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Magnetic carbon-coated iron carbide nano material as well as preparation method and application thereof

A technology of carbon-coated iron carbide and nanomaterials, which is applied in the fields of magnetic materials, carbon preparation/purification, chemical instruments and methods, etc., and can solve problems such as high cost and long process flow

Inactive Publication Date: 2020-02-18
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides a magnetic carbon-coated iron carbide nanomaterial and its preparation method and application, which are used to solve the problem that the preparation of the existing magnetic carbon-coated iron carbide nanomaterial needs to use iron salt, and the preparation of iron salt A large amount of acid and alkali needs to be used, the process is longer and the cost is higher

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  • Magnetic carbon-coated iron carbide nano material as well as preparation method and application thereof
  • Magnetic carbon-coated iron carbide nano material as well as preparation method and application thereof
  • Magnetic carbon-coated iron carbide nano material as well as preparation method and application thereof

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preparation example Construction

[0043] A preparation method of magnetic carbon-coated iron carbide nanomaterials, comprising the following steps:

[0044] a) heating the iron source, the polycarboxy complex and the alkali source in water to obtain an intermediate product;

[0045] b) drying the intermediate product to obtain a complex precursor, and then roasting the complex precursor at 550° C. to 800° C. in an inert atmosphere to obtain a magnetic carbon-coated iron carbide nanomaterial;

[0046] Wherein, the iron source is selected from one or more of magnetite, ferrous oxide, ferric oxide and reduced iron powder, more preferably magnetite and / or ferric oxide;

[0047] The molar ratio of the iron element in the iron source to the carboxyl group in the polycarboxylate complex is 1:3-1:10, more preferably 1:4-1:5.

[0048] In the embodiment of the present invention, the alkali source can be used as a catalyst to promote the dissolution of the iron source in water. First, the polycarboxy complex reacts with...

Embodiment 1

[0077] In this embodiment, different calcination temperatures are used to prepare magnetic carbon-coated iron carbide nanomaterials, specifically including:

[0078] Weigh 1.836g magnetite and 15g citric acid (C 6 h 8 o 7 ) placed in 50ml deionized water, adding concentrated ammonia water to adjust the pH value to 2, heating and reacting at 100°C until the iron source is completely dissolved (67% to 83% of the magnetite mass), then filtering, and collecting the filtrate to obtain an intermediate product.

[0079] Dry the intermediate product at 60°C for 120 hours to obtain a brown-black fluffy complex precursor, and then roast the complex precursor at 500°C, 550°C, 600°C, 700°C and 800°C in a nitrogen atmosphere For 12 hours, the heating rate before calcination was 1° C. / min, and a magnetic carbon-coated iron carbide nanomaterial was obtained.

[0080] The magnetic carbon-coated iron carbide nanomaterial prepared in this embodiment is subjected to XRD analysis, and the resu...

Embodiment 2

[0084] In this embodiment, magnetic carbon-coated iron carbide nanomaterials are prepared, and the molar ratios of iron element and citric acid in magnetite are different, specifically including:

[0085]Weigh 0.918g of magnetite and 5.00g of citric acid and 0.918g of magnetite according to the molar ratio of iron element and citric acid in magnetite being 1:2, 1:3, 1:4, 1:5, 1:8 respectively. g and 7.50g citric acid, magnetite 0.918g and 10.00g citric acid, magnetite 0.918g and 12.50g citric acid, and magnetite 0.918g and 20g citric acid, respectively placed in 50ml deionized water, adding hydroxide Adjust the pH value to 5 with sodium, heat the reaction at 40°C until the iron source is completely dissolved (67%-83% of the magnetite mass), then filter, and collect the filtrate to obtain an intermediate product.

[0086] The intermediate product was dried at 170°C for 12 hours to obtain a brown-black fluffy complex precursor, and then the complex precursor was roasted at 700°C...

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Abstract

The invention belongs to the technical field of carbon materials, and particularly relates to a magnetic carbon-coated iron carbide nano material as well as a preparation method and an application thereof. In the preparation method disclosed by the invention, an iron source is selected from one or more of magnetite, ferrous oxide, ferroferric oxide and reduced iron powder; an alkali source can beused as a catalyst to promote dissolution of the iron source in water; a polycarboxyl complex and the alkali source are subjected to a reaction to generate polycarboxyl complex ions; the polycarboxylcomplexing ions are subjected to a complexing reaction with the iron source; an iron element in the iron source is extracted and dissolved in water to obtain a complex precursor; the complex precursoris roasted in an inert atmosphere for pyrolysis self-reduction to obtain the magnetic carbon-coated iron carbide nano material; iron salt does not need to be used as an iron source, and the problemsthat iron salt needs to be used for preparing a conventional magnetic carbon-coated iron carbide nano material, a large amount of acid and alkali needs to be adopted for preparing the iron salt, the technological process is long, and the cost is high are solved.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, and in particular relates to a magnetic carbon-coated iron carbide nanometer material and a preparation method and application thereof. Background technique [0002] As a carbon material, magnetic carbon-wrapped iron carbide nanomaterials have broad application prospects in many fields such as microwave absorption, hydrogenation catalysis, catalyst supports, and energy storage. The uniform dispersion of nano-sized iron carbide particles in the carbon layer makes the magnetic carbon-wrapped iron carbide nanomaterials have high performance and stability. On the one hand, the function of nano-sized iron carbide particles can be fully exerted; The outer carbon layer can not only isolate the nanoparticles to prevent them from agglomerating at high temperature and improve their thermal stability, but also avoid the corrosion of iron carbide by the acid-base environment by adjusting the wrappin...

Claims

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Application Information

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IPC IPC(8): C01B32/914C01B32/05B01J27/22B01J32/00H01F1/00H01F41/00
CPCC01B32/914C01B32/05B01J27/22H01F1/0054H01F41/00C01P2004/80C01P2004/04C01P2006/42B01J35/23
Inventor 王铁军仇松柏张浅古桔文
Owner GUANGDONG UNIV OF TECH
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