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Mono-dispersed spherical mesoporous silicon dioxide nanomaterial and preparation method thereof

A technology of mesoporous silica and nanomaterials, applied in the field of inorganic porous materials, can solve the problems of poor mesoporous pore structure order, unsatisfactory particle size uniformity, etc., achieves good monodispersity, short preparation period, Particle size controllable effect

Inactive Publication Date: 2011-11-23
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses Tween as a dispersant, which reduces the agglomeration between particles, but the uniformity of particle size is still not ideal, and the order of its mesoporous pore structure is poor.

Method used

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  • Mono-dispersed spherical mesoporous silicon dioxide nanomaterial and preparation method thereof
  • Mono-dispersed spherical mesoporous silicon dioxide nanomaterial and preparation method thereof
  • Mono-dispersed spherical mesoporous silicon dioxide nanomaterial and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0023] Dissolve 0.20 g of cetyltrimethylammonium bromide in 86.4 ml of deionized water, add 9.6 ml of ethanol and 0.7 ml of 2 mol / L sodium hydroxide to the deionized water, and stir vigorously at 80 ° C for 0.5 hours to The solution was clear and transparent, and then 1.15ml tetraethyl orthosilicate was added rapidly under stirring, and the vigorous stirring was continued at 80°C for 2 hours. The reaction mixture was successively filtered, washed with ethanol three times, dried under vacuum at 60°C for 12 hours, and calcined at 550°C in air for 5 hours to obtain monodisperse spherical mesoporous silica nanomaterials.

[0024] from figure 1 and figure 2 It can be seen that the morphology of the synthesized silica is spherical and has good monodispersity. The average particle diameter is 160nm, and the relative standard deviation of particle diameter is 4.87%. from figure 2 It can be seen that the material has a pore structure arranged radially from the center of the spher...

Embodiment 2

[0026] Dissolve 0.20g of cetyltrimethylammonium bromide in 96ml of deionized water, add 0.7ml of 2mol / L sodium hydroxide, stir vigorously at 80°C for 0.5 hours until the solution is clear and transparent, then quickly add 1.15ml of tetraethyl orthosilicate, and continue to stir vigorously at 80°C for 2 hours. The reaction mixture was filtered, washed three times with ethanol, dried at 60°C for 12 hours in a vacuum environment, and calcined at 550°C for 5 hours in an air environment to obtain monodisperse spherical mesoporous silica nanomaterials.

[0027] The average particle size of the obtained monodisperse spherical mesoporous silica nanomaterial is 80nm, the relative standard deviation of particle size is 6.37%, the interplanar distance is 3.77nm, the mesoporous aperture is 2.55nm, and the specific surface area is 1057m 2 / g, the pore volume is 0.74cm 3 / g.

Embodiment 3

[0029] Dissolve 0.20 g of cetyltrimethylammonium bromide in 86.4 ml of deionized water, add 9.6 ml of ethanol and 0.7 ml of 2 mol / L sodium hydroxide to the deionized water, and stir vigorously at 80 ° C for 0.5 hours to The solution was clear and transparent, and then 0.75ml tetraethylorthosilicate was added rapidly under stirring, and the vigorous stirring was continued at 80°C for 2 hours. The reaction mixture was filtered, washed three times with ethanol, dried at 60°C for 12 hours in a vacuum environment, and calcined at 550°C for 5 hours in an air environment to obtain monodisperse spherical mesoporous silica nanomaterials.

[0030] The average particle size of the obtained monodisperse spherical mesoporous silica nanomaterial is 150nm, the relative standard deviation of the particle size is 7.40%, the interplanar spacing is 3.62nm, the mesoporous aperture is 2.51nm, and the specific surface area is 1367m 2 / g, the pore volume is 0.83cm 3 / g.

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Abstract

The invention relates to a mono-dispersed spherical mesoporous silicon dioxide nanomaterial, which is characterized in that: the nanomaterial has a spherical structure of which the particle diameter is 80-200 nanometers; the relative standard deviation of the particle diameter is not more than 8 percent; the specific surface area of the material is 1,057-1,379 m<2> / g; the pore volume is 0.74-0.89 cm<3> / g; the mesoporous pore diameter is 2.4-2.6 nanometers; and the nanometer material has a pore canal structure formed radially from the center of a sphere to an outer surface. The mono-dispersed spherical mesoporous silicon dioxide nanomaterial is prepared by hydrolyzing and condensing by taking a cationic surfactant as a template, tetraethyl orthosilicate as a silicon source and alcohol as a cosolvent under alkaline condition. The method has the advantages of simple equipment, easiness of operation, short preparation period, high repeatability, high yield, low cost and environment friendliness. The prepared silicon dioxide material is of spherical nanoparticles which have controllable particle diameters, uniform particle diameter distribution, high mono-dispersity, narrow pore diameter distribution and ordered mesoporous pore canal structures.

Description

technical field [0001] The invention belongs to the technical field of inorganic porous materials, and in particular relates to a monodisperse spherical mesoporous silica nanometer material and a preparation method thereof. Background technique [0002] Due to their large specific surface area and adsorption capacity, inorganic porous materials have a wide range of applications in the fields of adsorption, separation, and catalysis. According to the definition of the International Union of Pure and Applied Chemistry (IUPAC), according to the pore size, porous materials can be divided into the following three types: microporous materials, whose pore diameter is <2nm; macroporous materials, whose pore diameter is >50nm; mesoporous materials, whose pore diameter The size is between micropore and macropore (IUPAC Manual of Symbols and Terminology. Pure Appl. Chem [J], 1972, 31: 578-680). The performance of a material is closely related to the particle size and shape of th...

Claims

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Application Information

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IPC IPC(8): C01B33/12B82Y40/00
Inventor 朱桂茹包孟如高从堦
Owner OCEAN UNIV OF CHINA
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