile strength increase from 9.42 MPa to 17.10 MPa. This research elucidates a robust and scalable approach for the development of advanced electromagnetic shielding materials.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Tauqeer Haidar Qamar,Sibt ul Hassan,Nouman Ahmed,Muhammad Javed Qasim,Sain Bux Jamali,Lei Ma,Shengxiang Huang,Lianwen Deng
The rational design of heterostructures with well-defined chemical composition and spatial configuration stands as a key approach in achieving exceptional performance in electromagnetic wave absorption. This innovative work investigated the electromagnetic wave absorption properties of flower-like CoS/Fe 3 O 4 @PPy composites synthesized by hydrothermal method and in situ polymerization. A comprehensive investigation was conducted into the phase composition, morphology, and absorption properties. Flower-like CoS/Fe 3 O 4 @PPy composite demonstrates remarkable microwave reflection loss of −58.4 dB and effective absorption bandwidth of 5.55 GHz in thickness of 3.1 mm. The superior performances are attributed to the synergistic interplay of interfacial polarization, dielectric loss, magnetic loss, and optimized impedance matching. Furthermore, sufficient decrease in radar cross-section value was observed for the optimal sample with reduction of 41.23 dBm². These results highlight the considerable potential of flower-like CoS/Fe 3 O 4 @PPy composites in addressing electromagnetic pollution and stealth applications.
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TALANTA
·
2024
·
IF 5.6
Xue Zhang,Yunsheng Shang,Qi Xie,Xingzhe Hu,Ke Wu,Lu-Lu Qu,Yingqiu Gu
Developing a Surface-enhanced Raman spectroscopy (SERS) method with excellent detecting ability, good recyclability and analyzing multiple pollutants rapidly are critical for evaluation of water quality in emergency pollution affairs. While constructing a multifunctional substrate with these characteristics to realize the application of SERS in water quality monitoring remains a challenge. In this work, a reusable Au@R–Fe 3 O 4 /g-C 3 N 4 SERS substrate is prepared by loading Au nanoparticles (Au NPs) on Fe 3 O 4 nanorings (R–Fe 3 O 4 ) and the formed Au@R–Fe 3 O 4 is further combined with g-C 3 N 4 nanosheets through a simple electrostatic assembly method. The Au@R–Fe 3 O 4 /g-C 3 N 4 nanocomposite presents multifunction of magnetic enrichment, SERS signal enhancement, multiple pollutants analyzing, and photocatalytic activity , which achieves quantitative detection of rhodamine B (RhB), tetracycline hydrochloride (TC), and 4-chlorophenol (4-CP), with detection limits of 5.30 × 10 −9 , 7.50 × 10 −8 , 7.69 × 10 −8 mol/L, respectively. Furthermore, the recyclable detection capability of Au@R–Fe 3 O 4 /g-C 3 N 4 for multi components is demonstrated by the strong SERS signal after 9 cycles of “detection-degradation” processes. Combined with good uniformity and stability, this SERS method based on Au@R–Fe 3 O 4 /g-C 3 N 4 substrate provides a new strategy for the multi-pollutants detection and degradation in water environment.
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PubMed
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Zixuan Li,Jiacheng Sun,Qinghong Shi,Xiaoyan Dong,Linling Yu,Yan Sun
Bisphenol A (BPA) is a well-recognized endocrine-disrupting chemical that poses risks to both human health and the environment. Laccase can effectively biodegrade bisphenol A, but the low environmental temperature (∼25 °C) restricts the biodegradation efficiency. In this study, the enzyme laccase and Fe3O4 with solar–thermal conversion capability were coimmobilized into zeolitic imidazolate framework-8 (Lac@ZIF-8-Fe3O4) to facilitate efficient biodegradation of bisphenol A under simulated solar irradiation. Compared to free laccase, Lac@ZIF-8-Fe3O4 exhibited high activity recovery (115.5%), an ∼39% increased catalytic constant, more effective bisphenol A biodegradation (up to 24-fold) at extensive bisphenol A concentrations (5–100 mg/L), excellent thermal stability (50 °C, 12 h), acid-tolerance (pH 3), and storage ability in 10 days. Simulated solar irradiation (1 kW/m2) increased the temperature of Lac@ZIF-8-Fe3O4 solution (10 μg laccase/mL) from 25 to 42.5 °C within 15 min, resulting in 96.4% biodegradation of bisphenol A within 60 min, nearly double the biodegradation efficiency under dark condition (55.9%). Furthermore, Lac@ZIF-8-Fe3O4 maintained 99.0% biodegradation efficiency even after 12 recycles of use under simulated solar irradiation (5 mg/L bisphenol A, 80 min/cycle). This work has thus offered efficient biocatalysis for integrating solar-energy promotion and enzymatic catalysis in treating environmental BPA pollutants. Further, the experimental findings benefited from the development of more sustainable and high-performance immobilized enzyme preparations for pollutant treatment via solar–thermal promotions.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Xiaoqing Ma,Wenxi Zhao,Kang Lu,Chenke Zhang,Chengsong Yuan,Kang-lai Tang
Considering the destructive effect of excess residues of nitrite (NO2–) and hydrogen peroxide (H2O2) in food, herein, we introduce a unique synthetic strategy to design and construct high-performance sensing heterostructure materials [spindle-like Fe3O4/NiO@N-doped carbon (Fe3O4/NiO@N–C)] using Fe-based metal–organic frameworks as self-sacrifice template and further evaluate its quantitative capabilities for NO2– and H2O2 determination. Notably, the well-designed three-dimensional hierarchical hollow Fe3O4/NiO@N–C nanocomposites integrate the significant merits of hollow heterointerface structure and suitable electrocatalytic properties of different nanomaterials, which prompt the exposure of electroactive sites, the acceleration of electron/ion transfer rate, as well as the prolongation of structural robustness when unitized as electrocatalysts for NO2– oxidation and H2O2 reduction. Accordingly, it achieved remarkable sensitivity (1040.3 ± 0.0078 and 615.7 μA mM–1 cm–2 ± 0.0056) and low limit of detection (LOD) (21 and 129 nM) at desirable working potential (0.85 and −0.45 V); meanwhile, their selectivity, durability, and repeatability are also deserved to be declaimed. More importantly, this realizes successful recovery analysis in pickled mustard with high reliability and excellent applicability. Such significative research could provide instructive advice for the reasonable design of other heterostructured metal oxide and further highlight their untapped potential in food analysis, as well as human health and ecosystems.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Hongzhan Chen,Binbin Sun,Jiaqi Zhang,Zhiliang Zhang,Jianbo Qu
In this work, integrated in-situ reducibility of polydopamine (PDA) with magnetic-responsive performance of ferroferric oxide (Fe 3 O 4 ) nanoparticles, a series of Fe 3 O 4 @PDA@AgNPs were engineered through in-situ grown silver nanoparticles (AgNPs) on the surface of Fe 3 O 4 nanoparticles. The synthesized Fe 3 O 4 @PDA@AgNPs could serve as superb surface enhancement Raman scattering (SERS) substrates for ultrasensitive detection of multi-component industrial dyes in the complex environment. With 4-aminothiophenol (4-ATP) as probe molecules, the Fe 3 O 4 @PDA@AgNPs demonstrated exceptional SERS sensitivity and uniformity, achieving an enhancement factor as high as 7.8 × 10 6 . Notably, the Fe 3 O 4 @PDA@AgNPs demonstrated outstanding magnetic response and molecular enrichment effect, and realized multi-component detection of Rhodamine 6 G (R6G) and Nile Blue A (NBA) molecular mixtures. The detection limit for R6G and NBA was 1 × 10⁻⁷ M and 5 × 10⁻⁷ M respectively. The magnetic Fe 3 O 4 @PDA@AgNPs represent outstanding SERS platforms, and would hold great potential in the quantitative and qualitative detection of dye molecules.
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