JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Teng Chen,Yunlong Geng,Hongri Wan,Yan Xu,Yingmei Zhou,Xiangjun Kong,Jiaomei Wang,Yunhui Qi,Bing Yao,Zhaojian Gao
In this paper, Fe 3 O 4 /Ag/RGO reusable ternary nanocomposites are explored via a facile one-pot solvothermal strategies, and the catalytic performance and antibacterial activity are investigated in detail. The catalytic performance of Fe 3 O 4 /Ag/RGO towards the reduction of 4-NP into 4-AP is evaluated, and the reaction rate constant ( k ) for Fe 3 O 4 /Ag/RGO is calculated to be 0.03086 s −1 , which is higher than that of Fe 3 O 4 /Ag (0.01756 s −1 ), indicating the catalytic activity is improved after decorating Fe 3 O 4 /Ag onto the graphene sheet. The antibacterial experiment shows Fe 3 O 4 /Ag/RGO ternary nanocomposites present a wide range of antibacterial activities against Gram-positive bacteria ( S. aureus and B. cereus ) and Gram-negative bacteria ( E. coli and P. aeruginosa ). The minimal inhibitory concentrations (MIC) for Fe 3 O 4 /Ag/RGO nanocomposites against four bacterial species are determined. Additionally, Fe 3 O 4 /Ag/RGO nanocomposites also present high reusability as catalyst and antibacterial agent. The results illustrated in this paper imply that the multifunctional performances such as efficient reduction of 4-NP followed by superior anti-reproduction of pathogenic bacteria make the Fe 3 O 4 /Ag/RGO ternary nanocomposites a promising catalyst for dye-polluted water and disinfectant agent for wastewater treatment and purification.
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2021
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IF 4.291
Ao Li,Linbei Xie,Sijie Zhou,Min Zhang,Yi Ding,Ping Wang
In this study, the magnetic core-shell nanomaterial Fe 3 O 4 /SiO 2 /N-TiO 2 /Ag/AgCl (FSNT/Ag/AgCl) that efficiently degraded methyl orange (MO) was produced. The dosages of tetrabutyl titanate (TBOT), urea and AgNO 3 were optimized by response surface methodology (RSM). Scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy analysis (XPS), energy dispersive spectrometer (EDS), X-ray diffractometer (XRD), fourier transform infrared spectrometer (FT-IR), and UV–vis diffuse reflectance spectrum (UV–vis DRS) were used to characterize the nanomaterial. The particle size of FSNT/Ag/AgCl was 91.98 nm, and it presented a core-shell structure with Fe 3 O 4 as the core, SiO 2 and N-TiO 2 wrapped in Fe 3 O 4 , and Ag/AgCl deposited on the outermost layer. Performance and mechanism research experiments showed that under the optimized conditions of 1 g/L FSNT/Ag/AgCl, pH = 9, temperature of 35℃ and initial MO concentration of 10 mg/L, about 90 % of MO was degraded in 20 min. The mineralization rate was 35.2 % within 120 min. Holes (h + ) and superoxide anions (·O 2 − ) were the main active substances in the whole photocatalytic degradation. FSNT/Ag/AgCl could be recovered by magnet. After 5 repeated experiments, the degradation rate of MO within 100 min still reached 88.5 %. This work provides a recyclable core-shell nanomaterial for faster degradation of dye wastewater.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Mingliang Ma,Yuying Yang,Yan Chen,Yong Ma,Ping Lyu,Aiqi Cui,Weibo Huang,Zhe Zhang,Yanzheng Li,Feiyan Si
The flower-like Fe 3 O 4 /SiO 2 /MnO 2 /BiOBr-Bi magnetic composite photocatalyst was prepared in this work. The combination of BiOBr and Bi metal with flower-like MnO 2 constituted a heterojunction structure, which increased the specific surface area of the photocatalyst and promoted the separation of photo-generated carriers, resulting in the enhanced catalytic performance. The morphologies and the compositions of the photocatalyst were characterized in detail. Under simulated light, the degradation of organic dye methylene blue (MB) was used to research the photocatalytic activity. In the case of 15 mg photocatalyst, it was found that the photocatalytic degradation efficiency to the MB solution was 95.23% within 150 min. Moreover, the degradation rate of MB could still reach 81.11% after four cycles. The design of flower-like composites with magnetic core-shell structure provided a new method for fabricating photocatalysts having excellent catalytic performance and cyclic stability.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2020
·
IF 5.065
Mina Keshvardoostchokami,Mahyar Majidi,Abbasali Zamani,Bo Liu
Fe 3 O 4 /chitosan/ZIF-8 nanocomposite as a novel bio-adsorbent for phenol removal is reported in the current work. The nanocomposite was prepared in situ, and ZIF-8 particles with rhombic dodecahedron morphology were grown on the composite successfully. FTIR, XRD, FESEM, TEM, BET, and VSM were applied to analyze the nanocomposite physiochemically. Central composite design model (CCD) was applied to optimize effective factors such as phenol initial concentration, pH, time, and adsorbent dosage on phenol uptake. The optimum condition was 77.21% (6.43 mg/g) uptake of phenol from 20 mL solution with initial phenol concentration of 20.22 mg/L and pH = 9.91, by 0.1 g of the adsorbent after 43.44 min. The pseudo-second-order and Langmuir patterns as kinetic and isotherm models interpreted phenol adsorption very well. The current research presents a deep understanding of the formation of Fe 3 O 4 /chitosan/ZIF-8 nanocomposite, which has a suitable potential in phenol adsorption.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 56
·期 2
·1386-1400
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IF 3.553
Tong Zhe,Lu Hailin,Guo Feifei,Lei Wenxing,Dong Mochen,Dong Guangneng
The CNTs@Fe 3 O 4 hybrids were synthesized via a modified co-precipitation method and aligned along the through-thickness of carbon fabrics-reinforced epoxy composites (CFRPCs) by applying a weak magnetic field. The effects of the length, orientation and concentration of CNTs@Fe 3 O 4 on the mechanical and tribological properties of CFRPCs were investigated. The results showed that the modified co-precipitation method decreased the size of Fe 3 O 4 nanoparticles (approximately 10 nm in diameter), promoting the dispersion of CNTs@Fe 3 O 4 in epoxy resin. The alignment of CNTs@Fe 3 O 4 hybrids significantly increased the interlaminar shear strength (ILSS) and hardness of CFRPCs. The long CNTs@Fe 3 O 4 can more effectively improve the ILSS of CFRPCs compared to short CNTs@Fe 3 O 4 . Besides, the addition of aligned CNTs@Fe 3 O 4 hybrids significant improves the tribological properties of CFRPCs. Compared to long CNTs@Fe 3 O 4 -reinforced CFRPCs, the short CNTs@Fe 3 O 4 -reinforced CFRPCs show the best tribological properties. The properties anisotropy of CNTs@Fe 3 O 4 and high CNTs@Fe 3 O 4 concentration in near surface of CFRPCs are the main reason for the improvement in tribological properties of CFRPCs.
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Materials
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2020
·Vol. 13
·期 20
·4527
·
IF 3.057
Hui Liu,Ling Li,Xinxin Wang,Guangzhen Cui,Xuliang Lv
A novel CoS@Fe3O4@rGO aerogel with a unique 3D porous heterostructure was prepared via the solvothermal method, in which cobalt sulfide (CoS) microspheres embedded with Fe3O4nanoparticles were randomly scattered on reduced graphene oxide (rGO) flakes. The introduction of magnetic Fe3O4nanoparticles and rGO regulated the impedance matching, and the excellent electromagnetic wave (EMW) absorption capability of the CoS@Fe3O4@rGO aerogel could be attributed to optimal dielectric loss and abundant conductive networks. The results demonstrated that the minimum reflection loss (RL) value of CoS@Fe3O4@rGO aerogel was −60.65 dB at a 2.5 mm coating thickness with an ultra-wide bandwidth of 6.36 GHz (10.24–16.6 GHz), as the filler loading was only 6 wt%. Such a lightweight CoS@Fe3O4@rGO aerogel with an outstanding absorbing intensity and an ultra-wide effective absorption bandwidth could become a potential EMW absorber.Keywords:microwave absorption;rGO aerogel;CoS;porous structure
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PubMed
高影响因子
ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Yajie Zhao,Binbin Ding,Xiao Xiao,Fan Jiang,Meifang Wang,Zhiyao Hou,Bengang Xing,Bo Teng,Ziyong Cheng,Ping’an Ma,Jun Lin
Nanomaterials with intrinsic peroxidase-like activities are able to catalyze the oxidation of the substrate with the peroxide, which have been widely considered as artificial enzymatic agents in cancer therapy. However, current peroxidase catalytic oxidation treatments generating reactive oxygen species rely highly on hydrogen peroxide and pH, which limit greatly their therapeutic efficiency in the tumor microenvironment. Here, we report a strategy to construct the complex virus-like Fe3O4@Bi2S3 nanocatalysts (F-BS NCs) by connecting typical peroxidase Fe3O4 (MNPs) with a narrow band gap semiconductor Bi2S3 (BS) to enhance the enzymatic activity resorting to the limited intratumoral peroxide and efficient external photothermal stimuli. In this formulation, the integrated F-BS NCs induce cancer-cell death through mild photothermal treatment and sequential photothermal-stimulative catalysis of H2O2 into highly toxic •OH under 808 nm laser, which successfully realize a remarkable synergistic anticancer achievement.
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PubMed
高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Yuan Wang,Yan Zhang,Tian C. Zhang,Gang Xiang,Xinlong Wang,Shaojun Yuan
Efficient removal of trace arsenites [As(III)] in groundwater is a big challenge worldwide. In this study, magnetic Fe3O4@poly(p-phenylenediamine)@TiO2 (Fe3O4@PpPDA@TiO2) core–shell nanoparticles were synthesized for As(III) ions removal via the photocatalytic oxidation–adsorption process. Under dark conditions, the As(III) adsorption on the as-synthesized core–shell nanoparticles obeyed the pseudo-second-order kinetic model and reached adsorption equilibrium within 45 min with a removal efficiency of 36.5%. Under visible-light irradiation, approximately 92% of As(III) ions were transformed into relatively low-toxic As(V) ions via the Fe3O4@PpPDA@TiO2 core–shell nanoparticles, and the arsenic removal efficiency increased dramatically to about 81% owing to As(V) ions being simultaneously adsorbed on the nanocomposite surfaces. The photocatalytic oxidation mechanisms were attributed to the synergism of photogenerated holes, hydroxyl radicals, and superoxide radicals. The as-synthesized Fe3O4@PpPDA@TiO2 core–shell nanoparticles are potentially useful in purifying the trace As(III)-contaminated groundwater owing to their easy magnetic separation, high optical quantum efficiency, and visible-light photocatalytic activity.
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Alexandria Engineering Journal
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2020
·
IF 2.46
Saifeldin M. Siddeeg,Abdelfattah Amari,Mohamed A. Tahoon,Norah Salem Alsaiari,Faouzi Ben Rebah
For the simultaneous removal of water contaminants, a novel nanocomposite has been produced. The iron oxide core with silica shell was used to prepare functional magnetic polymer Fe 3 O 4 /SiO 2 /glycidyl methacrylate (GMA)-S-SH nanocomposite. The sulfur functional nanocomposite is suitable for the immobilization of laccase enzyme. The synthesized nanocomposite was characterized using FT-IR spectroscopy, SEM, TEM, XRD, and magnetometer. The effect of pH, temperature, and storage time over free and immobilized enzyme was studied that indicating the higher stability of immobilized enzyme than that free one. The prepared novel nanocomposite showed high adsorption capacity toward Cd +2 ions in addition to the degradation of meloxicam and piroxicam anti-inflammatory drugs. The removal efficiency reached up to 94% ± 2%, 92% ± 2%, and 95% ± 2% for Cd +2 ions, meloxicam, and piroxicam, respectively at optimum pH and temperature. Also, the results show that this nanocomposite is recyclable. The efficient removal of Cd +2 ions and pharmaceuticals can be reached up to four cycles. We conclude that the prepared nanocomposite is promising for water treatment.
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MACROMOLECULAR MATERIALS AND ENGINEERING
·
2020
·Vol. 305
·期 4
·1900856
·
IF 3.853
Fan Liu,Mengying Li,Fang Li,Kai Weng,Kun Qi,Chunhui Liu,Qingqing Ni,Xuejiao Tao,Jing Zhang,Weili Shao,Jianxin He
Electrospun electret filter material is widely studied because of its excellent removal effect on particulate matter from air streams. Here, a kind of high efficiency and low pressure drop nanofiber (NF) membrane with both electret effect and magnetic effect is developed, and compounded it with glass fiber mesh and polyester (polyethylene terephthalate) mesh to prepare a sandwich structure of NF anti-haze window screen. Under the synergistic effect of magnetic particles, when the density is 2.06 g m −2 , the filtration efficiency of NF anti-haze window screen can reach 99.95% for the fine particles below 0.3 µm, while the filtration pressure drop is only 58.5 Pa, with good light transmittance and excellent breaking strength (6.32 MPa). Therefore, polyvinylidene fluoride/Fe 3 O 4 composite NF membrane has a potential application prospect in the field of air filtration.
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高影响因子
Biosensors-Basel
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2020
·Vol. 10
·期 3
·24
·
IF 3.24
Shanshan Wei,Haolin Xiao,Liangli Cao,Zhencheng Chen
In this article, a highly sensitive label-free immunosensor based on a graphene oxide (GO)/Fe3O4/Prussian blue (PB) nanocomposite modified electrode was developed for the determination of human hepatitis B surface antigen (HBsAg). In this electrochemical immunoassay system, PB was used as a redox probe, while GO/Fe3O4/PB nanocomposites and AuNPs were prepared and coated on screen-printed electrodes to enhance the detection sensitivity and to immobilize the hepatitis B surface antibody (HBsAb). The immunosensor was fabricated based on the principle that the decrease in peak currents of PB is proportional to the concentration of HBsAg captured on the modified immunosensor. The experimental results revealed that the immunosensor exhibited a sensitive response to HBsAg in the range of 0.5 pg·mL−1to 200 ng·mL−1, and with a low detection limit of 0.166 pg·mL−1(S/N = 3). Furthermore, the proposed immunosensor was used to detect several clinical serum samples with acceptable results, and it also showed good reproducibility, selectivity and stability, which may have a promising potential application in clinical immunoassays.Keywords:hepatitis B surface antigen;electrochemical immunosensor;screen-printed electrode;graphene oxide;prussian blue
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高影响因子
Coatings
·
2020
·Vol. 10
·期 1
·51
·
IF 2.436
Tingli Tang,Yanchun Fu
Magnetic wood would have potential uses in electromagnetic shielding and electromagnetic wave absorption. In this paper, magnetic coatings on a wood surface were synthesized using a layer-by-layer self-assembly method. As the cationic polyelectrolyte carrier, natural macromolecular chitosan was pre-immobilized on a wood surface first, followed by the alternate adsorption of anionic polyelectrolyte sodium phytate and positively-charged Fe3O4nanoparticles. The concentration of pH-controlled chitosan solution, sodium phytate solution, and Fe3O4nanoparticle suspension, soaking time, and the number of alternating sedimentary layers varied. The morphology and crystal structure of the Fe3O4modified wood samples were studied using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The magnetic hysteresis loops showed that the modified wood had magnetic properties which were improved as the number of assembled layers increased.Keywords:wood;magnetic;Fe3O4nanoparticles;natural macromolecular polyelectrolyte;layer-by-layer self-assembly
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高影响因子
危险品化学品经营许可证（带存储）