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Method for preparing carbon coated iron-cementite magnetic nanopaticles

A magnetic nanoparticle, iron carbide technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology for material and surface science, can solve the problems of low particle crystallization, poor stability, low purity, etc. Removal, good stability, the effect of meeting performance requirements

Inactive Publication Date: 2019-02-15
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: provide the preparation method of the iron-iron carbide magnetic nanoparticle of carbon coating, obtain the mixed solution of ferric citrate and potassium bromide evenly distributed on the potassium bromide carrier by freeze-drying technology The iron citrate particles on the surface as the iron metal source are calcined to obtain the iron oxide-potassium bromide catalyst precursor, and then the magnetic nanoparticles are prepared by chemical vapor deposition. The outer layer is a carbon layer, and the core is iron and iron carbide The carbon-coated iron-triiron carbide magnetic nanoparticle product that constitutes the core overcomes the low purity of the prepared carbon-coated iron nanoparticles, poor particle dispersibility and poor controllability of particle size in the prior art , low degree of crystallization of particles, poor stability and poor overall performance

Method used

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  • Method for preparing carbon coated iron-cementite magnetic nanopaticles
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  • Method for preparing carbon coated iron-cementite magnetic nanopaticles

Examples

Experimental program
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Effect test

Embodiment 1

[0054] The first step is to prepare the iron oxide-potassium bromide catalyst precursor:

[0055] First, the ferric citrate pentahydrate aqueous solution with a mass percentage concentration of 3% and the potassium bromide aqueous solution with a mass percentage concentration of 10.03% are mixed to form a mixed solution, ensuring that the mass ratio of iron to potassium bromide is 0.05: 1, using magnetic heating The stirrer heated and stirred the above mixed solution at 70°C at a speed of 500rpm for 4h, then transferred it to a plastic test tube and placed it in a freeze drying oven, and cooled it down to -50°C at a cooling rate of 20°C / min, and the above mixed solution was frozen into After the solid state, continue to dry in a freeze-drying box under a vacuum of 1.3Pa for 48h, then take out the ferric citrate particles obtained after freeze-drying and evenly distributed on the surface of the potassium bromide carrier as the iron metal source from the plastic test tube, use th...

Embodiment 2

[0061] The first step is to prepare the iron oxide-potassium bromide catalyst precursor:

[0062] First, the ferric citrate pentahydrate aqueous solution with a mass percentage concentration of 2% and the potassium bromide aqueous solution with a mass percentage concentration of 11.14% are mixed to form a mixed solution, ensuring that the mass ratio of iron to potassium bromide is 0.03:1, and using magnetic heating The stirrer heated and stirred the above mixed solution at 60°C at a speed of 400rpm for 3h, then transferred it to a plastic test tube and placed it in a freeze-drying oven, and cooled it down to -30°C at a cooling rate of 15°C / min, and the above mixed solution was frozen into After the solid state, continue to dry in a freeze-drying box under a vacuum of 8 Pa for 36 hours, then take out the ferric citrate particles obtained after freeze-drying and evenly distributed on the surface of the potassium bromide carrier as an iron metal source from the plastic test tube, ...

Embodiment 3

[0073] The first step is to prepare the iron oxide-potassium bromide catalyst precursor:

[0074] First, the ferric citrate pentahydrate aqueous solution with a mass percentage concentration of 1% and the potassium bromide aqueous solution with a mass percentage concentration of 16.7% are mixed to form a mixed solution, ensuring that the mass ratio of iron to potassium bromide is 0.01: 1, using magnetic heating The stirrer heated and stirred the above mixed solution at 50°C at a speed of 300rpm for 2h, then transferred it to a plastic test tube and placed it in a freeze-drying oven, and cooled it down to -10°C at a cooling rate of 5°C / min, and the above mixed solution was frozen into After the solid state, continue to dry in a freeze-drying box under a vacuum of 13.0Pa for 24h, then take out the ferric citrate particles obtained after freeze-drying and evenly distributed on the surface of the potassium bromide carrier as an iron metal source from the plastic test tube, and use ...

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Abstract

The invention relates to an iron-containing catalyst, in particular to a method for preparing carbon coated iron-cementite magnetic nanopaticles. According to the method, by means of a mixed solutionof ferric citrate and potassium bromide, ferric citrate particles which are evenly distributed on the surface of a potassium bromide carrier and serves as an iron metal source are obtained through thefreeze drying technology, and a ferric oxide-potassium bromide catalyst precursor is obtained through calcining; and then the carbon coated iron-cementite magnetic nanopaticle products with a carbonlayer as an outer layer and iron and cementite forming a core are prepared through a chemical vapor deposition method. The defects that in the prior art, the prepared carbon coated iron nanoparticlesare low in purity, poor in particle dispersity and particle size controllability, low in particle crystallization degree, poor in stability and not good in overall performance are overcome.

Description

technical field [0001] The technical solution of the present invention relates to a catalyst containing iron, specifically a method for preparing carbon-coated iron-triferrocarbide magnetic nanoparticles. Background technique [0002] Carbon-encapsulated magnetic nanoparticles (CEMNPs) have good electrochemical properties, optical properties, magnetic properties, adsorption properties and good biocompatibility, and are widely used in the fields of electricity, magnetism, photocatalysis and biomedicine. There are huge application prospects. Therefore, in recent years, this new type of nanocomposite material has aroused widespread interest of researchers and launched a series of research work. There are many types of carbon-coated magnetic nanoparticles. Among them, the carbon-coated iron-iron carbide magnetic nanoparticles are iron-iron carbide nano-cores and tightly surrounding cores obtained by the dissolution and precipitation of iron nanoparticles. carbon layer composit...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F9/26C23C16/26B82Y30/00B82Y40/00
CPCC23C16/26B82Y30/00B82Y40/00B22F9/26B22F1/16
Inventor 李海鹏赵利新戴西斌孙雪宇李超杰
Owner HEBEI UNIV OF TECH
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