Method for preparing Ca2Fe2O5 nano powder

A technology of ca2fe2o5 and nanopowder, which is applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of difficult control of the process from sol to gel, long calcination temperature and holding time, unfavorable energy saving and environmental protection, etc. Achieve the effects of cheap raw materials, lower calcination temperature and good crystallization performance

Inactive Publication Date: 2013-06-12
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the co-precipitation method may introduce impurities into the powder, and in the preparation of Ca 2 Fe 2 o 5 When the calcination temperature and holding time are relatively long, it is not conducive to energy saving and environmental protection
The powder purity obtained by the sol-gel method is higher than that of the previous two methods, but the sol-gel method also has certain defects, such as the process from the sol to the gel is not easy to control, resulting in CaFe 2 o 4 The production, the experiment cycle is long, and the process is complicated, it is not easy to operate

Method used

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  • Method for preparing Ca2Fe2O5 nano powder
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  • Method for preparing Ca2Fe2O5 nano powder

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Embodiment 1

[0023] 1) Prepare ferric nitrate and calcium nitrate with a concentration of 0.5mol / L and calcium nitrate with a concentration of 0.5mol / L in a 250ml volumetric flask, respectively;

[0024] 2) Pipette 20mL of ferric nitrate solution and 20mL of calcium nitrate solution and mix evenly to obtain mixed solution A; wherein, the molar ratio of iron ions to calcium ions in mixed solution A is 1:1;

[0025] 3) According to the propulsion chemistry theory, add glycine as a combustion accelerant to mixed solution A, and stir evenly with a magnetic stirrer for 10 minutes to obtain mixed solution B; wherein, the amount of glycine added is the ferric nitrate and 1.5 times the total molar weight of calcium nitrate;

[0026] 4) Put the mixed solution B into the muffle furnace and heat it to 150°C to obtain a dark brown fluffy primary powder, then grind the dark brown fluffy primary powder evenly, and then heat it to 700°C in the muffle furnace Heat preservation and roasting for 0.5h to ob...

Embodiment 2

[0028] 1) Prepare ferric nitrate and calcium nitrate with a concentration of 0.1mol / L and calcium nitrate with a concentration of 0.1mol / L in a 250ml volumetric flask, respectively;

[0029] 2) Pipette 20mL of ferric nitrate solution and 20mL of calcium nitrate solution and mix evenly to obtain mixed solution A; wherein, the molar ratio of iron ions to calcium ions in mixed solution A is 1:1;

[0030] 3) According to the propulsion chemistry theory, add glycine as a combustion accelerant to mixed solution A, and stir evenly with a magnetic stirrer for 10 minutes to obtain mixed solution B; wherein, the amount of glycine added is the ferric nitrate and 2.8 times the total molar weight of calcium nitrate;

[0031] 4) Put the mixed solution B into the muffle furnace and heat it to 200°C to obtain a dark brown fluffy primary powder, then grind the dark brown fluffy primary powder evenly, and then heat it to 600°C in the muffle furnace Heat preservation and roasting for 1.0h to ob...

Embodiment 3

[0036] 1) Prepare ferric nitrate and calcium nitrate with a concentration of 0.2 mol / L and 0.2 mol / L calcium nitrate in a 250ml volumetric flask, respectively;

[0037] 2) Pipette 20mL of ferric nitrate solution and 20mL of calcium nitrate solution and mix evenly to obtain mixed solution A; wherein, the molar ratio of iron ions to calcium ions in mixed solution A is 1:1;

[0038] 3) According to the propulsion chemistry theory, add glycine as a combustion accelerant to mixed solution A, and stir evenly with a magnetic stirrer for 10 minutes to obtain mixed solution B; wherein, the amount of glycine added is the ferric nitrate and 2.0 times the total molar weight of calcium nitrate;

[0039] 4) Heat the mixed solution B to 200°C in a muffle furnace and keep it warm for 1 hour to obtain a dark brown fluffy primary powder, then grind the dark brown fluffy primary powder evenly, and then heat it in the muffle furnace Roast at 500°C for 1.0h to obtain dark brown Ca 2 Fe 2 o 5 N...

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Abstract

The invention provides a method for preparing Ca2Fe2O5 nano powder, which comprises the following steps: evenly mixing an iron nitrate solution and a calcium nitrate solution to obtain a mixed solution A; and adding glycine into the mixed solution A according to the propellant chemistry theory, sending into a muffle furnace, heating to 100-300 DEG C to carry out self-propagating reaction to obtain deep-brown fluffy primary powder, and roasting at 100-300 DEG C to obtain the Ca2Fe2O5 nano powder. The invention has the advantages of cheaper raw materials and simple technological operation; the roasting temperature is obviously lowered, thereby being beneficial to energy saving and environmental protection; and the glycine used as a combustion improver is non-toxic and harmless, thereby ensuring the health and safety of operating personnel. The Ca2Fe2O5 nano powder prepared by the method provided by the invention has the advantages of high purity, small and uniform particle size and favorable crystallinity, and can be used as a photocatalyst for degrading organic pollutants or as a cathode material for solid fuel cells.

Description

technical field [0001] The invention relates to a method for preparing nano powder, in particular to a method for preparing Ca 2 Fe 2 o 5 nanopowder method. Background technique [0002] In recent years, andorite structure compounds have attracted extensive attention from material researchers because of their special crystal structure and excellent physical and chemical properties. A 2 B 2 o 5 Perovskite-type oxides are structurally similar to perovskite-type oxides, which can be regarded as a perovskite structure formed by overlapping B-O octahedral layers and B-O tetrahedral layers. This kind of material has shown good performance in electricity, magnetism, and photocatalysis, so it has become a hot spot in material research. Ca 2 Fe 2 o 5 As a representative of andorite-type compounds, it has a good crystal structure and high photocatalytic activity. Studies have shown that the band gap of iron-containing compounds is generally between 1.9-2.3eV, indicating tha...

Claims

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Application Information

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IPC IPC(8): C01G49/00B82Y30/00
CPCY02P20/10
Inventor 王芬王静朱建锋
Owner SHAANXI UNIV OF SCI & TECH
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