SENSORS AND ACTUATORS B-CHEMICAL
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2013
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IF 3.535
Ling Chen,Jinhua Li,Shasha Wang,Wenhui Lu,Aiguo Wu,Jaebum Choo,Lingxin Chen
A sensing strategy for chromogenic detection of molecular biothiols has been proposed based on fluorescein isothiocyanate (FITC) functionalized magnetic core–shell Fe 3 O 4 /Ag hybrid nanoparticles. Ag coated magnetic Fe 3 O 4 nanoparticles were initially synthetized. FITC was subsequently conjugated on the surface of core–shell nanoparticles by Ag–SCN linkage and then the fluorescence of FITC was quenched. Upon addition of molecular biothiols, since the Ag S bond is stronger than Ag–SCN, a place-displacement between thiols and FITC would occur and thereby the fluorescence of FITC would recover. Thus, a fluorescence “off-on” probe was attained by virtue of biothiols, so after magnetic separation, the fluorescence signal change of FITC in clear solution could be employed for quantitative determination of typical molecular biothiols such as glutathione (GSH) and cysteine (Cys). High sensitivity was obtained with the detection limits of 10 nM and 20 nM for GSH and Cys, respectively. As well as, the assay strategy presented excellent selectivity toward molecular biothiols against other amino acids. Furthermore, confocal imaging was achieved in living cells, indicating that this fluorescent probe is potentially applicable for imaging molecular thiols in biological systems.
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CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Ran-ran Shan,Liang-guo Yan,Kun Yang,Shu-jun Yu,Yuan-feng Hao,Hai-qin Yu,Bin Du
Magnetic material as adsorbent can provide effective remove and quickly separate of pollutant in wastewater treatment. A magnetic Fe 3 O 4 /MgAl-layered double hydroxide (LDH) composite was prepared by low saturation coprecipitation in the dispersed Fe 3 O 4 suspension. The characterization of XRD, TEM and FTIR revealed that the Fe 3 O 4 /MgAl-LDH composite was combined with Fe 3 O 4 and MgAl-LDH. This provided the composite of magnetic property which improved the separation of solid from aqueous solution. The adsorption of reactive red (RR), congo red (CR) and acid red 1 (AR1) by magnetic Fe 3 O 4 /MgAl-LDH composite depended upon the adsorbent dosage, contact time, initial concentration and temperature. The adsorption of the three red dyes reached equilibrium at 30 min and followed the pseudo-second-order kinetic equation. The equilibrium adsorption isotherm data well fitted the Langmuir model for RR, Freundlich model for CR and AR1. Thermodynamic results demonstrated that the adsorption processes were spontaneous, endothermic for RR and CR or exothermic for AR1. The adsorption capacities changed insignificantly between solution pH 2–10 and the maximum were 97, 253 and 92 mg/g for RR, CR and AR1, respectively. Moreover, the solid composite can be quickly separated from the aqueous solution by an external magnet before and after adsorption process. This indicated that the magnetic Fe 3 O 4 /MgAl-LDH composite was an effective adsorbent for red dyes removal with quick separation.
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APPLIED SURFACE SCIENCE
·
2014
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IF 2.538
Shaonan Lv,Yubei Song,Yaya Song,Zhigang Zhao,Changjing Cheng
Herein, we report a facile method to prepare beta-cyclodextrin (β-CD)-conjugated magnetic Fe 3 O 4 colloidal nanocrystal clusters (Fe 3 O 4 @GLY-CD) using (3-glycidyloxypropyl) trimethoxysilane (GLY) as the intermediate linker. The resulting Fe 3 O 4 @GLY-CD was characterized by several methods including Fourier transform infrared (FT-IR) spectroscopy, field-emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), dynamic light scattering (DLS), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and vibrating sample magnetometer (VSM). In addition, the loading and release properties of the synthesized Fe 3 O 4 @GLY-CD for the hydrophobic molecule 8-anilino-1-naphthalenesulfonic acid ammonium salt (ANS) were also investigated. The results show that the Fe 3 O 4 @GLY-CD has a spherical structure with an average diameter of 186 nm and high saturated magnetism of 51.2 emu/g. The grafting of β-CD onto Fe 3 O 4 colloidal nanocrystal clusters can markedly increase the loading capacity of ANS because of β-CD/ANS inclusion complex formation. The in vitro delivery profile shows that the release of ANS from the Fe 3 O 4 @GLY-CD nanosystem exhibits an initial burst followed by a slow and steady release. Moreover, Fe 3 O 4 @GLY-CD also demonstrates a temperature-dependent release behavior for ANS owing to the effect of temperature on the association constants of β-CD/ANS inclusion complexes. The developed magnetic hybrid nanomaterial is expected to find potential applications in several fields including separation science and biomedicine.
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CATALYSIS COMMUNICATIONS
·
2013
·
IF 2.915
Jie Cui,Ting He,Xu Zhang
Platinum ion doped magnetic TiO 2 (Fe 3 O 4 @SiO 2 @Pt ion –TiO 2 ) hybrid microspheres with uniform magnetic cores were synthesized and characterized in this work. The results indicate that the photoactivity of Fe 3 O 4 @SiO 2 @Pt ion –TiO 2 is much higher than Fe 3 O 4 @SiO 2 @TiO 2 for the decolorization of acid orange 20 under UV–visible light irradiation. The trend for the final degradation ratio with Fe 3 O 4 @SiO 2 @Pt ion –TiO 2 is quite small, even after seven repetitive experiments. These data indicate that the magnetic microspheres possess the potential to be effective and stable catalysts. The results demonstrate that the Pt ion doped magnetic catalyst meets the needs for both immobilization and high photoactivity.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2013
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IF 2.108
Yi Yang,Xiao Chen,Dandan Huang,Wei Ye
Being considered as building blocks, the inorganic nanodimer particles such as Ag-Fe 3 O 4 , Cd-Se and Pt-Fe 3 O 4 , have attracted much attention because of their capability of dual surface functionalization and potential applications in field-emission, data storage and photovoltaic devices. For these motivations and as a continuation of our previous study, a gel with flower-like morphology based on Ag-Fe 3 O 4 nanodimers has been constructed with the carboxylated cyclodextrin (MAH-CD) and Pluronic F127 molecules in mixed solvent of cyclohexane and water. The morphology of Ag-Fe 3 O 4 nanodimers and structure of MAH-CD were characterized by transmission electron microscopy (TEM) and nuclear magnetic resonance (NMR) respectively. The mechanism of gel formation is discussed along with the data obtained from rheological measurement, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), Fourier transformation infrared spectroscopy (FTIR) and X-ray diffraction (XRD). Each Ag-Fe 3 O 4 particle was coated by lots of MAH-CD molecules, which were threaded by F127 chains. The gel fabrication is controlled by the inclusion of MAH-CD with F127, the interaction between the carboxyl group and the Fe 3 O 4 surface. The cyclohexane molecules in gel were trapped with F127 by cyclodextrin, which may be packed orderly through hydrogen bond. Meanwhile, the Fe 3 O 4 side of nanodimers provides the anchoring position for carboxyl group to induce the formation of gel. Such an Ag-Fe 3 O 4 nanodimer initiated gel can be used either based on Ag side for catalytic and sensing properties, or based on superparamagnetism from Fe 3 O 4 side.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2014
·
IF 2.354
Yaohui Xu,Yang Zhou,Ruixing Li
An available route was provided for simultaneous detection and effective adsorption toward Cd 2+ , Zn 2+ and Cu 2+ . The magnetic Fe 3 O 4 @SiO 2 nanoparticles were prepared and functionalized with N-(quinoline-8-yl)-2-(3-triethoxysilyl-propylamino)-acetamide (QTPA) by first using the “grafting from” method, which made the whole process of surface modification on Fe 3 O 4 @SiO 2 nanoparticles simpler and more effective. The as-synthesized QTPA functionalized Fe 3 O 4 @SiO 2 nanoparticles exhibited different fluorescence responses for Cd 2+ (doderblue), Zn 2+ (deepskyblue) and Cu 2+ (tomato red) illuminated under a 365 nm UV light, while other ions, such as Ag + , Hg 2+ , Ni 2+ , Co 2+ , Mn 2+ , Pb 2+ , Cr 3+ and Fe 3+ , gave no visible changes under identical experimental conditions. The eye-perceived fluorescent changes only toward Cd 2+ , Zn 2+ and Cu 2+ could serve as the available proofs for the qualitative analysis of the three cations. The UV–vis spectra results showed that the multifunctional nanoparticles exhibited fluorescence enhancements for Cd 2+ and Zn 2+ , and fluorescence quenching for Cu 2+ . The adsorption experiments showed that the nanomaterial was a good candidate for selective removal and enrichment of Cd 2+ , Zn 2+ and Cu 2+ , and had the high adsorption efficiency toward Cd 2+ (95.29%), Zn 2+ (92.37%), and Cu 2+ (91.06%). Moreover, the functionalized composites had strong magnetic sensitivity, which could make them susceptible in an external magnetic field, and easy to separate from the solid and liquid phase. More specific to this work, simultaneous fluorescence determination of Cd 2+ , Cu 2+ , and Zn 2+ by naked eye was proposed based on QTPA functionalized Fe 3 O 4 @SiO 2 nanoparticles.
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Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 22
·11847-11856
·
IF 7.443
Yu Jiang,Zhong-Jie Jiang,Lufeng Yang,Shuang Cheng,Meilin Liu
The encapsulation of transition metal oxide (TMO) particles in a graphene hollow shell to form a core-void-shell structure is an attractive way to improve the electrochemical performance of TMO-based electrodes for lithium ion batteries (LIBs). First, the continuous graphene shell may enhance the electrical conductivity of the electrodes and thus facilitate current collection and charge transfer associated with lithium storage. Second, the unique shell structure may suppress the aggregation of the core TMO particles while the void space between the core and shell may accommodate the large volume changes of the core during charge–discharge cycling, which enhances electrode stability against cycling. Third, the high specific surface area may improve the accessibility of active electrode materials to the electrolyte, which could effectively reduce the solid-state diffusion length and thus enhance Li ion transport and rate capability. When tested in a LIB, a Fe3O4@rGO composite electrode exhibits an initial reversible capacity of 1236.6 mA h g−1, which is much higher than that of an electrode based on bare Fe3O4, a physical mixture of Fe3O4 and graphene, or other forms of Fe3O4 reported in the literature. In addition, the cycling performance and rate capacity are also much better. The results clearly demonstrate that this unique electrode architecture is ideally suited for LIBs and other electrochemical energy storage and conversion devices.
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ACS Applied Materials & Interfaces
·
2014
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IF 5.9
Yang Wang,Guangchuan Wang,Yun Xiao,Yuling Yang,Ruikang Tang
Recent developments of nanotechnology encourage novel materials for facile separations and purifications of recombinant proteins, which are of great importance in disease diagnoses and treatments. We find that Fe3O4@NiSiO3 with yolk–shell nanostructure can be used to specifically purify histidine-tagged (His-tagged) proteins from mixtures of lysed cells with a recyclable process. Each individual nanoparticle composes by a mesoporous nickel silicate shell and a magnetic Fe3O4 core in the hollow inner, which is featured by its great loading efficiency and rapid response toward magnetic fields. The abundant Ni2+ cations on the shell provide docking sites for selective coordination of histidine and the reversible release is induced by excess imidazole solution. Because of the Fe3O4 cores, the separation, concentration, and recycling of the nanocomposites become feasible under the controls of magnets. These characteristics would be highly beneficial in nanoparticle-based biomedical applications for targeted-drug delivery and biosensors.
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PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2014
·Vol. 73
·期 2
·299-305
·
IF 1.547
Wang Zhen-Zhen,Zhai Shang-Ru,Zhang Feng,Xiao Zuo-Yi,Zhai Bin,An Qing-Da
This work presented a novel, facile, cost-effective and environmentally friendly approach for the preparation of magnetic core–shell structured catalyst i.e. Fe 3 O 4 @SN–Ag (abbreviation of Fe 3 O 4 @SiO 2 –NH 2 –Ag). During the process of preparation, Ag nanoparticles were in situ generated with amino groups in the surface of Fe 3 O 4 @SN serving as green reductant and stabilizer in the absence of any additional toxic reductant or organic reagent. Magnetic core, Fe 3 O 4 , was easily prepared through solvothermal method. The subsequent coating and surface amino functionalization of SiO 2 was accomplished via one-pot sol–gel method, which was green and time-saving. What’s more, the resulting catalyst exhibited excellent catalytic property (the reaction was finished within 2 min) and reusability (reused at least seven times) in the reduction of 4-nitrophenol.
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MATERIALS RESEARCH BULLETIN
·
2015
·
IF 2.288
Yue Yang,Yanrong Zhao,Shihan Sun,Xueyu Zhang,Lianfeng Duan,Xin Ge,Wei Lü
3D composite hydrogels composed of graphene sheets and Fe 3 O 4 nanoparticles (G/Fe 3 O 4 ) were prepared via a simple hydrothermal method. The composite has an interconnected 3D porous network, and the Fe 3 O 4 nanoparticles with the size of ∼13 nm are uniformly dispersed onto the graphene sheets. Due to the synergistic effects of the assembled graphene sheets and Fe 3 O 4 nanoparticles, the resultant G/Fe 3 O 4 exhibited efficient adsorption for organic pollutant using Rhodamine B as the adsorbate and electromagnetic wave absorption. The maximum removal ratio of Rhodamine B was 99.6%, and the G/Fe 3 O 4 hydrogel demonstrated wide and strong wave absorption achieved in the frequency range of 2–20 GHz. Present work shows a way to design and prepare lightweight and high performance materials for both electromagnetic wave absorption and wastewater treatment based on 3D graphene and Fe 3 O 4 nanomaterials.
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2015
·Vol. 2015
·期 10
·1692-1699
·
IF 2.942
Zhen-Zhen Wang,Shang-Ru Zhai,Bin Zhai,Qing-Da An
Graphical An Fe 3 O 4 /Cu nanocatalyst that exhibits excellent catalytic performance in the degradation of 4-nitrophenol (4-NP) (the reaction was accomplished within 4 min), rhodamine B (within 3 min), and methylene blue (within 1 min) as well as superior stability (can be reused at least five times) was successfully synthesized through a green one-step solvothermal method with ethylene glycol as reductant and reaction media. Noble-metal-derived functional materials have played indispensable roles in the reduction of dye under aqueous conditions; however, their cost and separation are great limitations on their wider practical applications. Therefore, an alternative preparation of comparable materials with low cost and good ease of separation is required. Herein magnetic microspheres (i.e., Fe 3 O 4 /Cu) were synthesized through a green single-step solvothermal method for the first time with ethylene glycol serving as reductant and reaction media. The prepared materials were characterized by means of powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectrometry, a vibrating sample magnetometer, and so forth. Additionally, by employing the reduction of 4-nitrophenol to 4-aminophenol as a model reaction, the effects of preparation time and the initial dosage of Cu(NO 3 ) 2 on the rate constant of the catalytic reduction reaction were systematically investigated. Moreover, the obtained hybrid nanocatalysts were also applied to reduce and degrade common organic dyes (rhodamine B and methylene blue) in the presence of NaBH 4 . Quite significantly, it was shown that it could catalytically degrade different organic dyes with excellent catalytic performance and high stability in recycled reactions up to five times. More interestingly, the material can be easily separated from the catalytic system for further use.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2015
·
IF 3.368
Manlin Wang,Peng Liu,Yu Wang,Dongmei Zhou,Chen Ma,Dongju Zhang,Jinhua Zhan
The effective recognition and enrichment of trace polychlorinated biphenyls (PCBs) in the environment are currently challenging issues due to human health concerns. In this paper, a surface absorptive layer coating superparamagnetic Fe 3 O 4 nanoparticles for PCBs enrichment were prepared. This protocol involved the synthesis of Fe 3 O 4 particles through a solvothermal reaction and the covering of a silica layer bonded β-cyclodextrin (β-CD) over Fe 3 O 4 via a sol–gel process to construct core–shell Fe 3 O 4 @β-CD composites. β-CD was linked covalently to Fe 3 O 4 nanoparticles to generate the binding sites, enhancing the stability of Fe 3 O 4 nanoparticles in water. Meanwhile, superparamagnetic Fe 3 O 4 core could be rapidly separated from matrix to simplify time-consuming washing extraction. The adsorption capacity of Fe 3 O 4 @β-CD composites to PCB28 and PCB52 in aqueous solutions was investigated. To estimate the theoretical binding site number of Fe 3 O 4 @β-CD, the obtained binding data were replotted according to Scatchard equation. The host–guest interaction between β-CD and PCBs were further examined with density functional theory (DFT) calculations. It provides theoretical evidence of β-CD as host molecule has a higher binding amount towards PCB-28 than PCB-52 on the basis of their optimized geometries and calculated complexation energies. The nanomaterial reported herein is an ideal candidate for various applications, including the recognition and removal of environmentally deleterious substances.
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