APPLIED SURFACE SCIENCE
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2016
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IF 3.15
Xiaoyuan Zhang,Jianning Wu,Guihua Meng,Xuhong Guo,Chang Liu,Zhiyong Liu
For the first time, novel multifunctional superparamagnetic PANI–Fe 3 O 4 @ZnO core–shell composite photocatalysts with different PANI: ZnO ratios were synthesized by Pickering emulsion route in one step in the presence of ZnO nanoparticles. PANI–Fe 3 O 4 @ZnO core–shell microspheres consist of PANI core which embedded with Fe 3 O 4 -OA (oleic acid modified Fe 3 O 4 ) nanoparticles and tunable ZnO shell thickness. The resulting samples were thoroughly studied by using X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), transmission electron microscopy (TEM), scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS). The catalytic activity of the as-prepared PANI–Fe 3 O 4 @ZnO core–shell microspheres is investigated by the degradation of MB under visible light irradiation. As expected, the as prepared PANI–Fe 3 O 4 @ZnO photocatalysts exhibit highly enhanced photocatalytic activities in the degradation of MB under visible light irradiation owing to fast separation of photo-generated electron-hole pairs. Significantly, the PANI–Fe 3 O 4 @ZnO catalysts can be separated from the reaction media by applying an external magnet, and can be reused for seven cycles without change in stability and degradation efficiency.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Xuemin Sun,Ge Gao,Dongwei Yan,Chuanqi Feng
The Fe 3 O 4 @MOF composite with a microspheric core and a porous metal-organic framework (MOF HKUST-1) shell has been successfully synthesized utilizing a versatile Layer-by-Layer (LBL) assembly method. The structure was identified by X-ray diffraction (XRD), and the morphology was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. The Fe 3 O 4 @MOF composite exhibited outstanding electrochemical properties when it was used as an anode material for lithium ion batteries (LIBs). After 100 discharge-charge cycles at a current density of 100 mA g −1 , the reversible capacity of Fe 3 O 4 @MOF could maintain ∼1002 mAh g −1 , which was much higher than that of the bare Fe 3 O 4 counterpart (696 mAh g −1 ). Moreover, load the current density as high as 2 A g −1 (after 70 cycles at the current density step increased from 0.1 to 2 A g −1 ), it still delivered a reversible capacity of ∼429 mAh g −1 . The results demonstrate that the cycling stability of Fe 3 O 4 as an anode could be significantly improved by coating Cu 3 (1,3,5-benzenetricarboxylate) 2 (HKUST-1). This strategy may offer new route to prepare other composite materials using different particles and suitable Metal-organic frameworks (MOFs) for LIBs application.
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CHROMATOGRAPHIA
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2016
·Vol. 80
·期 1
·165-170
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IF 1.332
Yu Tianxiao,Wang Teng,Huang Zhenglan,Huang Ningshu,Zhang Hui,Luo Zhenhong,Li Hui,Ding Shijia,Feng Wenli
Abstract Pesticides are often involved in numerous acute and fatal poisonings. Patients’ blood samples may be sent to a toxicological laboratory for a poisoning diagnosis. This study proposes a gas chromatography-mass spectrometry (GC–MS) method for the determination of seven pesticides (malathion, methyl isofenphos, dichlorvos, chlorpyrifos, phenthoste, p , p ′-DDD, p , p ′-DDE) in human blood based on a quick, easy, cheap, effective, rugged and safe (QuEChERS) sample preparation method with Fe 3 O 4 magnetic nanoparticles (MNPs) as the new adsorbing material. It proved that Fe 3 O 4 MNPs have excellent adsorbent function while purifying the complex blood sample and it is simple to be separated from the extract. Under the optimum conditions, the detection limits of the proposed method for seven pesticides ranged from 0.011 to 0.163 µg mL −1 . Good linearity ( R value ≥0.9949) was achieved at concentration levels of 0.3–4.0 µg mL −1 , and acceptable method recoveries were found in the range of 70.0–111.8% at different concentrations, with the relative standard deviations (RSD) less than 10.5%. In short, the QuEChERS method with Fe 3 O 4 MNPs used for removing impurities improved the speed of sample pre-treatment and exhibited an enhanced performance in purifying. It can be applied for both forensic and clinical cases of accidental or suicidal poisoning with these pesticides. Graphical abstract
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ELECTROCHIMICA ACTA
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2016
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IF 4.803
Tao Li,Xue Bai,Yong-Xin Qi,Ning Lun,Yu-Jun Bai
Fe 3 O 4 has been regarded as one of the sustainable alternatives for anode materials of Li-ion batteries (LIBs), but the severe volume expansion and agglomeration of Fe 3 O 4 nanoparticles pose limitations to the lithium storage capability. In this paper, Fe 3 O 4 nanoparticles are loaded on the carbon derived from inner pomelo pericarp to form Fe 3 O 4 /C composite. Benefiting from the synergistic effect of the good electronic conductivity of the biochar and the high capacity of Fe 3 O 4 nanoparticles, the composite delivers a pronounced reversible capacity of 1003.3 mAh g −1 after 200 cycles at 100 mA g −1 , and reveals an impressive high rate capacity of 634.6 mAh g −1 at 500 mA g −1 with the capacity fading of 0.074% per cycle, suggesting the great potential as anode materials for LIBs. The mineral substances of uniformly distributed KCl and CaCO 3 in the biochar play an important role in enhancing the electrochemical performance of the composite.
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ADVANCED POWDER TECHNOLOGY
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2016
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IF 2.478
Li Zhou,Benzhao He,Fangming Wu,Jia Wu
In this paper, we report for the first time that metal oxide nanocrystals (MONs) including magnetic Fe 3 O 4 and luminescent ZnO nanocrystals can be facilely synthesized through a one-step reaction by using castor oil (CO) as both stabilizer and reaction solvent. The obtained MONs with relatively uniform size (2–5 nm) show high solution dispersibility and stability. The existence of CO components on the surfaces of MONs was confirmed by thermogravimetric analysis and FTIR characterizations. Benefiting from the presence of CO components, the MONs possess multiple surface hydroxyl groups that can be easily tailored. Moreover, the MONs exhibit favorable compatibility with polymer (e.g., poly(ethylene-co-vinyl acetate)) and can not only endow the polymer with magnetic or luminescent properties but also enhance the UV-shielding and mechanical properties of polymer. Considering the simple synthetic process and robust performance of the MONs, this study may open up new opportunities for the practical applications of MONs.
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CHEMICAL ENGINEERING JOURNAL
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2016
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IF 5.31
Qihang Yi,Lingjun Bu,Zhou Shi,Shiqing Zhou
In this paper, epigallocatechin-3-gallate/Fe 3 O 4 , a novel heterogeneous catalyst to activate peroxymonosulfate for diuron degradation, was synthesized and its structure was well characterized by transmission electron microscopy, X-ray diffraction, Fourier transform infrared, and X-ray photoelectron spectroscopy. It was found that the hybrid catalyst showed a better catalytic efficiency than both Fe 3 O 4 and epigallocatechin-3-gallate. This was resulted from the high reduction ability of epigallocatechin-3-gallate, which promoted the cycle of Fe(III)/Fe(II) on the surface of catalyst. Besides, batch experimental results showed that the degradation of diuron depended upon the dosage of catalyst and oxidant, initial pH, and co-existed humic acid. Results demonstrated that high catalyst and oxidant dosages, low initial pH and humic acid were favorable for diuron removal. Furthermore, by adding different dosages of methanol and tertiary butanol, two kinds of radicals were detected to be responsible for diuron degradation in this study and sulfate radical made the predominant contribution. At last, mineralization and degradation pathway were also evaluated in this study. Anyway, it was confirmed that the as-prepared catalyst has the potential superiority for contaminants removal from aqueous solution.
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Scientific Reports
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2017
·Vol. 7
·期 1
·1-12
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IF 4.259
Zhou Shukui,Yin Ting,Zou Qingsong,Zhang Kaile,Gao Guo,Shapter Joseph G.,Huang Peng,Fu Qiang
Cell sheet therapy has emerged as a potential therapeutic option for reparation and reconstruction of damaged tissues and organs. However, an effective means to assess the fate and distribution of transplanted cell sheets in a serial and noninvasive manner is still lacking. To investigate the feasibility of tracking Adipose derived stem cells (ADSCs) sheet in vivo using ultrasmall super-paramagnetic Fe 3 O 4 nanoparticles (USPIO), canine ADSCs were cultured and incubated with USPIO and 0.75 μg/ml Poly-L-Lysine (PLL) for 12 h. Labeling efficiency, cell viability, apoptotic cell rate were assessed to screen the optimum concentrations of USPIO for best labeling ADSCs. The results showed ADSCs were labeled by USPIO at an iron dose of 50 μg/ml for a 12 h incubation time, which can most efficiently mark cells and did not impair the cell survival, self-renewal, and proliferation capacity. USPIO-labeled ADSCs sheets can be easily and clearly detected in vivo and have persisted for at least 12 weeks. Our experiment confirmed USPIO was feasible for in vivo labeling of the ADSCs sheets with the optimal concentration of 50 μg Fe/ml and the tracing time is no less than 12 weeks.
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CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Tianyi Sun,Zhiwei Zhao,Zhijie Liang,Jie Liu,Wenxin Shi,Fuyi Cui
A bifunctional CuO-Fe 3 O 4 material was synthesized and employed for the photocatalytic degradation of p-arsanilic acid (p-ASA) under visible light irradiation and simultaneous removal of the released inorganic arsenic by adsorption from solution. The effects of major factors, including solution pH, bicarbonate ion, halide ion and humic acid , on the p-ASA degradation were investigated. Under various water quality conditions, an excellent removal of p-ASA could always be achieved by the CuO-Fe 3 O 4 photocatalytic process and p-ASA could be completely converted to As(V) within 36 min. Simultaneously, the released As(V) could be adsorbed onto the surface of CuO-Fe 3 O 4 nanoparticles with high efficiency above 95% at initial pH range from 4 to 7. The presence of humic acid significantly weakened the degradation of p-ASA by scavenging OH, and slightly inhibited the As(V) removal. On the basis of the UV–vis, FTIR, XPS analysis and the major degradation products detected, the mechanism of the p-ASA photocatalytic degradation and the released As(V) adsorption by CuO-Fe 3 O 4 nanoparticles was given, and the degradation pathway of p-ASA during the photocatalytic process was also taken into consideration. Combined with the photocatalytic property and the high adsorption capacity of As(V), the synthesized magnetic CuO-Fe 3 O 4 nanoparticles have significant potential applications for controlling the risk of p-ASA in wastewater.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2016
·Vol. 92
·期 7
·1601-1612
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IF 2.738
Jiahua Lu,Qing Liu,Zhongduo Xiong,Zhijun Xu,Yingjie Cai,Qiang Wang
BACKGROUND Synthetic dyes are present in the wastewater from many industrial processes and they cause serious problems to human and aquatic life. The development of a novel and effective peroxymonosulfate (PMS) activator is proposed to eliminate dyes pollution. A new magnetic nanocomposite, Fe 3 O 4 @C/MnCo 2 O 4 , was prepared and characterized. The activity of Fe 3 O 4 @C/MnCo 2 O 4 as heterogeneous catalyst for PMS activation was evaluated by the decolorization of Acid Orange II (AO II). RESULTS With a ‘Fe 3 O 4 @C/MnCo 2 O 4 + PMS’ system, the dye solution could be nearly completely decolorized in about 25 min over a wide pH range (pH 4.1−8.1), and 98% removal could be achieved in 15 min without pH adjustment (pH = 6.38). The influence of solution pH, dosage of catalyst and PMS, reaction temperature, and PMS activation mechanism were studied. It was found that sulfate radicals were the primary species responsible for the oxidation of AO II. The catalyst was magnetically separable and displayed good stability and reusability, giving six cycles of use without deterioration in its performance. CONCLUSION This study demonstrated the simple recycling and high activity of Fe 3 O 4 @C/MnCo 2 O 4 composite in PMS activation for the decolorization of AO II solution. It provides a promising way for the decontamination of organic pollutants. © 2016 Society of Chemical Industry
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Journal of Materials Chemistry A
·
2016
·Vol. 5
·期 3
·958-968
·
IF 8.262
Wentao Wang,Bingtao Tang,Benzhi Ju,Zhanming Gao,Jinghai Xiu,Shufen Zhang
As an important energy utilization mode, thermal energy is closely related to human life and social production. Phase change materials have been widely adopted to store thermal energy to improve its utilization efficiency. However, the inherent low energy conversion ability of these materials is one of the key problems to be resolved urgently. In this paper, we report novel magnetic- and sunlight-driven energy conversion and storage nanocomposites based on Fe3O4-functionalized graphene nanosheet (Fe3O4–GNS) embedded form-stable polymer phase change materials. Owing to the excellent magnetocaloric performance of Fe3O4 and the universal photoabsorption and photothermal conversion of graphene, the nanocomposites can effectively convert magnetic or light energy into thermal energy under an alternating magnetic field or solar illumination. The energy is stored by phase change materials during the phase transition process. The obtained hybrid nanocomposites exhibit excellent thermal stability with high melting–freezing enthalpy and excellent reversibility. Furthermore, the novel nanocomposites show the characteristics of form-stable phase transformation. The Fe3O4–GNS embedded phase change material composites for energy conversion and storage are expected to open up a rich field of energy materials.
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Thoracic Cancer
·
2024
·
IF 2.3
Xiaoxu Lan,Xiao Wang,Liying Shao,Jiayue An,Simin Rong,Xiancong Yang,Hongfang Sun,Yan Liang,Ranran Wang,Shuyang Xie,Youjie Li
Background Existing studies have shown that transferrin receptor (TfR) is highly expressed on the surface of lung cancer cells, and nanoparticles (NPs) have been widely used as delivery vehicles. The aim of this study was to investigate the effect of the targeted delivery of Fe 3 O 4 NPs modified with transferrin (Tf) compared with photothermal treatment for lung cancer. Methods The morphology and properties of Fe3O4 NPs modified with Tf were tested by internal morphological characterization experiments including transmission electron microscopy, particle size meter infrared spectrometer and other experiments. The delivery of materials was investigated by cell proliferation and apoptosis experiments, and western blot experiment was used to detect yes-associated protein 1(YAP1) protein expression changes after delivering miR-15a-5p. In addition, animal models were constructed to further explore the targeting properties of the material. Results The results demonstrated that the nanomaterial has good stability and targeting properties. Meanwhile, we also discovered that the miR-15a-5p carried by NPs can inhibit cell growth after its entry to the lung cancer cells. The effect became more evident when the nanomaterials were assisted with laser therapy, as verified by in vivo and in vitro experiments. In terms of the related mechanism, miR-15a-5p inhibited YAP1 expression, which affected cell proliferation and apoptosis. Conclusion In this study, Fe3O4 NPs modified with Tf delivered miR-15a-5p in combination with photothermal therapy for lung cancer. In future research, the targeted delivery of Tf and the photothermal synergy of nanomaterials will provide a theoretical basis for cancer treatment.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Jing Mei,Yuqing Deng,Xiaohong Cheng,Qi Wu
This study employed a one-step hydrothermal process to synthesize Ni 3 S 2 /Fe 3 O 4 nanoblocks in situ on nickel foam (NF). The resulting Ni 3 S 2 /Fe 3 O 4 /NF catalyst demonstrates exceptional electrocatalytic activity for the oxygen evolution reaction (OER) and robust long-term stability. It achieves a low overpotential of only 220 mV for a current density of 10 mA cm −2 with a Tafel slope of 54.1 mV dec −1 and remains stable in 1.0 M KOH for 66 h. The binder-free self-supported three-dimensional nanoblocks enhance the reaction region and long-term stability. Electronic interactions between Fe 3 O 4 and Ni 3 S 2 , coupled with heterogeneous interfaces, optimize the electronic structure, fostering the formation of highly reactive species. Density-functional theory (DFT) calculations confirm that Ni 3 S 2 /Fe 3 O 4 , with a heterogeneous interfacial structure, modulates the chemisorption of reaction intermediates on the catalyst surface, optimizing the Gibbs free energies (ΔG) of oxygen-containing intermediates. The synergistic effect between the two active materials within the heterogeneous structure enhances OER catalytic performance. This finding offers a valuable approach to designing efficient and stable OER electrocatalysts .
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