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Method for preparing sphere-like mesoporous silica

A mesoporous silica, quasi-spherical technology, applied in the direction of silica, silica, etc., to prevent large-area leakage, high yield, and uniform dispersion

Inactive Publication Date: 2014-05-07
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome complex processes such as the use of macromolecular block copolymers or large molecular weight single-chain ionic surfactants as templates, the need to add organic additives, and adjust pH to synthesize single straight channel mesoporous silica. The method of materials, providing a synthetic method for the synthesis of spherical mesoporous silica with worm-like channels using short-chain single / double-chain composite templates

Method used

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  • Method for preparing sphere-like mesoporous silica
  • Method for preparing sphere-like mesoporous silica
  • Method for preparing sphere-like mesoporous silica

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Place a 100mL beaker on a magnetic stirrer, add 35mL of distilled water and heat up to 30°C, add 0.142g of CTAB to the distilled water under stirring, stir to form a transparent solution, add 0.055g of DDAB, and stir until completely dissolved.

[0029] Then add 0.69mL of ammonia water with a volume ratio of 25%. After stirring for 2 hours, slowly add 2.0g of TEOS to the mixture under stirring conditions. After sealing, stir and react at a constant temperature for 24 hours to obtain a white precipitate.

[0030] The obtained white precipitate solution was transferred to a 50mL reaction kettle, and placed in a thermostat at 100°C for 24h. After cooling, the white precipitate solution was filtered, and the obtained precipitate was repeatedly filtered and washed with distilled water.

[0031] The washed precipitate was dried at 50° C. for 12 hours, ground and then calcined in a tubular calciner at 550° C. for 6 hours to obtain spherical mesoporous silica.

[0032] Observa...

Embodiment 2

[0034] Same as in Example 1, except that the amount of ammonia water added was changed to 0.96 mL, and other conditions remained unchanged, the morphology of the spherical mesoporous silica obtained was similar to that of Example 1.

Embodiment 3

[0036] As in Example 1, the amount of TEOS added was changed to 1.5 g, and other conditions remained unchanged, and the morphology of the spherical mesoporous silica obtained was similar to that of Example 1.

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Abstract

The invention discloses a method for preparing sphere-like mesoporous silica. The method comprises steps of successively adding quantitative CTAB (cetyltrimethyl ammonium bromide) and DDAB (dimethyl dioctadecyl ammonium bromide) into 30-35 DEG C distilled water and dissolving, adding a little ammonium hydroxide, 2 hours later, adding TEOS (tetraethyl orthosilicate), stirring constantly and reacting for 24 hours so as to obtain white precipitate, transferring the white precipitate into a reaction kettle, standing in an incubator, then suction filtering, washing, drying, grinding and calcining so as to obtain the sphere-like mesoporous silica with wormlike pore canals. By utilizing a single / double cationic surfactant composite template, the method can prepare the 90-100nm sphere-like mesoporous silica which has uniform size distribution, is uniformly distributed, and has stable structure, the pore canal is obvious and is 2-3nm, the method is widely used, has mild reaction conditions, has no toxicity and has high yield.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and in particular relates to a method for preparing spherical mesoporous silica. Background technique [0002] Using surfactants as templates to obtain mesoporous silica materials has always been one of the research hotspots in the preparation of mesoporous materials. Since the initial report of the M4IS series of mesoporous materials synthesized by Mobil researchers using quaternary ammonium salt cationic surfactants as templates, with the continuous research, it has been found that mesoporous silica materials can spontaneously dissolve in various surfactant solutions. Formation, such as mixed solutions of ionic, nonionic and their compound systems cationic / cation, cationic / anionic, ion / nonionic, ion / amphoteric surfactants, Bola and Gemini surfactants with special structure are also is widely used. Tan et al. used the fluorine-containing cationic surfactant 1H, 2H, 2H-perfluorodecyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 周国伟张彦李艳陈兴芬
Owner QILU UNIV OF TECH
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