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Preparation method of mesoporous silica hollow spheres with adjustable shell thickness

A technology of mesoporous silica and hollow spheres, which is applied in the fields of silica, silica, nanotechnology, etc., can solve the problems of inability to prepare mesoporous silica hollow spheres, and achieves low cost of raw materials, single shape, The effect of controllable reaction conditions

Inactive Publication Date: 2018-03-23
BEIJING EURO & AMERICAN INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above synthetic methods cannot prepare mesoporous silica hollow spheres with adjustable shell thickness.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 100 mg of CTAB was dissolved in a mixed solution of 100 mL of 60% ethanol solution by volume and 1 mL of ammonia water (25 wt%), and stirred at 35° C. for 2 h until the solution became a clear solution. Then, 1mLTEOS was added dropwise at a rotation speed of 500rpm, and then stirred at 35°C for 24h, the solution gradually changed from clear to white mixed solution, and a white precipitate was formed. Subsequently, the precipitate in the mixed solution was separated by centrifugation, washed with ethanol several times and then dried into white powder. The obtained white powder was dispersed in water at 70° C. for 2 h, washed with ethanol four times by centrifugation, and then dried to a white powder. Subsequently, the obtained solid was dispersed in a 40% ethanol solution containing HCl (37%) and stirred at 60° C. for 3 h, and then repeated extraction was performed twice, and the mesoporous silica hollow spheres obtained by removing the surfactant were washed with ethano...

Embodiment 2

[0049]100 mg of CTAB was dissolved in a mixed solution of 100 mL of 70% ethanol solution by volume and 1 mL of ammonia water (25 wt%), and stirred at 35° C. for 2 h until the solution became a clear solution. Then, 1mLTEOS was added dropwise at a rotation speed of 500rpm, and then stirred at 35°C for 24h, the solution gradually changed from clear to white mixed solution, and a white precipitate was formed. Subsequently, the precipitate in the mixed solution was separated by centrifugation, washed with ethanol several times and then dried into white powder. The obtained white powder was dispersed in water at 70° C. for 6 h, washed by ethanol for 4 times by centrifugation, and then dried into a white powder. Subsequently, the obtained solid was dispersed in a 40% ethanol solution containing HCl (37%) and stirred at 60° C. for 3 h, and then repeated extraction was performed twice, and the mesoporous silica hollow spheres obtained by removing the surfactant were washed with ethano...

Embodiment 3

[0052] 100 mg of CTAB was dissolved in a mixed solution of 100 mL of 70% ethanol solution by volume and 1 mL of ammonia water (25 wt%), and stirred at 35° C. for 2 h until the solution became a clear solution. Then, 1mLTEOS was added dropwise at a rotation speed of 500rpm, and then stirred at 35°C for 24h, the solution gradually changed from clear to white mixed solution, and a white precipitate was formed. Subsequently, the precipitate in the mixed solution was separated by centrifugation, washed with ethanol several times and then dried into white powder. The obtained white powder was dispersed in water at 70° C. for 48 hours, washed by ethanol for 4 times by centrifugation, and then dried into a white powder. Subsequently, the obtained solid was dispersed in a 40% ethanol solution containing HCl (37%) and stirred at 60° C. for 3 h, and then repeated extraction was performed twice, and the mesoporous silica hollow spheres obtained by removing the surfactant were washed with ...

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Abstract

The invention relates to a preparation method of mesoporous silica hollow spheres with adjustable shell thickness. The preparation method comprises the following steps: (1) dissolving hexadecyl trimethyl ammonium bromide in a mixed solution of ammonia water, ethanol and deionized water, and carrying out stirring under heating; (2) adding tetraethylorthosilicate into the solution obtained in the step (1) under heating and stirring, and carrying out heating and stirring continuously; (3) carrying out solid-liquid separation on the mixture after the reaction in the step (2), washing the solid with ethanol, and drying the solid to obtain white powder; (4) dispersing the white powder obtained in the step (3) in deionized water, and carrying out drying after solid-liquid separation and ethanol washing to obtain white powder; and (5) dispersing the white powder obtained in the step (4) in an ethanol solution containing HCl, carrying out drying after solid-liquid separation and ethanol washing, and grinding the solid into powder to obtain the mesoporous silica hollow spheres. The preparation method provided by the invention is simple in process, and the shell thickness of the prepared product can be effectively adjusted.

Description

technical field [0001] The invention relates to a method for preparing mesoporous silica hollow spheres with adjustable shell thickness, and belongs to the technical field of nanomaterial synthesis. Background technique [0002] Mesoporous silica hollow spheres have the characteristics of mesoporous materials, such as high specific surface area, large pore volume, uniform pore size distribution, good stability, etc., and their hollow structure endows them with the ability to accommodate guest molecules, which can promote The mass transfer diffusion adsorption of molecules is an ideal carrier for the preparation of catalysts. However, most of the currently prepared mesoporous hollow materials have disadvantages such as poor structural stability, uneven morphology and particle size, and it is difficult to effectively control their hollow structure and mesoporous wall thickness. The above structural parameters and texture properties have a very important impact on its dispersi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18B82Y40/00
CPCC01B33/18B82Y40/00C01P2004/34C01P2004/64C01P2006/12C01P2006/14C01P2006/16
Inventor 张成如
Owner BEIJING EURO & AMERICAN INST OF SCI & TECH
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