APPLIED SURFACE SCIENCE
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2014
·
IF 2.538
Hualin Jiang,Pinghua Chen,Weibo Zhang,Shenglian Luo,Xubiao Luo,Chaktong (Peter) Au,Menglin Li
Herein we report a novel method to exfoliate graphite to thin structure by depositing nanoparticles. Graphite was oxidated to graphite oxide (GO), and then nano Fe 3 O 4 @mZrO 2 was loaded and inserted between GO sheets as GO being reduced to reduced graphite oxide (rGO) in one step by hydro-thermal co-precipitation. As-obtained nanocomposite Fe 3 O 4 @mZrO 2 /rGO was characterized by SEM, TEM, AFM, FT-IR, BET, XRD, VSM and EDX techniques. The microscopic studies show the thickness of Fe 3 O 4 @mZrO 2 /rGO sheet is significant thinner than that of rGO sheet. Evidences indicate the presence of nano Fe 3 O 4 @mZrO 2 effectively preserves rGO sheets from stacking and forming thick structure. Amaranth was used as a model contamination to investigate the adsorption ability of the nanocomposite due to its hazardness. It shows effective adsorption ability. Based on all the evidence shown in studies, a possible mechanism for the adsorbent composing and its amaranth adsorption was postulated.
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FUEL
·
2015
·
IF 3.52
Fan Zhang,Zhen Fang,Yi-Tong Wang
Magnetic heterogeneous catalyst (Na 2 SiO 3 @Fe 3 O 4 /C) was prepared for the production of biodiesel from oils with high acid value (AV) under ultrasonic (US) irradiation and magnetic stirring (MS). With the catalyst and assisted by US, soybean biodiesel yield reached >90% in only 20 min (or at 318 K) and 97.9% under the optimal conditions. It was easily magnetically separated for 5 cycles with 94.9% recovery rate and biodiesel yield >80% with both US and MS. The catalyst transesterified Jatropha oil with biodiesel yields of 94.7%, 93.2% and 83.5% at AV of 1.3, 4.8 and 7.3 (mg KOH/g) with US, and was cycled 5 times with yield >70% at AV of 4.8 assisted by US and MS. High biodiesel yield (90.7%) was still achieved from high AV oil (4.8) at low US energy density (0.1 W/mL) and MS. The catalyst combined with US and MS can find practical application for direct production of biodiesel from oils with high AV.
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ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Wei Feng,Xiaojun Zhou,Wei Nie,Liang Chen,Kexin Qiu,Yanzhong Zhang,Chuanglong He
Construction of multifunctional nanocomposites as theranostic platforms has received considerable biomedical attention. In this study, a triple-functional theranostic agent based on the cointegration of gold nanorods (Au NRs) and superparamagnetic iron oxide (Fe3O4) into polypyrrole was developed. Such a theranostic agent (referred to as Au/PPY@Fe3O4) not only exhibits strong magnetic property and high near-infrared (NIR) optical absorbance but also produces high contrast for magnetic resonance (MR) and X-ray computed tomography (CT) imaging. Importantly, under the irradiation of the NIR 808 nm laser at the power density of 2 W/cm2 for 10 min, the temperature of the solution containing Au/PPY@Fe3O4 (1.4 mg/mL) increased by about 35 °C. Cell viability assay showed that these nanocomposites had low cytotoxicity. Furthermore, an in vitro photothermal treatment test demonstrates that the cancer cells can be efficiently killed by the photothermal effects of the Au/PPY@Fe3O4 nanocomposites. In summary, this study demonstrates that the highly versatile multifunctional Au/PPY@Fe3O4 nanocomposites have great potential in simultaneous multimodal imaging-guided cancer theranostic applications.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Congli Wang,Lizhen Huang,Shengmei Song,Bassam Saif,Yehong Zhou,Chuan Dong,Shaomin Shuang
The β-cyclodextrin assemblied magnetic Fe 3 O 4 nanoparticles (β-CD-MNPs) were successfully fabricated via a layer-by-layer method. Possessing an average size 14 nm, good stability and super-paramagnetic response (Ms 64 emu/g), the resultant nanocomposites could be served as a versatile biocompatible platform for selective loading, targeted delivery and pH-responsive release of stereoisomeric doxorubicin (DOX) and epirubicin (EPI). 1 H-nuclear magnetic resonance ( 1 H NMR) and the computer simulation further give the evidence that partial anthracene ring of drug molecule is included by β-CD. In addition, non-toxic β-CD-MNPs have excellent biocompatibility on MCF-7 cells, and cellular uptake indicate that different amounts of DOX or EPI can be transported to targeting site and released from the internalized carriers. The results demonstrate that as-prepared β-CD-MNPs could be a very promising vehicle for DOX and EPI.
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高影响因子
DALTON TRANSACTIONS
·
2014
·Vol. 43
·期 48
·18056-18065
·
IF 4.097
Wei Guo,Chunyu Yang,Huiming Lin,Fengyu Qu
The Fe3O4@mSiO2 nanocarrier that consisted of a magnetic Fe3O4 nanoparticle core and a mesoporous silica (mSiO2) shell was synthesized. It shows a uniform sphere morphology about 65 nm in diameter. Considering the magnetic hyperthermia of Fe3O4 under an alternating magnetic field (AMF), a thermo-sensitive polymer, poly[(ethylene glycol)-co-(L-lactide)] (P(EO-co-LLA)), was used as “gatekeeper” coating outside Fe3O4@mSiO2 to regulate the drug release behavior. The design of the nanocarrier was expected to block off the pores at low temperature and to reopen them at high temperature reversibly. The obtained hybrid nanocomposites were capable of loading the anti-cancer drug doxorubicin (DOX) and controlled drug release behavior trigged by the hyperthermia of Fe3O4 under AMF. Besides, the nanocarriers also show pH-sensitive drug release based on the slight differences between the tumor (weakly acid) and the normal tissue (weakly alkaline). What's more, the chemotherapy of DOX combined with magnetic hyperthermia can improve the cytotoxicity obviously. On the basis of the high stability and excellent controlled release performance, the multifunctional nanocarriers exhibit potential applications in targeted-control drug release and hyperthermia for cancer treatment.
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PubMed
高影响因子
PLoS One
·
2014
·Vol. 9
·期 10
·e108647
·
IF 3.534
Yankai Du,Meishan Pei,Youjun He,Faqi Yu,Wenjuan Guo,Luyan Wang
Fe 3 O 4 (Fe 3 O 4 -CS) coated with magnetic chitosan was prepared as an adsorbent for the removal of Orange I from aqueous solutions and characterized by FTIR, XRD, SEM, TEM and TGA measurements. The effects of pH, initial concentration and contact time on the adsorption of Orange I from aqueous solutions were investigated. The decoloration rate was higher than 94% in the initial concentration range of 50–150 mg L −1 at pH 2.0. The maximum adsorption amount was 183.2 mg g −1 and was obtained at an initial concentration of 400 mg L −1 at pH 2.0. The adsorption equilibrium was reached in 30 minutes, demonstrating that the obtained adsorbent has the potential for practical application. The equilibrium adsorption isotherm was analyzed by the Freundlich and Langmuir models, and the adsorption kinetics were analyzed by the pseudo-first-order and pseudo-second-order kinetic models. The higher linear correlation coefficients showed that the Langmuir model (R 2 = 0.9995) and pseudo-second-order model (R 2 = 0.9561) offered the better fits.
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BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Qing Han,Xin Shen,Wanying Zhu,Chunhong Zhu,Xuemin Zhou,Huijun Jiang
A novel magnetic molecularly imprinted sensing film (MMISF) was fabricated for the determination of estradiol (E2) based on magnetic glassy carbon electrode (MGCE) and magnetic molecularly imprinted polymers (MMIPs). The MMIPs were synthesized by in situ polymerization of glutathione (GSH)-functionalized gold (Au)-coated Fe 3 O 4 (Fe 3 O 4 @Au-GSH) nanocomposites and aniline. The MMISF was constructed with MMIPs via a kind of “soft modification” where MMIPs were assembled and immobilized on the surface of MGCE or removed from it by freely installing a magnet into MGCE or not. The E2-MMIPs were obtained by MMIPs recognizing E2 from sample, and the electrochemical detection was carried out after forming the “soft modification” sensing film by putting MGCE into the E2-MMIPs suspension liquid. Afterwards, the “soft modification” MMISF was peeled off from the electrode by removing the magnet from MGCE. The interface of the electrode could be quickly refreshed through simple treatment for the next detection. The structures and morphologies of Fe 3 O 4 @Au-GSH, MMIPs and MMISF were investigated by Fourier transform infrared spectrometer, ultraviolet and visible spectrophotometer, scanning electron microscope and atomic force microscope . In addition, the MMISF was successfully used for detecting E2 in milk powder with good sensitivity, selectivity, reproducibility and efficiency. The linear range of the MMISF for E2 was 0.025–10.0 μmol L −1 with the limit of detection of 2.76 nmol L −1 ( S / N = 3).
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Zhi Zhu,Ziyang Lu,Dandan Wang,Xu Tang,Yongsheng Yan,Weidong Shi,Youshan Wang,Nailing Gao,Xin Yao,Hongjun Dong
A high-dispersed Ag/Fe 3 O 4 /g-C 3 N 4 composite photocatalyst is firstly synthesized by means of the selective photo-deposition technique. It exhibits the obvious improvement of photocatalytic activity and stability for degrading tetracycline besides retaining the recycled magnetic property. The enhanced photocatalytic activity originates from synergetic effect of Ag, Fe 3 O 4 and g-C 3 N 4 that improves light absorption capacity and separation efficiency of charge carriers. This work provides a promising approach to develop visible-light-response and recycled photocatalysts applied to antibiotic wastewater treatment .
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CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Guangyang Liu,Tengfei Li,Xin Yang,Yongxin She,Miao Wang,Jing Wang,Min Zhang,Shanshan Wang,Fen Jin,Maojun Jin,Hua Shao,Zejun Jiang,Hailong Yu
A novel fluorescence sensing strategy for determination of atrazine in tap water involving direct competition between atrazine and 5-(4,6-dichlorotriazinyl) aminofluorescein (5-DTAF), and which exploits magnetic molecularly imprinted polymer (MMIP), has been developed. The MMIP, based on Fe 3 O 4 -chitosan nanoparticles, was synthesized to recognize specific binding sites of atrazine. The recognition capability and selectivity of the MMIP for atrazine and other triazine herbicides was investigated. Under optimal conditions, the competitive reaction between 5-DTAF and atrazine was performed to permit quantitation. Fluorescence intensity changes at 515 nm was linearly related to the logarithm of the atrazine concentration for the range 2.32–185.4 μM. The detection limit for atrazine was 0.86 μM (S/N = 3) and recoveries were 77.6–115% in spiked tap water samples.
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JOURNAL OF RAMAN SPECTROSCOPY
·
2015
·Vol. 46
·期 5
·470-475
·
IF 2.671
Xianghu Tang,Ronglu Dong,Liangbao Yang,Jinhuai Liu
Au nanorods coated Fe3O4 (Fe 3 O 4 @NRs) microspheres were designed as functional surface-enhanced Raman scattering substrate with a feature of magnetic property and used for detection of pesticide residues that are annually used in agriculture by near-infrared (NIR) excitation. With this strategy, the Fe 3 O 4 microspheres were synthesized by hydrothermal method and surface functionalized with polyethylenimine, and then coated with Au nanorods densely. The Raman spectra were carried out by NIR excitation and 4-ATP was chosen as the probe molecule. The results showed a good SERS activity of the Fe 3 O 4 @NRs microspheres. Moreover, this substrate could be used for pesticide analysis by portable Raman spectrometer with NIR excitation. Especially, the microspheres could be transferred from pesticides contaminated fruits peel to specially cleaned glass slide with the aid of the external magnetic field, by which the strong fluorescence of the apple components can be avoided while performing the pesticide analysis of fruits peel. Copyright © 2015 John Wiley & Sons, Ltd.
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CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Lixin Zhou,Shengdong Pan,Xiaohong Chen,Yonggang Zhao,Baobo Zou,Micong Jin
A novel core–shell covalently functionalized Fe 3 O 4 coated SiO 2 decorated multi-walled carbon nanotubes (Fe 3 O 4 @SiO 2 –MWCNTs) adsorbent was synthesized and characterized by scanning electron microscopy, transmission electron microscopy, Fourier Transform Infrared Spectrum (FTIR), Thermogravimetry, X-ray diffraction and magnetic measurements. The pentachlorophenol (PCP) adsorption effect factors of initial concentration, contact time, solution pH and temperature were investigated in detail. It was found the absorption capacity was strongly depended on pH, and the maximum adsorption value for PCP (96.4 mg/g) was obtained at pH 2.5. The equilibrium was attained within 30 min, and the adsorption kinetics was better described by pseudo-second-order kinetic model. The data pointed out excellent fit to Freundlich isotherm model. Thermodynamic parameters such as standard enthalpy (Δ H θ ), standard entropy (Δ S θ ) and standard free energy (Δ G θ ) showed that the adsorption of PCP onto Fe 3 O 4 @SiO 2 –MWCNTs was spontaneous, endothermic and random within the temperature range of 288–318 K. The results indicate that the Fe 3 O 4 @SiO 2 –MWCNTs adsorbent is a potential low-cost effective material for PCP removal from contaminated wastewater.
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高影响因子
Journal of Physical Chemistry C
·
2015
·
IF 4.772
Xiaoyun Huo,Weiping Li,Jiujun Zhu,Lili Li,Ya Li,Laihui Luo,Yuejin Zhu
To obtain the dielectric material with high dielectric constant and high breakdown field, here a new composite material based on Fe3O4@BaTiO3 shell–core particles and polyvinylidene fluoride (PVDF) has been prepared. It is proved the Fe3O4@BaTiO3 particles are good fillers with low conductivity for the percolation effect, which induces high dielectric constant and low dielectric loss in the Fe3O4@BaTiO3/PVDF composite. The maximum dielectric constant is up to 3893, and dielectric loss is suppressed below 0.9. Moreover, the shell layer of Fe3O4 can be the trap and scattering centers to injected charges, so that the polarization saturation can be delayed to higher field. Thus, the released energy density of this composite can be enhanced greatly due to higher breakdown strength and lower energy loss.
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