Porous iron oxide structured by nanocrystals and preparation method thereof

A technology of nano-iron oxide and iron oxide, which is applied in the direction of iron oxide, iron oxide/iron hydroxide, etc., can solve the problems of soft template method residue and hard template method preparation method, and achieve the effect of simple and controllable method

Inactive Publication Date: 2011-12-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation method of the hard template method is complicated, and the soft template method has residual problems in the removal

Method used

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  • Porous iron oxide structured by nanocrystals and preparation method thereof
  • Porous iron oxide structured by nanocrystals and preparation method thereof
  • Porous iron oxide structured by nanocrystals and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dissolve 1.47g of potassium oxalate in 40.0mL of deionized water and stir to make it evenly dispersed in the solution. The concentration of oxalate is 0.2mol / L; dissolve 3.14g of ammonium ferrous sulfate in 40.0mL of deionized water and stir to make it evenly Dispersed in the solution, the concentration of ferrous ammonium sulfate is 0.2mol / L. Then slowly add the potassium oxalate solution into the ferrous ammonium sulfate solution under constant stirring, the ratio of ferrous ions to oxalate ions is 1:1. After the reaction was completed, it was transferred to a 100 mL hydrothermal kettle, and reacted at 120° C. for 10 hours, and the obtained product was dried at 80° C. for 5 hours to obtain a strip-shaped precursor. figure 1 It is the XRD pattern of the precursor, which is consistent with the standard ferrous oxalate XRD data (JCPDS No. 23-0293), indicating that the crystalline phase of the precursor is ferrous oxalate. The dried precursor ferrous oxalate was placed i...

Embodiment 2

[0022] Dissolve 0.88g potassium oxalate in 40.0mL deionized water, stir to make it evenly dispersed in the solution, the concentration of oxalate is 0.12mol / L; dissolve 1.12g ferrous sulfate in 40.0mL deionized water, stir to make it evenly Dispersed in the solution, the concentration of ferrous sulfate is 0.1mol / L. Then slowly add the potassium oxalate solution into the ferrous sulfate solution under constant stirring, and the ratio of ferrous ions to oxalate ions is 1.2:1. After the reaction was completed, it was transferred to a 100 mL hydrothermal kettle and reacted at 100° C. for 12 hours, and the obtained product was dried at 80° C. for 5 hours to obtain a strip-shaped precursor. The dried precursor ferrous oxalate was placed in a muffle furnace, the temperature was raised to 600°C at a heating rate of 5°C / min and kept for 4 hours, and then slowly cooled to room temperature with the furnace temperature to obtain nanostructured porous iron oxide. The electron microscope ...

Embodiment 3

[0024] Dissolve 0.37g sodium oxalate in 40.0mL deionized water, stir to make it evenly dispersed in the solution, the concentration of oxalate is 0.05mol / L; dissolve 0.800g ammonium ferrous sulfate in 40.0mL deionized water, stir to make it Evenly dispersed in the solution, the concentration of ferrous ammonium sulfate is 0.05mol / L; then slowly add the sodium oxalate solution into the ferrous ammonium sulfate solution under continuous stirring, the content of ferrous ions and oxalate ions The volume ratio is 1:1. After the reaction was completed, it was transferred to a 100 mL hydrothermal kettle, and reacted at 80° C. for 8 hours, and the obtained product was dried at 80° C. for 5 hours to obtain a strip-shaped precursor. The dried precursor ferrous oxalate was placed in a muffle furnace, and the temperature was raised to 600°C at a heating rate of 2°C / min and kept for 4 hours, and then slowly cooled to room temperature with the furnace temperature to obtain nanostructured po...

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Abstract

The invention discloses a nanocrystalline porous iron oxide and a preparation method thereof. The hydrothermal reaction is carried out with an aqueous solution containing ferrous ions and an aqueous solution containing oxalate, and the precursor ferrous oxalate is first prepared, and the ferrous oxalate is a micron-scale strip shape; then the precursor ferrous oxalate is heat-treated, Porous iron oxide structured by nanocrystals is obtained. The porous iron oxide constructed by nano crystals in the present invention is composed of uniform nanoparticles and has a large specific surface area, which provides excellent conditions for the application of iron oxide. The outstanding advantage of the present invention is that the porous iron oxide obtained by the synthesis method has a regular strip-shaped macroscopic appearance, and the secondary particles that construct the porous structure are nanoparticles, which can meet the requirements of the iron oxide materials in the application fields such as electrode materials and catalytic materials. Specific surface area requirements. Moreover, the method provided by the invention is simple and controllable, and is easy to realize industrial production.

Description

technical field [0001] The invention relates to a transition metal oxide nano material and a preparation method of a porous material, in particular to a porous iron oxide constructed of nano crystals and a preparation method thereof. Background technique [0002] Iron oxide is an important transition metal oxide. It has been widely used in catalysis, dyes, magnetic materials, gas-sensitive materials and lithium-ion battery materials. It is also used as a synthetic γ-Fe 2 o 3 raw materials. Besides these conventional applications, porous iron oxide can also be used as a drug carrier. Among them, lithium-ion battery materials and gas-sensing materials are the most widely studied. Compared with micron-scale iron oxide, nano-scale iron oxide exhibits better electrical properties and stability in lithium-ion battery materials, because smaller particles can reduce the diffusion distance of lithium ions; and studies have found that nano-scale iron oxide The gas sensitivity of t...

Claims

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Application Information

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IPC IPC(8): C01G49/06
Inventor 岳林海司莉敏
Owner ZHEJIANG UNIV
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