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Method for preparing flaky nano CoO or Co3O4 through assistant microwave heating

A nano-sheet, microwave heating technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of complex synthesis methods and cumbersome post-processing, and achieve simple process flow and post-processing. Simple and short preparation cycle

Active Publication Date: 2016-01-27
江西省钨与稀土产品质量监督检验中心(江西省钨与稀土研究院)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] CoO, Co 3 o 4 The shape of the material, such as nano-cubic, spherical, nano-fiber, and polygonal nano-nails, etc., but the synthesis method is complicated and the post-processing is cumbersome

Method used

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  • Method for preparing flaky nano CoO or Co3O4 through assistant microwave heating

Examples

Experimental program
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Effect test

Embodiment 1

[0018] (1) Add 0.04molCo(NO 3 ) 2 ·6H 2 O was dissolved in 200mL of deionized water to form a cobalt salt solution, and 20mg of ascorbic acid was added to the cobalt salt solution; 2mL of 25% concentrated ammonia water was dissolved in 38mL of deionized water to form a 40mL ammonia solution, and then 0.08molNaOH was added to the ammonia solution , to obtain NaOH-ammonia mixed alkali solution.

[0019] (2) At room temperature, evenly pour the NaOH-ammonia mixed alkali solution into the cobalt salt aqueous solution stirred at a constant speed at a flow rate of 1000mL / min. After the mixed alkali solution is completely added, microwave heating at 60°C and stir for 50 minutes.

[0020] (3) After the microwave reaction is completed, age the co-precipitate for 5 minutes, separate the solid from the liquid, wash with deionized water until neutral, put the filtrate in a vacuum drying oven, and dry it at 85°C for 12 hours to obtain a solid dry matter.

[0021] (4) Place the above-me...

Embodiment 2

[0023] (1) 0.02molCoCl 2 ·6H 2 O was dissolved in 80mL of deionized water to form a cobalt salt solution, and 8 mg of ascorbic acid was added to the cobalt salt solution; 0.05 mL of 25% concentrated ammonia water was dissolved in 9.95 mL of deionized water to form a 10 mL ammonia solution, and then added 0.04molNaOH to obtain NaOH-ammonia mixed alkali solution.

[0024] (2) At room temperature, the NaOH-ammonia mixed alkali solution was evenly poured into the cobalt salt aqueous solution stirred at a constant speed at a flow rate of 500mL / min. After the mixed alkali solution was added completely, it was heated by microwave at 45°C and stirred for 60 minutes.

[0025] (3) After the microwave reaction is completed, age the above co-precipitate for 5 minutes, separate the solid from the liquid, wash with deionized water until neutral, put the filtrate in a vacuum drying oven, and dry at 85°C for 6 hours to obtain a solid dry matter.

[0026] (4) Place the above-mentioned dried...

Embodiment 3

[0028] (1) 0.06molCoSO 4 ·7H 2 O was dissolved in 60mL of deionized water to make a cobalt salt solution, and 60mg of ascorbic acid was added to the cobalt salt solution; 4mL of 25% concentrated ammonia water was dissolved in 36mL of deionized water to form a 40mL ammonia solution, and then 0.12molNaOH was added to the ammonia solution , to obtain NaOH-ammonia mixed alkali solution.

[0029] (2) At room temperature, the NaOH-ammonia mixed alkali solution was evenly poured into the cobalt salt aqueous solution stirred at a constant speed at a flow rate of 2000mL / min. After the mixed alkali solution was completely added, microwave heating at 85°C and stirring for 20 minutes.

[0030] (3) After the microwave reaction is completed, age the above co-precipitate for 10 minutes, separate the solid from the liquid, wash with deionized water until neutral, put the filtrate in a vacuum drying oven, and dry at 100°C for 2 hours to obtain a solid dry matter.

[0031] (4) Place the abov...

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Abstract

The invention belongs to the technical field of new material preparation, and relates to a method for preparing flaky nano CoO or Co3O4 through assistant microwave heating. The method is characterized by comprising the following steps that 1, soluble cobalt salt is dissolved in deionized water to prepare a cobalt salt solution with the concentration of 0.2-1 mol / L, and 0.01%-0.1% ascorbic acid is added in the cobalt salt solution; 2, sodium hydroxide and stronger ammonia water are prepared into a mixed alkali solution in proportion, wherein the concentration of the sodium hydroxide in the mixed alkali solution is 2-4 mol / L, and the volume of the stronger ammonia water accounts for 0.5%-10% of the total volume of the mixed alkali solution; 3, the mixed alkali solution is added in the cobalt salt solution, stirring reacting is performed for a period of time under microwave heating, filtering, washing and drying are performed, and then solid dried substances are obtained; 4, the solid dried substances are placed in a chamber electric furnace or microwave sintering furnace for a solid-phase reaction in an inert atmosphere or air atmosphere, and then the flaky nano CoO or Co3O4 is obtained. According to the method, precursors are synthesized through microwave assistant heating, the precursors do not need to be processed through ball milling after being dried, and after calcining is performed, the uniform flaky nano CoO or Co3O4 can be obtained.

Description

technical field [0001] The invention belongs to the field of new material technology preparation, and relates to a method for preparing nanosheet CoO, Co 3 o 4 Methods. Background technique [0002] In recent years, the study of low-dimensional nanostructured materials has attracted considerable attention from scientific researchers. This is because nanomaterials with special structure and morphology may have novel optical, electrical, magnetic and catalytic properties. Among transition metal oxides, cobalt-based oxides such as CoO, Co 3 o 4 , is an important magnetic P-type semiconductor, which has a very wide range of applications in many fields such as gas sensors, catalysts, magnetic materials, and rechargeable lithium-ion batteries. [0003] CoO, Co 3 o 4 The shape of the material, such as nano-cubic, spherical, nano-fiber, and polygonal nano-nails, etc., but the synthesis method is complicated and the post-processing is cumbersome. CoO, Co with different struct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04B82Y30/00B82Y40/00
Inventor 姚文俐戴啟年李平
Owner 江西省钨与稀土产品质量监督检验中心(江西省钨与稀土研究院)
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