APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Chengxin Wang,Sadaf Mutahir,Liang Wang,Wu Lei,Xifeng Xia,Xinyan Jiao,QingLi Hao
Herein, a double-buffering strategy is presented to boost the lithium storage potential of Fe 3 O 4 . Firstly, the skeleton of MIL-100 (Fe) MOF is grown on graphene oxide, as a self-assembled template via in-situ solvothermal approach, which transform into ultrafine, well-dispersed and mesoporous carbon coated Fe 3 O 4 QDs (4 nm) imbedded on reduced graphene oxide (Fe 3 O 4 QDs@C/rGO), by pyrolysis. Each component in such a well-designed porous hierarchical structure significantly contributes to the remarkable enhancement of lithium ion storage performance, leading to high reversible capability with excellent prolonged cyclic stability after 2000 cycles (505 mAh g −1 at 2.0 A g −1 ). Both, Graphene sheets and mesoporous carbon act as conductive support for anchoring uniform Fe 3 O 4 QDs with confined double buffering for cyclic volume flux. Multi-channels with uniform mesopores in the self-assembled array and 4 nm QDs of Fe 3 O 4 confined in conductive carbon shells were favorable to enhance the interfacial electron/ion transfer, leading to the excellent rate and cycling performance with released volume changes upon Li + insertion/extraction. The present research work provides a promising outset design and synthesis strategies for metal oxide QDs based nanocomposites, which may also be extended to the other electrode material system.
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JOURNAL OF FOOD SCIENCE
·
2019
·Vol. 84
·期 12
·3624-3633
·
IF 2.081
Chunyan Tu,Yinan Guo,Yuanyuan Dai,Wei Wei,Weiping Wang,Liang Wu,Aijun Wang
An aptamer-functionalized Fe 3 O 4 /graphene oxide was synthesized by chemical co-precipitation method and then employed in the magnetic solid-phase extraction for selective enrichment of chloramphenicol before HPLC. The aptamer was covalently bonded to the Fe 3 O 4 /graphene oxide complex by 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride and N -hydroxysuccinimide. Parameters affecting extraction efficiency including solution pH, extraction time and temperature, types and volume of elution solvent, and elution time were investigated in detail. Under the optimal conditions, good linearity was obtained between the peak area and analyte concentration in the range of 7.0 to 1.0 × 10 3 µg/L with the correlation coefficient of 0.9994. The limit of detection and quantitation were 0.24 µg/L and 0.79 µg/L, respectively. The developed method was employed to the analysis of chloramphenicol in honey and milk samples. The recoveries ranged from 80.5% to 105.0% with relative standard deviations less than 8.9%. Practical Application An aptamer-functionalized Fe 3 O 4 /graphene oxide was synthesized and employed in magnetic solid phase extraction for the enrichment of chloramphenicol before HPLC. The presented assay was employed for the determination of chloramphenicol in honey and milk with satisfactory results.
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高影响因子
RSC Advances
·
2019
·Vol. 9
·期 2
·766-780
·
IF 3.049
Lin Guo,Sheng-Shuai Gao,Qing-Da An,Zuo-Yi Xiao,Shang-Ru Zhai,Dong-Jiang Yang,Li Cui
Dopamine-derived cavities/Fe3O4 nanoparticles-encapsulated carbonaceous composites with self-generating three-dimensional (3D) network structure were successfully fabricated by a facile synthetic method, in which sodium alginate provided carbon matrix pores and excellent microwave absorption performance was established. The hollow cavities derived from the core–shell-like CaCO3@polydopamine were creatively introduced into the 3D absorber to significantly improve the absorption performance. The sample calcined at 700 °C exhibited the most outstanding microwave absorption performance, with minimal reflection loss up to −50.80 dB at 17.52 GHz with a rare thickness of only 1.5 mm when filler loading was 35% in paraffin matrix. The effective absorption bandwidth of reflection loss < −10 dB reached 3.52 GHz from 14.48 GHz to 18 GHz, corresponding to the same thickness of 1.5 mm. In contrast, the sample without hollow dopamine-derived cavities showed poor performance due to poor impedance matching, and this highlights the role of hollow cavities brought into the 3D structure, which led to a difference in interfacial polarization, multiple reflections and scattering. The novel dopamine-derived cavities/Fe3O4 nanoparticles-encapsulated carbonaceous composites with 3D network structure can be regarded as a promising candidate for application as a microwave absorber with strong absorption.
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高影响因子
Polymers
·
2019
·Vol. 11
·期 2
·220
·
IF 3.164
Lingyun Wang,Meiying Huang,Hao Tang,Derong Cao,Yu Zhao
Fluorescent magnetic nanoparticles (NPs) utilized for imaging hold great promise for biomedical applications, but it remains a challenging task. Here, we report novel dual-modality NPs using an aggregation-induced emission (AIE)-active and near-infrared (NIR) emissive dye (TPAS) and magnetic Fe3O4as the core, and biocompatible polymer Pluronic F-127 as the encapsulation matrix by self-assembly procedures. The obtained fluorescent-magnetic AIE NPs have both high fluorescence quantum yield (13.8%) at 700 nm and high magnetic saturation value. With good photostability and biocompatibility, the resulting NPs show effective MRI ability, but also a stain in cytoplasm with a strong NIR fluorescent signal.Keywords:dual-modality;AIE;MRI;bioimaging
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Sijia Li,Jianan Cui,Xia Wu,Xuan Zhang,Qi Hu,Xiaohong Hou
Metal-Organic Frameworks (MOFs) are efficient adsorbent and catalyst, however, the prepare of MOFs can be extremely time consuming. The rapid in situ microwave synthesis process offers the possibility of MOFs to a large-scale application. In this study, Fe 3 O 4 @MIL-100(Fe) was rapidly prepared via microwave in 30 min using Fe 3 O 4 as metal precursor and applied as the adsorbent and photocatalyst to remove diclofenac sodium (DCF) from water. Fe 3 O 4 @MIL-100(Fe) exhibited an excellent adsorption effect to DCF with the maximum adsorption capacities of 400 mg/L. The presence of H 2 O 2 could promote the removal of DCF during photocatalytic process. Approximately 99.4% of the DCF was removed in Fe 3 O 4 @MIL-100(Fe)/vis/H 2 O 2 system via adsorption removal and consequent photocatalytic degradation . The high efficiency was attributed to the large BET surface area (1244.62 m 2 /g) and abundant iron metal sites (Fe(III) and Fe(II)) of Fe 3 O 4 @MIL-100(Fe). The adsorptive, photocatalytic property of Fe 3 O 4 @MIL-100(Fe) and the Fenton-like reaction were the main mechanisms for DCF removal. TOC analyzer was served to assess the mineralization of solutions treated by Fe 3 O 4 @MIL-100(Fe)/vis/H 2 O 2 in 12 h. High elimination of TOC (87.8%) was observed during the DCF mineralization process. In addition, the major products were illuminated using HPLC-Q-TOF-MS and DCF degradation pathways were also proposed.
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APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Zilin Meng,Mi Wu,Shifeng Zhao,Ruisen Jing,Shutao Li,Yifei Shao,Xijuan Liu,Fengzhu Lv,Aiju Liu,Qian Zhang
A new approach to remove anionic dyes from wastewater was developed by forming Fe 3 O 4 @Zn-Al layered double hydroxides (ZnAl-LDH) in self-assembly process and naphthol green B (NG) with three negative charges was selected as target contaminant. In this process, the successful synthesis of compound and removal of contaminant were accomplished simultaneously. NG in wastewater can be totally removed and the removal efficiency reached the theoretical maximum of LDH removal capacity. The charge-limited removal process and the molecular arrangement of NG molecules in the ZnAl-LDH interlayer were analyzed experimentally and through simulation. The Fe 3 O 4 with small size was complete cover the layers of ZnAl-LDH making it easily separate from wastewater.
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ENZYME AND MICROBIAL TECHNOLOGY
·
2019
·
IF 3.553
Xuejia Shi,Jin Xu,Changning Lu,Zhenzhong Wang,Wei Xiao,Linguo Zhao
The magnetic particle Fe 3 O 4 -SiO 2 -NH 2 -Cellu-ZIF8 (FSNCZ8) was used to immobilize the high-temperature resistant GH3 β-glucosidase (Tpebgl3) from the Thermomotoga petrophila DSM 13995. The Tpebgl3 has great potential in the catalytic conversion of pharmaceutically active components. The magnetic carrier (FSNCZ8) which provided stronger adsorption capacity, magnetic and high-temperature stability than the previously discussed Fe 3 O 4 -NH 2 -Cellu-ZIF8 without tetraethyl silicate coated. The properties of FSNCZ8-Tpebgl3 (FSNCZ8-T) were as follows: The optimal temperature and pH were 90 °C and 5.5, respectively; the highest activity of FSNCZ8-T approached 2672 U/g; Fe 2+ enabled immobilized enzyme to increase its relative activity to 194%. The main characteristics of FSNCZ8-T, including thermal stability, pH stability, and glucose tolerance, were greatly enhanced by adding Fe 2+ , which was also superior to free enzymes; moreover, the residual activity of FSNCZ8-T was 74% of the initial activity at the end of 10 repeated cycles.
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TALANTA
·
2018
·
IF 4.244
Xiaoman Chen,Zhaoxia Shi,Yufei Hu,Xiaohua Xiao,Gongke Li
In this paper, Fe 3 O 4 -doped nanoporous carbon (Fe 3 O 4 -NC) was synthesized through the carbonization of Fe-porous coordination polymer (Fe-PCP), which are also known as metal-organic framework (MOF), and fabricated into an electrochemical sensor for simultaneous analysis of diethylstilbestrol (DES) and 17β-estradiol (E2) in toner. Fe 3 O 4 -NC was characterized by scanning electron microscope (SEM), powder X-ray diffraction (pXRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, N 2 adsorption-desorption and so on. It is of great practical significance to achieve the simultaneous determination of the two estrogens because estrogens are co-existing in many real samples. The simultaneous determination of two common estrogens, DES and E2, was achieved through electro-catalytically oxidization at a Fe 3 O 4 -NC modified glassy carbon electrode (Fe 3 O 4 -NC/GCE). The peak currents of DES and E2 increased linearly as their concentrations increasing from 0.01 to 12 μmol/L and from 0.01 to 20 μmol/L, with detection limits of 4.6 nmol/L and 4.9 nmol/L (S/N = 3), respectively. This work was focused on the simultaneous determination of the two estrogens in toner. Furthermore, the recoveries of DES and E2 were 91.2–110%, in actual toner samples. The experimental results manifest that the sensor with a stronger anti-interference ability can be used for the simultaneous detection of DES and E2 in the actual toner sample.
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Environmental Science-Nano
·
2018
·Vol. 5
·期 7
·1650-1660
·
IF 6.087
Danna Shan,Shubo Deng,Chengxu Jiang,Yue Chen,Bin Wang,Yujue Wang,Jun Huang,Gang Yu,Mark R. Wiesner
A simple method for the preparation of a three-dimensional (3D) reduced graphene oxide/Fe3O4 (3D-rGO/Fe3O4) hybrid hydrogel was developed via the reduction of graphene oxide by ferrous ions and in situ simultaneous generation of tunable Fe3O4 nanoparticles on graphene sheets. After drying at 50 °C for 1 h, its mechanical strength was enhanced according to elastic modulus analysis. The hydrophilic and strength-enhanced hybrid was suitable for the removal of two typical pharmaceuticals including ciprofloxacin (CIP) and tetracycline (TC). Their adsorption kinetics, isotherms, pH and cation effects on 3D-rGO/Fe3O4 were studied. The adsorption capacities of 3D-rGO/Fe3O4 were 2.78 mmol g−1 for CIP and 4.76 mmol g−1 for TC according to the Langmuir fitting results, which are much higher than those of commercial granular activated carbons and other graphene-based hydrogels. Moreover, the spent 3D-rGO/Fe3O4 can be easily regenerated by Fenton-like catalytic oxidation with little loss of adsorption capacity after ten adsorption–oxidation cycles. The textural structure and surface functional groups on the adsorbent were hardly changed during the oxidative regeneration process. Benefiting from its superiority, both enhanced adsorption and catalytic degradation of pharmaceuticals were simultaneously achieved using this novel hybrid hydrogel, making it competitive in the removal of micropollutants from water or wastewater.
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JOURNAL OF ORGANOMETALLIC CHEMISTRY
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2018
·
IF 1.946
Jin Li,Yajuan Wang,Shunwang Jiang,Hui Zhang
A series of novel magnetic recyclable Pd Au nanoclusters (NCs) catalysts x-PdAu r /Fe 3 O 4 @LDH (x: Pd loading in wt%, r: Au/Pd molar ratio, LDH : layered double hydroxide, here refers the typical MgAl-LDH) were synthesized by a facile polyol reduction followed sol immobilization of PdAu r –PVP on core@shell support Fe 3 O 4 @LDH. Systematic characterizations reveal that the obtained catalysts possess the honeycomb-like core@shell, and the ultrafine PdAu alloy nanoclusters with the size in 1.70–2.55 nm highly dispersed on the LDH nanoplates shell. The obtained catalysts 1.0-PdAu r /Fe 3 O 4 @LDH (r: 0.11, 0.16 and 0.48) show higher Heck activity of iodobenzene with styrene than monomentallic ones, especially 1.0-PdAu 0.16 /Fe 3 O 4 @LDH displays the highest Heck activity under the optimal condition. Moreover, the catalysts can be applied for the Heck reaction of a variety of aryl halides with alkenes , and can be conveniently separated by an external magnet and reused ten runs without significant loss of activity.
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Materials Research Express
·
2019
·Vol. 6
·期 10
·105014
·
IF 1.449
Jianchao Zhang,Lingyun Li,Rongrong Shi,Jiaming Mei,Zhang Xiao,Wei Ma
A convenient and efficient approach for the synthesis of Fe3O4@TiO2 nanocomposites with core-shell structure has been demonstrated. It takes four steps for synthesis process. Oleic acid-coated monodisperse Fe3O4 nanoparticles are obtained firstly, and surface modified Fe3O4 nanoparticles are followed to proceed. Then Fe3O4@TiO2 core-shell nanocomposites are subsequently synthesized using tetrabutyl titanate (TBOT) as titanium source and some polar aprotic solvents used as the mixed solvents. The obtained core-shell structure is composed of a central Fe3O4 nanoparticle core with sequential TiO2 surface, whereas the outer TiO2 coating was useful for the degradation of organic contaminants. Different core-shell nanocomposites in different polar solution are obtained. Shell thickness of Fe3O4@TiO2 nanocomposites could be adjusted rationally by changing synthetic conditions. The measurements of the magnetic properties demonstrate that the Fe3O4@TiO2 core-shell nanocomposites exhibit magnetic behavior at room temperature. The degradation of methylene blue solution was also explored.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Haichao Fu,Peng Zhao,Shengjun Xu,Gong Cheng,Zhuoqian Li,Yi Li,Kai Li,Shuanglong Ma
The novel Fe 3 O 4 and porous biochar originated from Myriophyllum aquaticum composites (Fe 3 O 4 /MC) with graphitized structure, hierarchical porous and strong magnetism were used as efficient catalysts for degradation of organic pollutants in the presence of peroxymonosulfate (PMS). Three types of catalysts pyrolyzed at 600, 700, 800 °C manifested quit different PMS activation effect with the much better p-hydroxybenzoic acid (HBA) degradation efficiency at 700 and 800 °C than that of 600 °C, which was assigned to the high graphitization degree and mesopores ration of catalysts pyrolyzed at higher temperature. Based on radicals quenching experiments and electron paramagnetic resonance (EPR) analyses, the radical pathway dominated by surface-bound SO 4 − was the prevailing way while the non-radical pathway performed as electro-transfer was the recessive way during the degradation process. The large amount of surface-bound SO 4 − radicals were produced through the reduction of PMS by Fe(II), which was regenerated by participation of O 2 − /O 2 . The non-radical pathway was achieved by the graphitized structure which acted as electron transfer bridges accepting electrons form organic pollutants and denoting electrons to PMS. Six HBA intermediates were detected and the possible HBA degradation pathway was proposed tentatively. Consequently, the conversion of Myriophyllum aquaticum to composite catalyst provides a brand-new idea for efficient utilization of waste biomass in a high value-added way and simultaneously achieving the contaminants elimination.
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