Method for preparing spindle shaped alpha-Fe2O3 powder

A nano-powder, spindle-shaped technology is applied in the field of preparation of spindle-shaped α-Fe2O3 nano-powder, which can solve the problem of uneven size of nano-powder ellipsoid particles, and achieve stable product quality, easy control, and excellent catalytic performance. Effect

Inactive Publication Date: 2008-10-29
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the prepared α-Fe 2 o 3 The spindle-shaped and ellipsoidal particles of nano-powders are uneven in size

Method used

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  • Method for preparing spindle shaped alpha-Fe2O3 powder
  • Method for preparing spindle shaped alpha-Fe2O3 powder
  • Method for preparing spindle shaped alpha-Fe2O3 powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Water / Solvothermal Synthesis of Spindle α-Fe 2 o 3 Nano powder, the particle length is 400 nanometers, and the maximum diameter is 200 nanometers.

[0022] Synthesize spindle-shaped α-Fe according to the following process steps 2 o 3 Nano powder.

[0023] 1) Measure ethylene glycol and deionized water at a volume ratio of 20:20, respectively, and stir and mix them for 30 minutes to obtain a mixed solvent with a volume ratio of ethylene glycol and water of 20:20.

[0024] 2) Weigh 0.005mol (2.05g) iron nitrate (Fe(NO 3 ) 3 9H 2 O) it is dissolved in the mixed solvent of ethylene glycol and water prepared in front of 20ml, and the iron nitrate liquid concentration that is formed is adjusted to be: 0.25mol / L (mole per liter).

[0025] 3) According to the molar ratio of ferric nitrate and potassium hydroxide as 1:3, measure and weigh potassium hydroxide (KOH), that is, weigh 0.015mol (1.03g) KOH, dissolve it in 20ml of ethylene glycol and water prepared earlier In t...

Embodiment 2

[0031] Water / Solvothermal Synthesis of Spindle α-Fe 2 o 3 Nano powder, the spindle particle length is 200 nanometers, the maximum diameter is 100 nanometers, and the aspect ratio is 2:1.

[0032]Concrete processing step is identical with example 1, and difference is: the volume ratio of ethylene glycol and water in the mixed solvent of preparation in step 1) is: 22: 18; Step 2) takes by weighing 0.001875mol ferric nitrate, and the ferric nitrate of preparation The concentration of the solution is: 0.1mol / L, correspondingly weigh 0.005625mol potassium hydroxide in step 3), and the concentration of the prepared potassium hydroxide solution is: 0.3mol / L; the reaction precursor is suspended in the final reaction kettle in step 4) The liquid accounts for 3 / 4 of the volume of the reactor, and the Fe in the suspension 3+ The molar volume fraction of ions and KOH is: 0.15mol / L. Then stir for 5 minutes. In step 5), the heat treatment temperature is 160° C., and the temperature is k...

Embodiment 3

[0034] Water / solvothermal synthesis of α-Fe with hexagonal disc-like particles 2 o 3 The nano powder has a particle length of 500 nanometers, a maximum diameter of 250 nanometers, and an aspect ratio of 2:1.

[0035] Concrete process step is identical with example 1, and difference is: the volume ratio of ethylene glycol and water in the mixed solvent of preparation in step 1) is: 14: 26; Step 2) takes by weighing 0.00833mol ferric nitrate, and the ferric nitrate of preparation The concentration of the solution is: 0.5mol / L, correspondingly weigh 0.025mol potassium hydroxide in step 3), and the concentration of the prepared potassium hydroxide solution is: 1.5mol / L; the reaction precursor is suspended in the final reactor in step 4) The liquid accounts for 2 / 3 of the volume of the reactor, and the molar volume fraction of Fe3+ ions and KOH in the suspension is: 0.75mol / L. Then stir for 60 minutes. In step 5), the heat treatment temperature is 240°C. The synthesized α-Fe 2...

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Abstract

The invention relates to a preparation method of a fusiform nanometer powder of alpha-Fe2O3. A water or solvent thermal synthesis is used for respectively dissolving an original reaction material, ferric nitrate and a mineralizer, potassium hydroxide into a mixed solvent which is composed of ethylene glycol and water; then a potassium hydroxide solution is added drop by drop into a ferric nitrate solution to get a suspension liquid precursor which is used for the water or solvent thermal reaction; the suspension liquid precursor is sealed into a reactor and is processed by heat treatment for 4 hours to 36 hours at the temperature of 160 DEG C to 240 DEG C to get the fusiform nanometer powder of alpha-Fe2O3; the length of the kernel is not less than 200 nanometers and the largest diameter is not less than 100 nanometers. The products of the invention have the advantages of stable quality, high purity, good particle dispersion and excellent catalyzing property; the preparation process is simple and easy to control, has the advantages of no pollution and low cost and is easy for mass production.

Description

technical field [0001] The invention relates to a spindle-shaped α-Fe 2 o 3 The invention relates to a preparation method of nanometer powder, which belongs to the field of inorganic non-metallic materials. Background technique [0002] Compared with their corresponding bulk materials, nanomaterials often exhibit more excellent physical and chemical properties. Research on nanomaterials in recent years has proved that the properties of nanopowder materials are not only affected by their nanometer size, but also their particle shape often plays a decisive role. Nano-iron oxide materials not only have more excellent magnetic and catalytic properties, but also have good transparency and UV absorption and shielding effects, so as catalysts, magnetic media, and pigments, they are used in gas desulfurization, wastewater treatment, and magnetic storage, ink, Plastics, leather, automotive finishes and biomedical engineering are widely used. Among them, nano-α-Fe 2 o 3 As a cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06B82B3/00
Inventor 徐刚韩高荣任召辉张怡翁文剑杜丕一赵高凌张溪文程逵沈鸽
Owner ZHEJIANG UNIV
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