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Method for preparing graphene loaded ferroferric oxide magnetic nanometer particle composite material

A technology of magnetic nanoparticles and ferroferric oxide, which is applied in the direction of material electrochemical variables, electrodes, electrolysis process, etc., can solve the problems of time-consuming and labor-intensive preparation and purification, easy degradation, and the variability of natural enzymes, etc., and achieve excellent electrocatalytic activity , Particle distribution is uniform, the effect of uniform distribution

Inactive Publication Date: 2011-01-12
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported that Fe 3 o 4 Magnetic nanoparticles have peroxide-like activity, and can be used as a peroxide mimic enzyme to replace natural enzymes, solving the shortcomings of natural enzymes such as variability, easy degradation, and time-consuming and laborious preparation and purification.

Method used

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  • Method for preparing graphene loaded ferroferric oxide magnetic nanometer particle composite material
  • Method for preparing graphene loaded ferroferric oxide magnetic nanometer particle composite material
  • Method for preparing graphene loaded ferroferric oxide magnetic nanometer particle composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0033]Get graphite powder and sodium nitrate, then add glacial sulfuric acid with a concentration of 98wt% and stir evenly, then put it in an ice bath, slowly add potassium permanganate while stirring, at this time, the temperature is always kept below 20°C, and then heat up to 35±5°C and keep warm for 1~2h. After the reaction, slowly add deionized water, raise the temperature to 85~95°C, keep warm for 15min, then add 10ml of hydrogen peroxide and deionized water with a mass fraction of 30%. Centrifugal, 5wt% HCl wash, dry, grind, finally obtain graphite oxide powder; Wherein the mass ratio of graphite powder and sodium nitrate is 2: 1, the ratio of glacial sulfuric acid and graphite powder is 23ml / mg, potassium permanganate and graphite The mass ratio of powder is 3:1, the volume ratio of deionized water and concentrated sulfuric acid added for the first time is 2:1, and the volume ratio of deionized water and concentrated sulfuric acid added for the second time is 6:1.

[00...

Embodiment 2

[0036] Weigh 220mg of graphite oxide (commercially available) and add it to a beaker, then add 220ml of deionized water, ultrasonically disperse for 80min, then centrifuge to remove unflaked graphite flakes to obtain an aqueous solution of graphene oxide, pour the solution into a three-necked flask, and add 2.2ml of mass The fraction is 85% hydrazine hydrate and 0.11g SDBS, magnetically stirred and heated to 110°C, condensed and refluxed for 22h. After the reaction, dry the modified graphene dispersion and add water to 50ml, ultrasonically disperse, centrifuge to remove large particles in the solution, and then pour it into a three-necked flask. Then weigh 0.3784g of ferric chloride and 0.1391g of ferrous chloride tetrahydrate in 50ml of deionized water, feed nitrogen to the aqueous solution for 20min, and then add Fe 3+ and Fe 2+ The aqueous solution of the mixture was poured into the above-mentioned graphene dispersion liquid, and after ultrasonic stirring for 10 min, 8M am...

Embodiment 3

[0038] Weigh 240mg of pre-prepared graphite oxide and add it to a beaker, then add 240ml of deionized water, ultrasonically disperse for 100min, and then centrifuge to remove unexfoliated graphite flakes to obtain an aqueous solution of graphene oxide, pour the solution into a three-necked flask, and add 2.4ml of mass fraction 85% hydrazine hydrate and 0.12gPSS, magnetically stirred and heated to 120°C, condensed and refluxed for 24h. After the reaction, dry the modified graphene dispersion and add water to 50ml, ultrasonically disperse, centrifuge to remove large particles in the solution, and then pour it into a three-necked flask. Then take by weighing 0.4865g ferric chloride and 0.1789g ferrous chloride tetrahydrate in 50ml deionized water, feed nitrogen into the aqueous solution for 30min, and then add Fe 3+ and Fe 2+ The aqueous solution of the mixture was poured into the above-mentioned graphene dispersion liquid, and after ultrasonic stirring for 10 min, 8M ammonia so...

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Abstract

The invention relates to a method for preparing a graphene loaded ferroferric oxide magnetic nanometer particle composite material. The method comprises the following steps of: (1) dispersing graphite oxide into deionized water, pouring into a vessel after ultrasonic and centrifuging, putting the vessel into an oil-bath pan, adding hydrazine hydrate and an anionic surfactant for heating, condensing and refluxing, and cooling and drying to obtain modified graphene; and (2) dispersing the graphene into aqueous solution, and ultrasonically stirring and centrifuging to obtain modified graphene dispersion liquid; and weighing a soluble trivalent ferric salt and divalent ferric salt, dissolving the salt into the deionized water, introducing nitrogen, pouring into the modified graphene dispersion liquid, dripping ammonia after uniform ultrasonic stirring, heating for reaction, washing and collecting a product, and drying the product. The method is simple and easy for industrial production; and the prepared composite material has the advantages of pure crystal phase, uniform distribution and excellent electrocatalytic activity.

Description

technical field [0001] The invention belongs to the field of preparation of ferroferric oxide magnetic nano particle composite material, and in particular relates to a preparation method of graphene-loaded ferroferric oxide magnetic nano particle composite material. Background technique [0002] Graphene is a new carbonaceous material that is tightly packed into a two-dimensional honeycomb lattice structure by a single layer of carbon atoms. It is the basic unit for building zero-dimensional fullerenes, one-dimensional carbon nanotubes, and three-dimensional graphite. Its excellent electrical properties , thermal, mechanical and electrochemical properties, it is expected to be widely used in the fields of high-performance nanoelectronic devices, composite materials, field emission materials, electrochemical sensors and energy storage. Therefore, since Geim discovered graphene in 2004, graphene It has quickly become one of the research hotspots in the field of materials scien...

Claims

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Application Information

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IPC IPC(8): C04B35/52C04B35/622C25B11/12G01N27/30
Inventor 李耀刚张燕玲王宏志张青红
Owner DONGHUA UNIV
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