No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
The silver-impregnated magnetite-silica (mag@silica-Ag) was synthesized as follows: firstly, the mag@silica (1 g) was stirred in 100 mL of silver nitrate (0.1 M) until the pH …
Herein, silica (SiO2) extracted from treated oil palm leaves ash (TOPLA) was coated over Fe3O4 (SiO2–Fe3O4) before surface modification using 3-aminopropyltriethoxysilane (AP–SiO2–Fe3O4). The AP–SiO2–Fe3O4 was further modified with glutaraldehyde for the chemical immobilisation of Candida rugosa lipase (CRL) on the surface of …
Assessment of different eco-efficient comminution process circuits to treat magnetite iron ore. Determination of the process operating costs and the capital costs for each process route. ... silica-rich magnetite ore was carried out, with the emphasis on comminution circuit options. The concentrator was assumed to be located within 100 km of a ...
The silica grade in the magnetite concentrate is normally limited to a maximum level of 0.55% SiO 2 in order to achieve the required chemical composition in the pelletizing process. In order to ...
The coprecipitation method is the most widely used process for magnetite nanoparticles synthesis because of the high yield of nanoparticles that can ... Nabizadeh R, Esrafili A, Rezaei KR (2016) Silica-coated magnetite nanoparticles core-shell spheres (Fe 3 O 4 @SiO 2) for natural organic matter removal. J Environ Health Sci Eng 14:21. https ...
An efficient recovery of magnetite particles of 400 500 mesh from a mixture of magnetite/silica particles has been investigated by imposing a balance between centrifugal and surface tensional forces on these particles in the presence of two immiscible liquids. The effect of centrifugal force, surface tensional force, density and size of particles on the overall …
In the current work, a magnetic and porous nanocarrier (Fe 3 O 4 @SiO 2 /MIL-100(Fe)) was prepared by synthesizing MIL-100(Fe) in the presence of magnetite-silica nanoparticles (Fe 3 O 4 @SiO 2).This nanocomposite was successfully used to deliver CIP. The magnetic nanocomposite was synthesized via a three-step procedure without the addition of …
• Magnetite pellet feed recovery from chalcopyrite dam copper otation tailings. • Process route comprises scalping screen, low eld rougher, and cleaner magnetic separations and silicates reverse cationic otation as recleaner step. • High-quality magnetite pellet feed reaching 68.00 wt% of Fe, 2.13 wt% of SiO 2, and 95.1 wt% of magnetite.
The antimicrobial activity of the magnetite/silica nanocomposites revealed that the increasing silica content increased the inhibition zones by 74%, 77%, and 143% in case of Gram-positive bacteria ...
The filtered silica particles were recovered from the gel layer by using a magnet to separate the magnetite-containing gel from the filtered silica particles. This magnetite-containing gel has ...
As a consequence it is highly feasible to find different articles reporting modified Stöber method to prepare silica coated magnetite nanoparticles [11, 12].The use of other catalysts was reported, for instance employing lysine or arginine instead of ammonia [13–15].Other common modifications include the use of surfactants in the reaction media aiming to restrict …
ABSTRACT: Magnetite nanoparticle coated silica (Fe 3 O 4 ... process, and the silica nanoparticle itself can be doped with organic dye to be made luminescent.15,23−25 The surface of
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. ...
Magnetite/silica nanocomposites were successfully synthesized using the sol–gel method. The formation of magnetite/silica was confirmed using the XRD, XRF, and FTIR …
In this research, synthesis of mercapto-silica coated magnetite using sodium silicate solution prepared from rice hull ash as the silica source has been developed in …
The silicic acid-deposited magnetite mimics silica in its GMP adsorption characteristics whilst magnetite deposited with silica using the TEOS method mimics …
Silica (SiO 2) has been considered an ideal material to protect magnetite due to its chemical stability, versatility of surface modifications, and slight decrease in the original magnetization [9].The deposition of SiO 2 prevents degradation of the MNP and functionalizes the surface with silanol groups (Si OH), which can be used as coupling agents for other specific …
Along these lines, the adsorption process is as yet an appropriate treatment system in light of a legitimate concern for scientists which results from being a simple operation and cost-effective than other methods ... The magnetite silica core-shell has been prepared as published earlier (Stöber et al. 1968; ...
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 Indonesia, while the a-SiO 2 …
In this study, we report on the synthesis, comprehensive structural study and magnetic characterisation of silica-coated magnetite-nanoparticle composites. The crystal …
Mining is facing a transformation in terms of environmental and social performance with improved mine management practices required [].For instance, it was proposed a methodology to generate geopolymer from iron ore tailings [], a fine material rich in silica, and it was presented a selective process route to recover uranium, rare earth elements, and heavy …
To get the controlled size and monodispersed silica nanoparticle is a popular topic since its broad applications are in a lot of fields such as biological medicine, military project, catalyst, and chip industry. The Stöber process was often used to prepare silica nanoparticle because of its low cost and easy operation. Here, the combined method of microchannel and …
It is a conventional Bayer's process for the silica extraction from the silicate-rich material. Previously, numerous researchers have reported silica extraction from fly ash by alkali-dissolution methods. ... Yantasee et al. synthesized magnetite, functionalized with thiol, with a size of 40 nm, and applied it for the remediation of Hg, Ag ...
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 ...
The mesoporous silica-coated magnetite nanoparticles (mag@silica) were synthesized using the following method. The magnetite nanoparticles (1.5 g) were dispersed in 200 mL of ethanol using ultrasounds for 30 min. Subsequently, 4.5 g of CTAB, 1200 mL of DI water, 1.5 g of ammonia solution, and 450 mL of ethanol were added to the dispersed solution.
Conclusions Magnetite/silica nanocomposites were successfully synthesized using the sol–gel method. The formation of magnetite/silica was confirmed using the XRD, XRF, and FTIR measurements. Based on SEM images, the particle size of the magnetite/silica nanocomposites was observed to be 21.3–30.0 nm.
Request PDF | Physico-Chemical Properties of Silica Coated Superparamagnetic Magnetite Nanoparticles Synthesized by Non-Seeded Process | The science of core-shell nanoparticles requires ...
The antimicrobial activity of the magnetite/silica nanocomposites revealed that the increasing silica content increased the inhibition zones by 74%, 77%, and 143% in case of Gram-positive bacteria ...
The support of magnetite over SBA15 mesoporous silica provides to the pollutant higher reaction surfaces, leading to an increasing of the kinetics. Moreover, since the bare magnetite nanoparticles without supporting may suffer problems related to stability or agglomeration, the immobilization over a porous surface enhances their properties, as ...
Spherical submicron-sized magnetite/silica nanocomposite: The magnetite nanoparticles with a size of ca. 10 nm were prepared according to the Massart method, and were surface-modified with carboxyethylsilanel: Material's saturation magnetization was as high as 7.5 emu/g-sample depending on the nanoparticles content [64] 12
