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Preparation method for gamma-iron trioxide/rGO composite material having flower-like microsphere structure

A technology of ferric oxide and composite materials, applied in the direction of catalyst activation/preparation, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve the problem of reduced active sites, high specific surface energy, and easy agglomeration and other problems, to achieve the effects of easy access, increased specific surface area, and uniform particle size distribution

Active Publication Date: 2018-08-14
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the small particle size and high specific surface energy of a single metal oxide, the particles are easily agglomerated, thereby reducing the active sites on the surface

Method used

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  • Preparation method for gamma-iron trioxide/rGO composite material having flower-like microsphere structure
  • Preparation method for gamma-iron trioxide/rGO composite material having flower-like microsphere structure
  • Preparation method for gamma-iron trioxide/rGO composite material having flower-like microsphere structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Weigh 0.248g of ferric nitrate nonahydrate and dissolve it in 10mL of ethylene glycol, and stir magnetically for 30min;

[0027] (2) Sodium hydroxide is added to water to obtain a 5mol / L aqueous sodium hydroxide solution, and the 5mol / L aqueous sodium hydroxide solution is slowly added dropwise to the solution obtained in step 1, and the stirring is continued for 30min;

[0028] (3) After stirring, transfer the reaction solution into a 25mL hydrothermal kettle, and react at 150-180°C for 12-18 hours;

[0029] (4) After the reaction, naturally cool to room temperature, centrifuge and wash, and air-dry at 200° C. for 12 hours to obtain product 1.

[0030] (5) The solvent volume ratio required for the reaction is: ethylene glycol: water = 2:1.

Embodiment 2

[0032] (1) Weigh 5 mg of graphene oxide in 10 mL of ethylene glycol, and ultrasonically disperse at 600 W for 2 to 3 hours until a brown-yellow transparent suspension is formed;

[0033] (2) Take by weighing 0.248g ferric nitrate nonahydrate in the suspension liquid of step (1) gained, magnetic stirring 30min;

[0034] (3) Sodium hydroxide is added in water, obtains the aqueous sodium hydroxide solution of 5mol / L, the aqueous sodium hydroxide solution (the volume of water is 5mL) of 5mol / L is slowly added dropwise in the solution of step (2) gained, After dropping, continue to stir for 30min to obtain the reaction solution;

[0035] (4) Transfer the reaction solution into a 25mL hydrothermal kettle, and react at 150°C for 12h;

[0036] (5) After the reaction, naturally cool to room temperature, centrifuge and wash, and blow dry at 200°C for 12 hours to obtain the flower-shaped microsphere structure γ-Fe2O3 / rGO composite material, namely product 2 (marked as Fe 2 o 3 / rGO-0....

Embodiment 3

[0038] (1) Weigh 20 mg of graphene oxide in 10 mL of ethylene glycol, and ultrasonically disperse at 600 W for 2 to 3 hours until a brown-yellow transparent suspension is formed;

[0039] (2) Take by weighing 0.248g ferric nitrate nonahydrate in the suspension liquid of step (1) gained, magnetic stirring 30min;

[0040] (3) Sodium hydroxide is added in water, obtains the aqueous sodium hydroxide solution of 5mol / L, the aqueous sodium hydroxide solution (the volume of water is 5mL) of 5mol / L is slowly added dropwise in the solution of step (2) gained, Continue stirring for 30min after dropping to obtain the reaction solution;

[0041] (4) After stirring, transfer the reaction liquid into a 25mL hydrothermal kettle, and react at 150°C for 12h;

[0042] (5) After the reaction, naturally cool to room temperature, centrifuge and wash, and blow dry at 200°C for 12 hours to obtain the γ-Fe2O3 / rGO composite material with flower-like microsphere structure, namely product 3 (marked as ...

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Abstract

The invention provides a preparation method for a gamma-iron trioxide / rGO composite material having a flower-like microsphere structure. The method comprises the following steps: adding a soluble ironsalt into an ethylene glycol solution of graphene oxide, performing uniform stirring, adding a sodium hydroxide aqueous solution dropwise, after adding is finished, performing stirring for 30 min, performing a reaction at the temperature of 150-180 DEG C for 12-18 h, performing washing, and performing drying at the temperature of 200 DEG C for 12 h to obtain the gamma-iron trioxide / rGO compositematerial having the flower-like microsphere structure. According to the method provided by the invention, the surface of iron oxide in the product has a large number of void structures, the special structure significantly increases the specific surface area and reaction active sites, and electron transfer and proton conduction are more facilitated in the process of catalytic pyrolysis of energeticcomponents; and the Fe2O3 / rGO composite material provided by the invention can be used as a combustion catalyst, and has an excellent catalytic effect on energetic material hexanitrohexaazaisowurtzitane (HNIW).

Description

technical field [0001] The invention belongs to the technical field of preparation of nanocomposite materials, and relates to a method for preparing gamma-ferric oxide / rGO composite materials with a flower-like microsphere structure. Background technique [0002] At present, with the continuous development of solid propulsion technology, high energy, insensitivity, high burning rate, and low pressure index have become decisive indicators for evaluating the comprehensive application performance of propellants. To meet the requirements of propulsion technology, new types of combustion catalysts need to be developed. The study found that the catalytic effect of a single metal oxide as a combustion catalyst is significantly worse than that of a composite combustion catalyst. [0003] As a new type of carbon nanomaterial with high specific surface area, graphene has excellent conductivity and mechanical properties. It can be used as a catalyst in the field of propellants, and i...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J37/34B01J37/10B82Y30/00B82Y40/00C06B23/00C06D5/00
CPCB01J23/745B01J37/10B01J37/343B82Y30/00B82Y40/00C06B23/007C06D5/00
Inventor 张婷马海霞郭兆琦郭雨安亭赵凤起
Owner NORTHWEST UNIV
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