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Magnetite nanoparticle coated silica (Fe 3 O 4 @SiO 2) hybrid nanomaterials hold an important position in the fields of cell imaging and drug delivery.Here we report a large …
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Magnetite (Fe 3 O 4) nanoparticles and amorphous-silica-coated magnetite-nanoparticle (Fe 3 O 4 /a-SiO 2) composites have successfully been synthesised using co-precipitation and modified Stöber methods, respectively.Instead of using a commercial product, the Fe 3 O 4 powder was synthesised via co-precipitation method from local ironstone in …
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A theoretical design study for a for high capacity processing of a hard, fine grained silica rich magnetite ore, with several circuit options was carried out to assess the energy efficiency ...
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A continuous process for manufacture of magnesite and silica from olivine, CO 2 and H2 O. Author links open overlay panel Ingrid Anne Munz a, Jand Kihle a, ... Whereas silica has a prograde solubility independent of CO 2 pressure, the magnesite solubility is retrograde and pH dependent. If forsterite dissolves at low temperature, i.e. below the ...
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This study demonstrates the successful synthesis of sulfosalicylic acid-functionalized silica-coated magnetic nanoparticles, referred to as MNPs-SSA, as a reusable …
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Magnetite and silica-coated magnetite (Fe3O4) nanoparticles (NPs) were synthesized by water-in-oil (W/O) microemulsion method from hydrated ferric nitrate, ferrous …
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The coating process of Fe 3 O 4 magnetite nano-particles was conducted by mixing the solution of 60 ml of aquadest, 240 ml of ethanol and 7.5 ml of ammonia (18%). ... The coating of silica on the magnetite nano-particles using tetraethyl orthosilicate (TEOS) variations for ferro-lubricant application have been conducted. ...
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The silica-magnetite particles were then washed once with 2 L of TMA solution at pH 10.0, and then five times with 2 L of deionised H 2 O by magnetic sedimentation. The pH …
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Adsorbent synthesis from Chaetoceros sp. biomass with silica-magnetite coating technique (ASMC) and without magnetite (ASC) has been performed through the sol-gel process. Both adsorbents were characterized by infrared spectrophotometer, X-Ray diffraction and scanning electron microscopy. The adsorption process of Cu(II) ions was performed in a single and …
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The liquid foodstuffs such as edible oil products remain a problem of excessive aflatoxin B1 (AFB1) content. This paper focused on the preparation of magnetic mesoporous silica (MMS) from rice husk ash for the removal of AFB1 in oil system. The MMS preparation process, adsorption conditions, structural characteristics, and adsorption mechanism were …
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Phenol hydroxylation involves the oxidation of phenol (C6H5OH) using hydrogen peroxide (H2O2) to yield benzenediol (C6H4(OH)2), mainly catechol (CTL) …
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of a low-silica taconite concentrate by coke or coal using an industrial microwave generator. Maurao et al.14) investi-gated the carbothermic reduction of composite pellets con-taining a hematite iron ore, coke or charcoal as carbona-ceous material. Nagata et al.15) showed that pig iron was ob-tained from magnetite ore–coal composite pellets ...
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This paper describes an improved approach for the coating of superparamagnetic magnetite nanoparticles with shells of amorphous silica. Magnetite (Fe 3 O 4) nanoparticles are prepared by partial reduction coprecipitation method and modified by adding citric acid.The silica coating is conveniently controlled by a dilute silicate solution pretreatment and subsequent …
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The adsorption of iodine onto silica coated magnetite nanoparticles (im-SCMNPs) that modified with imidazole was investigated for removal of high concentrations of iodine from wastewater. Modified silica magnetite nanoparticles showed high efficiency in removing iodine from wastewater samples. The optimum pH for iodine removal was 7.0–8.0. The adsorption …
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The HYL process is designed for the conversion of pellet / lump ore into metallic iron in a solid-gas moving bed reactor (shaft furnace), where oxygen is removed from the iron ore by reduction via syngas (H 2 and CO) or hydrogen. The process is a shaft furnace-based reduction also featuring: Pelletised feed.
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The generation of hydrogen during serpentinization, which accompanies the formation of magnetite, involves a silica-depletion reaction, as evidenced by the low abundance of serpentine in the magnetite-bearing veins and the absence of magnetite in pseudomorphs of orthopyroxene. ... For the second stage of the process of serpentinization, a ...
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Feature papers represent the most advanced research with significant potential for high impact in the field. A Feature Paper should be a substantial original Article that involves several techniques or approaches, provides an outlook for future research directions and describes possible research applications.
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Results of characterization indicated that mercapto-silica has been coated magnetite particle with a simple one-pot process that promises the prospective application of Fe3O4-SiO2-SH in the future such as for separation and removal of heavy metal ions from aquatic environments. In this research, mercapto-silica coated magnetite (Fe3O4-SiO2-SH) …
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2. Synthesis of Magnetite-Silica Core/Shell Structures The most stated synthesis method for magnetite-silica core/shell nanostructures is the Stöber sol-gel method, which is a chemical synthesis route used to prepare silica shells of controllable and uniform size over the magnetite nanoparticle acting as a core [71].
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The proposed approach concerned three steps: the preparation of magnetite (Fe3O4) nanoparticles by co-precipitation method, then of silica using sodium silicate prepared …
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Silica and magnetite have been recognized as emerging and effective environmentally-friendly pollutant removers. In this study, the effectiveness of silica/magnetite (SM) composites derived from local beach sand were developed and evaluated as an environmentally friendly adsorbent for taking up tetracycline from water. The formation of SM
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In fig.3, the UV-visible spectrum of magnetite-silica nanoparticles loaded with is displayed. A prominent hump at 657 nm corresponds to the molecule's typical absorption in water. Fig. 3.UV-Visible spectrum of (a) added magnetite-silica nanoparticles and (b) magnetite-silica nanoparticles. 3.4 Morphological study 3.4.1 TEM analysis
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Introduction. Nanoparticles (NPs) comprising a magnetic iron oxide core encapsulated in an appropriate organic or inorganic coat have been successfully used in a wide range of …
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We developed a new one-pot synthesis method for silica coated magnetite nanoparticles by way of a cheap- modified polyol process. In this reaction, polyethylene glycol was used as a solvent media ...
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Magnetite (Fe 3 O 4) nanoparticles and amorphous-silica-coated magnetite-nanoparticle (Fe 3 O 4 /a-SiO 2) composites have successfully been synthesised using co-precipitation and modified Stöber methods, respectively.Instead of using a commercial …
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1. Introduction. High-silica granite (SiO 2 > 70 wt%) commonly locates at the top of magmatic pluton (Lee et al., 2015).Understanding the formation of high-silica granite is important, because it is an important carrier of incompatible elements and commonly associated with rhyolite eruption (Bachmann and Bergantz, 2004, Bachmann and Bergantz, 2008).
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We developed a new one-pot synthesis method for silica coated magnetite nanoparticles by way of a cheap- modified polyol process. In this reaction, polyethylene glycol was used as a solvent media ...
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The proposed approach concerned three steps: the preparation of magnetite (Fe3O4) nanoparticles by co-precipitation method, then of silica using sodium silicate prepared from silica sand, and ...
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The observed difference of pHIEP in KCl solution for pure silica (2.0), magnetite (5.0), and silica-coated magnetite (2.3) samples confirms that the coating process was effective since the charge surface properties of coated magnetic nanoparticles are close to that of pure silica, even though the Fourier-transform infrared spectra did not ...
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Producing an eco-friendly fuel with the least amount of sulfur compounds has been an ongoing issue for petroleum refineries. In this study, bentonite (which is a cheap material and is locally available in abundance) is employed to prepare a nano-silica catalyst with a high surface area to be used for the oxidative desulfurization of kerosene. Two composite catalysts …
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