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Method for preparing mesoporous silicon oxide microballoons

A technology of mesoporous silica and microspheres, applied in the direction of silica, silica, etc., can solve the problems that are not suitable for sewage adsorption and filtration, small size of microspheres, large pore size distribution, etc., and achieve good environmental protection and economic benefits , short reaction time, strong adsorption effect

Active Publication Date: 2013-08-21
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above methods can prepare mesoporous silica microspheres, but the microspheres prepared by them generally have defects such as small size, large pore size distribution, and poor adsorption capacity, which are not suitable for sewage adsorption and filtration.

Method used

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  • Method for preparing mesoporous silicon oxide microballoons
  • Method for preparing mesoporous silicon oxide microballoons
  • Method for preparing mesoporous silicon oxide microballoons

Examples

Experimental program
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Embodiment 1

[0030] It is prepared with the following raw materials, each raw material and its molar ratio are: polyoxyethylene-polyoxypropylene-polyoxyethylene (P123), tetraethyl orthosilicate (TEOS), cetyltrimethylammonium bromide (CTAB ), n-butanol, deionized water and 37.5% concentrated hydrochloric acid in a mol ratio of 0.0069: 0.54: 0.027: 2.7: 50: 4.9.

[0031] Microsphere preparation process:

[0032] (1) Add 4g of polyoxyethylene-polyoxypropylene-polyoxyethylene (P123) to 25ml of n-butanol, stir for 10 minutes to make the solution uniform, and then add 1g of hexadecyltrimethyl bromide to the above solution ammonium chloride (CTAB), continue to stir for 5 minutes, then add 50ml deionized water to the solution, continue to stir for 5 minutes to make the solution fully mixed, then add 15ml37.5% concentrated hydrochloric acid to the solution, stir for 2 hours to make the solution fully Mix, and finally add 12ml tetraethyl orthosilicate (TEOS) to the solution, and stir vigorously at ...

Embodiment 2

[0042] It is prepared with the following raw materials, each raw material and its molar ratio are: polyoxyethylene-polyoxypropylene-polyoxyethylene (P123), tetraethyl orthosilicate (TEOS), cetyltrimethylammonium bromide (CTAB ), n-butanol, deionized water and 37.5% concentrated hydrochloric acid in a mol ratio of 0.0072: 0.6: 0.03: 2.8: 70: 5.0.

[0043] Microsphere preparation process:

[0044] (1) Add 4.2g of polyoxyethylene-polyoxypropylene-polyoxyethylene (P123) to 25.6ml of n-butanol, stir for 10 minutes to make the solution uniform, and then add 1.1g of hexadecyltri Methylammonium bromide (CTAB), continue to stir for 5 minutes, then add 70ml deionized water to the solution, continue to stir for 5 minutes to make the solution fully mixed, then add 15.5ml37.5% concentrated hydrochloric acid in the solution, stir vigorously for 2 hour, finally add 13.3ml tetraethyl orthosilicate (TEOS) to the solution, stop stirring and leave to stand for 36h to obtain the precursor soluti...

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Abstract

The invention discloses a method for preparing mesoporous silicon oxide microballoons and belongs to the technical field of mesoporous silicon oxide material preparation. The method comprises that a cation surface active template, a nonionic block-type surfactant and ethyl orthosilicate are added into an n-butyl alcohol-water system; the ethyl orthosilicate is hydrolyzed into template-containing mesoporous silicon oxide small balls under acidic conditions; and the template-containing mesoporous silicon oxide small balls are calcined in the N2 atmosphere to form the mesoporous silicon oxide microballoons. The mesoporous silicon oxide microballoon has a narrow aperture distribution range, a homogeneous mesoporous skeleton and good heat stability within 800 DEG C. The method is simple, is easy for operation, has a low cost and short reaction time, and does not introduce any impurity. The mesoporous silicon oxide microballoon obtained by the preparation method has a very large specific surface area, mesoporous sizes of 3 to 5 nanometers, an appropriate particle size of 40 to 80 micrometers, strong adsorption capability and good filterability and barrier properties, and can be utilizedas an adsorption material and a filtration material of pollutants in water.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of mesoporous materials, in particular to a method for preparing mesoporous silicon oxide microspheres. Background technique [0002] In order to solve the increasingly serious environmental pollution problems, such as POPs (Persistent Organic Pollutants), harmful gases, heavy metal ions, etc., these pollutants need to be filtered or adsorbed, and mesoporous materials have been recognized as a very effective Prospect materials, because mesoporous materials have nano-scale pore size, high specific surface area and single ordered mesoscopic structure, making it a potential porous adsorbent, and mesoporous materials have rapid desorption, repeated The characteristics of utilization make it have good environmental protection and economic benefits. Corresponding research has been done on the idea of ​​making microspheres from mesoporous materials. [0003] Qiu Jianjian et al. used TEOS as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/12
Inventor 蔡强朱维耀刘健
Owner TSINGHUA UNIV