JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 56
·期 8
·5015-5030
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IF 3.553
Zhang Zhijuan,Shi Rui,Wang Fuyu,Wang Shuang,Fu Guoyuan,Zou Xinyu,Li Lei,Yu Li,Tian Yurun,Luo Fang
Abstract We synthesized fluffy MoS 2 material stacked by ultrathin nanosheets through adjusting different mass ratios of starting materials via a facile hydrothermal method. Surprisingly, XRD characterization results demonstrated that the intensity ratio of (100) to (002) of ultrathin MoS 2 nanosheets was 0.90 with a 4:5 (CH 3 CSNH 2 : Na 2 MoO 4 ·2H 2 O) mass ratio (M4-5). To the best of our knowledge, this value should be high, implying that the obtained MoS 2 nanosheets exposed considerable (100) facets. Because the noncentrosymmetric Mo-2S on edges terminated by dangling bonds exhibits rich defects, high active MoS 2 edge planes (100) prevail over inert MoS 2 basal planes (002). To overcome its easy suspension and difficult recovery, the magnetic Fe 3 O 4 was selected for in situ doping with ultrathin M4-5, and a unique structure of stable MoS 2 @Fe 3 O 4 (M@F) nanocomposites-like randomly stacked rose petals-wrapped spherical chocolate beans was obtained for the first time. The introduction of Fe 3 O 4 has to sacrifice some edge active sites, but after balancing the magnetic and active sites, (100)/(002) of MoS 2 in M@F can also reach 0.56, showing that edges of MoS 2 nanosheets are still multi-exposed. Abundant exposed edges of M@F provide numerous active centers, so M@F nanocomposites exhibited excellent performance for both the 4-nitrophenol (4-NP) reduction and dye adsorption. Therefore, it has great application prospects in wastewater treatment and reduction reaction and is also worth exploring in other applications. Graphical abstract
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CERAMICS INTERNATIONAL
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2020
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IF 3.83
Gang Su,Lihua Liu,Xing Liu,Lixing Zhang,Jianrong Xue,Anping Tang
A novel magnetic Fe 3 O 4 @SiO 2 @BiFeO 3 /rGO composite was successfully fabricated via a facile hydrothermal method . This composite consisted of flower-like core-shell structured Fe 3 O 4 @SiO 2 @BiFeO 3 microspheres mounting on reduced graphene oxide (rGO) nanosheets . The specific surface areas, magnetization saturation value ( M s ), and band gap energy ( E g ) of Fe 3 O 4 @SiO 2 @BiFeO 3 /rGO (x = 0.15 g) were 139.26 m 2 /g, 20.3 emu/g, and 1.91 eV, respectively. Fe 3 O 4 @SiO 2 @BiFeO 3 /rGO (x = 0.15 g) exhibited remarkable ability to photocatalytically degrade ciprofloxacin (CIP), tetracycline hydrochloride (TC-H), methylene blue (MB), and decolorize a mixed solution of MB, methyl orange (MO), and rhodamine B (Rh B); CIP, TC-H, and MB degradation by Fe 3 O 4 @SiO 2 @BiFeO 3 /rGO conformed to a first-order kinetic reaction, and the corresponding k app values by Fe 3 O 4 @SiO 2 @BiFeO 3 /rGO (x = 0.15 g) were 0.04211, 0.02792, and 0.05967 min −1 , respectively. Excellent magnetic separation performance, recyclability, and stability were also observed. A suitable amount of rGO to the as-prepared photocatalyst could decrease the E g , accelerate the transfer of photogenerated electrons (e − ), suppress the recombination of photo-generated e − –hole (h + ) pairs, and enhance the visible-light response of the catalyst. The •OH is the dominant active species during photocatalysis . This work suggests a promising strategy to synthesize photocatalysts with enhanced ability to catalytically degrade organic pollutant under visible light and excellent recyclability.
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ACS Biomaterials Science & Engineering
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2020
·
IF 4.152
Bing Chun Yan,Jianwen Cao,Jiajia Liu,Yunhao Gu,Zhuobin Xu,Dandan Li,Lizeng Gao
Cerebral ischemic stroke stimulates excessive reactive oxygen species, which lead to blood–brain-barrier disruption, neuron death, and aggravated cerebral infarction. Thus, it is critical to develop an antioxidant strategy for stroke treatment. Herein, we report a dietary strategy to promote stroke healing using iron oxide (Fe3O4) nanoparticles with intrinsic enzyme-like activities. We find that Fe3O4 nanozymes exhibit triple enzyme-like activities, peroxidase, catalase, and superoxide dismutase, thus potentially possessing the ability to regulate the ROS level. Importantly, intragastric administration of PEG-modified Fe3O4 nanozymes significantly reduces cerebral infarction and neuronal death in a rodent model following cerebral ischemic stroke. Ex vivo analysis shows that PEG-modified Fe3O4 nanozymes localize in the cerebral vasculature, ameliorate local redox state with decreased malondialdehyde and increased Cu/Zn SOD, and facilitate blood–brain-barrier recovery by elevating ZO-1 and Claudin-5 in the hippocampus. Altogether, our results suggest that dietary PEG-modified Fe3O4 nanozymes can facilitate blood–brain-barrier reconstruction and protect neurons following ischemic stroke.
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FOOD CHEMISTRY
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2020
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IF 6.306
Huirong He,Da-Wen Sun,Hongbin Pu,Lunjie Huang
Aflatoxin B1 (AFB1) as the most toxic mycotoxin in contaminated food can greatly threaten human health, and sensitive and selective detection of AFB1 is thus highly desired. An ultrasensitive surface-enhanced Raman spectroscopy (SERS) aptasensor was developed for AFB1 detection in peanut oil samples. SH-cDNA modified Fe 3 O 4 @Au nanoflowers acted as capture probes, SH-Apt modified [email protected] nanospheres and commercial Cy3-Apt were used as reporter probes. Strong SERS signals of reporter probes were produced due to the recognition of AFB1 aptamer and its complementary strand (SH-cDNA). With the preferred binding of AFB1 aptamer to AFB1, reporter probes were released from capture probes, causing a linear decrease in SERS intensity. Therefore an ultralow detection limit of 0.40 pg·mL −1 in a wide linear range of 0.0001–100 ng·mL −1 was obtained and the sensibility of this SERS aptasensor was higher than that of the Cy3-Apt based SERS aptasensor. In addition, an excellent selectivity in interfering toxins and satisfactory recoveries of 96.6–115% in peanut oil samples were obtained, proving this aptasensor is a promising analytical tool in AFB1 detection.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
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IF 5.162
Bahaaldin Rashidzadeh,Ebrahim Shokri,Gholam Reza Mahdavinia,Reza Moradi,Sarvin Mohamadi-Aghdam,Shadi Abdi
This work reports the synthesis of novel antibacterial magnetic-/pH-sensitive hydrogel beads based on ionotropic-gelation of alginate biopolymer . Using pomegranate peels extract, green-Ag nanoparticles were synthesized inside a mixture of alginate and Fe 3 O 4 , via in situ method. The alginate beads were investigated by VSM, TEM , XRD, and FE-SEM techniques. The introducing Ag and Fe 3 O 4 nanoparticles in hydrogel beads caused a reduction in the swelling capacity of hydrogel beads. Besides, a pH-dependent swelling behavior was observed for hydrogel beads with a maximum swelling capacity at pH = 7.4. Diclofenac sodium (DS) as a model drug was loaded in hydrogel beads and its release showed a pH-dependent behavior. Drug release studies exhibited significant behaviors on the subject of physiological simulated pHs with a high release rate at pH = 7.4. The alginate beads have shown a prolonged and successive controlled drug release nearly 83% at pH = 7.4 and time 200 min. In addition to the pH, the release of DS from magnetic beads was affected by the external-magnetic-fields. Also, the Ag-incorporated alginate beads showed strong antibacterial activity against S. aureus and E. coli . These results indicated that the hydrogel beads have potentially applicable in drug delivery systems.
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Journal of Materials Research and Technology-JMR&T
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2020
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IF 5.289
Jian Sun,Shaofeng Li,Zhilin Ran,Yingxue Xiang
Fe 3 O 4 @TiO 2 magnetic photocatalytic particles were synthesized and characterized. A composite PVDF separation membrane blended with Fe 3 O 4 @TiO 2 particles was prepared by the phase inversion method. The main purpose was to explore the effect of magnetic fields on the performance of membranes during coagulation bath. The structure characterization, permeability, interception ability, and anti-pollution performance of inorganic particle blend membranes were then tested. Results showed that magnetic field coagulation baths have little effect on the pore structure and hydrophilicity of the membrane surface. When the liquid membranes was condensed under a magnetic field, the magnetic photocatalytic particles could migrate at a greater rate to the surface of the membrane. Through performance tests of the PVDF modified membranes, it was found that a magnetic coagulation bath could promote more Fe 3 O 4 @TiO 2 to aggregate on the surface of the membrane, which led to the blend membrane formed under the magnetic coagulation bath had better antifouling performance against humic acid solution under ultraviolet light irradiation. Membranes with 0.5 wt% magnetic photocatalytic particles in a magnetic field coagulation bath performed best. When filtered under the condition of ultraviolet light, its pure water flux was 1752 L/(m 2 h), and the rejection rate of 20 mg/L humic acid solution was 67.17%. The flux attenuation before and after filtration was 38.84%, the flux recovery rate was 91.10%, and the irreversible pollution index was only 8.90%.
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COMPOSITES SCIENCE AND TECHNOLOGY
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2020
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IF 7.094
Chunyu Du,Min Cao,Mei Li,Hong Guo,Rukang Liu,Baoan Li
Noteworthy improvements of functional composite materials that combine excellent thermal conductivity and superior mechanical strength have induced the rapid development of thermal management technology. However, the frustrating dispersion of fillers leads to phonon scattering, thereby hindering the thermal conduction in the polymer matrix . This study reports an urchin-structured filler that is obtained via hydrothermal synthesis and subsequent graphitic carbon coating and its application in thermally conductive composites. The obtained composites exhibit high thermal conductivity at low filler loadings (2.306 W/m·K, 5 wt%) and excellent stability of the thermal conductivity with the change of the operating temperature. The high thermal conductivity is attributed to the improved dispersibility of the urchin-structured filler according to Agari's model. This work paves a new way for the synthesis of reinforced fillers in thermally conductive composites.
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ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Yutong Luo,Haidong Yang,Ping Ma,Sha Luo,Ziming Zhao,Jiantai Ma
Transitional metal oxides (TMO) exhibit well electrocatalytic performance for oxygen evolution reaction (OER) and have the potential to replace the noble metal electrocatalysts. However, how to further increase the number of catalytic active sites and improve the electrocatalytic activity in alkaline solution is always a great challenge. Therefore, it is necessary to develop high-performance OER electrocatalysts. Herein, the coupled interfacial nanostructure of Fe3O4 and CoO was successfully supported on carbon nanotubes (CNTs) as a highly efficient OER electrocatalyst (denoted as Fe3O4/CoO CNTs) through a simple and feasible two-step synthesis strategy. It is found that the electrocatalyst Fe3O4/CoO CNTs shows remarkable electrocatalytic activity toward OER with a low overpotential of 270 mV (i.e., 1.50 V vs reversible hydrogen electrode) at the current density of 10 mA cm–2 and a small Tafel slope of 59 mV dec–1 in basic media. Additionally, it presents superior electrochemical stability for over 45 h. The outstanding OER performance of the electrocatalyst is mainly derived from the coupled interfacial nanostructure between Fe3O4 and CoO, which promotes the improvement of the electronic structure, increases the number of catalytic active sites, and creates abundant oxygen vacancies. Our work provides a good choice for the future application of TMO-based electrocatalysts in water splitting.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
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IF 5.162
Bo Li,Qi Zhang,Yuanfeng Pan,Yuchen Li,Zhihong Huang,Ming Li,Huining Xiao
Porous magnetic cellulose/Fe 3 O 4 beads (CFBs), consisting of cellulose as matrix and ferrosoferric oxide, were successfully fabricated from microcrystalline cellulose dissolved in an ionic liquid and further modified with glutaric anhydride. The porous structure of modified magnetic cellulose/Fe 3 O 4 beads (MCFBs) was created by nano-sized calcium carbonate (CaCO 3 ). The resulting MCFBs were well characterized and employed as effective adsorbents for removal of dyes from aqueous solution. The adsorption behaviors indicated that the adsorption kinetics was preferably fitted to the pseudo-second-order kinetic model; whereas the adsorption isotherms were well described by Langmuir model with the maximum adsorption capacity of 1186.8 and 151.8 mg/g for methylene blue (MB) and Rhodamine B (RhB), respectively. Moreover, MCFBs are magnetically separable, thus leading to a range of green-based and promising adsorbents towards organic pollutants with easy recovery.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Xin Liu,Jihui Wang,Wenbin Hu
The superparamagnetic Fe 3 O 4 /CS/inhibitor nanocomposite was synthesized by using ionic gel method with Fe 3 O 4 as superparamagnetic core, chitosan as nanocarrier and molybdate (MoO 4 2− ) and benzoate (C 6 H 5 COO − ) working as loaded inhibitors. The morphology, structure and magnetic property of nanocomposite were characterized by transmission electron microscopy , X-ray diffraction, Fourier transform infrared spectroscopy and vibrating sample magnetometer . The release behavior of nanocomposite with and without external magnetic field (“no MF” mode and “MF ON” mode) was conducted by UV–vis spectroscopy, and the corrosion inhibition performance of nanocomposite for carbon in 3.5% NaCl solution was investigated by polarization curve and electrochemical impedance spectrum methods. The results show that the obtained Fe 3 O 4 /CS/inhibitors was in a well-defined core-shell structure with MoO 4 2− and C 6 H 5 COO- loaded flake-like chitosan shell stacking closely to Fe 3 O 4 surface. Under no MF mode, the release behavior of nanocomposite was mainly ion exchange and Fickian diffusion mechanism. Under MF ON mode, the swelling of polymer chains and diffusion between magnetic nanoparticles were involved apart from the ion exchange and Fickian diffusion mechanism. With the addition of nanocomposite inhibitors in NaCl solution, the charge transfer resistance and inhibition efficiency of steel increased firstly and then decreased with the prolonging of immersion time. The highest inhibition efficiency of nanocomposite inhibitors in NaCl solution under on MF and MF ON mode was located in 30 min and 90 min respectively. The inhibition of nanocomposite for carbon steel in NaCl solution is resulting from the reduction of aggressive Cl- concentration in the solution due to the ion exchange between Cl- ions in solution and MoO 4 2− and C 6 H 5 COO- ions in the nanocomposite, and the formation of ferric/ferrous molybdate, ferric/ferrous benzoate and basic ferric benzoate inhibition films on steel. This novel as-prepared composite owns superior loading capacity of inhibitors and its preparation process is especially simple relative to other nanocomposites in previous reported works.
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CARBOHYDRATE POLYMERS
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2020
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IF 7.182
Cheng Zhang,Yankai Dai,Yinqiu Wu,Guangwei Lu,Zheng Cao,Junfeng Cheng,Kailun Wang,Haicun Yang,Yanping Xia,Xiaoqian Wen,Wenzhong Ma,Chunlin Liu,Zhaoli Wang
In this study, Fe 3 O 4 magnetic nanoparticles were synthesized in situ in the polyacrylamide/chitosan (PAAm/CS) hydrogel networks. The obtained hydrogels are characterized by Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD), and Raman spectroscopy. The results confirm that the three-dimensional network structure of the hydrogels is incorporated with Fe 3 O 4 nanoparticles. The adsorption properties of PAAm/CS/Fe 3 O 4 hydrogels for methylene blue (MB) in aqueous solution were studied using Ultraviolet and visible spectrophotometry (UV–vis). The results show that when compared to PAAm/CS hydrogels, PAAm/CS/Fe 3 O 4 hydrogels can adsorb MB with higher adsorption capacities of approximately 1603 mg/g, and the kinetics and isotherm models of the adsorption process could be better described by the pseudo-first order model and Langmuir isotherm model, respectively. Due to the facile preparation, high adsorption capacity, and low cost, the PAAm/CS/Fe 3 O 4 hydrogels are good adsorbents for MB and exhibit significant potential in the treatment of sewage.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 14
·18741-18750
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IF 2.478
Qin Ruifei,Liu Lina
Multifunctional Fe 3 O 4 /Eu(DBM) 3 phen/PVP ((DBM: dibenzoylmethane, phen: 1,10-phenanthroline, PVP: polyvinyl pyrrolidone) microfibers were constructed by simple electrospinning process. The structure and morphology of the microfibers were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images. The diameters of pure PVP microfibers and the microfibers doped only with Fe 3 O 4 nanoparticles (NPs) were uniformly distributed, with an average diameter of about 360 nm. When 3% Eu(DBM) 3 phen complex and Fe 3 O 4 NPs were both added to the precursor for electrospinning, the microfibers became very inhomogeneous in diameter. The photoluminescent properties of pure Eu(DBM) 3 phen complex and composite microfibers were also studied. The characteristic emission peaks of Eu 3+ appeared in the composite microfibers. The intensities of emission and excitation spectra gradually decrease with adding more Fe 3 O 4 NPs. The unit mass of the pure europium complex in some composite microfibers gave stronger luminescence than the pure europium complex. The fluorescence lifetime of 5 D 0 state in the composite microfibers is longer than that of pure europium complex. Additionally, the magnetic properties of Fe 3 O 4 NPs and the composite microfibers were investigated. The saturation magnetization of the composite microfibers was smaller than that of pure Fe 3 O 4 NPs.
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