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Method for synthesizing high-dispersibility high-specific surface area large-pore volume SiO2 hollow spheres

A technology with a high specific surface area and a synthetic method, applied in the field of microporous/mesoporous molecular sieve materials, can solve the problems of serious agglomeration, easy environmental pollution, and cumbersome steps

Active Publication Date: 2011-05-18
中国科学院上海硅酸盐研究所苏州研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing mesoporous SiO with highly dispersed, controllable particle size, high specific surface area, large pore volume, and uniform pore size distribution. 2 Hollow sphere method to solve the existing problems in the prior art such as cumbersome steps, harsh conditions, serious agglomeration phenomenon, easy to produce environmental pollution, etc.

Method used

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  • Method for synthesizing high-dispersibility high-specific surface area large-pore volume SiO2 hollow spheres
  • Method for synthesizing high-dispersibility high-specific surface area large-pore volume SiO2 hollow spheres
  • Method for synthesizing high-dispersibility high-specific surface area large-pore volume SiO2 hollow spheres

Examples

Experimental program
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Embodiment 1

[0017] Mix 71.4mL of absolute ethanol, 10mL of deionized water and 3.14mL of ammonia water, stir at 30°C for 30min; quickly add 6mL of ethyl orthosilicate, and magnetically stir for 1h; After the alkyltrimethoxysilane is uniformly mixed, the above solution is quickly added, and magnetically stirred for 1 h, and the product is centrifuged to obtain highly dispersed solid core / mesoporous shell SiO 2 nanospheres. The centrifuged product was dispersed in 0.12mol / L ammonia solution and heated at 150°C for 24h. After centrifugation, the product was washed three times with deionized water, dried at 100°C for 6h, and then calcined at 550°C for 6h to remove the surfactant.

Embodiment 2

[0027]According to the synthesis process of Example 1, the solid core / mesoporous shell SiO is first obtained 2 nanospheres. After centrifugation, the product was dispersed in 0.12mol / L ammonia solution and heated at 180°C for 24h. Subsequent processing was as in Example 1.

Embodiment 3

[0031] According to the synthesis process of Example 1, the solid core / mesoporous shell SiO is first obtained 2 nanospheres. After centrifugation, the product was dispersed in 0.05mol / L ammonia solution and heated at 150°C for 72h. Subsequent processing was as in Example 1.

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Abstract

The invention relates to a method for synthesizing high-dispersibility high-specific surface area large-pore volume SiO2 hollow spheres. The method comprises the following steps of: synthesizing high-dispensability uniform-pore size solid core / mesoporous shell SiO2 nanospheres through a sol-gel method and a surfactant directing method; and removing solid cores of the SiO2 nanospheres and keeping a complete mesoporous shell layer through a simple hydrothermal post-treatment method in alkaline solution so as to obtain the mesoporous SiO2 hollow spheres. The prepared mesoporous SiO2 hollow spheres have high dispersibility, high specific surface area, large pore volume, uniform pore size distribution and adjustable cavities. The results prove that: the mesoporous SiO2 hollow spheres subjectedto alkaline post-treatment have the specific surface area of 320m<2> / g and the pore volume of 0.66cm<3> / g, and has wide application prospect in the fields of medicament delivery, catalysis, microreactors, adsorption, separation, chromatogram and the like.

Description

technical field [0001] The invention belongs to the technical field of microporous / mesoporous molecular sieve materials, and relates to a highly dispersed, high specific surface area, large pore volume SiO 2 Synthesis of hollow spheres. Background technique [0002] Since 1992 MCM-41 mesoporous SiO 2 Since molecular sieves were synthesized by Mobil scientists (Nature 1992, 359, (6397), 710-712.), mesoporous SiO 2 Due to its high specific surface area, large pore volume, and uniform pore structure, the material shows broad application prospects in the fields of chemical catalysis, medicine, and nanobiotechnology. In 2001, researchers discovered MCM-41 mesoporous SiO 2 It has efficient drug storage and sustained release properties (Chem. Mat. 2001, 13, (2), 308-311). Follow-up studies further found that mesoporous SiO 2 Has good biocompatibility. Therefore, mesoporous SiO 2 It is a good drug carrier, and exerts unique advantages in the early diagnosis and treatment of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 陈雨陈航榕施剑林何前军陈风
Owner 中国科学院上海硅酸盐研究所苏州研究院
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