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Micromesohole silicon dioxide heterocompound and its preparation method and use

A silica, micro-mesoporous technology, applied in chemical instruments and methods, botanical equipment and methods, addition of inorganic compounds, etc., can solve the problems of large surface area and high photocatalytic activity, and achieve good dispersibility, high purity, Size controllable effect

Inactive Publication Date: 2003-12-03
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, TiO 2 Oxygen will be decomposed and reduced by ultraviolet radiation, which will cause changes in its own color, especially TiO below 100nm 2 Particles, due to their large surface area and high photocatalytic activity, are more likely to cause degradation of other organic additives

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Self-made microporous SiO with a particle size of about 170 nm 2 The particles were ultrasonically dispersed into absolute ethanol at a concentration of 2% by volume. In this mixed solution, add dropwise titanium tetrachloride and ethanol solution with a volume concentration ratio of 1:2, so that the molar ratio of silicon dioxide and titanium tetrachloride is 1:1.3, and the dropwise addition time is 20 minutes. 24 hours. Slowly add a certain amount of water, the molar ratio of water to titanium tetrachloride is 2:1. Obtain a white turbid solution, centrifuge, dry the obtained centrifuged product, and roast at 500°C to obtain micro-mesoporous silica particles with a particle size of 175 nanometers, about 2 nanometers in the interior of the micro-mesoporous silica particles and about 5 nanometers of titanium dioxide on the shallow surface. Mesoporous silica heterocomposites. Escherichia coli was used to test the antibacterial performance, and the antibacterial zone wa...

Embodiment 2

[0040] Self-made mesoporous SiO with a particle size of about 2000 nm 2 The particles were ultrasonically dispersed into water at a concentration of 15% by volume. Slowly add disodium hydrogen phosphate solution, the molar ratio of silicon dioxide: disodium hydrogen phosphate solution in the mixture is 1:0.05. Then add silver-ammonia complex (specific) solution, disodium hydrogen phosphate in the mixed solution: the mol ratio of silver ion is 1:1. The resulting mixture was separated, the precipitate was washed with distilled water, dried, pulverized, and calcined at 500°C to obtain a compound with a particle size of 2005 nm, which was compounded inside the micro-mesoporous silica particles of about 1 nm and on the shallow surface of about 5 nm. Microporous silica heterocomposites of nanosilver phosphate. Escherichia coli was used to test the antibacterial performance, and the antibacterial zone was 11mm.

Embodiment 3

[0042] Self-made mesoporous SiO with a particle size of about 2000 nm 2 The particles were ultrasonically dispersed into absolute ethanol at a volume concentration of 20%. In this mixed solution, add dropwise titanium tetrachloride and ethanol solution with a volume concentration ratio of 1:1, so that the molar ratio of silicon dioxide-titanium tetrachloride is 1:0.3, and the time for adding it is 20 minutes. 24.0 hours. Slowly add a certain amount of water, the molar ratio of water to titanium tetrachloride is 5:1. Obtain a white turbid solution, centrifuge, dry the centrifuged product, and roast at 500°C to obtain micro-mesoporous silica particles with a particle size of 20005 nanometers, composited with about 2 nanometers inside the micro-mesoporous silica particles and about 5 nanometers titanium dioxide on the shallow surface. Porous silica heterocomposites. Escherichia coli was used to test the antibacterial performance, and the antibacterial zone was 9mm.

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Abstract

An antibacterial composition for paint, ceramics, rubber, plastics, etc. is composed of microporous or mesoporous SiO2 particles as carrier and silver phosphate and / or TiO2 as active components which are compounded on the surface of the said SiO2 particle. Its advantages are high antibacterial effect, high hydrophilicity and low cost.

Description

technical field [0001] The invention belongs to the field of micro-mesoporous silica carrier antimicrobial materials and their application in antibacterial products, in particular to silicon dioxide composite silver and / or titanium dioxide with micropores and mesoporous pores ranging from tens of nanometers to tens of microns The compound and its preparation method and use. Background technique [0002] Bacteria and pathogenic microorganisms are one of the main killers of human health. The development and application of antibacterial materials are of great significance to protect human health and reduce diseases. The core component of antibacterial materials is antibacterial agent, which is a chemical composition that is highly sensitive to microorganisms such as bacteria and molds. According to the different active ingredients of antibacterial agents, they can be divided into silver series (including Ag + , Cu 2+ , Zn 2+ and other metal ions) and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/08C08K3/36C09C3/06C09D1/00D21H17/63
Inventor 唐芳琼孟宪伟
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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