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A kind of preparation method of hydrotalcite hollow microsphere

A technology of hollow microspheres and hydrotalcites, which is applied in the preparation of microspheres and microcapsule preparations to achieve the effects of light weight, increased specific surface area, and large specific surface

Inactive Publication Date: 2011-12-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the design and synthesis of monodisperse 3D hydrotalcites has not been reported yet.

Method used

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  • A kind of preparation method of hydrotalcite hollow microsphere
  • A kind of preparation method of hydrotalcite hollow microsphere
  • A kind of preparation method of hydrotalcite hollow microsphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1). Preparation of alumina monohydrate-coated silica microspheres:

[0020] a. Dissolve 11.5g of aluminum isopropoxide into 100ml of deionized water, stir at 85°C for 20 minutes, adjust the pH value to 3 with 1mol / L nitric acid, continue stirring for 2 hours, and then put it at room temperature for 5 days to Completely dry; add 5.8g of dried alumina monohydrate powder to 107ml of deionized water, stir at 85°C for 1 hour, add 9.5ml of 1mol / L nitric acid and continue stirring for 6 hours, then cool to room temperature to obtain monohydrate Alumina sol;

[0021] b. Add 8.5ml of tetraethyl orthosilicate, 18ml of deionized water and 98ml of ammonia water with a mass concentration of 25% into a three-necked flask containing 76ml of absolute ethanol, stir at room temperature for 4 hours, and then centrifugally wash with absolute ethanol until Neutral, dry at 60°C for 12 hours to obtain evenly dispersed silica microspheres;

[0022] c. Put 2 g of the silica microspheres obtai...

Embodiment 2

[0027] 1). Preparation of alumina monohydrate-coated silica microspheres:

[0028] a. Dissolve 10.2g of aluminum isopropoxide into 80ml of deionized water, stir at 80°C for 30 minutes, adjust the pH value to 3.5 with 0.8mol / L nitric acid, continue stirring for 3 hours, and then leave it at room temperature for 6 days until completely dry; add 5.5g of dried alumina monohydrate powder to 100ml of deionized water, stir at 80°C for 2 hours, add 10ml of 0.8mol / L nitric acid and continue stirring for 7 hours, then cool to room temperature to obtain a Hydrated alumina sol;

[0029] b. Add 8.1ml of tetraethyl orthosilicate, 15ml of deionized water and 90ml of ammonia water with a mass concentration of 20% into a three-necked flask containing 70ml of absolute ethanol, stir at room temperature for 4 hours, and then centrifugally wash with absolute ethanol until Neutral, dry at 70°C for 8 hours to obtain evenly dispersed silica microspheres;

[0030] c. Take 3g of the silica microspher...

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Abstract

The invention discloses a preparation method of a nano vacant-shell spherical hydrotalcite and belongs to the field of inorganic nano materials. The preparation method comprises steps of: first, preparing a silica microballoon and an alumina monohydrate sol; dipping the prepared silica microballoons in the alumina monohydrate sol for several times to obtain an alumina monohydrate wrapped silica composite microballoon with a core-shell structure; putting the obtained composite microballoon in a solution containing divalent metal salt, and crystallizing at a certain temperature to obtain the vacant-shell spherical hydrotalcite. The invention first realizes the preparation of a three-dimensional vacant-shell hydrotalcite and expands preparation method of the hydrotalcite materials. The prepared vacant-shell hydrotalcite has a controllable nano size, and an increased specific surface area due to the three-dimensional vacant-shell structure and the cavity.

Description

technical field [0001] The invention belongs to the field of synthesis of inorganic nanometer materials, in particular to a method for preparing hollow-shell spherical hydrotalcite. Background technique [0002] Double metal composite hydroxide, also known as Layered Double Hydroxides (LDHs for short), is a typical anionic layered material, in which the hydroxides of divalent and trivalent metal ions are highly dispersed with each other and co- The valence bond constitutes the main laminate, which is rich in positive charges, the anions between the layers are arranged in an orderly manner and can be exchanged, and the ratio of metal elements in the laminate is adjustable. In recent years, due to the unique structural characteristics of hydrotalcite materials and the resulting diversity in design, synthesis and assembly, their powder materials and thin film materials based on hydrotalcite have played an important role in catalysis, adsorption and functional devices. has been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02
Inventor 卫敏邵明飞宁凡雨段雪
Owner BEIJING UNIV OF CHEM TECH
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