Synthesis and magnetic properties of prussian blue modified Fe nanoparticles (original) (raw)
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Magnetic properties of prussian blue modified Fe3O4 nanocubes
Journal of Physics and Chemistry of Solids, 2013
Size controlled cubic Fe 3 O 4 nanoparticles in the size range 90 to 10 nm were synthesized by varying the ferric ion concentration using oxidation method. A bimodal size distribution was found without ferric ion concentration and the monodispersity increased with higher concentration. The saturation magnetization decreased from 90 to 62 emu/g when the particle size is reduced to 10 nm. The Fe 3 O 4 nanoparticles with average particle sizes 10 and 90 nm were surface modified with prussian blue. The attachment of prussian blue with Fe 3 O 4 was found to depend on the concentration of HCl and the particle size. The saturation magnetization of prussian blue modified Fe 3 O 4 varied from 10 to 80 emu/g depending on the particle size. The increased tendency for the attachment of prussian blue with smaller particle size was explained based on the surface charge. The prussian blue modified magnetite nanoparticles could be used as a radiotoxin remover in detoxification applications.
Preparation of Fe 3 O 4 Nanoparticles and Removal of Methylene Blue through Adsorption
Journal of Physics: Conference Series, 2015
In this work, we studied the catalytic activity, structural properties, and behavior of a Fe 3 O 4 magnetic system. The Fe 3 O 4 nanoparticles were prepared by the thermal decomposition method. X-ray diffraction confirmed the presence of a structural Fe 3 O 4 phase, where acicular shape of the grains is shown. Transmission Mössbauer spectroscopy showed a wide distribution of particle sizes at room temperature, some of these present superparamagnetic behavior and are responsible of paramagnetic sites. The hysteresis loops obtained by the use of a vibrating sample magnetometer showed that these nanoparticles exhibit superparamagnetic behavior. However, the cycles present a significant contribution from a ferrimagnetic component at 2 K, which agrees with Mössbauer results. Through scanning electron microscopy, a tendency to the agglomeration of nanoparticles was observed. Nanoparticle activity in the degradation of methylene blue (MB) was studied through fluorescence spectroscopy, finding dye adsorption properties.
Prussian blue modified iron oxide magnetic nanoparticles and their high peroxidase-like activity
Journal of Materials Chemistry, 2010
Prussian blue (PB) modified g-Fe 2 O 3 magnetic nanoparticles (MNPs) featuring varying PB proportions were synthesized and characterized by TEM, FTIR, UV-vis, EDS, XRD and XPS. The magnetic properties and peroxidase-like catalytic activity of the synthesized nanoparticles were investigated. With increasing PB content, the magnetism could still maintain a high level. Peroxidase-like activity was enhanced as the PB proportion increased. Catalysis was found to follow Michaelis-Menten kinetics. The calculated kinetic parameters exhibited strong affinity with substrates and high catalytic activity, which are three orders of magnitudes larger than that for magnetite nanoparticles of similar size. Based on the high activity, an enzyme immunoassay model was established: staphylococcal protein A (SPA) was conjugated onto the surface of the nanoparticles to construct a new nanoprobe which was employed to detect IgG immobilized to 96-well plates. The results presented a linear absorbance enhancement with concentration of IgG, suggesting that PBMNPs serve as an inexpensive horseradish peroxidase (HRP) mimic enzyme with potential applications in bio-detection. 25-83272496 † Electronic supplementary information (ESI) available: (1) Tables for establishment of immunoassay and element ratio of iron and nitrogen (EDS results); (2) UV-vis spectra of PBMNPs before and after the color reaction. See
2015
The influence of dc magnetic field on some physical and catalytic properties of iron and platinum/iron nanoparticles is investigated. The nanoparticles are produced by a borohydride (BH) reduction process, as the dc magnetic field is applied during their synthesis. Structural differences between Fe powders are not observed. XRD and Mössbauer data show the presence of metallic iron and iron oxides (-Fe 2 O 3 /Fe 3 O 4). In the Pt-Fe powders fcc-Pt and iron oxide-hydroxides are identified. XPS investigations confirm the availability of the iron oxides and metallic Pt. Pt 2+ is identified too. A comparison of the XRD and the XPS data suggests the formation of core (metal)/shell (oxide) structure of the nanoparticles. Тhe samples untreated with magnetic field show better electrocatalytic activities in PEM water electrolysis compared to the treated nanoparticles. For Pt-Fe samples, in which the iron content is about 50%, the influence of the magnetic field is weak. The observed effect c...
Chemistry of Materials, 2005
Magnetite (Fe 3 O 4) nanoparticles modified with electroactive Prussian Blue (PB) were first synthesized by a simple chemical method. Transmission electronic microscopy showed that the average size of the sample was about 12 nm, and X-ray powder diffraction, X-ray photoelectron spectroscopy, Fouriertransform IR, and UV-vis spectra showed the spinel structure for the nanoparticles and confirmed the existence of PB on the surface of Fe 3 O 4. Magnetic properties of the sample were investigated by lowfield alternating current susceptibility and superconducting quantum interference device measurement; the results indicated that the superparamagnetic properties remain for the sample with almost immeasurable remanence and coercivity at room temperature, while the value of saturation magnetization (Ms) reduces, and the blocking temperature (T B) of PB modified Fe 3 O 4 is around 150 K, lower than that of the pure Fe 3 O 4 nanoparticles, so the interaction between the particles is decreased. More interesting, when at 5 K, the Ms of PB-modified Fe 3 O 4 is greatly larger than that at 300 K and shows ferromagnetic behavior. Furthermore, PB-modified Fe 3 O 4 nanoparticles have been immobilized on the surface of glassy carbon electrode and applied to construct a sensor, it showed two well-defined pairs of redox peaks and a dramatic catalysis for the reduction of H 2 O 2 , which might be exploited to develop a new type of biosensor without any mediator.
Scientific reports, 2018
Cost-effective water cleaning approaches using improved treatment technologies, for instance based on catalytic processes with high activity catalysts, are urgently needed. The aim of our study was to synthesize efficient Fenton-like photo-catalysts for rapid degradation of persistent organic micropollutants in aqueous medium. Iron-based nanomaterials were chemically synthesized through simple procedures by immobilization of either iron(II) oxalate (FeO) or iron(III) citrate (FeC) on magnetite (M) nanoparticles stabilized with polyethylene glycol (PEG). Various investigation techniques were performed in order to characterize the freshly prepared catalysts. By applying advanced oxidation processes, the effect of catalyst dosage, hydrogen peroxide concentration and UV-A light exposure were examined for Bisphenol A (BPA) conversion, at laboratory scale, in mild conditions. The obtained results revealed that BPA degradation was rapidly enhanced in the presence of low-concentration HO, a...
Iron Oxide Nanoparticles: Synthesis, Characterization and Applications
2017
Iron oxide is a mineral compound which occurs in different forms like hematite, magnetite and maghemite. Fe-based nanoparticles act as new generation environmental remediation technologies, and provide cost-effective solutions to the most demanding environmental cleanup problems. The synthesis of magnetic iron oxide nanoparticles (IONPs) has been intensively developed not only for its fundamental scientific interest but also for its many technological applications, such as targeted drug delivery, magnetic resonance imaging (MRI), gas sensing, photocatalytic degradation of organic pollutant, etc. In this review, different methods like sol-gel, co-precipitation, micro-emulsion, thermal decomposition to prepare iron oxide nanoparticles have been described. Characterization of iron oxide nanoparticles is done by scanning electron microscopy(SEM), Transmission electron microscopy(TEM), X-ray powder diffraction(XRD), and Fourier transform infrared spectroscopy(FT-IR). Also various applica...