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Preparation method for mesoporous hollow alumina particle

A hollow alumina and particle technology is applied in the preparation field of the alumina technology field, which can solve the problems of inability to obtain hollow mesoporous alumina particles, achieve an economical synthesis route and avoid the effect of the synthesis process.

Active Publication Date: 2010-06-23
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method utilizes the coagulation principle of the electrolyte on the alumina sol, and the spherical alumina particles are prepared by the coagulation of the alumina sol, but the method cannot obtain hollow mesoporous alumina particles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Using aluminum nitrate nonahydrate as a raw material, prepare 100 milliliters of 21.2wt.% aluminum nitrate aqueous solution with a concentration of 21.2wt.%, and gradually add dropwise a concentration of 25-28wt.% ammonia solution under continuous stirring. When reaching 28 grams, the pH value of the system is greater than 9.2. After being stirred and washed by centrifugal filtration several times, a boehmite precipitated filter cake is obtained, and water is added to the filter cake to dilute it into a 20 wt.% boehmite suspension. Take 8 grams of the boehmite suspension, then add 8 grams of 2 mol / l nitric acid solution, mix well and then reflux and stir at 80° C. for 1 hour to obtain a clear and transparent boehmite sol. The NaCMC125 (sodium carboxymethylcellulose 125) solution of 5.0wt.% is added in the obtained boehmite sol with dropper, obtains white transparent hollow sphere, after standing aging 48 hours, these hollow boehmite The stone balls are collected, dried ...

Embodiment 2

[0019] Using aluminum nitrate nonahydrate as a raw material, prepare 100 milliliters of 21.2wt.% aluminum nitrate aqueous solution with a concentration of 21.2wt.%, and gradually add dropwise a concentration of 25-28wt.% ammonia solution under continuous stirring. When reaching 28 grams, the pH value of the system is greater than 9.2. After being stirred and washed by centrifugal filtration several times, a boehmite precipitated filter cake is obtained, and water is added to the filter cake to dilute it into a 5 wt.% boehmite suspension. Take 8 grams of the boehmite suspension, then add 8 grams of 2 mol / l nitric acid solution, mix well and then reflux and stir at 80° C. for 1 hour to obtain a clear and transparent boehmite sol. The NaCMC1000 (sodium carboxymethyl cellulose 1000) solution of 1.0wt.% is added in the obtained boehmite sol with syringe, obtains white transparent hollow sphere, puts these hollow boehmite after static aging 24 hours The balls were collected, dried a...

Embodiment 3

[0021] Using aluminum nitrate nonahydrate as a raw material, prepare 100 milliliters of 21.2wt.% aluminum nitrate aqueous solution with a concentration of 21.2wt.%, and gradually add dropwise a concentration of 25-28wt.% ammonia solution under continuous stirring. When reaching 28 grams, the pH value of the system is greater than 9.2. After being stirred and washed by centrifugal filtration several times, a boehmite precipitated filter cake is obtained, and water is added to the filter cake to dilute it into a 10 wt.% boehmite suspension. Take 8 grams of the boehmite suspension, then add 8 grams of 2 mol / l nitric acid solution, mix well and then reflux and stir at 80° C. for 1 hour to obtain a clear and transparent boehmite sol. The NaCMC1700 (sodium carboxymethylcellulose 1000) solution of 0.5wt.% is added in the obtained boehmite sol with sprayer, obtains white transparent hollow sphere, puts these hollow boehmite after standing aging 1 hour The balls were collected, dried a...

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Abstract

The invention provides a preparation method for a mesoporous hollow alumina particle in the technical field of a porous carrier. The mesoporous hollow alumina particle is sphere-like, the average particle diameter is from 0.1 to 5mm, the wall of the particle is made of mesoporous Gamma-alumina, the thickness of the particle is from 20 to 200mum, the pore volume of the wall of the particle is from 0.27 to 0.50cm3 / g, and the average aperture is from 3.24 to 5.09nm. The preparation method is characterized in that: a white transparent thin diaspore hollow sphere is obtained after polyose electrolyte solution is added to thin diaspore collosol, and the mesoporous hollow alumina particle is obtained after the ageing and calcining are carried out. With simple steps, the preparation method in the invention provides a simple, convenient and economical synthesizing way for the synthesis of the organic hollow sphere.

Description

technical field [0001] The invention relates to a preparation method in the technical field of alumina, in particular to a preparation method of mesoporous hollow alumina particles. Background technique [0002] Hollow materials have bright application potential in many occasions, for example, as a carrier for the delivery of drugs and biomacromolecules and for the controlled release of drugs against corresponding targets; protection of certain sensitive substances, such as enzymes and proteins; and specific reactors for biomolecules; encapsulation of cells for immobilization, etc. Hollow spheres with adjustable size and wall thickness can be synthesized by a series of chemical or physicochemical means. Although polymer-based hollow spheres have been widely used in the fields of medicine, electronics, and the environment, their poor chemical and thermal stability limits their further applications. Therefore, more researchers have begun to pay attention to inorganic hollow s...

Claims

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Application Information

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IPC IPC(8): C01F7/02B01J13/02
Inventor 赵斌元石悠邓国民赖亦坚唐建国胡晓斌
Owner SHANGHAI JIAO TONG UNIV
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