Synthetic method for porous silicon dioxide hollow micro ball
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A technology of porous silica and synthesis method, applied in the direction of silica, silica, etc., can solve the problems of poor product stability, cumbersome operation, easy collapse of empty walls, etc., achieve mild reaction conditions and improve production efficiency , product quality and the effect of yield guarantee
Inactive Publication Date: 2007-04-11
FUDAN UNIV
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The disadvantage of this method is that the operation is cumbersome, the stability of the product i
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Embodiment 1
[0021] In TEOS(mol):C 2 h 5 OH (mol): H 2 O (mol): Span-80 (g): kerosene (g) = 1: 3: 20: 15: 40, change and add HNO 3 moles of n(HNO 3 ) / n(TEOS) is 0.5, the product is a hollow sphere, as shown in Figure 1.
Embodiment 2
[0023] In TEOS(mol):H 2 O (mol): HNO 3 (mol): Span-80 (g): kerosene (g) = 1: 20: 0.5: 15: 40 conditions, the amount of TEOS is 6ml, change C 2 h 5 The amount of OH added, in n(C 2 h 5 When OH) / n(TEOS) is 2, the product is a hollow sphere, and the SEM photo of the product is shown in Figure 2.
Embodiment 3
[0025] In TEOS(mol): C 2 h 5 OH (mol): H 2 O (mol): HNO 3 (mol): kerosene (g)=1:3:20:0.5:40, the amount of TEOS was 6ml, and the amount of Span-80 was changed. When the Span-80 was 20g / mol TEOS, the product was a hollow sphere.
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Abstract
The present invention relates to synthesis process of hollow porous silicon dioxide micro ball. By means of combining O/W/O emulsion and sol-gel technology, using TEOS as silicon source and HNO3 as TEOS hydrolyzing catalyst, and through catalytic hydrolysis reaction at relatively high temperature, the present invention synthesizes hollow porous silicon dioxide micro ball with kerosene as oil phase and Span-80 as emulsifier. The present invention has simple process and cheap material, and the obtained hollow porous silicon dioxide micro ball has wide application foreground in catalysis, selective separation, dielectric material and other field.
Description
technical field [0001] The invention belongs to the technical field of inorganic porous hollow microspheres, and relates to a new synthesis method of porous silica hollow microspheres. Background technique [0002] Porous silica has high thermal stability, hydrothermal stability, large specific surface area, and good compatibility with other materials, so it has attracted widespread attention. At present, porous silica has been used in selective separation, catalysis, dielectric materials, prosthetic base materials, etc. In addition, people are still exploring its application in gas adsorption, inorganic material carrier, and enzyme immobilization. [0003] So far, there are three main methods for preparing hollow microspheres: spray method (CN Patent: 1 689 557, 2005), emulsion method combined with sol-gel method (CN Patent: 1 223 240A, 1999; US Patent: 5 376 347 , 1994; 5 733 567, 1998; 4 479 911, 1984), sacrificial nuclear method (CN Patent: 1 480 401, 2004; 1 506 308, ...
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