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Method for preparing silver-carried silica microsphere functional materials

A technology of silicon dioxide and functional materials, which is applied in the preparation of silver-silica microsphere functional materials and the preparation of silver-loaded microsphere materials. High efficiency, simple operation and low energy consumption

Inactive Publication Date: 2012-11-07
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The carrier used in this type of method is mostly solid or mesoporous silica, and in the actual application process, the solid silica loaded metal silver composite material is due to the principle of simple physical adsorption, so that in the application process The peeling phenomenon of nano-metallic silver and carrier has occurred; and mesoporous silica-supported metallic silver has a small mesopore, which affects the contact between metallic silver and target substances.
All of these limit the further development of the function of nano-metallic silver.

Method used

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  • Method for preparing silver-carried silica microsphere functional materials
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  • Method for preparing silver-carried silica microsphere functional materials

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Add 18 mL of tetraethyl orthosilicate into a mixed solvent composed of 260 mL of absolute ethanol and 99 mL of deionized water, and stir magnetically. Add 18mL of ammonia water (25%~28%) to the mixture under stirring, and continue stirring for 12h. Centrifuge and wash sequentially with absolute ethanol and deionized water. Then dry in an oven at 80°C to obtain a pure white powder. Disperse 0.8g of pure white powder in 80mL of deionized water and ultrasonically disperse for 20min. Then 3 g of polyvinylpyrrolidone was added thereto, and magnetically stirred for 3 h at room temperature. Finally, the mixed solution was placed in a water bath at 30° C., and 40 mL (2.0 g / 100 mL) of NaOH solution was added thereto, stirred by magnetic force, and reacted for 1 h. The solution was centrifuged and washed successively with absolute ethanol and deionized water. That is, a white powder was obtained. Disperse 0.5 g of the above white powder in 40 mL of absolute ethanol, add 100 ...

Embodiment 2

[0030] Add 18 mL of tetraethyl orthosilicate into a mixed solvent composed of 260 mL of absolute ethanol and 99 mL of deionized water, and stir magnetically. Add 18mL of ammonia water (25%~28%) to the mixture under stirring, and continue stirring for 12h. Centrifuge and wash sequentially with absolute ethanol and deionized water. Then dry in an oven at 80°C to obtain a pure white powder. Disperse 0.4g of pure white powder in 40mL of deionized water and ultrasonically disperse for 20min. Then 6 g of polyvinylpyrrolidone was added thereto, and magnetically stirred for 3 h at room temperature. Finally, the mixed solution was placed in a water bath at 20°C, and 40 mL (2.0 g / 100 mL) of sodium borohydride solution was added thereto, stirred by magnetic force, and reacted for 1 h. The solution was centrifuged and washed successively with absolute ethanol and deionized water. That is, a white powder was obtained. Disperse 0.5 g of the above white powder in 40 mL of absolute ethan...

Embodiment 3

[0032]Add 18 mL of tetraethyl orthosilicate into a mixed solvent composed of 260 mL of absolute ethanol and 99 mL of deionized water, and stir magnetically. Add 18mL of ammonia water (25%~28%) to the mixture under stirring, and continue stirring for 12h. Centrifuge and wash sequentially with absolute ethanol and deionized water. Then dry in an oven at 80°C to obtain a pure white powder. Disperse 0.8g of pure white powder in 80mL of deionized water and ultrasonically disperse for 20min. Then 6 g of polyvinylpyrrolidone was added thereto, and magnetically stirred for 3 h at room temperature. Finally, the mixed solution was placed in a water bath at 60°C, and 40 mL (2.0 g / 100 mL) of NaOH solution was added thereto, stirred by magnetic force, and reacted for 1 h. The solution was centrifuged and washed successively with absolute ethanol and deionized water. That is, a white powder was obtained. Disperse 0.5 g of the above white powder in 40 mL of absolute ethanol, add 100 mL ...

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Abstract

The invention discloses a method for preparing silver-carried silica microsphere functional materials. Monodisperse uniform spherical composite metallic silver-carried silica functional particles are prepared by chemical etching and metal salt pyrolysis methods, the particles are formed by uniformly loading nanometer metallic silver with the grain diameter of 5-50nm on the monodisperse multihole silica particles used as inner cores, so that the original silica particles have the special properties of nanometer silver particles. The particle obtained by the method has high purity and good monodispersity, the size of a product can be controlled by reaction conditions, and the method has wide application prospects. The method for preparing the silver-carried silica microsphere functional materials disclosed by the invention has a simple process and is environment-friendly, raw materials and equipment are cheap and are easy to obtain, and the cost is low. The synthesis time is short, the efficient is high, and the method has great industrial production prospects.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and relates to a preparation method of a silver-loaded microsphere material, in particular to a preparation method of a silver-loaded silicon dioxide microsphere functional material. Background technique [0002] Due to its high surface activity and surface energy, nano-metallic silver has special properties such as antistatic, bactericidal and catalytic, and can be widely used in many fields such as catalyst materials and antibacterial materials. However, the silver powder prepared by the traditional chemical decomposition or reduction method generally has a large particle size, a wide distribution range, irregular particle shape, and is prone to agglomeration, which affects the special properties of nano-metal silver. Therefore, there are currently many reports in the literature on the preparation of nanoscale metallic silver using silicon dioxide as a carrier. Most of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02
Inventor 刘辉李广军朱振峰李军奇何选盟
Owner SHAANXI UNIV OF SCI & TECH
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