Preparation method of alpha-Fe2O3 nanoparticles

A nanoparticle and anion technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of difficult industrial production, difficult control of conditions, serious environmental pollution, etc., to increase ionic strength, The effect of low cost and low energy consumption

Inactive Publication Date: 2015-05-27
LUOYANG NORMAL UNIV
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  • Abstract
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Problems solved by technology

[0004] The above methods have the disadvantages of relatively complex synthesis process, difficult control of conditions, high energy consumption, serious environmental pollution, and narrow application range, and are not easy for industrial production.

Method used

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  • Preparation method of alpha-Fe2O3 nanoparticles

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preparation example Construction

[0020] In the preparation method of the present invention, the mixing mode of the inorganic alkali dispersion solution and the iron dispersion solution determines the acid-base environment, particle environment and reaction intensity during the reaction. Since the reaction environment and reaction intensity will affect the local reaction system, the shape and particle size of the reaction product are determined. In the present invention, the inorganic alkali dispersion solution must be added dropwise to the iron source dispersion solution. If the addition is reversed, only amorphous iron oxide particles can be generated, and the particle size is relatively large. The concentration of iron particles in the iron source dispersion solution and the concentration of hydroxide ions in the inorganic alkali dispersion solution will affect the utilization rate and reaction intensity of the particles in the reaction. Generally, the concentration of iron particles is in the range of 0.01~...

Embodiment 1

[0023] 1. Add 4.8g ferric ammonium sulfate dodecahydrate with 75mL concentration to 1.5mol L -1 Na 2 SO 4 The solution is dispersed and dissolved, and stirred evenly to obtain NH 4 Fe(SO 4 ) 2 Dispersion solution, the concentration of iron ions in the dispersion solution is 0.133mol / L.

[0024] 2. Add 1.2g NaOH to 75 mL to a concentration of 1.5mol L -1 Na 2 SO 4 The solution is dispersed and dissolved, and stirred evenly to obtain a NaOH dispersion solution, and the concentration of sodium hydroxide in the dispersion solution is 0.399mol / L.

[0025] 3. Add NH 4 Fe(SO 4 ) 2 The dispersion solution was transferred to a three-necked flask, placed in a reflux device in a glycerin bath and heated to 60°C, and the NaOH dispersion solution was added to the NH 4 Fe(SO 4 ) 2 In the dispersion solution, a brown precipitate is formed, continue to stir and reflux for 5 hours, centrifuge, wash the precipitate with water, water-ethanol mixture, and absolute ethanol, and vacuum...

Embodiment 2

[0027] 1. Add 2.7g ferric chloride hexahydrate with 75mL concentration to 1.0mol L -1Disperse and dissolve the sodium chloride solution, and stir evenly to obtain a ferric chloride dispersion solution. The concentration of iron ions in the dispersion liquid is 0.133mol / L.

[0028] 2. Use 75 mL of 1.2 g of sodium hydroxide to a concentration of 1.0 mol L -1 Disperse and dissolve the sodium chloride solution, stir to obtain a sodium hydroxide dispersion solution, and the concentration of sodium hydroxide in the dispersion liquid is 0.399mol / L.

[0029] 3. Ferric chloride dispersion solution is transferred in the three-necked flask, is placed in the reflux device of glycerine bath and is heated to 80 ℃, under constantly stirring, sodium hydroxide dispersion solution is added in the middle of ferric chloride dispersion solution, has Brown precipitate is formed, continue to fully stir and reflux for 5 hours, centrifuge, wash the precipitate with water, water-ethanol mixture, a...

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Abstract

The invention relates to a preparation method of alpha-Fe2O3 nanoparticles. The preparation method comprises the following steps: dispersing and dissolving a ferrum source by using an inorganic salt solution to prepare a ferrum dispersing solution; dissolving inorganic alkali by using the inorganic salt solution to prepare an inorganic alkaline dispersed solution, wherein anions of the inorganic salt are equal to those of the ferrum source in quantity; firstly heating the ferrum source dispersed solution to 50-95 DEG C, dropwise adding the inorganic alkaline dispersed solution to the ferrum source dispersed solution under a stirring condition, and after addition, further stirring till brown precipitates generated by reaction are no long increased; and carrying out centrifugal separation on the precipitates and sequentially washing with water, a mixed liquid of water and ethanol and absolute ethyl alcohol, and then drying in vacuum to obtain the alpha-Fe2O3 nanoparticles. The reactants need not to be roasted again. The process is simple and the energy consumption is low. The prepared iron sesquioxide nanoparticles are brown nanoparticles which are in alpha-Fe2O3 configuration, wherein the crystal grains are 15-20nm and the specific surface area is 78-101m<2> / g.

Description

technical field [0001] The present invention relates to a kind of preparation method of inorganic non-metallic nano crystal material, specifically a kind of α-Fe 2 o 3 Methods for the preparation of nanoparticles. Background technique [0002] Nanoscale Fe 2 o 3 It is a widely used inorganic nanomaterial with stable chemical properties, high catalytic activity, good light resistance, weather resistance and UV shielding. In addition, nano-α-Fe 2 o 3 It also has semiconducting properties, and its conductance has certain sensitivity to external conditions such as temperature, humidity and gas. Nano Fe 2 o 3 It has a huge specific surface area and magnetic properties, so it is used as an antirust pigment and iron red and purple brown coloring pigments in the paint industry; it is used as a colorant for artificial marble, ground terrazzo, and wall paint in the construction industry; In the chemical industry, it is a catalyst and a raw material for the production of o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06B82Y30/00
Inventor 李冠峰胡少强李怡霖韩丽高一兰
Owner LUOYANG NORMAL UNIV
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