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Alpha-Fe2O3 nanometer sphere preparation method

A technology of nanospheres, fecl3 6h2o, applied in the field of chemical engineering, to achieve good adsorption, energy saving, and short reaction time

Active Publication Date: 2013-05-01
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most preparation methods involve high temperature and long-term chemical reactions, and toxic organic solvents or directing agents are often used as templates in the reaction process, which limits the preparation of three-dimensional nanostructured α-Fe. 2 o 3 Practical application in water treatment

Method used

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  • Alpha-Fe2O3 nanometer sphere preparation method

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Experimental program
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Effect test

Embodiment 1

[0039] 1) Ferric chloride hexahydrate (FeCl 3 ·6H 2 O) is the iron source, urea (CO(NH 2 ) 2 ) Is a hydroxide ion initiator with a molar ratio of 1:1. The iron source and initiator are dissolved in a mixed solvent composed of glycerin and water using ultrasound. The concentration of iron source is 1.0 mol / L, and the volume ratio of glycerin and water is 1:9. The mixed solution was placed in a polytetrafluoroethylene reactor and sealed, transferred to a microwave reactor, and subjected to microwave treatment at a temperature of 150° C. for 30 min.

[0040] 2) The product after the above microwave treatment is naturally cooled and centrifuged at 10,000 rpm for 30 minutes. The resulting precipitate is washed alternately with ethanol and water, washed and dried at 80°C for 5 hours to obtain solid nanospheres with an average diameter of 300-350 nm. The overall structure It is composed of rod-shaped nano subunits with a size of 20-50nm, such as image 3 Shown.

[0041] by image 3 The s...

Embodiment 2

[0043] 1) Ferric chloride hexahydrate (FeCl 3 ·6H 2 O) is the iron source, urea (CO(NH 2 ) 2 ) Is a hydroxide ion initiator with a molar ratio of 1:1. The iron source and initiator are dissolved in a mixed solvent composed of glycerin and water using ultrasound. The concentration of iron source is 1.0 mol / L, and the volume ratio of glycerol and water is 1:6. The mixed solution was placed in a polytetrafluoroethylene reactor and sealed, transferred to a microwave reactor, and subjected to microwave treatment at 140° C. for 30 min.

[0044] 2) The product after the above microwave treatment is naturally cooled and centrifuged at 10,000 rpm for 30 minutes. The resulting precipitate is washed alternately with ethanol and water, washed and dried at 80°C for 5 hours to obtain semi-solid nanospheres with an average diameter of 350-400 nm. The structure is composed of rod-shaped nano subunits with a size of 20-50nm, such as Figure 4 Shown.

[0045] by Figure 4 It is clearly visible that...

Embodiment 3

[0047] 1) Ferric chloride hexahydrate (FeCl 3 ·6H 2 O) is the iron source, urea (CO(NH 2 ) 2 ) Is a hydroxide ion initiator with a molar ratio of 1:1.5. The iron source and the initiator are dissolved in a mixed solvent composed of glycerin and water using ultrasound. The concentration of iron source is 1.0 mol / L, and the volume ratio of glycerin and water is 1:3. The mixed solution was placed in a polytetrafluoroethylene reactor and sealed, transferred to a microwave reactor, and subjected to microwave treatment at 140° C. for 30 min.

[0048] 2) After the above microwave treatment, the product is naturally cooled and centrifuged at 10,000 rpm for 30 minutes. The resulting precipitate is washed alternately with ethanol and water, washed and dried at 80°C for 5 hours to obtain hollow nanospheres with an average diameter of 300-400 nm, hollow spherical shells The thickness is about 60nm. Its overall structure is composed of rod-shaped nano subunits with a size of 30-50nm, such as...

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Abstract

The present invention belongs to the technical field of chemical engineering, and specifically relates to an alpha-Fe2O3 nanometer sphere preparation method. The method specifically comprises: adopting ferric chloride hexahydrate (FeCl3.6H2O) as an iron source, adopting urea (CO(NH2)2) as a hydroxide radical ion initiator, dissolving the iron source and the initiator in a mixing solvent comprising glycerin and water by using ultrasound, placing the mixed solution in a sealed condition to carry out a microwave treatment for 20-50 min at a temperature of 120-160 DEG C, naturally cooling the product from the microwave treatment, then carrying out centrifugation, carrying out alternate washing on the resulting precipitate by using ethanol and water, and drying to obtain the alpha-Fe2O3 nanometer sphere having an average diameter of 300-500 nm, wherein the whole structure of the nanometer sphere comprises rod-shaped nanometer sub-units with a size of about 20-50 nm. According to the present invention, cheap and non-toxic glycerin / water is adopted as a solvent so as to avoid use of toxic and organic reagents, and the microwave method provides characteristics of short reaction time, energy resource saving and environmental protection compared with the traditional heating method.

Description

Technical field [0001] The invention belongs to chemical engineering technology, and specifically relates to a preparation of α-Fe 2 O 3 Nanosphere method. Background technique [0002] Sewage treatment technology has attracted much attention. With the development of nanotechnology, the research of transition metal hydroxide and oxide nanomaterials for environmental monitoring and pollutant control has been reported frequently. The unique properties of nanomaterials stem from their rich valence state, large surface area and variable electronic structure. In recent years, three-dimensional nanostructured materials composed of layered nanosubunits have shown good adsorption properties in removing heavy metal ions and organic pollutants in water due to their special structure, and have a wide range of application prospects. Therefore, the research on the synthesis of various good-performance three-dimensional nanostructure materials by controlling the morphology is in the ascendan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06B82Y30/00
Inventor 李鹏程魏振华邢荣娥刘松于华华秦玉坤李荣峰李克成李冰王雪芹
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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